JP2000059804A - In-line color cathode ray tube and mis-convergence correction device applied thereto - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mis-convergence correction device that is applicable to an in-line color cathode ray tube whose configuration is simplified. SOLUTION: The mis-convergence correction device 5 is provided with a 1st auxiliary coil 20 and a 2nd auxiliary coil 21. The auxiliary coils 20, 21 are connected in series. The correction device 5 is provided with a potentiometer 30 whose slider terminal 32 connects to a connection point C of the auxiliary coils 20, 21. A current fed to the auxiliary coils 20, 21 has the same difference by having only to adjust the slider terminal 32 once even in the case that an electron beam is deflected to an upper part or a lower part of the screen with a simple configuration only with the auxiliary coils 20, 21 and the potentiometer 30. Thus, mis-convergence at both the lower and upper pats of the screen can be corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-line type color cathode-ray tube in which three electron guns are arranged in parallel on a horizontal plane, and a misconvergence correction device applied to the same.

[0002]

2. Description of the Related Art Conventionally, an in-line type color cathode ray tube in which electron guns for irradiating electron beams of red (R), green (G) and blue (B) are arranged horizontally in this order has been known. .
Such a color cathode ray tube is usually provided with a deflection yoke for deflecting the electron beam in the vertical and horizontal directions in order to scan the electron beam emitted from each electron gun.

The deflection yoke has a pair of vertical deflection coils for deflecting the electron beam in the vertical direction. The pair of vertical deflection coils are opposed to each other on the left and right sides of the electron beam passage path. The pair of vertical deflection coils generates a vertical magnetic field so as to be symmetrical about a central axis along the electron beam irradiation direction. The central axis of the vertical magnetic field is usually set to coincide with the central axis of the color cathode ray tube. Thus, by applying an equal electromagnetic force to the three electron beams irradiated in parallel, the deflection angles of the three electron beams are made to coincide.

However, it is very difficult to attach the deflection yoke so that the central axis of the vertical magnetic field is exactly coincident with the central axis of the color cathode ray tube because of the mounting accuracy. Therefore, the center axis of the vertical magnetic field may be deviated from the center axis of the color cathode ray tube. In this case, a red electron beam (hereinafter, referred to as an “R beam”) and a blue electron beam (hereinafter, referred to as a “B beam”) are emitted from each of the three electron guns disposed at both ends. Electromagnetic forces of different magnitudes act on them. Therefore, a so-called misconvergence occurs in which the R beam and the B beam are shifted in the vertical direction on the phosphor screen.

As a conventional technique for correcting misconvergence, there is a technique disclosed in Japanese Patent Application Laid-Open No. 6-6815, for example. FIG. 11 is a circuit diagram showing a configuration of the misconvergence correction device disclosed in this publication. This misconvergence correction device is connected to the vertical deflection coil 90 in series. This misconvergence correction device includes a first correction coil 91 and a second correction coil 91.
It has a correction coil 92. The first correction coil 91
It consists of two coil parts 91a and 91b connected in series. Further, the second correction coil 92 includes two coil portions 92a and 92b connected in series.

The first correction coil 91 forms a parallel circuit with the first potentiometer 93a, and the parallel circuit forms a series circuit with the first diode 94a. The second correction coil 92 forms a parallel circuit with the second potentiometer 93b, and this parallel circuit forms a series circuit with the second diode 94b. These series circuits are connected in parallel with each other.

In this configuration, when the electron beam is deflected to the upper side of the screen, the first diode 94a conducts,
The second diode 94b becomes non-conductive. In this case, the first
Adjusting the potentiometer 93a causes a difference in the amount of current flowing through each of the first correction coil 91 and the second correction coil 92. As a result, the magnetic fields generated by the first correction coil 91 and the second correction coil 92 change. Thereby, the R beam and the B beam are deflected in directions opposite to each other, and the misconvergence on the upper side of the screen can be corrected.

On the other hand, when the electron beam is deflected to the lower side of the screen, the second diode 94b is turned on and the first diode 94a is turned off. In this case, if the second potentiometer 93b is adjusted, each magnetic field generated by the first correction coil 91 and the second correction coil 92 changes as in the case described above. As a result, the R beam and the B beam are deflected in directions opposite to each other, and the misconvergence on the lower side of the screen can be corrected.

