JPS61253750A - Convergence compensating device - Google Patents

Abstract

PURPOSE:To enable to compensate or adjust the coma aberration in the up and down direction of a screen and the trilemma of the contents of misconvergence, by converting the effective axial magnetic field length of the compensating magnetic field formed by both sides magnetic bodies, and that of the compensating magnetic field formed by the central magnetic body. CONSTITUTION:In the vertical deflection case, the unit is connected in series to the main vertical deflecting coil so that a vertical deflecting current flows in the direction 24 as shown in the figure. And, a pin cushion shape compensating magnetic field 43 is generated in the direction of the main vertical deflecting magnetic field 41 in the neck portion by the both end magnetic bodies 22A and 22B of the E shaped magnetic bodies 21A and 21B, while a barrel form compensating magnetic field 45 is generated in the reverse direction to that of the main vertical deflecting magnetic field 41 by the central magnetic bodies 23A and 23B. Therefore, the coma aberration in the up and down direction of the screen can be compensated by adding a simple device to the deflecting yoke without changing the trilemma amount determined primarily from the composing condition of the deflecting yoke.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a convergence device for a television receiver using an in-line color cathode ray tube. This invention relates to a convergence correction device capable of correcting or adjusting the amount of alto relemma using the components.

[Background of the invention]

Conventional deflection yokes and coma aberration correction devices for correcting coma aberration on a screen, as described in Japanese Utility Model Publication No. 59-27012, can only adjust coma aberration in a specific direction; As described in Japanese Utility Model Publication No. 50-8506, there is a means for arbitrarily adjusting coma aberration using an auxiliary coil.

However, in any of the above cases, the function is to correct only the coma aberration on the screen caused by the center electron beam and the electron beams at both ends generated from the inline array electron gun; No consideration was given to means for correcting both aberrations at the same time.

In addition, a device for correcting misconvergence between electron beams at both ends is 5K as described in Japanese Patent Publication No. 51-4816.
A K-shaped magnetic material is used to correct the misconvergence between the electron beams at both ends, but it also has the function of correcting coma aberration between the intermediate electron beam and the electron beam at both ends. Even when performing correction, there is a problem in that the circuit configuration for shaping the current waveform used for correction becomes extremely complicated.

[Purpose of the invention]

The purpose of the present invention is to correct the comatic aberration of the upper and lower rasters on the screen, and to correct the trilemma, which is a component of misconvergence. The object of the present invention is to provide a convergence correction device capable of correcting or adjusting the convergence (see No. 1).

[Summary of the invention]

To achieve the above object, the convergence correction device according to the present invention is provided with a magnetic body having a substantially E shape at the rear end K of a deflection yoke for an in-line color plow/tube, and connected in series with a vertical deflection coil to the magnetic body. An auxiliary coil is provided, and the coils provided at both ends of the one-shaped magnetic body are provided in the middle part so as to generate a magnetic field in the same direction as the main vertical deflection magnetic field generated by the vertical deflection coil. In the filter, the wire is wound so as to generate a magnetic field in the opposite direction to the direction of the main vertical deflection magnetic field, and a mechanism is provided that can vary the length of both ends and the middle part of the E-shaped magnetic body in the tube axis direction. By changing the effective magnetic field length in the tube axis direction of the correction magnetic field created by the magnetic bodies at both ends and the effective magnetic field length in the tube axis direction of the correction magnetic field created by the intermediate magnetic body, coma aberration in the vertical direction of the screen can be reduced. , the trilemma, which is a component of misconvergence, can be corrected or adjusted.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a perspective view showing an embodiment of the present invention. Further, FIG. 1 is a diagram showing the basic configuration of the present invention, and FIG. 1(a),
Ch) and (c) are respectively 1st. Second. A third example is shown. Figure 1 (α) is a diagram of the neck cross section of the cathode ray tube and the convergence correction device viewed from the screen side.
8G and 8R are an electron beam for blue phosphor (B electron beam), an electron beam for green phosphor (G electron beam), and an electron beam for red phosphor (R electron beam), which are arranged on a straight line, respectively. , 31 is the neck part of the cathode ray tube, and 21A.

