JP3215132B2 - In-line color picture tube device - Google Patents

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 picture tube device which emits three electron beams arranged in a line.
In particular, the present invention relates to an in-line type color picture tube device for improving the convergence of the three electron beams.

[0002]

2. Description of the Related Art In general, a color picture tube apparatus deflects a three-electron beam emitted from an electron gun by a magnetic field generated from horizontal and vertical deflection coils of a deflection yoke mounted outside an envelope to form a shadow mask. The phosphor screen is horizontally and vertically scanned through the screen so as to display a color image on the phosphor screen.

[0003] In such a color picture tube device, an electron gun is an electron gun which emits three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same horizontal plane. In combination with a deflection yoke that generates an asymmetric magnetic field, the horizontal deflection magnetic field generated by the pincushion type and the vertical deflection magnetic field generated by the vertical deflection coil is a barrel type, the three electron beams arranged in a line are self-concentrated. Convergence type in-line color picture tube devices are widely used.

As the deflection yoke, generally, a saddle / saddle type deflection yoke in which both horizontal and vertical deflection coils are a pair of saddle type deflection coils, or a horizontal deflection coil as a pair of saddle type deflection coils and a vertical deflection coil as a core. A semi-toroidal deflection yoke which is formed by directly winding a coil and having a toroidal shape is used.

By the way, the self-convergence type in-line type color picture tube apparatus described above does not require a circuit correcting means, and as shown in FIG. 8, a pattern 2B, 1R of a pair of side beams 1B, 1R on a phosphor screen. 2R can be matched. However, the pattern 2G of the center beam 1G is smaller than the patterns 2B and 2R of the pair of side beams 1B and 1R, and is indicated by HCR and VCR at the horizontal axis (X axis) end and the vertical axis (Y axis) end of the phosphor screen. There is a problem that coma aberration occurs and the three electron beams 1B, 1G, and 1R cannot be concentrated on one point on the phosphor screen due to the convergence deviation (coma error).

As a means for correcting the convergence deviation between the center beam 1G and the pair of side beams 1B and 1R, conventionally, as shown in FIG. 9, a convergence cup 4 attached to the beam emitting end of an electron gun has been used. At the bottom,
There is a device in which a magnetic field control element 6 made of a ring-shaped magnetic material surrounding each of the pair of side beam passage holes 5B and 5R is arranged, and correction is performed by controlling a leakage magnetic field at the rear portion of the deflection yoke.

Normally, in the case of a 90 ° deflection color picture tube in which the magnetic field control element 6 is not disposed, the HCR is 0 to 0.5 mm, and the VCR is
Is about 1.0 to 2.0 mm, but when the magnetic field control element 6 is arranged as described above, its HCR and VCR can be made almost zero. However, as described above, the magnetic field control element 6
As shown in FIG. 10, a convergence shift called HCR right shift occurs in which the pattern 2G of the center beam 1G shifts to the right with respect to the patterns 2B and 2R of the pair of side beams 1B and 1R. Usually the size is HCR1,
It differs on the left and right as shown by HCR2. When the VCR at the vertical axis end is zero along with this HCR right shift, the vertical beam 2G of the center beam 1G is directed inward with respect to the pair of side beams 1B, 1R patterns 2B, 2R at the diagonal axis end. Vertical Green Droop (VGD)
A convergence shift, which is a kind of higher-order coma aberration, is generated. Among such convergence gaps,
In particular, the HCR right shift is a convergence shift caused by eddy current loss of the magnetic field control element, magnetization due to hysteresis, or the like. The magnitude of the shift is a horizontal deflection frequency of 15.75 kHz.
In the case of z, the size is acceptable, but it increases as the horizontal deflection frequency increases, and in a high resolution color display tube with a high horizontal deflection frequency, it becomes 0.2 to 0.3 mm or more, exceeding the allowable limit. .

For this reason, in recent high-resolution color display tubes, in order to correct the convergence deviation, many corrections are made by using the magnetic field of the deflection yoke itself without using the magnetic field control element 6. In this case, HCR
Can be corrected by the horizontal deflection coil because the shift amount is originally small. However, for the VCR, the correction amount is large and it is difficult to correct by the vertical deflection coil.
Means for correcting by a pair of sub-coils connected in series to the vertical deflection coil is used.

