JP2001035413A - Deflection yoke device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke device capable of correcting the raster distortion certainly using a simple configuration and of simplifying the process of adjustment. SOLUTION: Permanent magnets 19 are installed at the top and bottom of the periphery of a major diameteric part 11 of a funnel-shaped spacer 13, and a magnetic substance 21 is installed on that side face of each permanent magnet 19 located on the side with the CRT cone part in such a way as interposed, and thereby the raster distortion is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device suitable for use in a color cathode ray tube used for a display device such as a color television receiver or a color terminal display, and more particularly to a raster distortion device. The present invention relates to a deflection yoke device capable of correcting the deflection.

[0002]

2. Description of the Related Art Color cathode ray tubes are frequently used in display devices such as color television receivers and color terminal display devices because of their large size, high definition, ease of use, and price. ing. In addition, in these cathode ray tubes, a flat face in which the face surface of the cathode ray tube is flattened is used.
The cathode ray tube has been adopted, and is now taking the mainstream position. In addition, these display devices are required to have higher quality and higher definition. In particular, the performance of color convergence (convergence) found on a screen of a cathode ray tube and the performance of screen raster distortion are regarded as important. Is coming. However, in flat face type cathode ray tubes, color shift and raster distortion appear more remarkably than in conventional cathode ray tubes, and therefore, improvement is particularly demanded.

In a color television receiver or a color terminal display device to which these demands have been sent, correction of color misregistration is performed by using windings of a horizontal deflection coil and a vertical deflection coil in a deflection yoke device. Improvements are made in the design of the distribution, the so-called magnetic field distribution. To improve the color shift, the magnetic field distribution of the horizontal deflection coil is designed to generate a pincushion magnetic field, and the magnetic field distribution of the vertical deflection coil is designed to be a barrel magnetic field. Is being improved.

In the correction of raster distortion, it is generally used to electrically correct left and right pincushion distortions among the raster distortions by providing a left and right pincushion distortion correction circuit or the like. As for the upper and lower pincushion distortion, the current situation is to improve the design of the magnetic field distribution as much as possible.

However, there is a limit in design-correcting the upper and lower pincushion distortion using only the magnetic field distribution. Therefore, in addition to the magnetic field distribution of the deflection coil itself, a permanent magnet is added to the deflection coil to reduce the magnetic field distribution. By changing them, the upper and lower raster distortions are corrected.

FIG. 7 is a perspective view showing a conventional deflection yoke device which corrects upper and lower pincushion distortion by using such a permanent magnet together. The conventional deflection yoke apparatus will be described with reference to FIG. 7. A large-diameter portion 101 located on the cathode side of a cathode ray tube (not shown) made of synthetic resin such as polypropylene, and an electron beam of the cathode ray tube are used. A spacer 103 is formed in a funnel shape so as to have a small diameter portion 102 located on the gun side. Inside the spacer 103, a pair of saddle-shaped horizontal deflection coils 104 are arranged vertically facing each other, and outside the spacer 103, a pair of saddle-shaped The vertical deflection coils 105 are arranged to face left and right. A cylindrical core 106 made of ferrite or the like is mounted so as to cover the outer periphery of the middle part of the vertical deflection coil 105, and a terminal plate 107 is mounted near the small diameter portion 102 of the spacer 103. .

On the other hand, in the vertical direction of the periphery of the large-diameter portion 101 of the spacer 103, a frame-shaped permanent magnet holding portion 108 projecting outwardly has a space in a direction orthogonal to the axial direction of the horizontal deflection coil 104. It is formed integrally with the support 103. The permanent magnet holder 108 includes, for example, the upper permanent magnet holder 1.
At 08, a permanent magnet 109 magnetized in a rod shape is attached so that the south pole is located on the left side and the north pole is located on the right side when viewed from the large diameter portion 101 side of the spacer 103. A deflection yoke device is configured by attaching a rod-shaped permanent magnet 109 to the permanent magnet holding unit 108 such that the north pole is on the left side and the south pole is on the right in the direction opposite to the upper permanent magnet 109. I have.

