JP2000200566A - Color picture tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce lateral-line misconvergence generated in an intermediate region in the vertical direction in an upper and lower deflection region on a phosphor screen face. SOLUTION: This color picture tube device, for reproducing a color image on a phosphor screen face by deflecting an electron beam emitted from an inline electron gun, periodically in the vertical direction and in the horizontal direction by a deflection device 9, is equipped with a correction device for correcting lateral-line misconvergence. The correction device is so composed that correction coils 17a-17d are arranged one by one on the positions, corresponding to each quadrant of a deflection region of the electron beam, of the front end part of a resin frame 15 of the deflection device 9, and that the intensity of a correction magnetic field generated by each correction coil becomes maximum, when a deflection quantity of the electron beam becomes about a half relative to the whole deflection quantity in the vertical direction from the horizontal axis, and also becomes nearly zero, when the deflection quantity of the electron beam becomes near the horizontal axis passing through the center of the deflection range and near a boundary line between the upper part and the lower part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube apparatus used for a monitor, a television receiver, and the like, and more particularly, to a horizontal line error occurring in a vertically intermediate region in each of an upper half and a lower half of a phosphor screen surface. The present invention relates to a technique for correcting convergence.

[0002]

2. Description of the Related Art In a conventional color picture tube apparatus equipped with an in-line electron gun, when blue and red lines are projected on a phosphor screen, a deflection device (deflection yoke) is used.
The so-called horizontal misconvergence as shown in FIG. 10 occurs due to the delicate correlation between the distortion of the distribution of the magnetic field generated by the above and the inner surface shape of the front panel.

The horizontal line misconvergence is caused by the upper half (first quadrant (I) and second quadrant (II)) and the lower half (third quadrant (III) and fourth quadrant) in the effective size of the phosphor screen surface 50 in the vertical direction. In each of the four quadrants (IV), in a region occupying approximately one-half in the vertical direction (hereinafter, this region is referred to as a “vertical deflection intermediate region”), one red line and one blue line are provided. It is a phenomenon that does not work.

That is, in the first quadrant (I) and the third quadrant (III), blue lines 1B and 3B (shown by broken lines in FIG. 10) are red lines 1R and 3R (shown by solid lines in FIG. 10). , And in the second quadrant (II) and the fourth quadrant (IV), the blue lines 2B, 4B are displaced obliquely below the red lines 2R, 4R.

In order to reduce the occurrence of such horizontal line misconvergence, Japanese Patent Application Laid-Open No. 64-84549 discloses a vertical deflection coil of a deflecting device, a coil portion for generating a pincushion magnetic field and a barrel magnetic field. A method is proposed in which two pairs of coil portions are wound separately into two pairs of coils for generating an electric field, and two pairs of diodes connected in parallel with opposite polarities are connected in series to a coil portion of one pin cushion magnetic field of a vertical deflection coil. Have been. In this method, the generation of the horizontal misconvergence is suppressed by switching the set of the coil of the pincushion magnetic field and the barrel magnetic field at the timing when the amount of deflection of the electron beam is just in the vertical deflection intermediate area (the first conventional technique). Technology).

In Japanese Utility Model Laid-Open Publication No. 63-80756, at least four permanent magnets having magnetic poles in the axial direction of the bobbin are mounted diagonally on the front end side of the bobbin of the deflecting device, and a raster in the intermediate region is provided. A method for simultaneously correcting distortion and horizontal line misconvergence has been disclosed (second prior art).

[0007]

However, in the above-mentioned first prior art, even if the horizontal line misconvergence is improved, the linearity of the vertical line raster is reduced by abrupt switching from the barrel magnetic field to the pincushion magnetic field. Has been reduced, which has caused a problem that the image is rather deteriorated.