[0009]

However, the device disclosed in the above publication discloses two potentiometers 93a and 93b and two diodes 94a and 94a.
b. Therefore, there is a problem that the number of parts is large and the configuration is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a misconvergence correction device applicable to an in-line type color cathode ray tube which can simplify the structure.

It is another object of the present invention to provide an in-line type color cathode ray tube having a simplified configuration by including the above-described misconvergence correction device.

[0012]

According to the technique disclosed in the above-mentioned publication, which is described in the section of "Prior Art",
The two potentiometers can be adjusted individually. Therefore, misconvergence on the upper side of the screen and the lower side of the screen can be individually corrected.

However, misconvergence does not occur only on either the upper side or the lower side of the screen, but usually occurs on both the upper side and the lower side of the screen. Moreover, most of them are displaced by the same amount between the upper side of the screen and the lower side of the screen. Therefore, it is not always necessary to adopt a configuration in which misconvergence on the upper side of the screen and the lower side of the screen can be individually corrected.

In view of such a point, the inventors of the present invention adopt a configuration in which the misconvergence on the upper side of the screen and the lower side of the screen are not individually corrected. A convergence correction device was considered.

That is, in order to achieve the above object, the present invention provides three electron guns arranged in an in-line type, and a vertical deflection coil for vertically deflecting each electron beam emitted from each of the three electron guns. A misconvergence correction device applied to a color cathode ray tube having, the misconvergence correction device is arranged closer to the electron gun side than the vertical deflection coil, is connected in series to the vertical deflection coil, A pair of first auxiliary magnetic fields that are connected in series and generate first vertical magnetic fields for deflecting two outer electron beams of the electron beams respectively emitted from the three electron guns in mutually opposite vertical directions. Outer two of the coils and the electron beams connected in series with each other and emitted from the three electron guns, respectively. A pair of second auxiliary coils for respectively generating a second vertical magnetic field for deflecting the electron beam in a vertical direction opposite to the direction in which the electron beam is deflected by the first vertical magnetic field, the first auxiliary coil and the second auxiliary coil; The coils are connected in series, are connected in parallel to the first auxiliary coil and the second auxiliary coil connected in series, and are connected to a connection point between the first auxiliary coil and the second auxiliary coil. One potentiometer having a movable terminal and providing the same difference in the amount of current to be supplied to the first auxiliary coil and the second auxiliary coil when deflecting the electron beam to either the upper side or the lower side of the screen is further provided. It is a misconvergence correction device characterized by comprising.

The present invention also provides a color cathode ray tube having three electron guns arranged in an in-line type and a vertical deflection coil for vertically deflecting each electron beam emitted from each of the three electron guns. An applied misconvergence correction device, wherein the misconvergence correction device is disposed closer to the electron gun than the vertical deflection coil, and is connected in series to the vertical deflection coil.
The first is connected in series with each other, and deflects two outer electron beams among the electron beams emitted from the three electron guns in mutually opposite vertical directions.
A pair of first auxiliary coils for respectively generating a vertical magnetic field,
A second vertical line connected in series and deflecting two outer electron beams of the electron beams respectively emitted from the three electron guns in a vertical direction opposite to a direction deflected by the first vertical magnetic field. A pair of second auxiliary coils for respectively generating a magnetic field, the first auxiliary coil and the second auxiliary coil are connected in parallel, and even when the electron beam is deflected to either the upper side of the screen or the lower side of the screen, the first auxiliary coil A misconvergence correction device comprising: one potentiometer that makes the same amount of current to be supplied to the coil and the second auxiliary coil.

[0017]

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

Embodiment 1 FIG. 1 is a conceptual diagram showing a configuration of a color cathode ray tube to which a misconvergence device according to Embodiment 1 of the present invention is applied. This color cathode ray tube is an in-line type, and scans a fluorescent screen 1a formed on the inner surface of the panel 1 with electron beams R, G, B of red (R), green (G), and blue (B). By doing so, a color image is displayed.

The color cathode ray tube includes a panel 1, a conical funnel 2 connected to the panel 1, and a cylindrical neck 3 connected to the funnel 2.
Three electron guns 4a, 4b and 4c (only one is shown for convenience in FIG. 1) inside the neck 3 and near the end opposite to the connection with the funnel 2; Is referred to as “electron gun 4”). The three electron guns 4a, 4b, 4c are arranged in parallel along the horizontal direction. The three electron guns 4a, 4b, 4c irradiate electron beams R, G, B along the central axis A of the color cathode ray tube, respectively.