21B is a pair of convergence yokes made of a substantially E-shaped magnetic material that are opposed to each other with the neck portion 31 sandwiched between the rear portions of the deflection yokes;
An auxiliary coil 15 is wound around 2B, 25A, and 25B, and when each deflects in the upward direction (vertical direction) of the screen,
It is connected in series with the main vertical deflection coil so that the vertical deflection current flows in the current direction 24 shown in the figure. and,
Both end magnetic bodies 22A of these E-shaped magnetic bodies 2jA and 21B
, and 22E generate a pink hook-shaped correction magnetic field 43 in the same direction as the main vertical deflection magnetic field 41 in the neck portion.

The intermediate magnetic bodies 23A and 23E generate a barrel-shaped correction magnetic field 45 in a direction opposite to the direction 41 of the main vertical deflection magnetic field. The correction magnetic field 45 has its vertical end aligned with the electron beam 8.
Due to the bending of the magnetic field, the deflection force of the vertical upward component acting on the central electron beam 8G becomes larger than the deflection force of the vertical component acting on the electron beams BE and 8RIC at both ends. Further, since the correction magnetic field 45 is located near the electron beam, the magnetic flux density of the correction magnetic field 45 at both end electron beams BB and 8R is larger than that at the center electron beam 8R. Therefore, due to the direction of the magnetic field, the vertically downward deflecting force acting on both end electron beams 8B and BRIIC becomes larger than the vertically downward deflecting force acting on the central electron beam 8G. The effects of these correction magnetic fields 43 and 45 mutually help each other, and when the screen is deflected upward, the amount of vertically upward deflection of the central electron beam is much smaller than the vertically upward deflection of the electron beams at both ends. can do. Also, when deflecting the screen downward, the amount of vertically downward deflection of the center electron beam can be made larger compared to the vertically downward deflection of the electron beams at both ends using the same principle, and as a result, as shown in Fig. 2. It is possible to correct coma aberration at the top and bottom edges of the screen as shown in the figure. In FIG. 2, 12R and 12B are red and blue rasters, 12G is a green raster, and 17 is coma aberration.
11 is a cathode ray tube screen.

Next, the specific operation of the first embodiment shown in FIGS. 1 and 3 will be explained in more detail.

For clarity of explanation, this correction method will be explained by breaking it down into two correction components. The two components are shown in FIGS. 4 and 5.

FIG. 4 shows the first correction component.

Note that parts showing the same content as in FIG. 5 are given the same numbers. FIG. 4 shows an E-shaped magnetic body 21A.

It shows the correction component when the wire is wound only on both ends 22A and 22B of 21B. Now consider the case where the electron beam is deflected upward when viewed from the screen side.

41 in the figure is the direction of the vertical deflection magnetic field created by the main vertical deflection yoke, and auxiliary coils connected in series with the main vertical deflection coil are wound around the magnetic bodies at both ends to flow the vertical deflection current. A pincushion-shaped magnetic field is generated within the neck in the direction shown by the dashed arrow. Each of the R, G, and B electron beams has already been deflected upward to some extent by the vertical deflection magnetic field extending toward the electron gun side of the main deflection yoke. The position shown in FIG. 4 has been reached. Each beam has a magnetic field 43 shown in the figure.
is working. This correction magnetic field acts on the electron beams 8B and BG8R at the vertical ends, and due to the bending of the magnetic field, the center electron The horizontal component magnetic field 83 acting on the beam 8G is large. Therefore, the deflection force of the vertically upward component acting on the central electron beam 8G is larger than the deflecting force of the vertically upward component acting on the electron beams BB and BR at both ends, resulting in an error due to coma aberration at the top end of the screen as shown in FIG. Convergence can be corrected.

Also, in the case of downward deflection, the comatic aberration at the lower end of the screen shown in FIG. 2 can be corrected using the same principle. However, in this correction, there is another effect in addition to the effect of correcting coma aberration.

As shown in FIG. 4, the E-shaped magnetic body 21. (,21BK
Therefore, as can be seen from Table 1, the direction of the main correction magnetic field 43 formed within the neck portion is the same as the direction 4 of the main vertical deflection magnetic field.
This is the same direction as 1. Therefore, it is as if the effective magnetic field length of the main vertical deflection magnetic field in the tube axis direction has been extended toward the electron gun side of the deflection yoke, and when deflecting to the corner of the screen, vertical deflection begins before horizontal deflection. This increases color misregistration at corners, and as a result, the amount of trilemma, which is a component of misconvergence, increases. Here, the trilemma will be explained using FIG. 6.