Further, according to the second prior art, since a permanent magnet is used, misconvergence occurs on the horizontal axis at the center of the phosphor screen surface, which has not caused horizontal misconvergence until now. However, even if the horizontal line misconvergence in the vertical deflection intermediate area is corrected, there is a problem that the convergence quality of the entire screen is not improved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to accurately correct a horizontal line misconvergence without causing a decrease in linearity of a vertical line raster or misconvergence in other areas. It is an object of the present invention to provide a color picture tube device capable of performing the following.

[0010]

In order to achieve the above object, the present invention provides a glass bulb having a phosphor screen surface on an inner surface of a front panel, and a glass bulb provided inside the glass bulb and having a phosphor screen surface. An in-line electron gun for irradiating an electron beam, deflection means having a horizontal deflection coil and a vertical deflection coil for deflecting the electron beam in horizontal and vertical directions, and a correction magnetic field for correcting horizontal misconvergence And a correction means for changing the intensity of the correction magnetic field in accordance with the amount of deflection of the electron beam in the vertical direction.

With this configuration, it is possible to generate a correction magnetic field having a necessary intensity with respect to the generation amount of the horizontal line misconvergence that changes according to the amount of deflection of the electron beam in the vertical direction, and to accurately correct the horizontal line misconvergence. It becomes possible to correct. Here, the correction means, when the electron beam is deflected to a vertical position where the maximum correction amount is required for the horizontal misconvergence, the intensity of the correction magnetic field acting on the electron beam becomes maximum, When the intensity of the correction magnetic field acting on the electron beam is minimized when the deflection amount of the electron beam in the vertical direction is 0, the horizontal line misconvergence is more effectively achieved. Can be corrected.

More specifically, the correction means comprises a plurality of correction coils for generating a correction magnetic field, and a control means for controlling a current supplied to the plurality of correction coils. The supplied current is increased in accordance with the amount of deflection of the electron beam in the vertical direction, and the correction coil is formed by winding a solenoid coil around a saturable core, so that when the supplied current reaches a predetermined value. If the intensity of the correction magnetic field generated by the correction coil is maximized and the intensity of the correction magnetic field generated by saturation of the saturable core when a current larger than that is supplied is reduced, the configuration is extremely simple. Accordingly, it is possible to generate a correction magnetic field which is maximum in a region where correction of horizontal line misconvergence is most necessary.

Here, if the control means is configured to supply the correction coil with a current that changes in proportion to the vertical deflection current supplied to the vertical deflection coil, the current supplied to the correction coil is reduced. While being synchronized with the deflection of the electron beam in the vertical direction, it is increased according to the deflection amount. Further, the correction means includes a plurality of correction coils for generating a correction magnetic field, and a first circuit connected in series with the plurality of correction coils applies a voltage value of a predetermined magnitude in a forward direction and a reverse direction. And a switching circuit that is energized when it is connected is connected in parallel with a second circuit in which a resistance element is connected in series, and a current that changes in proportion to the vertical deflection current supplied to the vertical deflection coil is supplied to the parallel circuit. You may comprise so that it may be. Also with this configuration, it is possible to generate a correction magnetic field having a maximum in a region where horizontal line misconvergence is most required by a simple configuration.

Here, when the electron beam is deflected to a vertical position at which the maximum correction amount for the horizontal misconvergence is required for the electron beam, a voltage value of a predetermined magnitude to be energized by the switching circuit is deflected. If the voltage value is generated at both ends, the horizontal line misconvergence can be corrected more effectively. In this specification, the “current that changes in proportion to the vertical deflection current” means that the current changes in the same cycle as the change cycle of the vertical deflection current, and the current value is proportional to the current value of the vertical deflection current. Means a changing current. "Proportional" means that the proportionality coefficient is 1
The case is also included.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color picture tube device according to the present invention will be described below with reference to the drawings. FIG.
1 is a partially cutaway side view showing a configuration of a color picture tube device 100 according to the present invention. As shown in FIG. 1, the color picture tube device 100 of the present invention has a blue
A glass bulb 3 having phosphor screen surfaces 2 of three colors that emit green and red light, a shadow mask 4 disposed opposite to the phosphor screen surface 2, and a neck portion 5 of the glass bulb 3
And an in-line electron gun 7 for irradiating the phosphor screen surface 2 with the electron beam 6.

