JPS62291844A - Deflection yoke - Google Patents

Abstract

PURPOSE:To make it possible to correct the local deflection distortion of a non-spherical cathode-tube by arranging a magnet near the horizontal and vertical axes on the deflection yoke picture side. CONSTITUTION:The first magnet 5 is arranged near the horizontal axis 11 of a deflection yoke 1 so that polarity in the N-S direction may be in parallel with the axis 11 while arranging the second magnet 5 near the vertical axis 12 so that the polarity in the N-S direction may be in parallel with the axis 12. Further, the first magnet body 6 is arranged on the side of the axis 11 of the first magnet 5 having a fixed interval d1 while arranging the second magnet body 6 on the side of the axis 12 of the second magnet 5 respectively having a fixed interval d2. Thereby, a magnetic line of force going from one magnet to the other magnet is formed to correct local deflection distortion while concentrating the magnetic line of force increasing deflection distortion on the arranged magnet body 6 to reduce a working magnetic field except a place to be corrected thus being able to form a correction magnetic field on the local deflection distortion part on the picture of a non-spherical surface cathode-ray tube with good efficiency.

Description

[Detailed Description of the Invention] & Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a deflection yoke that is used by being attached to a cathode ray tube. The present invention relates to a deflection yoke suitable for correcting local deflection distortion that occurs.

[Conventional technology]

Examples of correcting pincushion distortion or misconvergence using magnets in conventional deflection yokes include Japanese Patent Laid-Open No. 54-84919 and Japanese Patent Publication No. 55-852. Publication No. 58-7965 Special Publication No. 58-32
There are publications such as No. 892.

In these examples, in Japanese Patent Laid-Open No. 54-84919 and Japanese Patent Publication No. 55-852, magnets are arranged around the deflection yoke, mainly on the horizontal axis.

This system uses lines of magnetic force generated on the vertical axis to correct deflection distortion (pincushion distortion) that occurs near the outer frame of the screen. No consideration was given to correction of local deflection distortion at the corresponding raster position) and near both left and right edges of the screen.

Furthermore, in Japanese Utility Model Publication No. 58-7965, in order to correct misconvergence, magnets are arranged in the diagonal direction of the deflection yoke, and no consideration was given to correcting the above-mentioned local deflection distortion. .

Furthermore, in Japanese Patent Publication No. 58-52892, in order to correct raster distortion at the upper and lower ends of one screen and raster distortion at the middle part,
Magnets were arranged with opposite polarities on the screen side end of the deflection yoke and on the inside of the deflection yoke, and as with the above-mentioned sides, no consideration was given to correcting local deflection distortion. 0 [Problems to be Solved by the Invention] The above-mentioned prior art does not give any consideration to the correction of local deflection distortion that occurs on the aspherical cathode ray tube screen with wide-angle deflection, and therefore, the problem mainly occurs outside the screen rask. There was a problem in that there was only a correction function for the deflection distortion of the frame or the deflection distortion in the intermediate part. The object of the present invention is to provide a deflection yoke that corrects local deflection distortion, which is a unique phenomenon that occurs on a spherical cathode ray tube screen.

[Means for solving problems]

In order to achieve the above object, the present invention provides a first magnet located near the horizontal axis of the deflection yoke at the opening end of the deflection yoke on the screen side or at the rear side of the transition portion of the deflection coil. is arranged so that it is parallel to the horizontal axis, and
A second magnet is arranged near the vertical axis so that its polarity is parallel to the vertical axis, and a first magnetic body is arranged at a certain distance from the first magnet on the horizontal axis side of the first magnet. , and the second magnet is placed on the vertical axis side of the second magnet.
The feature is that the second magnetic body is arranged at a constant distance from the magnet.