In an in-line color cathode ray tube, if the magnetic field distribution of the deflection yoke is made into a pincushion shape with the horizontal deflection coil and a barrel shape with the vertical deflection coil, the electron beams at both ends can be converged using only the deflection yoke, which is a well-known method of self-convergence. As a general rule, the misconvergence on the screen caused by the electron beams at both ends cannot be completely reduced to zero. For example, if you average only the first quadrant on the screen, a misconvergence pattern like the one shown in Figure 6 will appear. This remaining phenomenon is called the trilemma. Also, 91 and 9 in the figure
2 is a raster generated by the R electron beam and a raster generated by the B electron beam, respectively, and 95 and 96.97 indicate the amount of misconvergence in the upper and lower nine screen corners and the left and right sides of the screen, respectively. Also, in the raster pattern shown in Figure 8, the amount of misconvergence? 5,96
．． The sum of 97, ie, 95 + 96 + 97, is called the trilemma quantity. It is also known that the trilemma amount can be controlled by the difference between the effective magnetic field length of the horizontal deflection magnetic field behind the deflection yoke and the effective magnetic field length of the vertical deflection magnetic field. That is, the trilemma amount is an amount that is uniquely determined once the structure of the deflection yoke is determined, and unless the structure of the deflection yoke is changed, the trilemma amount will not change even if the winding distribution is changed.

Next, the second correction component will be explained using FIG.

FIG. 5 shows the middle part 2 of the E-shaped magnetic bodies 21, 4, 21B.
3A and 23B show the correction components when auxiliary coils are wound only, and now consider the case where the electron beam is deflected upward when viewed from the screen side. In the figure, 41 is the direction of the vertical deflection magnetic field created by the main deflection yoke. In addition, each magnetic body is wound with an auxiliary coil connected in series with the main vertical deflection coil, and a vertical deflection current is passed through it to generate a barrel-shaped magnetic field within the neck in the direction shown by the dashed arrow in the figure. do. BE, 8G.

A magnetic field shown at 45 in the figure acts on each beam of 8R, and since the magnetic flux density of this correction magnetic field is large at the left and right ends, the downward deflection force acting on the beam is smaller than that of electron beam 8. It works strongly on 8R and BE, so if you look at it relatively, G
Since the amount of upward deflection of the electron beam increases compared to the R and E electron beams, it is possible to correct misconvergence due to coma aberration at the upper end of the screen shown in FIG. Also, in the case of downward deflection, misconvergence due to coma aberration at the lower end of the screen shown in FIG. 2 can be corrected using the same principle. However, this second correction component also has another effect in addition to the effect of correcting coma aberration. As shown in FIG. 5, the direction of the main correction magnetic field 45 created by the GC, E-shaped magnetic body 21 is opposite to the direction 41 of the main vertical deflection magnetic field, as can be seen from Table 2, so it is as if the deflection yoke By shunting the vertical deflection magnetic field extending toward the electron gun side, the effective magnetic field length of the vertical deflection magnetic field in the tube axis direction is shortened, which reduces the amount of trilemma, which is a component of misconvergence mentioned earlier. can be done.

Next, the results of actually measuring only the correction magnetic field due to the E-shaped CY will be shown and explained. The measurement results for the cases shown in FIGS. 7 and 8 are shown in Tables 1 and 2, respectively. 7th
The auxiliary coils 15 in the figure are each wound with 250 terres of wire, and pass a direct current of 190 mA. Note that this current value is the vertical deflection current value when the top edge of the 14-inch screen is deflected. Also, in the figure, A, B, C, and 0 represent measurement points, and are between point A and center point O, or between point A and point B (81, 82 are &6■
It is. Also, each of the auxiliary coils 15 in FIG.
The wire is wound with 0 turns each, and a direct current of 190 mA flows through it. In FIG. 8, A, E, C, and 0 are measurement points similar to those in FIG. 7. Also, the values in Tables 1 and 2 are for measurement point A,
Horizontal magnetic flux density component in E, C, and O, unit is Gauss. (The horizontal direction is assumed to be the positive direction.) As can be seen from each of Tables 1 and 2, the horizontal components of the magnetic flux density at the measurement points are different from each other in the cases of K, Fig. 7 and Fig. 8. In the opposite direction, it can be seen in FIG. 7 that the horizontal magnetic field component acting on the central electron beam is larger than the horizontal magnetic field component acting on the electron beams at both ends. Furthermore, in FIG. 8, it can be seen that the horizontal magnetic field components acting on the electron beams at both ends are larger than the horizontal magnetic field components acting on the central electron beam.