A deflecting device 9 is mounted outside the funnel portion 8 and the neck portion 5 of the glass bulb 3. Purity and static convergence are provided between the electron beam 6 and the deflecting device 9 of the neck portion 5 of the glass bulb 3. A convergence unit 13 having a two-pole magnet 10, a four-pole magnet 11, and a six-pole magnet 12 for adjustment is mounted.

FIG. 2 is an enlarged perspective view of the deflection device 9.
The deflection device 9 includes a pair of horizontal deflection coils 14 for generating a horizontal deflection magnetic field having a pincushion distortion as a whole, and a pair of vertical deflection coils 16 for generating a vertical deflection magnetic field having a barrel distortion as a whole. And a ferrite core 18 is built in the outer periphery of the conical portion.

At the front end (on the phosphor screen surface 2 side) of the resin frame 15 of the deflecting device 9, four correction coils 17a, 1
7b, 17c, and 17d are mounted via resin holders (not shown). Correction coils 17a to 17d
Is located in the correction coil 17 as shown in FIG.
a to 17d are located outside the right and left sides of the rectangular deflection range 21 and inside the top and bottom sides of the rectangular deflection range 21 in a cross section perpendicular to the glass bulb 3 axis at the position where the first to fourth positions of the deflection range 21 are located. One correction coil is installed in each quadrant of the quadrant.

Each of the correction coils 17a to 17d is formed by winding a coil around an outer periphery of a saturable ferrite core in the form of a solenoid, and a magnetic field (correction magnetic field) whose intensity changes in accordance with the amount of vertical deflection of the electron beam. Is generated to correct horizontal line misconvergence. Details will be described later.
FIG. 3 is a schematic block diagram showing a circuit configuration of a television receiver 200 to which the color picture tube device 100 according to the present invention is applied.

As shown in FIG.
Receiving circuit 202, audio circuit 203, color signal reproducing circuit 20
4, synchronization circuit 205, speaker 206, vertical deflection circuit 2
07, horizontal deflection circuit 208 and color picture tube device 10
0 and so on. The receiving circuit 202 detects a television signal received via the antenna 201, separates the television signal into an audio signal, a video signal, and a synchronization signal.
3. The signal is sent to the color signal reproduction circuit 204 and the synchronization circuit 205.

An audio circuit 203 reproduces audio by driving a speaker 206 based on the audio signal. The color signal reproduction circuit 204 demodulates the R, G, and B color signals based on the video signal, applies a voltage corresponding to each color signal to the in-line electron gun 7 of the color picture tube apparatus 100, and applies the signals for R, G, and B. 3
The book is irradiated with an electron beam.

The synchronizing circuit 205 separates the vertical synchronizing signal and the horizontal synchronizing signal from the synchronizing signal, and outputs them to the vertical deflection circuit 207 and the horizontal deflection circuit 208, respectively. The vertical deflecting circuit 207 and the horizontal deflecting circuit 208 generate a sawtooth wave current based on the input synchronization signals, and generate a vertical deflecting current and a vertical deflecting coil 16 of the deflecting device 9 as a vertical deflecting current and a horizontal deflecting current, respectively. To deflect the electron beam 6 of each color regularly in each direction,
The phosphor screen surface 2 is raster-scanned.

FIG. 4 is a diagram showing a connection state between the correction coils 17a to 17d and a pair of vertical deflection coils 16.
As shown in the figure, the correction coils 17a to 17d are connected in series with the vertical deflection coil 16, and a vertical deflection current generated by the vertical deflection circuit 207 is supplied between PQs.
The direction of the magnetic pole of each of the correction coils 17a to 17d (axial direction of each core) is arranged so as to be parallel to the tube axis of the glass bulb 3 and its front end (the phosphor screen surface 2).
(Side end) so that a magnetic pole as described in FIG.