A misconvergence correction device 5 is arranged inside the neck 3 and closer to the funnel 2 than the electron gun 4. The misconvergence correction device 5 corrects misconvergence and does not affect raster distortion.

A deflection coil 6 is arranged inside the neck 3 and on the side of the funnel 2 of the misconvergence correction device 5. The deflection coil 6 scans the electron beam B in the horizontal direction H and the vertical direction V by deflecting the electron beam B emitted from the electron gun 4 in the horizontal direction H and the vertical direction V.

That is, the deflection coil 6 includes a pair of horizontal deflection coils (not shown) and a pair of vertical deflection coils 7.
a, 7b (hereinafter referred to as "vertical deflection coil 7"). The deflection coil 6 generates a horizontal magnetic field and a vertical magnetic field by supplying a current to the horizontal deflection coil and the vertical deflection coils 7a and 7b in a predetermined direction. As a result, the electron beam
Scanning is performed along the horizontal direction H and the vertical direction V.

FIG. 2 is a diagram showing the configuration of the misconvergence correction device 5. FIG. 2 shows the case where the irradiation upstream side is viewed from the electron beam irradiation downstream side. In this case, the arrangement of the colors of the electron beams is BGR in order from the left. FIG. 3 is a circuit diagram showing an electrical configuration of the misconvergence correction device 5.

The misconvergence correction device 5 is provided between the V hot (high voltage application side) and the V cold (earth side), and is connected in series to the vertical deflection coil 7. The misconvergence correction device 5 has an auxiliary core 10. The auxiliary core 10 includes an annular main body 11 and eight rod-like legs 12. The eight legs 12 are
Are provided radially along the circumferential direction, and project radially from the inside of the main body 11 toward the center of the main body 11. The auxiliary core 10 is disposed such that two opposing legs 12a and 12b of the eight legs 12 are along a horizontal plane. Cylindrical bobbins 13a and 13b are mounted on the two legs 12a and 12b, respectively.

The misconvergence correction device 5 also
It has a first auxiliary coil 20 and a second auxiliary coil 21. First auxiliary coil 20 and second auxiliary coil 21
Are connected in series. The first auxiliary coil 20 has two coil units 20a and 20b connected in series. The first auxiliary coil 20 includes three electron beams R, G,
It generates a first vertical magnetic field for deflecting the outer two electron beams B and R of B in mutually opposite vertical directions. For example, the first auxiliary coil 20 deflects the electron beams B and R downward and upward, respectively.

The second auxiliary coil 21 is composed of two serially connected coils.
It has two coil portions 21a and 21b. The second auxiliary coil 21 generates a second vertical magnetic field for deflecting the electron beams B and R in mutually opposite vertical directions. More specifically, the second auxiliary coil 21 deflects the electron beams B and R in the vertical direction opposite to the direction deflected by the first auxiliary coil 20. For example, the second
The auxiliary coil 21 deflects the electron beams B and R upward and downward, respectively.

Two coil portions 20 of the first auxiliary coil 20
a and 20b are a pair of bobbins 13a and 13b, respectively.
It is wound around. More specifically, one coil part 20a of the two coil parts 20a and 20b is wound around the outer peripheral surface of one bobbin 13a, and the other coil part 2a.
0b is wound around the outer peripheral surface of the other bobbin 13b.

The two coil portions 21a and 21b of the second auxiliary coil 21 are provided with a pair of bobbins 13b and
13a. More specifically, one of the two coil portions 21a and 21b is
One coil 21b is wound around the outer peripheral surface of one bobbin 13b, and the other coil portion 21b is wound around the outer peripheral surface of the other bobbin 13a.

The bobbins 13a and 13b have partition plates 14a and 14b attached to the outer peripheral surface, respectively. The coil portion 20a of the first auxiliary coil 20 and the coil portion 21a of the second auxiliary coil 21 are wound at different positions on the outer peripheral surface of the bobbin 13a across the partition plate 14a. The coil portion 20b of the first auxiliary coil 20 and the coil portion 21b of the second auxiliary coil 21
b is wound around the partition plate 14b at different positions on the outer peripheral surface thereof.

The misconvergence correction device 5 also
A potentiometer 30 is connected in parallel to the first auxiliary coil 20 and the second auxiliary coil 21. The potentiometer 30 includes a resistor 31 and a movable terminal 32.
have. The movable terminal 32 is connected to a connection point C between the first auxiliary coil 20 and the second auxiliary coil 21.

