JP3034896B2 - Color picture tube equipment - Google Patents

Description

The present invention relates to a color picture tube apparatus comprising a color picture tube and a deflecting device mounted outside the envelope.

(Prior Art) Generally, as shown in FIG. 12, a color picture tube has an envelope composed of a panel (1) and a funnel (2) integrally joined to the panel (1). (1)
Opposed to the shadow mask (3) mounted inside, a fluorescent screen (4) composed of a three-color luminous body layer that emits blue, green and red light is formed on the inner surface of the panel (1). An electron gun (6) for emitting three electron beams is disposed in a neck (5) of the funnel (2). Further, in order to display an image on the phosphor screen (4) by irradiation of the three electron beams emitted from the electron gun (6), the boundary between the cone (7) of the funnel (2) and the neck (5). A deflecting device (8) for deflecting the three electron beams in the horizontal and vertical directions is mounted on the outside, and a static convergence magnet (9) and a purity magnet (10) are mounted on the outside of the neck (5). Have been.

In such a color picture tube device, the fluorescent screen (4)
In order to display an image having no color shift on the top, the three electron beams must be properly projected on the corresponding three-color phosphor layers. ) Needs to be adjusted to the correct position, and the static convergence and the purity magnets (9) and (10) need to be adjusted so that the three electron beams are concentrated at one point on the center of the phosphor screen.

In contrast to the above-mentioned general color picture tube apparatus, recently, the phosphor screen is composed of a three-color phosphor layer having a stripe shape elongated in the vertical direction, and the electron gun is composed of a center beam and a pair of side beams passing on the same horizontal plane. A so-called in-line type color picture tube, which is an in-line type that emits an electron beam, is widely used. This in-line type color picture tube is combined with a deflecting device that forms a non-uniform magnetic field with a pincushion type horizontal deflection magnetic field that deflects the electron beam in the horizontal direction and a barrel type vertical deflection magnetic field that deflects the electron beam in the vertical direction. The feature is that dynamic convergence correction by an external circuit can be made unnecessary, but this color picture tube device still requires adjustment of the mounting position of the deflection device and adjustment of static convergence and purity magnet. There is no change.

Conventionally, the adjustment of the mounting position of the above-mentioned deflecting device and the static convergence and the purity magnet are performed while looking at the screen. For the deflecting device, the rotation adjustment of the deflecting device with respect to the color picture tube is performed on the three-color phosphor layer.
Adjustment to move back and forth in the direction of the tube axis so that the electron beam strikes correctly, fix the electron gun side of the deflection device, and move the phosphor screen side up, down, left and right so that three electron beams are concentrated around the screen There are adjustments. The static convergence and the purity magnet are usually adjusted by rotating a total of six annular magnets, one set of two magnets, and all of these adjustments are performed by manual work and visual judgment on a screen. In addition, these adjustments must be repeated until an optimum adjustment is obtained, which requires not only skill but also time-consuming adjustment.

Furthermore, for large color picture tubes, whose production ratio is increasing recently, it is difficult to adjust the deflection device, static convergence, and purity magnet behind the screen while watching the screen projected on the front. It is necessary to visually check and make adjustments in cooperation with another person, or to use some kind of adjustment device that can make adjustments by one person. There's a problem.

(Problems to be Solved by the Invention) As described above, in order to display a good image without color shift on the screen of the color picture tube, the position of the deflecting device is adjusted, and the static convergence and the purity magnet are adjusted. It is necessary to adjust.
Of these adjustments, especially the adjustment of the position of the deflection device, there are many adjustment items such as rotation of the deflection device with respect to the color picture tube, movement in the direction of the tube axis, swinging up, down, left and right. Since the adjustment has to be performed in the work, there is a problem that the adjustment requires skill and time is required. Especially for large pipes, it is not possible to make adjustments while watching the screen by one person, and adjustments must be made by a pair of two people or a special adjustment device is required. There is a problem that adjustment is difficult.

The present invention has been made in order to solve the above-mentioned problems, and a color picture tube device which can easily adjust a deflection device for a color picture tube and displays a good image without color shift. The purpose is to configure.