[Effect]

The deflection yoke of the present invention is on the screen side of the deflection yoke,
By arranging the magnets near the horizontal and vertical axes, lines of magnetic force directed from one magnet to the other can be formed without greatly divergent, thereby correcting local deflection distortion and By arranging magnetic bodies on the horizontal and vertical axes of the screen, lines of magnetic force that increase the deflection distortion (pincushion distortion) of the outer frame of the screen rask, which diverges on the horizontal and vertical axes, are concentrated on the magnetic bodies and It is possible to reduce the magnetic field that acts on areas other than the correction area, and to efficiently form a correction magnetic field in the area where local deflection distortion occurs on the aspherical cathode ray tube screen.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view of a deflection yaw according to an embodiment of the present invention, and FIG. 2 is a perspective view of the deflection yoke viewed from the rear electron gun side.

In FIG. 1.2, the first magnet 5 is arranged near the horizontal axis 11 of the deflection yoke 1 so that the polarity in the N-9 direction is parallel to the horizontal axis, and the first magnet 5 is arranged near the vertical axis 12. The second magnet 5 is arranged so that the polarity in the N-S direction is parallel to the vertical axis, and a certain distance d is provided between the first magnet 5 and the first magnet on the horizontal axis 11 side. The first magnetic body 6 is disposed at the vertical axis 12 side of the second magnet 5, and the second magnetic body 6 is disposed at a constant distance d2 from the second magnet.

The operation of the above embodiment will be briefly explained in comparison with the conventional example.

〔Example〕

FIG. 5 shows an example of local deflection distortion 9 that occurs on the aspheric Brachun tube screen 10 with wide angle deflection.

Especially in the 29 type, which is close to a flat face with a 110 degree wide angle deflection, it is bomb resistant.

There is a trend to change the curvature at the periphery of one screen in order to ensure doming performance, etc., and aspheric screens have come to be used.

In such an aspherical cathode ray tube, as shown in FIG. 5, local deflection distortion 9 occurs at locations where the screen curvature changes. Moreover, since it is a local deflection distortion 9 of the screen, unlike the conventional pincushion distortion correction circuit,
In a circuit that flows a parabolic waveform correction current, it is difficult to completely correct the local deflection distortion 9 because it differs from a quadratic curve.

FIG. 6 shows an example of a deflection yoke 1 equipped with a magnet 5 as described in the above-mentioned Japanese Utility Model Publication No. 54-84919. When the magnet 5 is attached diagonally to the deflection yoke 10, the magnetic field 7 is formed by bending around the magnet 5.

For this reason, a deflection force 8 as shown in the figure acts toward the magnet 5, and the raster on the screen requires correction as shown in Figure 5, as shown by the broken line in Figure 6. Although the local deflection distortion 9 is in the direction of correction, deflection distortion 9 that bends in the direction of the magnet 5 is formed in other places, and along with this, deflection distortion (pincushion distortion) at the left and right edges of the screen is also created. (increasing the number of cases) resulting in aggravation of single-screen syndrome.

Apart from this, as in the case of FIG. 6, as a method of forming a magnetic field necessary for correcting the local deflection distortion 9, as shown in FIG. Consider an example in which the magnet 5 is arranged so that its polarity is parallel to the horizontal axis.

When the magnets 5 are arranged as shown in Fig. 7, the local deflection distortion 9 that needs to be corrected is in the direction of correction, as shown by the broken line in the figure. Also in point 7M, deflection distortion results. especially,
Deflection distortion 9 as shown in the figure is likely to occur in the upper and lower parts of the screen where the abrasive force @7 diverges.

Therefore, as an example to improve this, as shown in FIG.
A first magnet 5 is arranged near the horizontal axis 11 of N-3 so that the polarity of N-3 is parallel to the horizontal axis 11, and a second magnet 5 is arranged near the vertical axis 12 so that the polarity of N-3 is parallel to the horizontal axis 11. 1
It is arranged so that it is parallel to 2.

With this configuration, lines of magnetic force from one magnet 5 toward the other magnet 5 are formed without greatly divergent. As a result, as shown in FIG. 9, the local deflection distortion 9 on the cathode ray tube screen is corrected, but as shown in FIG. Due to the action of the deflection force 8 shown in FIG. 9, deflection distortion (pincushion distortion) tends to occur in the outer frame of the screen shown in FIG.