In this configuration, the potentiometer 30
By adjusting the position of the movable terminal 32 of the
The division resistance values R1 and R2 of 1 can be adjusted. Therefore, it is possible to make a difference in the amount of current supplied to the first auxiliary coil 20 and the second auxiliary coil 21. Note that reference numeral 3
Reference numerals 3 and 34 denote resistors for adjusting current.

FIG. 4 is a diagram for explaining the misconvergence correction processing. FIG. 5 is a diagram for explaining misconvergence on the screen. In the following description, FIGS. 2 and 3 will be referred to as needed.

When no misconvergence occurs, the movable terminal 32 of the potentiometer 30 is located at the center of the resistor 31 so that the divided resistance values R1 and R2 are equal. As a result, the same amount of current is supplied to the first auxiliary coil 20 and the second auxiliary coil 21. As a result, the first vertical magnetic field H1 generated by the first auxiliary coil 20 and the second vertical magnetic field H2 generated by the second auxiliary coil 21 cancel each other. for that reason,
The electron beam passing through the misconvergence correction device 5 is not deflected.

Next, the case where misconvergence in which the scanning lines of the electron beams R and B are shifted will be described. In this case, the shift amount between the electron beams R and B is
Usually, the upper side U of the screen with the horizontal axis Ha at the center of the screen as the boundary
The amount is the same for both the lower side D and the screen.

As shown in FIG. 5A, when misconvergence occurs in which the electron beam R deviates from the electron beam B to the inner side of the screen, the scanning lines of the electron beams R and B are made to coincide with each other. The electron beam R is displaced outside the screen and the electron beam B is displaced inside the screen.

More specifically, the position of the movable terminal 32 of the potentiometer 30 is adjusted so that the amount of current supplied to the first auxiliary coil 20 is larger than the amount of current supplied to the second auxiliary coil 21. . That is, the position of the movable terminal 32 of the potentiometer 30 is adjusted such that the divided resistance value R1 on the first auxiliary coil 20 side becomes larger than the divided resistance value R2 on the second auxiliary coil 21 side among the resistance values of the resistor 31. I do.

The position of the movable terminal 32 after the adjustment is maintained at the same position during a period in which the electron beam is deflected on both the upper side U and the lower side D of the screen. Therefore, the current flows more in the first auxiliary coil 20 than in the second auxiliary coil 21 during the period of deflecting the electron beam to the upper screen U and the lower screen D. Moreover, the difference is the same during the period in which the electron beam is deflected to the upper side U and the lower side D of the screen. Therefore, the first vertical magnetic field H1 is stronger than the second vertical magnetic field H2 by the same degree. In addition, the direction of the entire vertical magnetic field coincides with the direction of the first vertical magnetic field H1.

During the deflection period toward the upper side U of the screen, the potential of the V hot is higher than the potential of the V cold. Therefore, the first vertical magnetic field H1 generated by the first auxiliary coil 20 is, as shown by a solid line in FIG.
It occurs in a direction diverging from the legs 12a, 12b on which the 13b is mounted. Further, the second vertical magnetic field H2 generated by the second auxiliary coil 21 is opposite to the first vertical magnetic field H1, as shown by a two-dot chain line in FIG.
13b occurs in a direction converging toward the legs 12a and 12b to which the legs 13b are attached.

On the other hand, as described above, the entire vertical magnetic field coincides with the direction in which the first vertical magnetic field H1 is generated.
During the deflection period, the electron beam B on the left exerts a downward force and the electron beam R on the right exerts an upward force. Therefore, the electron beams B and R are displaced downward and upward, respectively.
Therefore, the scanning line of the electron beam B and the scanning line of the electron beam R can be matched. Thus, misconvergence in the upper side U of the screen can be corrected.

In the deflection period toward the lower side D of the screen, the potential of the V cold is higher than the potential of the V hot, contrary to the above case. Therefore, the first vertical magnetic field H1
As shown by a solid line in FIG. 4 (b), the convergence occurs in a direction converging on the legs 12a and 12b, contrary to the case of the deflection period toward the upper side U of the screen. Further, the second vertical magnetic field H2 is generated in a direction diverging from the legs 12a and 12b as shown by a two-dot chain line in FIG.