FIG. 5 shows the magnetic poles generated by the correction coils 17a to 17d and the directions of the magnetic fields when the deflection device 9 is viewed from the phosphor screen surface 2 side. FIG. 5 shows the directions of the magnetic fields generated by the correction coils 17a to 17d in the case of upward deflection, that is, when the upper half of the phosphor screen 2 is scanned with the electron beam 6. As shown in the figure, the two right-side coils on the vertical axis have the same magnetic pole, the two left-side magnetic poles have the same magnetic pole, and the two right-side correction coils 17a and 17b.
Has an N pole on the phosphor screen surface 2 side, and has two S coils on the phosphor screen surface side in the two left-side correction coils 17c and 17d. In the case of downward deflection, a vertical deflection current flows through the vertical deflection circuit 207 in a direction opposite to that of the upward deflection, so that a magnetic field is generated in a direction opposite to that of the upward deflection. The N pole and the two right poles are S poles.

FIG. 6 is a diagram showing how the horizontal line misconvergence is corrected by the magnetic field generated by the correction coils 17a to 17d. For convenience of explanation, the magnetic fields of the correction coils 17b and 17d below the horizontal axis in FIG.
The magnetic field generated when the electron beam 6 is deflected downward is opposite to the direction of the magnetic poles shown in FIG.

Attention is paid to the electron beam passing near the correction coil 17a arranged in the first quadrant. Due to the configuration of the in-line electron gun 7, the electron beam (R in FIG. ) Passes through the outermost part, that is, the closest part to the correction coil 17a, so that the correction magnetic field generated by the correction coil 17a receives the strongest correction action (shown by a long upward arrow in FIG. 6).

On the other hand, since the electron beam (indicated by B in FIG. 6) which strikes the blue light-emitting phosphor is far from the correction coil 17a, the correction effect of the correction magnetic field is weakened (FIG. 6). , Indicated by a short upward arrow). Therefore, the electron beam that impinges on the red light-emitting phosphor is deflected more upward by the subtraction of these correction amounts, and as a result, horizontal misconvergence is eliminated.

Since the amount of occurrence of the horizontal line misconvergence is maximum when the amount of deflection in the vertical direction is 1/2 in each quadrant, it is desirable to provide the correction coils 17a to 17d at positions corresponding to the amounts of deflection. . In the above description, for the sake of convenience, it has been described that the correction coil 17a is located exactly on the right vertical boundary line 21a of the deflection range 21. However, since the correction coil 17a is actually provided around the resin frame 15 of the deflection device 9, A position K on the circumference of the resin frame 15, which is an extension of a line connecting the center O of the deflection range 21 and the half point J of the upper half of the boundary 21 a of the deflection range 21. Will be installed.

Assuming that the angle between the horizontal axis and the straight line OJ is θ, as shown in FIG.
In the case of No. 4, tan θ = (3/2) / 4 = 3/8, so that θ becomes approximately 27 °, and the resin frame 1
The correction coil 17a may be attached at a position that is at this angle with respect to the horizontal direction of No. 5. The same applies to the correction coils 17b to 17d in other quadrants.

FIG. 7 is a graph showing the relationship between the amount of deflection of the electron beam in the vertical direction and the strength of the magnetic field generated by the correction coils 17a to 17d. The horizontal axis is the vertical deflection position of the electron beam 6 in the phosphor screen surface 2 or the deflection range 21, where 0 is the horizontal axis, V is the upper end, and -V
Indicates the lower end, respectively. The vertical axis indicates the intensity of the magnetic field generated by the correction coil 17a or 17c in a portion where V is positive (when the electron beam is deflected to the upper half), and in a portion where V is negative (when the electron beam is lower). In the case of being deflected by half, the intensity of the magnetic field generated by the correction coil 17b or 17d is shown.