FIG. 11 shows a saddle / saddle type deflection yoke in which the sub-coils are arranged. In this case, the pair of sub-coils 8 are vertically arranged at the rear end of the deflection yoke 9,
By applying a vertical deflection current, a pincushion-type magnetic field is generated in a region where three electron beams pass, and the VCR is corrected by the pincushion-type magnetic field.

Although the HCR right shift does not occur in the correcting means which does not use the magnetic field control element, the vertical green droop occurs as in the case where the magnetic field control element is used, as shown by VGD in FIG. . The size is, for example, 90 ° where the panel curvature (screen curvature) is small.
0.3 ~ in case of deflection flat square type color picture tube
0.4mm, the maximum misconvergence is 0.3
This is a serious defect for high resolution color display tubes requiring .about.0.4 mm, and is the biggest bottleneck in the design of deflection yoke for color display tubes.

As means for correcting the vertical green droop of the color picture tube, JP-A-61-126742, JP-A-61-285543, and JP-A-62-26463.
Japanese Patent Application Publication No. 262350 discloses an arrangement in which magnetic field control elements are arranged in two stages in the tube axis direction. According to the two-stage magnetic field control element, a certain effect can be expected.
However, the first magnetic field control element arranged on the deflection yoke side
Since the VCR that increases due to the second magnetic field control element disposed on the cathode side of the electron gun also needs to be corrected, the first
The correction amount of the VCR of the magnetic field control element is large and considerably large. Therefore, the HCR right shift shown in FIG. 8 further increases and cannot be used for a high resolution color display tube having a high horizontal deflection frequency.

Further, in the case of the saddle / saddle type deflection yoke, since the rear leakage magnetic field of the vertical deflection coil is very small, the magnetic field does not effectively reach the position of the second magnetic field control element arranged on the cathode side. , VGD is difficult to substantially improve. If the second magnetic field control element is arranged at a position where the rear leakage magnetic field effectively acts on the saddle type vertical deflection coil, the first magnetic field control element must be arranged in the main magnetic field of the horizontal and vertical deflection coils. As a result, the right shift of the HCR greatly increases, which is a practical problem.

That is, the two-stage magnetic field control element has
It is effective in the case of a deflection yoke with a relatively low horizontal deflection frequency and a toroidal vertical deflection coil,
If the vertical deflection coil is a saddle type deflection yoke, the desired effect cannot be obtained.

[0014]

As described above, the self-convergence type in-line type color picture tube apparatus has the following features.
The pattern of the pair of side beams on the phosphor screen can be matched without the need for circuit correction means, but the pattern of the center beam becomes smaller than the pattern of the pair of side beams, and the horizontal axis of the phosphor screen is reduced. Coma occurs at the end and the end of the vertical axis, and the three electron beams cannot be focused on one point on the phosphor screen.

As means for correcting the convergence deviation (coma aberration) between the center beam and the pair of side beams, the pair of side beams pass through the bottom of a convergence cup conventionally attached to the beam emitting end of an electron gun. There is an arrangement in which a magnetic field control element made of an annular magnetic material surrounding each of the holes is arranged, and correction is performed by controlling the rear leakage magnetic field at the rear of the deflection yoke. However, when the magnetic field control elements are arranged in this way, the HCR and VCR
Can be set to almost zero, but it causes a new convergence shift called HCR right shift and a convergence shift called vertical green droop. In particular, the HCR right shift increases with an increase in the horizontal deflection frequency, which is acceptable when the horizontal deflection frequency is 15.75 kHz, but is 0.2 to 0 in a high resolution color display tube having a high horizontal deflection frequency. 0.3 mm or more, exceeding the allowable limit.

For this reason, in recent high-resolution color display tubes, in order to correct the convergence deviation, a magnetic field control element is not used, and the correction is performed by the magnetic field of the deflection yoke itself. In this case, since the HCR originally has a small deviation amount, it can be corrected by the horizontal deflection coil. However, the VCR has a large correction amount and is difficult to correct by the vertical deflection coil. A pair of sub-coils are vertically arranged at the rear end of the deflection yoke, and a pincushion-type magnetic field is generated in the passage area of the three electron beams by applying a vertical deflection current to correct the VCR. . According to the correction means which does not use the magnetic field control element, the HCR right shift does not occur, but the vertical green droop occurs in the same manner as in the case where the magnetic field control element is used. In the case of a square type color picture tube, it is 0.3 to 0.4 mm, which is a serious problem for a high resolution color display tube requiring a maximum misconvergence of 0.3 to 0.4 mm. It is the biggest bottleneck in design.