On the other hand, as described above, even during the period of deflection to the lower side D of the screen, the entire vertical magnetic field remains the first vertical magnetic field H1.
Occurs in the direction of occurrence. Therefore, in the period of deflection to the lower side D of the screen, contrary to the period of deflection to the upper side U of the screen, a force acts on the left electron beam B in the upward direction, and the right electron beam R changes in the downward direction. Force acts in the direction. Therefore, the electron beams B and R are displaced upward and downward, respectively. Therefore, the scanning lines of the electron beam B and the electron beam R can be matched.

In the deflection period toward the lower side D of the screen, the same amount of current to be supplied to each of the auxiliary coils 20 and 21 as in the deflection period toward the upper side U of the screen is provided. Therefore, the amount of displacement of the electron beams B and R can be the same as the period of deflection to the upper side U of the screen. On the other hand, as described above, misconvergence usually has the same shift amount in both the upper screen U and the lower screen D. Therefore, misconvergence on the lower side D of the screen can be corrected without re-adjusting the potentiometer 30.

As shown in FIG. 5B, when misconvergence occurs in which the electron beam B deviates from the electron beam R to the inside of the screen, contrary to the case of FIG.
The position of the movable terminal 32 of the potentiometer 30 is adjusted so that more current flows through the second auxiliary coil 21 than through the first auxiliary coil 20. Specifically, the movable terminal 32 is set at a position where the division resistance value R2 becomes larger than the division resistance value R1.

As a result, the second vertical magnetic field H2 is stronger than the first vertical magnetic field H1 during the period in which the electron beam is deflected to the upper screen U and the lower screen D. Therefore, the direction of the entire vertical magnetic field is the second vertical magnetic field H2.
Will match the direction.

As described above, the direction of the second vertical magnetic field H2 during the deflection period toward the upper side U of the screen is a direction converging on the legs 12a and 12b as shown by a two-dot chain line in FIG. . Therefore, during the deflection period toward the upper side U of the screen,
Each of the electron beams B and R is opposite to the direction shown in FIG.
It will be deflected upward and downward, respectively.

The direction of the second vertical magnetic field H2 during the deflection period toward the lower side D of the screen is a direction diverging from the legs 12a and 12b as shown by a two-dot chain line in FIG. 4B. Accordingly, during the period of deflection toward the lower side D of the screen, the electron beams B and R are deflected downward and upward, respectively, in the opposite direction to the direction shown in FIG.

Therefore, even when misconvergence occurs as shown in FIG. 5B, the misconvergence can be corrected.

As described above, according to the first embodiment, the first auxiliary coil 20 and the second auxiliary coil 21 are connected in series, and the movable terminal 3 of the potentiometer 30 is connected to the connection point C.
2 constitutes a misconvergence correction device 5. Therefore, compared to a conventional device having two potentiometers and two diodes,
The number of parts is small and a simple configuration can be achieved.

Misconvergence usually occurs in the upper screen U and the lower screen D with a shift of substantially the same amount. Moreover, the potentiometer 30 makes the same difference in the amount of current to be supplied to each of the deflecting coils 20 and 21 during the period in which the electron beam is deflected to the upper side U and the lower side D of the screen.

Therefore, one potentiometer 30
, The misconvergence of the upper screen U and the lower screen D can be corrected. Therefore, the correction performance does not deteriorate as compared with a configuration in which misconvergence of the upper screen U and the lower screen D can be individually corrected. In addition, since only one adjustment of the potentiometer 30 is required, the adjustment operation can be easily performed.

Further, since the misconvergence is corrected by the misconvergence correcting device 5 arranged on the electron gun 4 side of the deflection coil 6, the influence on the distortion of the trajectory of the electron beam can be reduced. Therefore, so-called raster distortion can be prevented.

Furthermore, since the auxiliary core 10 has a ring shape having eight protrusions 12, two protrusions 12a on which the bobbins 13a and 13b are mounted are used.
Projections other than 12b can be used for other purposes. For example, it can be used for winding a digital convergence coil and a trilemma (Yh) correction coil. Therefore, since it is not necessary to provide a dedicated core for another purpose, the configuration can be simplified as compared with a case where such a dedicated core is provided.

The digital convergence coil is a coil that is used when a shift amount in each part of the screen is stored in a memory and convergence is corrected based on the shift amount stored in the memory.

Embodiment 2 FIG. 6 is a circuit diagram showing an electrical configuration of the misconvergence correction device 5 according to the second embodiment of the present invention. 6, the same reference numerals are used for the same functional parts as in FIG.