Therefore, the present invention has the structure of the embodiment shown in FIG. 1.2, and its operation will be explained with reference to FIG. 3 showing the main parts. As shown in FIG. 3, among the lines of magnetic force 7 generated by the magnet 5, this is a magnetic field that increases the deflection distortion (pincushion distortion) of the outer frame of the screen, which is generated on the horizontal axis 11 and vertical axis 12 sides.
A magnetic field that is not involved in the correction of the local deflection distortion 9 is guided to the magnetic body B, and the above magnetic field generated inside the deflection yoke 1 is reduced, so that the local deflection distortion 9 is reduced as shown in FIG. A correction magnetic field from the magnet 5 is applied to the generated portion. As a result, the shape of the screen raster 14, as shown in FIG. 4, can correct the trapping and local deflection distortion 9 without significantly affecting the deflection distortion of the outer frame of the screen, resulting in an attractive screen. be able to.

Next, the correction effect of the present invention will be described. The amount of local deflection distortion described above varies depending on the curvature of the cathode ray tube, the magnetic field distribution of the deflection yoke, etc., but approximately 1.0 to 2.0 mm is generated on the screen of a 29-type 110-degree deflection cathode ray tube.

Now, as an embodiment of the deflection yoke according to the present invention, the angle α from the horizontal axis shown in FIG. 1 is approximately 10 to 20 degrees.

The angle β from the vertical axis is set to approximately 20 to 30 degrees, and a magnet 5 of approximately 10 to 15 Gauss is placed at this position,
Furthermore, at a position corresponding to approximately half of the above angle,
By arranging the S-type body 6 made of ferrite material,
It is possible to obtain a correction effect of about 1.0 to 2 Omm, which is sufficient to correct the above-mentioned local deflection distortion.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to locally control the deflection magnetic field inside the deflection yoke. It is possible to correct the deflection distortion without greatly affecting the deflection distortion of the outer frame of the screen, and it is possible to achieve the effect that good screen performance with little distortion can be obtained on the cathode ray tube screen.

[Brief explanation of the drawing]

FIG. 1 is a front view of the deflection yoke according to the present invention, No. 21￥J
6 is a perspective view of the deflection yoke seen from the rear electron gun side.
The figure is a front view of the main part of the deflection yoke, Figure 4 is a diagram showing the rask shape after correction on the cathode ray tube screen, Figure 5 is a diagram showing the deflection distortion on the cathode ray tube screen, and Figure 6 is a diagram showing the conventional deflection FIGS. 7 and 8 are front views of the main parts of the yoke, and FIGS. 7 and 8 are front views of the main parts for explaining the operating principle of another deflection yoke. FIG. 9 is a diagram showing deflection distortion on a cathode ray tube screen. 1... Deflection yoke, 2... Horizontal deflection coil, 3...
・Vertical deflection coil, 4... Core, 5... Magnet, 6... Magnetic material, 7... Line of magnetic force, 8... Deflection force,
9... Deflection distortion, 10... CRT screen, 11...
- Horizontal axis of the deflection yoke, 12... Vertical axis of the deflection yoke, 16... Cross section of the horizontal deflection coil, 14... Screen raster.

Claims (1)

[Claims] 1. A first magnet is placed near the horizontal axis of the deflection yoke at the opening end of the deflection yoke on the screen side or at the rear side of the transition portion of the deflection coil, so that the polarity thereof is parallel to the horizontal axis. and a second magnet is arranged near the vertical axis so that its polarity is parallel to the vertical axis, and a certain distance from the first magnet is placed on the horizontal axis side of the first magnet. A deflection yoke characterized in that a first magnetic body is provided and a second magnetic body is disposed on the vertical axis side of the second magnet at a constant distance from the second magnet. 2. Place the first magnet at an angle of 10 to 20 degrees from the horizontal axis, place the second magnet at a position of 20 to 30 degrees from the vertical axis, and set an angle approximately half of each of the above angles. The deflection yoke according to claim 1, characterized in that first and second magnetic bodies are arranged at the positions. 3. The deflection yoke according to claim 1, wherein the first and second magnets have a diameter of approximately 10 to 15 Gauss. 4. The deflection yoke according to claim 1, wherein the first and second magnetic bodies are ferrite materials.