As means for correcting the vertical green droop of the color picture tube, a device in which magnetic field control elements are arranged in two stages in the tube axis direction is disclosed in JP-A-61-126742 and JP-A-61-285543. JP-A-62-2
62350 and the like. However, according to the two-stage magnetic field control element, the first magnetic field control element disposed on the deflection yoke side must also correct the VCR increased by the second magnetic field control element disposed on the cathode side of the electron gun. Therefore, the correction amount of the VCR is large, and the size becomes considerably large. Therefore, the right shift of the HCR is further increased and cannot be used for a high resolution color display tube having a high horizontal deflection frequency. Further, in the case of the saddle / saddle type deflection yoke, since the rear leakage magnetic field of the vertical deflection coil is extremely small, the magnetic field does not effectively reach the position of the second magnetic field control element arranged on the cathode side, and the magnetic field does not substantially reach. It is difficult to improve VGD. If the second magnetic field control element is arranged at a position where the rear leakage magnetic field effectively acts on the saddle type vertical deflection coil, the first magnetic field control element must be arranged in the main magnetic field of the horizontal and vertical deflection coils. As a result, the right shift of the HCR greatly increases, which is a practical problem.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide an in-line type color picture tube apparatus which does not generate HCR right shift and effectively eliminates vertical green droop. .

[0019]

An electron gun which emits three electron beams arranged in a line, consisting of a center beam and a pair of side beams, passing on the same plane, and being positioned closer to the phosphor screen than the electron gun, 3 emitted from the electron gun
Saddle for deflecting the saddle horizontal deflection coils and the three electron beams to deflect the electron beams in the horizontal direction to the vertical direction
And a deflection yoke having a vertical deflection coil having a vertical deflection coil, a pair of upper and lower pairs which are serially connected to the vertical deflection coil at the rear side of the deflection yoke and generate a pincushion magnetic field in a region where three electron beams pass. And a first correcting means comprising sub-coils of
The second correction means, which is a magnetic field control element magnetically coupled to the magnetic field generated by the first correction means, is arranged at a distance from the first correction means so as to surround the center beam on the electron gun side.

[0020]

As described above, when the first correction means comprising a pair of upper and lower sub-coils and the second correction means comprising a magnetic field control element are arranged, the pincushion-type magnetic field generated by the first correction means is applied to the second correction means. Act to increase VCR.
Further, the first correcting means itself reduces coma due to the generated pincushion magnetic field. Therefore, the vertical green droop can be improved by the combination of the first and second correction means.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings based on embodiments.

FIG. 3 shows an in-line type color picture tube device according to an embodiment of the present invention, and FIG. This color picture tube device has an envelope composed of a panel 10 and a funnel 11 integrally joined to the panel 10,
On the inner surface of the panel 10, a phosphor screen 12 composed of a striped three-color phosphor layer that emits blue, green, and red light is formed. Shadow mask 13 with through holes
Is arranged. An electron gun 16 that emits three electron beams 15B, 15G, and 15R is disposed in a neck 14 of the funnel 11, and a phosphor screen 12 is disposed more than the electron gun 16 does.
Outside the funnel 11 on the side, the three electron beams 15B, 15
A deflection yoke 17 for deflecting G and 15R to horizontally and vertically scan the phosphor screen 12 is mounted.

The electron gun 16 is an in-line type electron gun which emits three electron beams 15B, 15G and 15R arranged in a line consisting of a center beam 15G and a pair of side beams 15B and 15R passing on the same horizontal plane. Three cathodes K arranged in a row above, three heaters for heating the cathodes K, and electron emission from each of the cathodes K are controlled to form an electron beam, and the electron beam is applied to the phosphor screen 12. It is composed of a plurality of electrodes that accelerate and focus toward.