According to the deflection yoke device thus constructed, the electron beam of the cathode ray tube is deflected to the left and right by the pair of horizontal deflection coils 104, and the electron beam is deflected by the pair of vertical deflection coils 105. Is deflected in the vertical direction to display a predetermined raster on the cathode ray tube screen. When pincushion distortion occurs in the vertical direction on this raster, the correction is performed using the permanent magnet 109. As shown in FIG. 8, the permanent magnet 109 generates magnetic lines of force from the N pole to the S pole of the permanent magnet 109, and the magnetic force acts so as to act most strongly at the lower center of the permanent magnet 109. Therefore, the electron beams R, G, and C of the cathode ray tube 110 shown in a simplified manner in FIG.
If the magnetic force necessary to correct raster distortion is added to B,
Assuming that pincushion distortion as shown by a broken line in FIG. 9 has occurred, if the magnetic force of the permanent magnet 109 is applied in the direction in which the electronic beam is pulled, the upper and lower pincushion distortions are corrected as shown by the solid line in FIG. is there.

However, in the case of a relatively simple pincushion distortion as shown in FIG. 9 which is vertically symmetrical and whose central portion is shrunk, the pincushion distortion can be corrected relatively easily by disposing the permanent magnets 109 above and below. However, when pincushion distortion of a complicated shape, which is asymmetrical in the vertical direction as shown in FIG. It is difficult to perform correction only by disposing the permanent magnet 109, and it is necessary to further correct the permanent magnet 109 for correction in accordance with the situation of pincushion distortion. In addition to this, the correction work becomes complicated.

Attempts have been made to improve such a point even a little. For example, Japanese Patent Application Laid-Open No. Hei 8-250041 discloses an example. In the deflection yoke device described in this publication, a pair of holding portions are provided so as to face each other in the vertical direction on the large-diameter side of the coil separator, and the holding portions hold permanent magnets. A deflection yoke device is formed by forming a projection and holding the ferromagnetic material movably on the projection so that the projection protrudes toward the cone of the cathode ray tube beyond the permanent magnet. ing. Then, by moving this ferromagnetic material within the range of the protrusion, the intensity of the magnetic force line generated from the permanent magnet is adjusted,
The upper and lower pincushion distortions are corrected for improvement.

[0011]

In such a deflection yoke device, it is considered that the upper and lower pincushion distortion can be improved. Since the ferromagnetic material is arranged close to the N and S poles of the ferromagnetic material, the lines of magnetic force generated from the permanent magnet are made equivalent to those generated from the ferromagnetic material. By adjusting the position, it can be considered that the magnetic field lines themselves are changed. For this reason, it is presumed that considerable skill and difficulty are required to correct the magnetic field lines that affect the entire raster in the vertical direction only by moving the ferromagnetic material positioned at both ends of the permanent magnet. The structure for adjusting and holding the ferromagnetic material is also complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a relatively simple structure, but can more easily and surely improve raster distortion in the vertical direction. -To provide a locking device.

[0013]

According to the present invention, there is provided a pair of horizontal deflection coils disposed inside a cylindrical core, and a pair of vertical deflection coils separately disposed via the horizontal deflection coil and a separator. And at least one permanent magnet disposed in the vertical direction on the cathode ray tube cone portion side of these coils in a deflection yoke apparatus interposed between the permanent magnet and the cathode ray tube cone portion. This is a deflection yoke device characterized by arranging a magnetic material as described above.

[0014] Further, in the deflection yoke apparatus, the magnetic body is movable along the surface of the permanent magnet between the permanent magnet and the cathode ray tube cone.

Further, the separator is a deflection yoke device characterized by holding a permanent magnet and a magnetic material in the vertical direction of the cathode ray tube cone side opening end.