In the first embodiment, the first auxiliary coil 20
And the second auxiliary coil 21 are connected in series, and the potentiometer 30 is connected in parallel with the first auxiliary coil 20 and the second auxiliary coil 21. On the other hand, in the second embodiment, the first auxiliary coil 20 and the second auxiliary coil 21 are connected in parallel via the potentiometer 30.

Even with this configuration, the position of the movable terminal 32 is adjusted only once, and the first auxiliary coil 20 and the second
The same difference can be made between the current amounts supplied to the auxiliary coils 21 respectively. Therefore, misconvergence of the same shift amount can be corrected in the upper screen U and the lower screen D.

Also, since one potentiometer is used without using a diode, two diodes and two potentiometers are used.
Compared with a conventional device having two potentiometers, the number of parts can be reduced and a simple configuration can be achieved.

Further, since the misconvergence is corrected by the misconvergence correction device 5 arranged on the electron gun 4 side of the deflection coil 6, the influence on the distortion of the trajectory of the electron beam can be reduced. Therefore, so-called raster distortion can be prevented.

Embodiment 3 FIG. 7 is a diagram illustrating a configuration of the misconvergence correction device 5 according to the third embodiment of the present invention. 7, the same reference numerals are used for the same functional parts as in FIG.

In the first and second embodiments, the auxiliary core 1
As the configuration of 0, a ring having eight protrusions 12 is used. On the other hand, in the third embodiment, a pair of rod-shaped auxiliary cores 40 and 41 are used.

More specifically, a pair of rod-shaped auxiliary cores 40 and 41 are provided facing each other along a horizontal plane including three electron beam irradiation paths. Each auxiliary core 40,
41 is provided with cylindrical bobbins 13a and 13b, respectively.

As described above, according to the third embodiment, the size can be reduced as compared with the annular auxiliary core 10. Therefore, the configuration can be further simplified as compared with the annular auxiliary core 10. Further, cost reduction, improvement in yield, and improvement in dimensional accuracy can be achieved.

Embodiment 4 FIG. 8 is a diagram showing a configuration of the misconvergence correction device 5 according to the fourth embodiment of the present invention. 8, the same reference numerals are used for the same functional parts as those in FIG.

In the first and second embodiments, the annular auxiliary core 10 is used, and in the third embodiment, a pair of rod-shaped auxiliary cores 40 and 41 are used. On the other hand, in the fourth embodiment, a pair of E-shaped auxiliary cores 50 and 51 are provided.
You are using

More specifically, an E-shaped auxiliary core 50,
Each of the legs 51 has three legs: an upper leg 52a, an intermediate leg 52b, and a lower leg 52c. this house,
The intermediate leg 52b is provided facing the position along the horizontal plane. Cylindrical bobbins 13a and 13b are mounted on each intermediate leg 52b, respectively.

As described above, according to the fourth embodiment, the size can be reduced as compared with the annular auxiliary core 10. Therefore, the configuration can be further simplified as compared with the annular auxiliary core 10. Further, cost reduction, improvement in yield, and improvement in dimensional accuracy can be achieved.

Embodiment 5 FIG. 9 is a diagram showing a configuration of the misconvergence correction device 5 according to Embodiment 5 of the present invention. In FIG. 9, the same reference numerals are used for the same functional parts as in FIG. In FIG. 9, the illustration of the auxiliary core is omitted for convenience.

In the first to fourth embodiments, the bobbin 13
a, 13b attached to the outer peripheral surface of 13b
4b separates and winds the first auxiliary coil 20 and the second auxiliary coil 21. On the other hand, in the fifth embodiment, the first auxiliary coil 20 and the second auxiliary coil 2
1 is wound around a part of the bobbins 13a and 13b. More specifically, the first auxiliary coil 20 is connected to the bobbin 13
After winding around the outer peripheral surface closer to the root side than each of the partition plates 14a and 14b, the second auxiliary coil 21 is overlaid on the first auxiliary coil 20 and wound.

The first auxiliary coil 20 may of course be wound over the second auxiliary coil 21. In addition, each partition plate 14a, 1 of bobbin 13a, 13b
Needless to say, the auxiliary coils 20 and 21 may be wound around the outer peripheral surface on the distal end side than 4b.

As described above, according to the fifth embodiment, the auxiliary coils 20, 21 are wound around only a part of the bobbins 13a, 13b. Therefore, the remaining portions of the bobbins 13a and 13b can be used for other purposes such as winding a digital convergence coil and a trilemma correction coil.