The deflection yoke 17 generates a non-uniform magnetic field consisting of a pincushion-type horizontal deflection magnetic field and a barrel-type vertical deflection magnetic field. A deflection coil 18H, a pair of left and right saddle-type vertical deflection coils 18V for generating a barrel-type vertical deflection magnetic field, and each of these coils 18H,
It is composed of a core 19 surrounding 18V.

Further, in the color picture tube device of this example, a pair of sub-coils 21 (first correction means) are arranged at the rear side of the deflection yoke 17 symmetrically with respect to the horizontal axis (X axis). Each of the pair of sub-coils 21 includes a U-shaped core 22 and a coil 23 wound around each core 22. The pair of sub-coils 21 are connected in series to a vertical deflection coil 18V as shown in FIG. 2, and as shown in FIG. 4, a vertical deflection coil generated by the vertical deflection coil is provided in a region where the three electron beams 15B, 15G and 15R pass. The pincushion-type magnetic field 25 is generated in the same direction as the magnetic field 24.

In the color picture tube apparatus of this embodiment, the center beam passes through an arbitrary electrode 27 of the electron gun 16 while being separated from the pair of sub-coils 21 by a fixed distance 1 in the tube axis (Z-axis) direction. A magnetic field control element 29 (second correction means) made of a high-permeability magnetic material such as mu metal is arranged so as to surround the hole 28.

Next, the operation of the color picture tube device provided with the first and second correction means will be described.

As shown in FIG. 5, in this color picture tube apparatus, the magnetic field intensity V0 on the tube axis generated by the saddle type vertical deflection coil 18V has a distribution indicated by a solid line 31 when the sub coil 21 does not operate. The rear leakage magnetic field, that is, the leakage magnetic field to the electron gun side is extremely small. For example, 90 °
In the case of a deflection color picture tube, the maximum magnetic field strength Vmax on the tube axis
Is 50 × 10 Tesla, but the magnetic field intensity V0 at a position of 1 = 20 mm where the magnetic field control element 29 is arranged from the position of the sub coil 21 is only 1 × 10 Tesla. On the other hand, when the sub coil 21 is operated,
21 generates a pincushion-type magnetic field in the same direction as the vertical deflection coil 18V as described above. Moreover, this sub coil 21
Is located outside the core 19, so the leakage magnetic field
As shown by 32, the number greatly increases, and becomes 5 × 10 Tesla at the position where the magnetic field control element 29 is arranged.

Since the horizontal deflection coil 18H is also the same saddle type as the vertical deflection coil 18V, the magnetic field strength on the tube axis is the same as the magnetic field strength of the vertical deflection coil 18V indicated by the solid line 31 in FIG. At the position where the magnetic field control element 29 is arranged, the rear leakage magnetic field hardly exists, and therefore, no magnetic coupling with the magnetic field control element 29 occurs in the horizontal deflection coil 18H.

By the way, the vertical green droop is a high-order coma which appears at the diagonal end of the screen when the coma (VCR) at the vertical axis end is set to zero as described above.
The reason for the occurrence is that the center beam is displaced in the vertical direction with respect to the pair of side beams by the coma aberration correcting means such as the magnetic field control element shown in FIG. 9 and the sub-coil shown in FIG. Since it is incident on a barrel-type vertical deflection magnetic field with strong non-uniformity at an angle larger than that of the side beam, if it is horizontally deflected in this vertical deflection magnetic field,
It is supposed to sag inward at the end of the diagonal axis.

Therefore, when the pair of sub-coils 21 and the magnetic field control element 29 which are the first and second correction means of this example are not present, as shown in FIG. Side beam pattern 34B, 34
R and the center beam pattern 34G are shifted in the vertical direction. In this case, the coma (VCR) at the vertical axis end is corrected and does not exist. The coma at the end of the diagonal axis is almost VC
It becomes R. That is, the vertical green droop in this case is almost zero.