Next, an E-shaped CY having the shape shown in Fig. 9 was attached to the rear end of the deflection yoke equipped with a vertical deflection coil having an inductance value of 135 nxK + a resistance value of 62.50, and the intermediate winding and both ends were attached. 14 when changing the number of turns of the winding
Changes in coma aberration and trilemma value in the shape screen are shown in the 10th
It is shown in FIG.

(In the figure, the value of coma aberration is positive when the raster due to the center electron beam is inside the raster due to the electron beams at both ends.) As shown in FIG. As the number of turns of both the middle windings increases, the direction is corrected. Also, as shown in FIG. and is decreasing compared to K.

Further, FIG. 12 shows the relationship between the trilemma value and the amount of coma aberration correction when the wire is wound loosely at both ends and when the wire is wound only at the middle portion. In other words, as shown in the figure, the trilemma characteristics are significantly different when the E-shaped magnetic material is wound at both ends and when it is wound at the middle part, even under the conditions for obtaining the same amount of coma aberration correction. It can be seen that the trilemma increases in the case where the wire is wound in the middle portion, and the trilemma decreases in the case where the wire is wound in the middle portion.

To summarize the above, the first correction component, which is the correction using the windings at both ends of the E-shaped magnetic material, corrects coma aberration, and increases the trilemma, and the second correction component, which In the correction using the middle winding of the E-shaped magnetic material,
Comatic aberrations are corrected and trilemmas are reduced.

The first embodiment of the present invention is a combination of the two correction components described above, and the amount of correction of coma aberration is further increased, and the change in the trilemma is the effect of the first correction component,
The effects of the second correction component cancel each other out, making it possible to correct comatic aberration with little trilemma change.

That is, by using the present invention, it is possible to correct coma aberration, especially in the vertical direction of the screen, by adding a simple device to the deflection yoke without changing the amount of trilemma, which is uniquely determined by the structural conditions of the deflection yoke. I can do it.

Next, a second embodiment of the present invention will be explained using FIG. 1(h). FIG. 1(A) is a perspective view of an E-shaped magnetic body portion in the present invention. This E-shaped magnetic body has a length 61 in the tube axis direction of both end portions 51 and a length 62 in the tube axis direction of the intermediate portion 52.
It is longer than . Therefore, according to this structure,
The effective magnetic field length in the tube axis direction of the magnetic field generated by the both end windings 53 is longer than the effective magnetic field length in the tube axis direction of the magnetic field generated by the intermediate portion winding 54. The effect of increasing the trilemma amount exceeds the effect of decreasing the trilemma amount due to the intermediate winding, and as a result, the trilemma can be increased. The amount of trilemma, which is a component of misconvergence, is ideally zero by definition, so for example, the amount of trilemma is
In a negative deflection yoke, if the correction according to the second embodiment is performed, the amount of trilemma can be brought close to zero, and coma aberration can also be corrected. That is, by changing the lengths of the E-shaped magnetic body between both ends and the middle part on the tube axis, it is possible to change the amount of trilemma to an arbitrary value and to correct comatic aberration.

Next, a third embodiment of the present invention is shown in FIG. 1 (1). FIG. 1(1) is a perspective view of only the E-shaped magnetic body portion in the present invention. As shown in the figure, the lengths of both end portions 71 and intermediate portion 72 of the E-shaped magnetic material in the tube axis direction can be varied by horizontally sliding each of the multilayered magnetic material pieces. By changing the length of the magnetic material in the tube axis direction, the effective magnetic field length in the tube axis direction 18 of the magnetic field generated by both end windings 73 and the magnetic field generated by the intermediate portion winding 74 in the tube axis direction 18 can be changed. By arbitrarily varying the effective magnetic culm length, it is possible to freely adjust the amount of correction for coma aberration, yormis convergence, and the amount of trilemma, which is a component of misconvergence. therefore.