[Configuration of the invention]

(Means for Solving the Problems) In a color picture tube apparatus, a deflecting device mounted outside the envelope of the color picture tube is mainly arranged such that the deflection center is located closer to the fluorescent screen than the optimum deflection center of the color picture tube. It consists of a deflecting unit and an auxiliary deflecting unit whose deflection center is closer to the electron gun than the optimum deflection center, and forms a horizontal deflection magnetic field in its main deflecting unit that deflects multiple beams emitted from the electron gun in the horizontal direction. Provide a horizontal deflection coil and a vertical deflection coil for forming a vertical deflection magnetic field to deflect the plurality of beams in the vertical direction,
On the other hand, a horizontal deflection coil for forming a horizontal deflection magnetic field for deflecting the plurality of beams in the horizontal direction and a vertical deflection coil for forming a vertical deflection magnetic field for deflecting the plurality of beams in the vertical direction are provided in the auxiliary deflection section. The horizontal deflection magnetic field of the portion is configured to be asymmetrical left and right with respect to the vertical axis, or the vertical deflection magnetic field can be vertically asymmetrical with respect to the horizontal axis.

(Function) As described above, the deflection device is divided into the main deflection portion and the auxiliary deflection portion, and the deflection current flowing through the main deflection portion and the auxiliary deflection portion is adjusted, so that the deflection center is moved back and forth in the tube axis direction. The conventional manual movement adjustment in the tube axis direction can be performed electrically. In addition, by providing an auxiliary coil in addition to a horizontal deflection coil for forming a horizontal deflection magnetic field and a vertical deflection coil for forming a vertical deflection magnetic field in the auxiliary deflection section, the horizontal deflection magnetic field of the auxiliary deflection section is left-right asymmetric with respect to the vertical axis. In addition, the vertical deflection magnetic field can be made vertically asymmetrical with respect to the horizontal axis, so that the conventional manual swinging adjustment of the deflection device can be performed electrically.

Alternatively, the deflection center can be moved back and forth in the tube axis direction by dividing the deflection device into a main deflection portion and an auxiliary deflection portion and adjusting the deflection current flowing through the main deflection portion and the auxiliary deflection portion. The color purity adjustment of the peripheral portion of the screen, which has been performed by moving the deflection device itself in the tube axis direction, can be electrically performed. In addition, the magnetic field that the auxiliary deflecting unit deflects the plurality of beams in the arrangement direction is a barrel type, and the magnetic field that the deflecting device deflects in the arrangement direction of the plurality of beams is the barrel type on the auxiliary deflecting unit side of the deflection center of the entire deflecting device. Then, even if a plurality of beams arranged in one row are shifted from the tube axis and enter the deflection magnetic field of the deflection device, it is possible to eliminate the convergence shift on the array axis. The swing of the deflection device, which has been performed as a convergence adjustment method when the light enters the deflection magnetic field of the deflection device, can be eliminated.

Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

FIG. 1 shows a color picture tube apparatus according to one embodiment. The color picture tube in this example is in-line and has an envelope consisting of a panel (1) and a funnel-like funnel (2) integrally joined to the panel (1). 3) Blue, green and red light emission on the inner surface
A phosphor screen (4) made of a color phosphor layer is formed. Each phosphor layer is composed of a vertically extending stripe,
The stripe-shaped phosphor layers are arranged in a plurality of rows in the horizontal direction. Opposite to and close to the fluorescent screen (4), a shadow mask (3) in which a number of electron beam passage holes are formed is mounted inside. In addition, funnel (2)
Center beam (20G) and a pair of side beams (20B) passing on the same horizontal plane including the tube axis in the neck (5)
(20R) electron gun that emits three electron beams (6)
Are arranged.