However, when the pair of sub-coils and the magnetic field control element, which are the first and second correction means of this example, are arranged, the magnetic field control element itself surrounding the center beam passage hole of the electrode of the electron gun is The magnetic field is magnetically coupled with the leakage magnetic field of the sub-coil to increase the coma at the vertical axis end as shown by VCR1 as shown in FIG. In this case, contrary to FIG.
Bounces around the periphery as shown by the two-dot chain line, and has a pattern opposite to that of the vertical green droop. The amount of bounce of the center beam pattern 34G can be adjusted by placing the magnetic field control element on the cathode side of the conventional magnetic field control element located at the bottom of the convergence cup and increasing the angle of incidence on the vertical deflection magnetic field. , The size of the vertical green droop shown in FIG. 12 can be made larger than VGD.

On the other hand, since the subcoil itself generates a pincushion-type magnetic field and acts to reduce coma, the coma at the end of the vertical axis is defined as VCR2 as shown in FIG. 6C. The vertical green droop pattern at this time is the same as the conventional one, as indicated by the three-dot chain line, and is opposite to the vertical green droop pattern shown in FIG.

Therefore, the size of the magnetic field control element as the second correction means, the number of turns and the shape of the pair of sub-coils as the first correction means, and the tube axis distance l between the sub coil and the magnetic field control element are appropriately set. As a result, VCR1, VCR
CR2 can be optimized, and the vertical green droop can be improved as shown in FIG.

As a specific example, a vertical green droop of a 15 inch 90 ° deflection flat square type color picture tube is described.
Was 0.35 mm in the past, but could be reduced to 0.1 mm.

When a sub-coil 21 for generating a pincushion-type magnetic field in the same direction as the vertical deflection magnetic field generated by the vertical deflection coil is provided, the number of permanent magnets conventionally used for correcting the VCR can be reduced. be able to. Further, the arrangement of the sub-coil 21 that generates a pincushion-type magnetic field in the same direction as the vertical deflection magnetic field has an effect that the sub-coil 21 makes the electron beam have a vertically long sectional shape. As a result, the phenomenon that the beam spot on the phosphor screen 12 is elongated horizontally due to the non-uniform magnetic field consisting of the pincushion-type horizontal deflection magnetic field and the barrel-type vertical deflection magnetic field of the deflection yoke 17 can be greatly improved, and the resolution is improved Can be done. Table 1 shows a 13-inch flat square type color picture tube device in which a sub coil 21 and a magnetic field control element 29 are arranged (this embodiment).
Are shown in comparison with a color picture tube device (conventional example) in which no sub-coil is arranged .

[0037]

[Table 1]

In the color picture tube device of this example, the correction amount performed by the pair of sub-coils 21 as the first correction means is larger than that of the conventional color picture tube device. The problem can be easily solved by increasing the number of coil turns of the sub coil 21.

In order to obtain the required effect of improving the vertical green droop, it is desired that the distance l between the first and second correction means in the tube axis direction is 10 mm or more.
Good results are obtained when set to around mm.

In the above-described embodiment, the first correction means is constituted by a pair of upper and lower sub-coils each having a coil wound around a U-shaped core. As such a sub-coil, as shown in FIG. There is a type in which a coil 37 is wound around a core 36 and arranged at the rear end of the deflection yoke symmetrically with respect to a vertical axis. The sub-coil 38 generates a six-pole magnetic field 39 in the electron beam passage area to correct the VCR. The sub-coil of the above-described embodiment generates a pincushion-type magnetic field in the same direction as the vertical deflection magnetic field generated by the vertical deflection coil. The sub-coil 38 corrects the vertical coma aberration by giving the pair of side beams 15B and 15R the action opposite to the vertical deflection magnetic field 24 generated by the vertical deflection coil, while correcting the vertical coma aberration. . Therefore, even if such a sub coil 38 is arranged outside the core of the deflection yoke, it cannot increase the vertical leakage magnetic field and cannot be used in the present invention.