Embodiment 6 FIG. FIG. 10 is a diagram showing a configuration of a misconvergence correction device 5 according to Embodiment 6 of the present invention. 10, the same reference numerals are used for the same functional parts as those in FIG. Note that, in FIG. 10, the illustration of the auxiliary core is omitted for convenience.

In the fifth embodiment, each auxiliary coil 20,
21 is wound around part of the bobbins 13a and 13b. On the other hand, in the sixth embodiment, the first auxiliary coil 20 and the second auxiliary coil 21 are connected to the bobbins 13a,
3b is wound alternately. More specifically,
The misconvergence correction device 5 includes the auxiliary coils 2
0 and 21 are wound around the outer peripheral surface of the bobbins 13a and 13b closer to the root side than the partition plates 14a and 14b in a parallel state.

The auxiliary coils 20, 21 are connected to the bobbin 1
Needless to say, it may be wound around the outer peripheral surface on the tip side of the partition plates 14a, 14b of 3a, 13b.

As described above, according to the sixth embodiment, similarly to the fifth embodiment, the auxiliary coils 20 and 21 are wound around only a part of the bobbins 13a and 13b. Therefore, the remaining portions of the bobbins 13a and 13b can be used for other purposes such as winding a digital convergence coil and a trilemma correction coil.

Other Embodiments Six embodiments of the present invention have been described above. However, it goes without saying that the present invention can adopt other embodiments, and various design changes can be made within the scope described in the claims.

[0076]

As described above, according to the present invention, the first auxiliary coil, the second auxiliary coil, and one potentiometer constitute a misconvergence correction device. Therefore, compared to a conventional misconvergence correction device having two potentiometers and two diodes, the number of components is small and a simple configuration can be achieved. Therefore, it is possible to provide an in-line type color cathode ray tube having a simple configuration.

Also, when the electron beam is deflected to either the upper side of the screen or the lower side of the screen, the same amount of difference can be made with respect to the amount of current to be supplied to the first auxiliary coil and the second auxiliary coil. . Therefore, misconvergence can be corrected by a single potentiometer adjustment. Therefore, the correction performance is not degraded and the adjustment work is simplified as compared with a configuration in which misconvergence on the upper and lower screens can be individually corrected.

When an annular core having eight projections is used as the auxiliary core, a projection other than the projection on which the auxiliary coil is to be wound can be used for other purposes. Therefore, the configuration can be simplified as compared with the case where a dedicated core for another purpose is provided.

Further, when a pair of rod-shaped or E-shaped auxiliary cores are used, the size can be reduced as compared with an annular auxiliary core. Therefore, the configuration can be further simplified as compared with the annular auxiliary core.

Further, when the first auxiliary coil and the second auxiliary coil are wound around a part of the bobbin or wound alternately, the other part of the bobbin can be used for another purpose. Therefore, the number of components is smaller than in the case where a dedicated bobbin is provided, and the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a configuration of a color cathode ray tube to which a misconvergence correction device according to a first embodiment of the present invention is applied.

FIG. 2 is a diagram illustrating a configuration of a misconvergence correction device.

FIG. 3 is a circuit diagram showing an electrical configuration of the misconvergence correction device.

FIG. 4 is a diagram for describing misconvergence correction processing.

FIG. 5 is a diagram for explaining misconvergence on a screen.

FIG. 6 is a circuit diagram showing an electrical configuration of a misconvergence correction device according to Embodiment 2 of the present invention.

FIG. 7 is a diagram illustrating a configuration of a misconvergence correction device according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating a configuration of a misconvergence correction device according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a misconvergence correction device according to Embodiment 5 of the present invention.

FIG. 10 is a diagram showing a configuration of a misconvergence correction device according to Embodiment 6 of the present invention.

FIG. 11 is a circuit diagram showing a configuration of a conventional misconvergence correction device.