A static convergence magnet (9) and a purity magnet (10) are mounted on the outside of the neck (5) of the funnel (2), and the cone (7) and the neck (5) of the funnel (2) are further mounted. A deflecting device (21) is mounted on the outside of the boundary between the two. As shown in FIG. 2, the deflecting device (21) includes a main deflecting section (22) and an auxiliary deflecting section (23) located closer to the electron gun (6) than the main deflecting section (22). . The main deflection part (22) has a pair of upper and lower saddle-shaped horizontal deflection coils (24H) and a core (25a).
A pair of upper and lower toroidal vertical deflection coils (24 V) are provided. On the other hand, the auxiliary deflection unit (23) includes a pair of upper and lower saddle-shaped horizontal deflection coils (26H) similar to the upper and lower main deflection unit (22) and a pair of upper and lower toroidal vertical deflection coils wound around the core (25b). (26V) is provided.

The horizontal deflection coils (24H) and (26H) of the main deflection section (22) and the auxiliary deflection section (23) of the deflection device (21).
The vertical deflection coils (24V) and (26V) should be able to distribute and supply synchronized currents with different current values, respectively, and also to supply synchronized current to the auxiliary coil of the auxiliary deflection unit (23). Connected to a passive circuit using a resistor or LC as a circuit element.

Such a passive circuit can be simple and inexpensive, as shown as an example in FIG. It is also possible to use active elements. In FIG. 13 (a), a variable resistor (40) is inserted in series with the auxiliary deflecting device (23), and by adjusting the resistance value of the variable resistor (40), the auxiliary deflecting device (23) and the main deflecting device ( 22) Adjust the current.
The same circuit can be used even if the deflection power supply (43) is a horizontal deflection power supply or a vertical deflection power supply. The example of FIG. 13 (b) further includes a variable capacitor (4
1) and a variable inductor (42) are added, which is effective when it is necessary to correct a waveform change when the current of each of the deflection devices (22) and (23) is changed. The circuit of this embodiment is an example, and the variable resistor (4
0), the variable capacitor (41) and the variable inductor (42) may be inserted into the main deflection device (22) side, or each variable element (4
0), (41), and (42) can be various combinations such as series and parallel, and each variable element (40), (41),
(42) can be used alone.

The fixing of the deflecting device (21) to the color picture tube depends on the assembling accuracy of the color picture tube and the variation of the deflecting device (21). When the deflection current flowing through the main deflecting unit (22) and the auxiliary deflecting unit (23) is the same as that of the deflecting device (21) so as to be closer to the fluorescent screen (4) than the optimum deflecting center, Is mounted on the electron gun (7) side of the optimum deflection center of the color picture tube.

By the way, when the deflection device (21) is configured and arranged as described above, the deflection current (horizontal and vertical deflection current) of the main deflection unit (22) is Ia, and the deflection current (horizontal and vertical deflection) of the auxiliary deflection unit (23) is set. When the deflection current is Ib, by adjusting the deflection current Ib flowing through the auxiliary deflection section (23) in the range of 0 ≦ Ib ≦ Ia, the same action as the movement in the tube axis direction of the conventional deflection device can be electrically performed. You can do it. That is, the third
As shown in the figure, if the electron beam (20a) is incident on Q1 on the phosphor screen (4) and the predetermined phosphor layer (27) does not properly emit light, the deflection center is located at the position P1. When moving to the position of P2 on the electron gun side (in the direction away from the phosphor screen (4)), the electron beam (20b) is incident on Q2 on the phosphor screen (4) and the predetermined phosphor layer (27) is formed. It will emit light correctly. Conventionally, the movement of the deflection center in the tube axis (Z-axis) direction has been performed by the movement of the deflection device itself. However, in the deflection device (21) of this example, as shown in FIG. Two
2) deflection current IaI0, deflection current Ib of auxiliary deflection section (23)
If the magnetic field intensity distribution on the tube axis in the case of = 0 is a curve (28a), by setting Ia ≠ 0 and Ib ≠ 0, the intensity distribution and the position can be changed as the curve (28b). This has the same effect as the conventional movement of the deflection center from P1 to P2.