As shown in FIG. 7, when the electron beam reaches the horizontal axis of the phosphor screen, the vertical deflection current is 0, and the magnetic field generated by each of the correction coils 17a to 17d is also 0. Since the horizontal line misconvergence has not originally occurred at this position, the correction magnetic field may be zero.
As described in FIG. 4, the correction coils 17a to 17d include:
Since the vertical deflection current flows in series with the vertical deflection coil 16, as the electron beam is deflected upward (or downward), the magnetic fields generated by the corresponding correction coils 17a to 17d are synchronized with the vertical deflection current. And become stronger, V / 2
(Or −V / 2), the magnetic field intensity reaches a predetermined value H1.

However, as described above, each of the correction coils 17
For a to 17d, a saturable core is used. If the material and dimensions of the saturable core are appropriately set so that the magnetic field strength is saturated at the above H1,
As the electron beam 6 is further deflected upward (or downward) with a subsequent increase in the vertical deflection current, the correction magnetic field generated by the correction coil becomes weaker.

Therefore, when a correction coil having a saturable characteristic as shown in FIG. 7 is used, the amount of deflection of the electron beam in the vertical direction is close to V / 2 (-V / 2), and the correction magnetic field is highest. Correction coils 17a-1 at positions where they act
If 7d is arranged (see FIG. 6), the misalignment of the horizontal line at the position between the horizontal axis of the deflection range and the upper and lower opposite sides (vertical deflection intermediate area) is corrected most strongly, and the convergence near the horizontal axis is obtained. Does not change, and it can be set so that it hardly changes near the upper side or the lower side of the deflection range, so that the optimal correction of the horizontal line misconvergence is realized.

In general, the maximum correction amount of the horizontal line misconvergence (the maximum deviation amount between the R line and the B line in the vertical direction) is D, and the vertical length of the screen of the color picture tube apparatus 100 is 2L. If the magnetic field strength (maximum magnetic field strength) of the vertical deflection coil 16 when the electron beam 6 is deflected to the upper side (that is, when the electron beam 6 is deflected by L in the vertical direction) is H2, one of the horizontal misconvergence lines is In order to displace the maximum correction amount D and make it coincide with the other, at the position in the vertical direction where the maximum correction amount D is required, the maximum magnetic field strength H2 is increased by r
= D / L × 100 (%) The number of turns of the correction coil, the amount of current, and the like may be set so as to generate a magnetic field of 100%. That is, the relationship of H1 = H2 × (D / L).

However, as described above, in each quadrant, the correction magnetic field acting on the electron beam closest to the corresponding correction coil acts on the further distant electron beam in the same direction, albeit slightly. More specifically, for example, in the first quadrant of FIG. 6, the magnetic field of the correction coil 17a that deflects the electron beam R also acts on the electron beam B slightly. For this reason, in order to completely eliminate the horizontal line misconvergence between the two lines, it is desirable to set the value of H1 to be slightly larger than the value obtained by the above equation. While watching the screen, the value of H1 is finely adjusted using the value obtained by the above equation as a guide, and set to a value at which horizontal line misconvergence does not occur at all.

For example, when the screen size of the color picture tube device 100 is 19 inches with an aspect ratio of 3: 4, the maximum correction amount of the horizontal line misconvergence is 0.05 mm to 1 mm.
Degree occurs. At this screen size, the 2L is 265
(Mm), the maximum correction amount D = 0.05 (mm)
In the case of, the above r = (0.05 / 132.5) × 100
= 0.038 (%), and similarly, the maximum correction amount D =
When it is 1 (mm), r = (1 / 132.5) × 100
= 0.75 (%). Therefore, in this example,
The final correction coils 17a to 17a-1 are subjected to the fine adjustment process at the trial production stage, with the target that H1 is approximately in the range of 0.038% to 0.05% of H2.
7d is determined.

