JPH02204947A - In-line type color deflection yoke device - Google Patents

Abstract

PURPOSE:To make correction of an upper and a lower thread winding distortion without ill influencing the middle part of a TV screen by furnishing No.1 correction magnets in the upper and lower positions of a deflection yoke on its funnel side, and installing No.2 correcting magnets in the diagonal upper and lower positions nearer the central Y-axis than the diagonal. CONSTITUTION:A pair of No.1 correcting magnets 7a, 7b consisting of permanent magnet are arranged fast on the upper and lower sides of a deflection yoke 1 at its large dia. portion, i.e. on the funnel side of deflection yoke 1, by means of adhesion or any other appropriate means, and an upper pair and a lower pair of No.2 correcting magnets 8a, 8b, 8c, 8d consisting of permanent magnet are installed in the upper and lower position nearer the central Y-axis than the diagonals 2a, 2b of the deflection yoke 1 by means of alike adhesion or any other appropriate means. Consequently the upper and lower thread winding distortions on the raster pattern are corrected into perfectly straight distortion with corrective action of the No.1 correcting magnets 7a, 7b and No.2 correcting magnets 8a-8d, and at the same time, seagull distortion can be corrected effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an in-line color deflection yoke device equipped with means for correcting pincushion distortion appearing above and below the screen of a cathode ray tube.

[Conventional technology]

In-line cathode ray tubes used in color television receivers and color display devices have a blue B electron gun Ga, a green G electron gun C6, and a red R electron gun when viewed from the screen (hereinafter referred to as the TV screen) side. The gun GR is arranged on the X-axis from left to right, and an in-line color deflection yoke device for raster scanning the blue B, green G, and red R beams is mounted on the cathode ray tube.

As is well known, this type of in-line collar deflection yoke device includes a bobbin, a core, a horizontal deflection coil that generates a horizontal deflection magnetic field, and a vertical deflection coil that generates a vertical deflection magnetic field. By driving this deflection yoke device, a Lasque pattern is formed on the television screen.

Generally, a raster pattern obtained on a television screen has pincushion distortion on the top, bottom, left and right sides of the screen, as shown in FIG. 6, and this causes distortion of the image on the television screen.

In recent years, improvements have been made to deflection yoke devices to eliminate image distortion caused by pincushion distortion, and in-line color deflection yokes equipped with means for correcting this type of pincushion distortion have been developed. As a device, JP-A-53-1
No. 48230 is known. The device in this publication is
The winding form of the horizontal deflection coil is adjusted so that the horizontal deflection magnetic field becomes as much as possible in the binction type, and the pincushion distortion on the upper and lower sides of the raster scan is made almost linear, and the remaining pincushion distortion on the side side is reduced as shown in Figure 7. Due to the magnetic fields of permanent magnets 3a, 3b, 3c, and 3d arranged closer to the X-axis than the diagonal axes 2a and 2b on the funnel side of the deflection yoke l, and the magnetic fields of permanent magnets 5a and 5b arranged oppositely on the X-axis. This is to correct the pincushion distortion on the side by drawing it outward.

[Problem to be solved by the invention]

However, in the conventional device described above, the correction of pincushion distortion above and below the raster pattern is performed by adjusting the winding form of the horizontal deflection coil. There was a problem in that it was difficult to correct for the distortion.

In addition, since pincushion distortion on the side side is corrected by pulling it horizontally outward using a permanent magnet, it is applied to the middle part of the TV screen, especially to the middle part S1 point (Fig. 4) at the left and right edges of the TV screen. This has a large effect, and there is a disadvantage that the amount of misconvergence reversal (misconvergence in which the direction of color shift between red R and blue B is different from the direction of color shift at other locations) at these 53 points becomes large.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to easily convert pincushion distortion in the upper and lower portions of a raster pattern into linear distortion without requiring troublesome shape adjustment of horizontal deflection coils. An object of the present invention is to provide an in-line type color deflection yoke device which can correct the above-mentioned upper and lower pincushion distortion without adversely affecting the middle part of the television screen, especially the S1 point.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, in the present invention, a pair of first correction magnets are provided at upper and lower positions on the funnel side of the in-line color deflection yoke to linearly correct vertical pincushion distortion in the central part of the screen of the cathode ray tube, and At least four second correction magnets are provided at diagonal upper and lower positions closer to the center Y-axis than the diagonal axis on the funnel side to linearly correct vertical pincushion distortion in the diagonal periphery of the screen of the cathode ray tube. It is structured with the following characteristics:

[Effect]

In the present invention configured as described above, the raster at the upper end of the television screen is drawn upward by the magnetic field of the first correction magnet in the central part of the screen, and the raster at the peripheral part at the upper end of the television screen is drawn upward by the magnetic field of the first correction magnet. is drawn downward by the magnetic field of the second correction magnet placed above, and as a result, the pincushion distortion on the upper side of the television screen is corrected into a linear distortion pattern. Similarly, the raster at the bottom edge of the TV screen is drawn downward in the center of the screen by the magnetic field of the first correction magnet placed at the bottom, and the raster at the left and right periphery of the screen is drawn downward. As a result of being drawn upward by the magnetic field of the second correction magnet, the pincushion distortion at the bottom of the television screen is similarly corrected to a linear distortion pattern.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1 and 2 show an embodiment of an in-line color deflection yoke device according to the present invention. In the in-line type collar deflection yoke l in this embodiment, a hollow-shaped horizontal deflection coil (not shown) is wound along the inner peripheral surface of the bobbin 4, and a core (not shown) is wound around the outer peripheral surface of the bobbin 4. A vertical deflection coil 6 is wound around this core in a toroidal manner.

A characteristic feature of this embodiment is that a pair of first correction magnets 7a made of permanent magnets are provided on the funnel side of the deflection yoke 1, that is, on the upper and lower sides of the enlarged diameter portion (head) of the deflection yoke 1.
, 7b are fixedly arranged by adhesive or other appropriate means, and two pairs of permanent magnets, that is, four permanent magnets are placed at upper and lower positions closer to the center Y axis than the diagonal axes W2a and 2b of the deflection yoke 1. The second correction magnets 8a, 8b, 8c, and 8d are similarly fixedly arranged by adhesive or other appropriate means. A first correction magnet 7a arranged above the deflection yoke l
When viewed from the TV screen, the left side is magnetized to the S pole and the right side is magnetized to the N pole. Further, the second correction magnet 8a disposed on the left side of the first correction magnet 7a is magnetized to have an N pole on the left side and an S pole on the right side. The second correction magnet 8b disposed in is magnetized to have an N pole on the left side and an S pole on the right side. On the other hand, the deflection yoke l
The first correction magnet 7b placed on the lower side has a polarity opposite to that of the first correction magnet 7a on the upper side.

That is, when viewed from the TV screen side, the left side is magnetized to the N pole, and the right side is magnetized to the S pole. Further, the second correction magnet 8c disposed on the left side of the first correction magnet 7b is magnetized to have an S pole on the left side and an N pole on the right side.
A second correction magnet 8d disposed on the right side of the correction magnet 7b.
The left side is magnetized to the S pole, and the right side is magnetized to the N pole. Note that the diagonal axes 2a and 2b correspond to diagonal lines 2a and 2b diagonally connecting the four corners of the television screen (FIG. 4).

In this embodiment configured as described above, a magnetic field is generated in the first correction magnets 7a, 7b and the second correction magnets 8a to 8d from the north pole to the south pole. , a rightward force F acts on the raster. Therefore, as shown in FIG. 3, on the upper side of the raster pattern, the central part (downward curved part) of the upper pincushion distortion is drawn upward by the magnetic field of the first correction magnet 7a, and the second By the magnetic fields of the correction magnets 8a and 8b, the peripheral portions of both ends (the upwardly protruding portions) of the upper pincushion distortion are drawn downward. Due to the attraction of these magnetic fields,
As a result of the upper pincushion distortion moving in the direction of the arrow of the force, the upper pincushion distortion is corrected to a linear distortion, as shown by the chain line.

Similarly, the pincushion distortion on the lower side of the raster pattern is caused by the center portion being drawn downward by the magnetic field of the first correction magnet 7b, and the peripheral portion being drawn upward by the magnetic field of the second correction magnets 8c and 8d. As a result, the pincushion distortion on the lower side is corrected to linear distortion, as shown by the chain line in the figure. As described above, in this embodiment, the pincushion distortion above and below the raster pattern is corrected to a completely linear distortion by the correction action of the first correction magnets 7a, 7b and the second correction magnets 8a to 8d. The advantage is that Seagull distortion can also be effectively corrected. Furthermore, when correcting the vertical pincushion distortion, the magnetic fields of the second correction magnets 8a to 8d act locally around the four corners at both ends of the television screen, as shown by diagonal lines in FIG. The influence of the magnetic field of the second correction magnets 8a to 8d does not affect the middle part of the TV screen, especially the S1 point, so the amount of reversal of misconvergence at the S1 point does not increase and deteriorate. .