The horizontal and vertical deflection magnetic fields formed by the horizontal and vertical deflection coils (26H) and (26V) of the auxiliary deflection section (23) are made asymmetric with respect to the vertical axis and the horizontal axis, so that the swing of the conventional deflection device can be reduced. The same action can be performed electrically. That is, as shown in FIG. 5, current values I1 and I2 flowing through a pair of upper and lower toroidal vertical deflection coils (26V) wound around the core (25b) of the auxiliary deflection section are represented by I1 ≠.
Assuming I2, as shown in FIG. 6 (a) or (b),
Vertical deflection magnetic field (29a), vertically asymmetric with respect to the horizontal axis (2)
9b) is formed, and the three electron beams (20B), (20G),
R) is acted on by a force in the direction of moving the pair of side beams (20B) and (20R) away from each other as shown by the arrow (30a) or in the direction of approaching each other as shown by the arrow (30b). Then, a required magnetic field for correcting the convergence error can be formed.

For example, as shown in FIG. 7, the pair of side beam patterns (31B) and (31R) are vertically asymmetric with respect to the horizontal axis (X axis) (the center beam pattern (31G) is symmetric).
For the convergence error composed of the cross pattern of (1), the current flowing through the pair of upper and lower toroidal vertical deflection coils (26V) shown in FIG. 20R), a vertical deflection magnetic field (29a) is generated which is vertically asymmetrical with respect to the horizontal axis and exerts a force in the direction of moving them away from each other (see FIG. 6 (a)), and the convergence error can be corrected.

Further, as shown in FIG. 8, one of the patterns (31B) and (31R) of the pair of side beams (31R) is used.
For the convergence error where B) is smaller than the other pattern (31R) vertically, as shown in FIG. 9, the core (2V) and the pair of upper and lower toroidal vertical deflection coils (26V) are used.
The correction can be made by supplying an arbitrary current to the auxiliary coil (32) wound around 5b) in synchronization with the current flowing to the vertical deflection coil (26V). That is, if the current flowing through the pair of upper and lower toroidal vertical deflection coils (32V) is I1 = I2 and the current flowing through the auxiliary coil (32) is I3 = 0, the vertical deflection symmetrical about the vertical axis (Y axis) is obtained. Although a magnetic field is formed, by setting I3 ≠ 0, a left-right asymmetric vertical deflection magnetic field (29c) can be formed, and the above-mentioned convergence errors having different magnitudes in the vertical direction can be corrected.

As shown in FIG. 10, the convergence error in which the pair of side beam patterns (31B) and (31R) are vertically asymmetrical cross patterns with respect to the vertical axis (Y axis) is not shown in FIG. As can be easily inferred from the case shown in (2), a vertical unbalanced current is supplied to the pair of upper and lower saddle-shaped horizontal deflection coils of the auxiliary deflection section in synchronization with the current supplied to the vertical deflection coil, and the horizontal deflection magnetic field is vertically deflected. The correction can be made by dynamically changing in synchronization with the magnetic field.

Although some examples of the convergence error correction have been described above, the convergence and the image distortion can be corrected by appropriately changing the deflection magnetic field except for the left and right pincushion distortions.

In addition, when the vertical deflection magnetic field of the main deflection section (22) is a pincushion type and the vertical deflection magnetic field of the auxiliary deflection section (23) is a barrel type, convergence error and image distortion can be corrected more favorably.

 Next, another embodiment will be described.

In the above embodiment, the horizontal deflection coils of the main deflection unit and the auxiliary deflection unit are both saddle type, and the vertical deflection coil is the toroidal type.
The combination of the vertical deflection coils is not limited to the saddle toroidal type, but may be any other combination.

In the embodiment shown in FIG. 11, the main deflection unit (22) and the auxiliary deflection unit (23) denoted by the same reference
In addition to the above, a second auxiliary deflection unit (34) for forming horizontal and vertical deflection magnetic fields on the side of the electron gun (6) is provided adjacent to the auxiliary deflection unit (23).

When the second auxiliary deflecting section (34) is provided in this manner, the electron beam emitted from the electron gun (6) is converted into an auxiliary deflecting section (23).
And before the tube axis (Z) enters the magnetic field of the main deflection section (22).
Axis) to correct for convergence errors. For example, for the convergence error shown in FIG. 7, it is sufficient to deflect the three electron beams slightly upward, and for the convergence error shown in FIG. What is necessary is just to deflect to the side beam (20B) (refer FIG. 1) side.

 Another embodiment of the present invention will be described.