[0016]

Next, an embodiment of the present invention will be described. FIG. 1 is a perspective view showing a deflection yoke apparatus according to the present invention. The deflection yoke apparatus is made of synthetic resin such as polypropylene, and has a large-diameter portion 11 located on a cone side of a cathode ray tube (not shown) and a cathode ray tube. A spacer 13 is formed in a funnel shape so as to have a small diameter portion 12 located on the electron gun side. This spacer 13
A pair of horizontal deflection coils 14 for generating a pincushion magnetic field, which are formed in a saddle shape, are disposed vertically opposite to each other, and a barrel also formed in a saddle shape is formed outside the spacer 13. A pair of vertical deflection coils 15 for generating a magnetic field
Are arranged to face left and right. A cylindrical core 16 made of ferrite or the like is mounted so as to cover the outer periphery of the middle portion of the vertical deflection coil 15, and a terminal plate 17 is mounted near the small diameter portion 12 of the spacer 13. .

On the other hand, in the vertical direction of the periphery of the large diameter portion 11 of the spacer 13, a frame-shaped permanent magnet
Are formed integrally with the spacer 13 in a direction perpendicular to the axial direction of the horizontal deflection coil 14. The permanent magnet holding portion 18 has, for example, a rod-like shape on the upper permanent magnet holding portion 18 so that the S pole is located on the left side and the N pole is located on the right side when viewed from the large diameter portion 11 side of the spacer 13. A permanent magnet 19 formed by magnetizing is mounted on the lower permanent magnet holding portion 18 so that an N pole is located on the left side in the opposite direction to the upper permanent magnet 19 and an S pole is located on the right side. A permanent magnet 19 is mounted.
The lines of magnetic force generated by the permanent magnets 19 generate a magnetic force in a direction to attract the electron beam.

The permanent magnet holding portion 18 has a space 13 on the open end side of the large-diameter portion 11 of the spacer 13, that is, a space on the cathode ray tube cone side.
In the connection portion with the support 13, a locking groove 20 for locking the magnetic body is provided in the longitudinal direction of the permanent magnet holding portion 18.
The locking groove 20 has an L-shaped magnetic body 21 formed therein.
Is inserted into the locking groove 20 as shown by the arrow in the figure, is press-fitted and held in a movable state, and is locked at a predetermined position as shown in FIG. 2, for example, to constitute a deflection yoke device. Is done.

In the state shown in FIG. 2, when the magnetic body 21 is locked, as shown in FIG. 3, the lines of magnetic force generated by the permanent magnet 19 are generated from the N pole to the S pole. Since the magnetic body 21 is arranged on the cone side of the extreme S portion, the magnetic field lines from the permanent magnet 19 are deformed so as to pass through the magnetic body 21 side, and the magnetic field lines affect the electron beam 22. Is reduced.

Now, a raster as shown by a solid line in FIG.
When it is assumed that distortion occurs, the magnetic lines of force generated from the permanent magnet 19 are biased toward the magnetic body 21 by disposing the magnetic body 21 at the position shown in FIG. The intensity of the magnetic field with respect to the electron beam 22 that scans the middle part is relatively weaker than the other parts, and as a result, as shown by the broken line in FIG. A modified raster can be obtained on the cathode ray tube screen.

Since the generated raster distortion is not invariable and uniform, the magnetic body 21 is moved along the locking groove 20 to the optimum correction position in accordance with the state of the raster distortion. Then, the adjustment may be performed, and then the magnetic body 21 may be fixed to the permanent magnet holding portion 18 with an adhesive or the like. Of course, the position can be secured by the magnetic body 21 itself after adjusting the raster distortion by means such as providing a locking claw or a serrated projection on the magnetic body 21 or press-fitting into the locking groove 20. If it is, there is no need to specially fix it.

FIG. 5 shows that a finer adjustment is possible.
This shows an example in which the magnetic body 21 is divided into a plurality and arranged.
For example, when the first magnetic body 21a and the second magnetic body 21b are configured, in the first rough adjustment, whether the first and second magnetic bodies 21a and 21b are integrated with each other. In this way, by handling them integrally and moving them simultaneously to a position where raster distortion can be corrected, and then finely adjusting the positions of the first and second magnetic bodies 21a and 21b, finer adjustment is possible. . It goes without saying that the number of the magnetic bodies 21 can be changed according to the design or the state of the distortion.