Specifically, in the case of a 19-inch front flat type color picture tube device, an Mg-Zn based
-A coil made of a Zn-based material, Ni-Zn-based material, etc. and wound around a square ferrite core with a cross section of 1 mm in both length and width and a length of 25 mm and a copper wire of 0.2 mm in thickness for 40 turns. The correction coil was placed at the front end of the resin frame 15 of the deflecting device 9 at a position of about 27 degrees from the horizontal axis in the first quadrant, and the other quadrants were also placed at the same position and tested. However, no horizontal misconvergence occurred.

(Modifications) It is needless to say that the present invention is not limited to the above embodiment, but the following modifications can be considered. (1) In the above embodiment, the correction coils 17a to 17a to
By using a saturable coil as 17d and connecting it in series with the vertical deflection coil 16, the magnetic field intensity changes as shown in FIG. 7 according to the amount of deflection of the electron beam in the vertical direction. However, the following configuration may be adopted.

(1-1) A current generator for generating a sawtooth current having the same phase as that of the vertical deflection current generated by the vertical deflection circuit 207 and having a proportional current value is separately provided. It may be a dedicated control device. (1-2) Also, by using a correction coil using a normal core without using a saturable core, only controlling the current to be applied,
It is also possible to change the intensity of the generated correction magnetic field almost in the same manner as in FIG.

FIG. 8 is a diagram showing an example of such a current control circuit, and FIG. 9 is a graph showing the relationship between the amount of deflection of the electron beam and the intensity of the correction magnetic field obtained by this current control circuit. . In FIG. 9, as in FIG. 7, the horizontal axis indicates the deflection position of the electron beam 6 in the vertical direction in the phosphor screen surface 2 or the deflection range 21, and the vertical axis indicates
When V is positive, the intensity of the magnetic field generated by the correction coil 17a or 17c is shown, and when V is negative, the intensity of the magnetic field generated by the correction coil 17b or 17d is shown.

As shown in FIG. 8, the current control circuit according to the present modification includes a first circuit 31 formed by connecting a switching circuit 19 in which diodes 19a and 19b are connected in parallel in opposite directions and a resistor 20 in series. And the correction coils 17a-
17d is connected in parallel with a second circuit 32 connected in series, and this parallel circuit is connected to two vertical deflection coils 16 connected in series at a connection point S. P and Q at both ends are the same as those in FIG.
And a vertical deflection current is supplied.

The diodes 19a and 19b have exactly the same characteristics, and energization starts when a voltage equal to or higher than the predetermined voltage value E1 is applied in the forward direction. As the value of E1, a voltage value applied to both ends of the switching circuit 19 when the electron beam 6 is deflected to the vertical deflection intermediate area is set. Now, suppose that a vertical deflection current flows in the Q direction from P in the case of upward deflection, and a vertical deflection current flows in the P direction in the case of downward deflection. In the case of the upper deflection, in the small stage where the deflection amount is from 0 to V / 2, the value of the vertical deflection current is small and the value of the partial voltage at the point S is also small, so that both the diodes 19a and 19b in the switching circuit 19 are closed. As it is
The vertical deflection current is exclusively generated by the correction coils 17a to 17a of the second circuit.
It flows to 17d. During this time, the circuit becomes exactly the same as that of FIG. 4, and thus the correction magnetic field increases as in FIG.

However, when the vertical deflection amount becomes V / 2, S
The potential of the point also increases, and the voltage of E1 is applied to both ends of the switching circuit 19, so that the diode 19a conducts, and the vertical deflection current is also shunted to the resistor 20. Therefore, although the vertical deflection current subsequently increases, the current supplied to the correction coils 17a to 17d decreases, and the correction magnetic field also tends to decrease. Here, if the resistance value of the resistor 20 is appropriately adjusted, it is possible to adjust the intensity of the correction magnetic field to gradually decrease when the deflection amount exceeds V / 2 as shown in FIG.