As shown in FIG. 14, the deflecting device (21) comprises a main deflecting section (22) and an auxiliary deflecting section (23) located closer to the electron gun (6) than the main deflecting section (22). Each deflection part (2
2) and (23) are wound around a pair of upper and lower saddle-type horizontal deflection coils (24H) and (25H) forming a horizontal deflection magnetic field and cores (26a) and (26b) forming a vertical deflection magnetic field, respectively. A pair of upper and lower toroidal vertical deflection coils (24V),
(25V), the horizontal deflection coil (24H) of the main deflection section (22) forms a pincushion-type horizontal deflection magnetic field, and the vertical deflection coil (24V) forms a barrel-type vertical deflection magnetic field, whereas the auxiliary deflection section (23) Horizontal and vertical deflection coils (24
V) and (25V) both form a barrel-type vertical deflection magnetic field. As shown by a curve (27) in FIG. 15, the horizontal deflection magnetic field of the entire deflection device is of a pincushion type overall, but the barrel deflection shape is closer to the auxiliary deflection portion than the deflection center P of the entire deflection device. Magnetic field distribution.

The horizontal deflection coils (24H) and (25H) and the vertical deflection coils (24V) and (25V) of the main deflecting unit (22) and the auxiliary deflecting unit (23) of the deflecting device (21) have current values respectively. These are connected to a passive circuit having a circuit element such as a resistor or an LC as shown in FIG. 13 so that different synchronized currents can be distributed and flow.

The fixing of the deflecting device (21) to the color picture tube depends on the assembling accuracy of the color picture tube and the dispersion of the deflecting device (21). When the deflection currents flowing through the main deflection section (22) and the auxiliary deflection section (23) are set to be closer to the fluorescent screen (4) than the deflection center, and the same deflection current flows through the deflection section (21), The color image tube is mounted so that it is closer to the electron gun (6) than the optimum deflection center of the color picture tube.

By the way, when the deflection device (21) is configured and arranged as described above, the deflection current (horizontal and vertical deflection current) of the main deflection unit (22) is Ia, and the deflection current (horizontal and vertical deflection) of the auxiliary deflection unit (23) is set. When the deflection current is defined as Ib, by adjusting the deflection current Ib flowing through the auxiliary deflection section (23) in the range of 0 ≦ Ib ≦ Ia, the same action as the conventional deflection device itself moving in the tube axis direction is electrically performed. Can be performed.

That is, as shown in FIG. 16, when the center of deflection is at the position of P1, the electron beam (20a) is incident on Q1 on the phosphor screen (4), and the predetermined phosphor layer (28) does not emit light properly. ,
The deflection center on the electron gun side (a method to move away from the phosphor screen (4))
When the electron beam (20b) moves to the position of P2, the electron beam (20b) is incident on Q2 on the phosphor screen (4), and the predetermined phosphor layer (27) emits light properly. Conventionally, the movement of the deflection center in the tube axis direction has been performed by moving the deflection device itself. However, in the deflection device (21) of this example, as shown in FIG. Deflection current Ia ≠ 0, auxiliary deflection unit (2
Assuming that the magnetic field intensity distribution on the tube axis when the deflection current Ib = 0 in 3) is a curve (29a), by setting Ia ≠ 0 and Ib ≠ 0, this is represented by a curve (29b). And the position can be changed, so that the conventional deflection center P1
Can have the same effect as the movement from to P2.

Also, in the deflection device (21) of this example, as described above, the horizontal deflection magnetic field has a barrel shape on the auxiliary deflection portion (23) side with respect to the deflection center P of the entire deflection device. Even if it is deviated from the tube axis and enters the deflection magnetic field, a horizontal convergence error does not occur at the end of the horizontal axis,
Good convergence characteristics are obtained.