Further, in this embodiment, as described above, the second correction magnet 88
The raster is moved inward by a magnetic field of ~8d (center X-axis direction)
However, in this case, in Figure 5, on the left side of the TV screen, the blue B beam emitted from the electron gun G, which is closer, is stronger than the red R beam emitted from the farthest electron gun G, on the left side of the TV screen. Since the blue B beam has high sensitivity, the amount of attraction of the blue B beam, which has high sensitivity, is greater than that of the red R beam. Similarly, on the right side of the TV screen,
The left R beam has higher sensitivity than the blue B beam (because the red R beam has a larger inward pull than the blue B beam). It is possible to correct the reverse cross misconvergence (cross misconvergence in which the beam from the farthest electron gun deviates inward from the beam from the nearest electron gun) as shown in FIG. 5.

As mentioned above, in the device of this embodiment, the pincushion distortion at the top and bottom of the television screen is corrected to linear distortion, but during this correction, the correction magnetic field does not affect the central part of the television screen. Even if misconvergence occurs in the center of the television screen and is corrected by a separate misconvergence correction circuit, the magnetic fields of the correction magnets 7a, 7b, 8a to 8d interfere with the magnetic field of the misconvergence correction circuit. Therefore, it is possible to easily correct misconvergence at the center of the television screen.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various ways.

For example, in the above embodiment, the first correction magnet 7a.

7b and the second correction magnets 8a to 8d are made of permanent magnets, but they may be made of electromagnets.

Further, in the above embodiment, the second correction magnets 8a to 8d are composed of four permanent magnets, but the second correction magnets are composed of an even number of six or more permanent magnets, and the raster pattern pincushion The distortion may be corrected more precisely.

Furthermore, although the collar deflection yoke device of the above embodiment uses a saddle-shaped horizontal deflection coil and a toroidally wound vertical deflection coil, the form of the deflection coil of these collar deflection yoke devices is not particularly limited. , the vertical deflection coil may be a hollow-shaped coil.

〔Effect of the invention〕

In the present invention, first correction magnets are provided at upper and lower positions on the funnel side of the deflection yoke, and second correction magnets are provided at upper and lower diagonal positions closer to the center Y axis than the diagonal axis.
The central part of the pincushion distortion is linearly corrected by the magnetic field of the first correction magnet, and the peripheral parts of the upper and lower ends of the pincushion distortion are corrected linearly by the magnetic field of the second correction magnet. The magnetic fields of the first correction magnet and the second correction magnet make it possible to correct almost perfect linear distortion. In addition, when correcting this vertical pincushion distortion, since the second correction magnet is placed near the diagonal axis and near the center Y axis, the magnetic field of this second correction magnet is applied to the middle part of the TV screen,
In particular, it does not act on the S1 point, and as a result, an excellent effect can be obtained in that the vertical pincushion distortion can be corrected without adversely affecting the middle portion of the television screen.

[Brief explanation of the drawing]

Fig. 1 is a front configuration diagram showing an embodiment of an in-line color deflection yoke device according to the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 shows the correction effect for vertical pincushion distortion in this embodiment. FIG. 4 is an explanatory diagram showing the local correction area of the second correction magnet in this embodiment. FIG. This figure is a pattern diagram of pincushion distortion, and FIG. 7 is a schematic diagram of a deflection yoke equipped with a conventional side pincushion distortion correction means. l...Deflection yoke, 2a, 2b...Diagonal axis, 3a
. 3 b, 3 c, 3 d - permanent magnet, 4...
Bobbin, 5a. 5b... Permanent magnet, 6... Vertical deflection coil, 7a,
7b--First correction magnet, 8a, 8b, 8c, 8d-
Second correction magnet. Figure 1 Figure 2

Claims (1)

[Claims] A pair of first correction magnets are provided at the upper and lower positions on the funnel side of the inline type color deflection yoke to linearly correct the vertical pincushion distortion in the central part of the screen of the cathode ray tube. At least four second correction magnets are provided at diagonal upper and lower positions closer to the center Y-axis than the center Y-axis to linearly correct vertical pincushion distortion at the diagonal periphery of the screen of the cathode ray tube. Yoke device.