Note that the broken line in the figure shows the change when the correction magnetic field decreases in the case of FIG. 7, and in this modified example, the degree of reduction when V / 2 is exceeded is slightly larger. However, the correction magnetic field becomes maximum at the deflection amount of V / 2, which requires the maximum correction amount for the horizontal line misconvergence, and is close to 0 near the horizontal axis and near the upper side where correction is unnecessary. , The horizontal line misconvergence can be accurately corrected as in the above embodiment, and the convergence in other deflection areas is not adversely affected. This is the same in the case of downward deflection.

(2) In the above embodiment, four correction coils are provided, one for each quadrant, but a total of four correction coils may be provided. However, considering the balance of the correction magnetic field in each quadrant, it is desirable to arrange the same number of correction coils in each quadrant. If the number is too large, the magnetic field in the adjacent quadrant may be adversely affected. Therefore, when more than four correction coils are installed, a total of eight correction coils will be appropriate.

When a plurality of correction coils are provided in each quadrant, the installation positions of the respective correction coils are changed so that the combined amount of the magnetic field intensity generated by each of the plurality of correction coils changes as shown in FIG. And the ratio of the number of turns of the coil, the current ratio to be supplied, the direction of the current, and the like. (3) In the above embodiment, the correction coil is installed at a position of about 27 ° from the horizontal axis in each quadrant. However, when the occurrence position of the horizontal line misconvergence in each quadrant is different, the horizontal line is provided for each quadrant. By providing each correction coil at a position corresponding to a position where the amount of misconvergence is maximized, optimal correction of horizontal misconvergence is realized.

[0047]

As described above, the color picture tube apparatus according to the present invention is provided with the correction means for generating the correction magnetic field for correcting the horizontal line misconvergence, and the intensity of the correction magnetic field generated by the correction means is reduced. Are configured to change according to the amount of deflection of the electron beam in the vertical direction. This makes it possible to generate a correction magnetic field having a necessary intensity with respect to the generation amount of the horizontal line misconvergence that changes according to the amount of deflection of the electron beam in the vertical direction, thereby enabling accurate correction of the horizontal line misconvergence. .

When the electron beam is deflected to the vertical position where the maximum correction amount is required for the horizontal misconvergence, the intensity of the correction magnetic field acting on the electron beam is maximized. And when the deflection amount of the electron beam in the vertical direction is 0,
By changing the intensity of the correction magnetic field acting on the electron beam so as to be minimum, more effective correction of the horizontal misconvergence is realized.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a color picture tube device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a deflection device provided with a deflection coil and a correction coil.

FIG. 3 is a block diagram showing a circuit configuration of a television receiver using the color picture tube device according to the present invention.

FIG. 4 is a diagram illustrating a connection state between a correction coil and a vertical deflection coil.

FIG. 5 is a diagram showing the direction of a magnetic field generated by a correction coil when an electron beam is deflected upward.

FIG. 6 is a diagram showing a state in which a horizontal misconvergence is corrected by a magnetic field generated from a correction coil.

FIG. 7 is a diagram illustrating the relationship between the amount of deflection of an electron beam in the vertical direction and the intensity of a magnetic field generated by a correction coil.

FIG. 8 is a diagram showing another connection example of the correction coil and the vertical deflection coil.

9 is a diagram showing a relationship between the amount of deflection of the electron beam in the vertical direction and the intensity of the magnetic field generated by the correction coil when the connection state shown in FIG. 8 is set.

FIG. 10 is a diagram showing horizontal misconvergence on a phosphor screen surface generated in a conventional color picture tube device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front panel 2 Phosphor screen surface 3 Glass bulb 5 Neck 6 Electron beam 7 In-line electron gun 9 Deflection device 13 Convergence unit 14 Horizontal deflection coil 15 Resin frame 16 Vertical deflection coils 17a to 17d Correction coil 19 Switching circuit 19a, 19b Diode REFERENCE SIGNS LIST 20 resistance 21 deflection range 100 color picture tube apparatus 200 television receiver 204 color signal reproduction circuit 205 synchronization circuit 207 vertical deflection circuit 208 horizontal deflection circuit