That is, when the horizontal deflection magnetic field of the deflection device is a pincushion type, the centers of the three electron beams (20B), (20G), and (20R) coincide with the tube axis as shown in FIG. As described above, when accurately entering the pincushion-type horizontal deflection magnetic field (31), a pair of side beams (20B), (2
0R) receives substantially the same deflection from the deflection magnetic field (31), and good convergence is obtained at the end of the horizontal axis of the screen. However, as shown in FIG.
When the centers of the three electron beams (20B), (20G), and (20R) incident on the screen do not coincide with the tube axis, a convergence shift occurs at the end of the horizontal axis of the screen. The relationship between the three electron beams (20B), (20G), and (20R) incident on the deflection magnetic field (31) and the tube axis occurs when the color purity at the center of the screen is adjusted by the permanent magnet (9). Conventionally, this was adjusted by swinging the deflection device. However, the horizontal deflection magnetic field of the auxiliary deflection portion (23) is made barrel-shaped, and the pincushion-type horizontal deflection magnetic field is totally deflected by the deflection device (21). If the auxiliary deflection unit (23) is formed in a barrel shape with respect to the center P, even if three electron beams (20B), (20G), and (20R) enter the horizontal deflection magnetic field while being shifted from the tube axis, a pair of side beams The same deflection action can be applied to (20B) and (20R), and convergence at the end of the horizontal axis of the screen can be improved.

As described above, even when the horizontal deflection magnetic field of the auxiliary deflection unit (23) is of a barrel type, the deflection device (21) is connected to the main deflection unit (22).
If the horizontal deflection magnetic field of the entire deflection device (21) is made into a pincushion type and the vertical deflection magnetic field is made into a barrel shape, the deflection magnetic field can be changed arbitrarily to achieve convergence and Graphic distortions other than left and right pincushion distortions can be easily corrected. Further, by making the vertical deflection magnetic field of the main deflection section (22) a pincushion type, and making the vertical deflection magnetic field of the auxiliary deflection section (23) a barrel type, convergence error and graphic distortion can be corrected more favorably.

〔The invention's effect〕

A deflection device attached to the outside of the envelope of the color picture tube,
It consists of a main deflection unit whose deflection center is located closer to the fluorescent screen than the optimum deflection center of the color picture tube, and an auxiliary deflection unit whose deflection center is located closer to the electron gun than the above-mentioned optimum deflection center. A horizontal deflection coil and a vertical deflection coil for forming horizontal and vertical deflection magnetic fields are provided. On the other hand, a horizontal deflection coil, a vertical deflection coil and an auxiliary coil for forming horizontal and vertical deflection magnetic fields are provided in an auxiliary deflection section. If the horizontal deflection magnetic field of the unit is configured to be asymmetrical with respect to the vertical axis and the vertical deflection magnetic field can be asymmetrical with respect to the horizontal axis, the deflection current flowing through the main deflection unit and the auxiliary deflection unit can be adjusted to adjust the deflection center. Can be electrically moved back and forth in the tube axis direction, and the horizontal deflection magnetic field of the auxiliary deflection unit is asymmetrical with respect to the vertical, and the vertical deflection magnetic field is set with the horizontal axis. By the vertically asymmetric and,
Various convergence errors and image distortions can be electrically corrected, the adjustment of the deflecting device of the color picture tube device can be performed accurately and quickly, and a color picture tube device with good screen quality can be obtained.

Alternatively, the magnetic field for deflecting the plurality of beams in the arrangement direction by the main deflecting unit is a pincushion type, and the magnetic field for deflecting the auxiliary deflecting unit plural beams in the same direction to the magnetic field of the main deflecting unit is a barrel type. If the magnetic field for deflecting a plurality of beams in the arrangement direction is barrel-shaped on the auxiliary deflecting unit side of the deflecting center of the entire deflecting device, by adjusting the deflecting current flowing to the main deflecting unit and the auxiliary deflecting unit, Can be moved back and forth in the tube axis direction, and the color purity of the peripheral portion of the screen, which has been conventionally performed by moving the deflection device itself in the tube axis direction, can be electrically performed.
In addition, the deflection device deflects a plurality of beams in the arrangement direction by the barrel-type deflection magnetic field of the auxiliary deflection unit. The magnetic field is barrel-shaped on the side of the auxiliary deflection unit with respect to the deflection center of the entire deflection device. Even if the beam is deviated from the tube axis in the arrangement direction and enters the deflection magnetic field, it is possible to eliminate the convergence deviation at the end of the arrangement direction. The swing of the deflection device, which has been performed as the convergence adjustment direction when entering the deflection magnetic field, can be eliminated.