[Explanation of symbols]

 4, 4a, 4b, 4c Electron gun 5 Misconvergence correction device 7, 7a, 7b Vertical deflection coil 10 Auxiliary core 11 Main body 12, 12a, 12b Leg 13a, 13b Bobbin 14a, 14b Partition plate 20 First auxiliary coil 21 First 2 Auxiliary coil 20a, 20b, 21a, 21b Coil section 30 Potentiometer 32 Movable terminal 40, 41 Auxiliary core 50, 51 Auxiliary core R, G, B Electron beam H1 First vertical magnetic field H2 Second vertical magnetic field

Claims (8)

[Claims] An error applied to a color cathode ray tube having three electron guns arranged in an in-line type and a vertical deflection coil for vertically deflecting each electron beam emitted from each of the three electron guns. A convergence correction device, wherein the misconvergence correction device is disposed closer to the electron gun than the vertical deflection coil, is connected in series to the vertical deflection coil, is connected in series with each other, and is connected to the three electron guns. A first one for deflecting two outer electron beams of the irradiated electron beams in mutually opposite vertical directions.
A pair of first auxiliary coils for respectively generating a vertical magnetic field, and directions in which two outer electron beams of the electron beams respectively connected in series and irradiated from the three electron guns are deflected by the first vertical magnetic field And a pair of second auxiliary coils for respectively generating a second vertical magnetic field for deflecting in a vertical direction opposite to the first auxiliary coil. The first auxiliary coil and the second auxiliary coil are connected in series. A movable terminal connected in parallel to the first auxiliary coil and the second auxiliary coil, and a movable terminal connected to a connection point between the first auxiliary coil and the second auxiliary coil. Regardless of the direction of deflection to the lower side, the first auxiliary coil and the second
A misconvergence correction device further comprising one potentiometer for making the same amount of current to be supplied to the auxiliary coil. 2. A mistake applied to a color cathode ray tube having three electron guns arranged in an in-line type and a vertical deflection coil for vertically deflecting each electron beam emitted from each of the three electron guns. A convergence correction device, wherein the misconvergence correction device is disposed closer to the electron gun than the vertical deflection coil, is connected in series to the vertical deflection coil, is connected in series with each other, and is connected to the three electron guns. A first one for deflecting two outer electron beams of the irradiated electron beams in mutually opposite vertical directions.
A pair of first auxiliary coils for respectively generating a vertical magnetic field, and a direction in which two outer electron beams out of the electron beams respectively radiated from the three electron guns are deflected by the first vertical magnetic field. A pair of second auxiliary coils for respectively generating a second vertical magnetic field for deflecting in the vertical direction opposite to the above, and the first auxiliary coil and the second auxiliary coil are connected in parallel, and an electron beam is provided on the upper and lower screens. Side, the first auxiliary coil and the second
A mis-convergence correction device, comprising: one potentiometer that makes the same difference in the amount of current to be supplied to the auxiliary coil. 3. The device according to claim 1, further comprising: an annular main body; and a plurality of legs radially provided along a circumferential direction of the main body and projecting radially from inside the main body. And a pair of bobbins attached to two opposing legs of the plurality of legs, wherein the pair of first auxiliary coils are respectively wound around outer surfaces of the pair of bobbins. The in-line type color cathode ray, wherein the pair of second auxiliary coils are wound at positions on the outer surface of the pair of bobbins different from the positions where the first auxiliary coils are wound. Misconvergence correction device applied to pipes. 4. The pair of bobbin according to claim 1, further comprising: a pair of rod-shaped cores; and a pair of bobbins mounted on the pair of rod-shaped cores, respectively. And the pair of second auxiliary coils are respectively wound around positions on the outer surface of the pair of bobbins different from the positions where the first auxiliary coils are wound. A misconvergence correction device applied to an in-line type color cathode ray tube characterized by the following. 5. The pair of E-shaped cores according to claim 1, further comprising a pair of E-shaped cores each having an upper leg portion, a middle leg portion, and a lower leg portion, and mounted on each of the intermediate leg portions of the pair of E-shaped cores. The pair of first auxiliary coils are wound around the outer surfaces of the pair of bobbins, respectively, and the pair of second auxiliary coils are the first auxiliary coil of the pair of bobbins. A misconvergence correction device applied to an in-line type color cathode ray tube, wherein the coil is wound at a position on the outer surface different from the position where the coil is wound. 6. The method according to claim 1, wherein
A misconvergence correction device applied to an in-line type color cathode ray tube, wherein the first auxiliary coil and the second auxiliary coil are wound so as to overlap at some positions on the outer surface of each bobbin. 7. The method according to claim 1, wherein
A misconvergence correction device applied to an in-line type color cathode ray tube, wherein the first auxiliary coil and the second auxiliary coil are alternately wound around a part of the outer surface of each bobbin. 8. The three electron guns arranged in an in-line type, a vertical deflection coil for vertically deflecting each electron beam emitted from each of the three electron guns, and An in-line type color cathode ray tube comprising the misconvergence correction device described in (1).