Claims (11)

[Claims] 1. A glass bulb having a phosphor screen on an inner surface of a front panel; an in-line electron gun disposed inside the glass bulb for irradiating an electron beam on the phosphor screen; A deflection unit having a horizontal deflection coil and a vertical deflection coil for deflecting in each of the direction and the vertical direction; and a correction unit for generating a correction magnetic field for correcting a horizontal line misconvergence. A color picture tube device wherein the intensity of a correction magnetic field is changed in accordance with the amount of deflection of a beam in a vertical direction. 2. The correction unit according to claim 1, wherein the intensity of the correction magnetic field acting on the electron beam is maximized when the electron beam is deflected to a vertical position at which a maximum correction amount is required for the horizontal misconvergence. 2. The device according to claim 1, wherein when the amount of deflection of the electron beam in the vertical direction is zero, the intensity of the correction magnetic field is changed so that the intensity of the correction magnetic field acting on the electron beam becomes minimum. Color picture tube device. 3. The color image receiving apparatus according to claim 1, wherein said correction means includes a plurality of correction coils for generating a correction magnetic field, and a control means for controlling a current supplied to said plurality of correction coils. Tube equipment. 4. The control means increases the current supplied to the correction coil according to the amount of deflection of the electron beam in the vertical direction, and the correction coil is formed by winding a solenoid coil around a saturable core. When the supplied current reaches a predetermined value, the intensity of the correction magnetic field generated by the correction coil is maximized, and when a current larger than that is supplied, the saturable core is saturated and the correction generated 4. The structure according to claim 3, wherein the strength of the magnetic field is reduced.
A color picture tube device as described in the above. 5. The control unit according to claim 3, wherein the control unit supplies a current that changes in proportion to a vertical deflection current supplied to the vertical deflection coil to the correction coil.
3. A color picture tube device according to claim 1. 6. The deflection means includes a vertical deflection control means for controlling a vertical deflection current supplied to a vertical deflection coil, and the vertical deflection control means also serves as the control means.
6. The color picture tube device according to claim 4, wherein the plurality of correction coils are connected in series with the vertical deflection coil, and supplied with a vertical deflection current. 7. The correction means includes a plurality of correction coils for generating a correction magnetic field, and a first circuit in which the plurality of correction coils are connected in series,
A switching circuit that conducts when a voltage value of a predetermined magnitude is applied in a forward direction and a reverse direction is connected in parallel to a second circuit in which a switching element and a resistance element are connected in series, and supplied to a vertical deflection coil in the parallel circuit. 2. A color picture tube device according to claim 1, wherein a current varying in proportion to the vertical deflection current is supplied. 8. A voltage value of a predetermined magnitude to be energized by the switching circuit is determined when the electron beam is deflected to a vertical position where a maximum correction amount is required for horizontal misconvergence. 8. The color picture tube device according to claim 7, wherein the voltage value is generated in the color picture tube. 9. The correction coil is located at a position outside the glass bulb from the deflecting means to the front panel, and is located on each of the left and right sides of a quadrangle forming an outer edge of a deflection range of the electron beam at that position. At least one for each of the first to fourth quadrants having the origin at the center of the deflection range, within the range inside the upper and lower sides. Claims 3 to 8
The color picture tube device according to any one of the above. 10. A position in the vertical direction corresponding to each of the first to fourth quadrants of the deflection range, where the correction coil is installed, in a vertical direction where the maximum correction amount of the horizontal misconvergence is required. The color picture tube device according to claim 9, wherein the color picture tube device corresponds to a position. 11. The position in the vertical direction at which the maximum correction amount of the horizontal misconvergence is required is determined by the amount of deflection of the electron beam in the vertical direction from the horizontal axis passing through the origin of the deflection range of the electron beam. Almost 1 of total deflection
The color picture tube device according to claim 10, wherein the position is at the position of / 2.