[Brief description of the drawings]

1 to 11 are explanatory diagrams of an embodiment of the present invention. FIG. 1 is a diagram showing a configuration of a color picture tube apparatus according to one embodiment of the present invention.
FIG. 2 is a view showing the configuration of the main part, FIG. 3 is a view showing the relationship between the movement of the center of deflection in the tube axis direction and the incidence of the electron beam on the phosphor layer, and FIG. FIG. 5 is an explanatory view of a moving method, and FIG. 5 is a view for explaining a relationship between a current flowing through a pair of upper and lower vertical deflection coils of an auxiliary deflection section and a formed vertical deflection magnetic field, and FIGS. Is a diagram showing a vertical deflection magnetic field which is vertically asymmetric and the direction of the force exerted on the electron beam by the vertical deflection magnetic field. FIG. 7 is a diagram showing a convergence error composed of a cross pattern of a pair of side beams.
FIG. 8 is a diagram of a convergence error in which the size of a pair of side beam patterns is vertically different, and FIG. 9 is a pair of upper and lower vertical deflection coils and an auxiliary coil of an auxiliary deflection unit for correcting the convergence error of FIG. FIG. 10 is a diagram for explaining the relationship between the current flowing through the magnetic field and the formed magnetic field, FIG. 10 is a diagram of a convergence error in which a pair of side beam patterns are asymmetric with respect to the vertical axis, and FIG. FIG. 12 is a diagram showing a configuration of a conventional color picture tube apparatus, FIGS. 13 (a) and 13 (b) are diagrams of a circuit used in the present invention, and FIGS. FIG. 14 is an explanatory view of another embodiment of the present invention, FIG. 14 is an enlarged view showing a configuration of the deflection device, FIG. 15 is a diagram showing a horizontal deflection magnetic field intensity distribution on a tube axis of the deflection device, FIG. Is the displacement of the deflection center in the direction of the tube axis and the electron beam phosphor View showing the relationship between the incident to,
FIG. 17 is a view for explaining the method of moving the deflection center in the tube axis direction, and FIGS. 18 (a) and (b) are views for explaining the influence of the pincushion type horizontal deflection magnetic field on the convergence of three electron beams. FIG. 4 phosphor screen 6, electron gun 20G center beam 20B, 20R pair of side beams 21 deflecting device, 22 main deflecting unit 23 auxiliary deflecting unit 24V main deflecting unit Vertical deflection coil 26H: Horizontal deflection coil of auxiliary deflection unit 26V: Vertical deflection coil of auxiliary deflection unit 32: Auxiliary coil 25H: Horizontal deflection coil of auxiliary deflection unit 25V: Vertical deflection coil 26a of auxiliary deflection unit … Core of main deflection unit 26b …… Core of auxiliary deflection unit

────────────────────────────────────────────────── (5) References JP-A-52-71117 (JP, A) JP-A-54-929 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/76

Claims (1)

(57) [Claims] 1. A color picture tube apparatus comprising a deflecting device for deflecting a plurality of electron beams emitted from an electron gun and scanning a phosphor screen outside the envelope of the color picture tube. A main deflection unit whose deflection center is located closer to the fluorescent screen than the optimum deflection center of the color picture tube; and an auxiliary deflection unit whose deflection center is located closer to the electron gun than the optimum deflection center. The unit comprises a horizontal deflection coil for forming a horizontal deflection magnetic field for deflecting the plurality of beams in the horizontal direction, and a vertical deflection coil for forming a vertical deflection magnetic field for deflecting the plurality of beams in the vertical direction. A horizontal deflection coil for forming a horizontal deflection magnetic field for deflecting the beam in the horizontal direction; and a vertical deflection coil for forming a vertical deflection magnetic field for deflecting the plurality of beams in the vertical direction. Color picture tube apparatus is characterized in that a structure which can be vertically asymmetrically with respect to the horizontal axis of asymmetry or vertical deflection magnetic field with respect to the vertical axis in the horizontal deflection magnetic field.