[0041]

[0042]

The saddle-type horizontal deflection coil, which is positioned closer to the phosphor screen than the electron gun and horizontally deflects the three electron beams emitted from the electron gun and passing through the same plane in a row, and the vertical direction. At the rear side of a deflection yoke having a saddle-type vertical deflection coil that deflects the first correction means, a first correction means including a pair of upper and lower sub-coils connected in series with the vertical deflection coil and generating a pincushion-type magnetic field in a region where three electron beams pass is provided. The second correction means, which is arranged and magnetically coupled to the magnetic field generated by the first correction means, is separated from the first correction means so as to surround the center beam on the electron gun side. When it is arranged, the pincushion-type magnetic field generated by the first correcting means acts on the second correcting means to increase the VCR, and the first correcting means itself generates the pink color. The Deployment-shaped magnetic field to reduce the coma. Therefore, the vertical green droop can be improved by the combination of the first and second correction means, and the convergence quality of the in-line type color picture tube can be improved. In addition, by arranging sub-coils that generate a pincushion-type magnetic field in the same direction as the vertical deflection magnetic field of the deflection yoke, the use of permanent magnets conventionally used for VCR correction can be reduced. Has the effect of making the electron beam vertically long, greatly improving the horizontal length of the beam spot generated by the non-uniform magnetic field of the deflection yoke, and improving the resolution. Furthermore, vertical like saddle type coil
Even if the leakage magnetic field of the deflection coil is very small,
The magnetic field generated by the first correction means composed of the sub coil
A second supplement comprising a magnetic field control element at a position where it is magnetically coupled to
With the correct means, both horizontal and vertical deflection coils
Deflection yoke with saddle-saddle configuration
VGD can be improved and high frequency deflection
Can be put to practical use even with high definition color display tubes
And can be manufactured with a simple structure.
The magnetic field generated by the first correcting means
The second compensating means is vertical
Corrects with low vertical deflection power without the need for deflection power
Can be put into practical use without increasing costs.
You can do it.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main configuration of an in-line type color picture tube device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a connection between a sub coil and a vertical deflection coil.

FIG. 3 is a diagram showing an overall configuration of the in-line type color picture tube device.

FIG. 4 is an explanatory diagram of a magnetic field generated by the sub coil.

FIG. 5 is a diagram showing a magnetic field intensity on a tube axis generated by a saddle type vertical deflection coil of the in-line type color picture tube device.

FIGS. 6A to 6D are diagrams for explaining a method of correcting a convergence shift by the sub-coil and the magnetic field control element.

FIG. 7 is an explanatory diagram of a pair of E-type sub-coils shown for comparison with the operation of the sub-coils of the in-line type color picture tube device.

FIG. 8 is a view showing a pattern on a phosphor screen of a pair of side beams and a center beam of a conventional in-line type color picture tube device.

FIG. 9 is a diagram of a magnetic field control element arranged at the bottom of a convergence cup of a conventional in-line type color picture tube device.

FIG. 10 shows an inline arrangement of a conventional magnetic field control element.
It is a diagram showing a phosphor pattern on the screen of the pair of side beams and the center beam type color cathode ray tube apparatus.

FIG. 11 is a view of a saddle / saddle type deflection yoke in which conventional sub-coils are arranged.

FIG. 12 is a view showing a pattern on a phosphor screen of a pair of side beams and a center beam of an in-line type color picture tube device in which conventional sub-coils are arranged.

[Explanation of symbols]

 12 ... Phosphor screen 14 ... Neck 15B, 15G ... A pair of side beams 15R ... Center beam 16 ... Electron gun 17 ... Deflection yoke 18H ... Horizontal deflection coil 18V ... Vertical deflection coil 19 ... Core 21 ... Sub coil 22 ... Core 23 ... Coil 27… Electrode 28… Center beam passage hole 29… Magnetic field control element

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-126742 (JP, A) JP-A-64-57550 (JP, A) JP-A-61-285643 (JP, A) JP-A-62 262350 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/76 H01J 29/51

Claims (1)

(57) [Claims] 1. An electron gun which emits three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same plane, and an electron gun which is located closer to the phosphor screen than the electron gun and emitted from the electron gun. Deflect the three electron beams to be applied horizontally
A deflection yoke having a saddle-type horizontal deflection coil and a saddle-type vertical deflection coil for deflecting the three electron beams in the vertical direction; a deflection yoke disposed behind the deflection yoke and connected in series to the vertical deflection coil; A first correcting means comprising a pair of upper and lower sub-coils for generating a pincushion-type magnetic field in a passing area of: a.
And an in-line type color picture tube comprising a magnetic field control element disposed so as to surround the center beam and magnetically coupled to the magnetic field generated by the first correction means. apparatus.