By performing the correction according to the present invention, for a deflection yoke with arbitrary values of coma aberration and trilemma amount in a single DY,
It is possible to set comatic aberration and trilemma amount to desired values.

Note that, contrary to the raster pattern shown in FIG. It is obvious that it would be better to do the opposite.

〔Effect of the invention〕

According to the present invention, coma aberration in the vertical direction of the screen can be corrected or adjusted with a single deflection yoke, and the VC,
Once the structure of DY is determined, the amount of trilemma, which is the component of misconvergence that is considered to be uniquely determined, can be adjusted in a simple way, and a practically effective convergence correction device can be developed to obtain images with good convergence quality. Can be provided.

[Brief explanation of drawings]

Figure 1 (α) l (b) # (C) is a front view and perspective view showing the configuration of an embodiment of the present invention, Figure 2 is a pattern diagram showing comatic aberration, and Figure 3 is an illustration of an embodiment of the present invention. FIG. 2 is a perspective view showing an example. Figures 4 and 5 are front views showing the principle of humbargence correction using E-shaped magnetic bodies. Figure 6 is a pattern diagram showing the trilemma pattern. Figures 7 and 8 are diagrams showing measurement points for magnetic field measurement. FIG. 9 is a front view showing the shape of an E-shaped magnetic body according to an embodiment of the present invention, and FIG. 10 is a characteristic diagram showing the relationship between on-screen coma aberration and the number of turns of the auxiliary coil when the present invention is used. FIG. 11 is a characteristic diagram showing the relationship between the trilemma and the number of turns of the auxiliary coil, and FIG. 12 is a characteristic diagram showing the relationship between the trilemma and the amount of coma aberration correction. 1: Deflection yoke 3: Vertical deflection coil 4: Core 5: Separator (insulator) 6: Clip 8, 8R, 8B: Electron beam 10: Vertical deflection force 11 CRT screen 12R, 12G, 12B: Raster 15 .42, 44, 53, 54, 74, 74: Auxiliary coil 17: Comatic aberration 18: Tube axis direction of deflection yoke 21j, 21B: E-shaped magnetic body 22A, 22E: Both end magnetic bodies 25A, 25E: Intermediate magnetic body Body 24: Direction of current 31 Neck of cathode ray tube 32: Vertical center line 41: Direction of vertical deflection magnetic field 51.71: Both ends of E-shaped magnetic body 52.72:
Intermediate portion of E-shaped magnetic body 61: Length of both ends of E-shaped magnetic body in the tube axis direction 62: Length of the intermediate portion of the E-shaped magnetic body in the tube axis direction 12th G) (Shi) (C) Chrysanthemum 2
Fig. II Blind 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Koku No. 8 Fig. 9 Concave sister ] O Zukan ] 1 Koku

Claims (1)

[Claims] 1. A color cathode ray tube having multiple electron guns arranged in-line, a deflection yoke disposed on the neck of the color cathode ray tube, and connecting the multiple electron guns on the neck of the color cathode ray tube. A first magnetic body disposed on the axis, second and third magnetic bodies disposed on both sides of the first magnetic body across the axis, and the first magnetic body sandwiching the neck portion. , fourth, fifth, and sixth magnetic bodies arranged opposite to the first, second, and third magnetic bodies, respectively, in correspondence with the second and third magnetic bodies, respectively. , an auxiliary coil connected in series with the main vertical coil of the deflection yoke is wound around each of the magnetic bodies, and a vertical deflection current is caused to flow through each of the auxiliary coils.
The direction of the correction magnetic field generated in the fifth magnetic body and the third and sixth magnetic bodies and the direction of the correction magnetic field generated by the first and fourth magnetic bodies are configured to be opposite to each other. A convergence correction device characterized by: 2. In the convergence correction device according to claim 1, the length of the magnetic body in the tube axis direction is equal to the first and fourth
The length of the second, third, fifth, and sixth magnetic bodies is formed longer than the length of the magnetic body, or the length of the second, third, fifth, and sixth magnetic bodies is A convergence correction device characterized in that the first and fourth magnetic bodies are formed to have long lengths. 3. In the convergence device according to claim 1, the magnetic body is composed of magnetic bodies laminated in multiple layers in the tube axis direction, and each of the laminated magnetic bodies slides in the axial direction connecting the multiple electron guns. A convergence correction device characterized in that the convergence correction device is arranged such that the convergence correction device can