The configuration shown in FIG. 6 shows an example in which the mounting state of the magnetic body 21 is more reliable.
Is not formed into a simple L-shape, but is formed into a U-shape so as to enclose the permanent magnet holding portion 18 and further formed with a bent portion 23. As well as ensuring the retention of body 21,
The magnetic body 21 can be moved not only from the direction of the large diameter portion 11 of the support 13 but also from the outer peripheral direction. The adjustment of the magnetic body 21 can be easily performed, for example, by adjusting the position of the magnetic body 21 and then fixing the magnetic body 21.

The present invention is not limited to the embodiment described above. For example, the magnetic body 21 shown in FIG.
As shown in FIG. 5, it is possible to adopt a configuration of a plurality of magnetic bodies 21, or the case where the permanent magnets 19 and the magnetic bodies 21 are arranged at both the upper and lower ends of the spacer 13 in the vertical direction has been described. If only one correction is sufficient, either one of the permanent magnets 19 and the magnetic body 21 can be omitted, and the strength of the magnetic force of the permanent magnets 19 does not need to be equal in the upper and lower directions. For example, the permanent magnet 19 can be used by changing its length or size, or by changing the size or quantity of the magnetic material 21 or omitting only the magnetic material 21 on one side.

Further, the case where the vertical deflection coil 15 is constituted by a saddle type deflection coil has been described. However, the vertical deflection coil 15 may be constituted by a toroidal type vertical deflection coil formed by winding a coil around a core 16. The application and the modification of are considered.

[0026]

As described above, according to the present invention, in spite of the relatively simple structure, not only the raster distortion can be easily and reliably corrected, but also the adjustment work is simple. To provide a deflection yoke device exhibiting excellent effects such as being able to partially adjust the magnetic field due to the lines of magnetic force generated from the permanent magnets. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a deflection yoke device according to the present invention.

FIG. 2 is a perspective view showing an example of a main part of a deflection yoke device according to the present invention.

FIG. 3 is an explanatory diagram showing a relationship between magnetic lines of force between a permanent magnet and a magnetic body shown in FIG. 2;

FIG. 4 is a raster explanatory diagram showing a correction state of raster distortion using the deflection yoke apparatus of the present invention.

FIG. 5 is an enlarged perspective view of a main part showing another example of the deflection yoke device according to the present invention.

FIG. 6 is an enlarged perspective view of a main part showing still another example of the deflection yoke device according to the present invention.

FIG. 7 is a perspective view showing a conventional deflection yoke device.

FIG. 8 is an explanatory diagram for explaining magnetic lines of force of a permanent magnet in a conventional deflection yoke device.

FIG. 9 is an explanatory view showing a raster having a general upper and lower pincushion distortion.

FIG. 10 is an explanatory diagram showing a raster having a special form—a raster having distortion.

[Explanation of symbols]

 13: Spacer 14: Horizontal deflection coil 15: Vertical deflection coil 16: Core 19: Permanent magnet 21: Magnetic material

Claims (3)

[Claims] 1. A pair of horizontal deflection coils disposed inside a cylindrical core, a pair of vertical deflection coils separated from the horizontal deflection coil via a separator, and a cathode ray tube core of these coils. In a deflection yoke apparatus having at least one permanent magnet disposed in the vertical direction on the cathode side, a magnetic material is disposed so as to be interposed between the permanent magnet and the cathode ray tube cone. A deflection yoke device characterized by the above-mentioned. 2. A deflection yoke apparatus according to claim 1, wherein said magnetic body is movable along the surface of said permanent magnet between said permanent magnet and a cathode ray tube cone. . 3. The deflection yoke according to claim 1, wherein the separator holds the permanent magnet and the magnetic material in a vertical direction of an opening end on a cathode ray tube cone side. apparatus.