JPH1083777A - Deflection yoke, cathode-ray tube device, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct misconvergence between a red and a blue horizontal line in a deflection yoke equipped with U-shaped cores for vertical auxiliary coil. SOLUTION: Two U-shaped cores 6a and 6b for vertical auxiliary coil are installed opposingly over and under the tubing 11 of a cathode-ray tube, and convergence correcting coils 16a and 16b are installed at two legs of the core 6a while convergence correcting coils 16c and 16d are installed at the two legs of the other core 6b. These convergence correcting coils 16a-16d are connected in series, and when a correcting current flows in them, the leg tips of the cores 6a and 6b where the coils are mounted will have the same magnetic polarities, and a 4V corrective magnetic field is generated. Thereby the red beam 13R and blue beam 13B receive opposite directed deflecting forces 15R and 15B, and the misconvergence will be corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke for a cathode ray tube, a cathode ray tube device and a display device using the deflection yoke, and more particularly to a deflection yoke provided with convergence correction means.

[0002]

2. Description of the Related Art A conventional example of a deflection yoke provided with a convergence correction means is described in, for example, Japanese Patent Application Laid-Open No. 7-296744. This is provided with an electromagnetic convergence yoke, by which red and blue electron beams are moved to perform convergence correction.

[0003]

In the above prior art, in order to correct misconvergence between a red horizontal line and a blue horizontal line (hereinafter referred to as 4V correction), the electron beam is vertically shifted. Magnetic poles are provided on the left and right, respectively. However, in the case of a deflection yoke in which U-shaped vertical auxiliary coil cores are arranged above and below the electron beam,
4V correction could not be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke capable of performing 4V correction using a U-shaped vertical auxiliary coil core, a cathode ray tube, and a display device using the same. Is to do.

[0005]

According to the present invention, two U-shaped vertical auxiliary coil cores are provided on the electron gun side of a cathode ray tube so as to face the tube body of the cathode ray tube. And a convergence correction coil is provided on both legs of the vertical auxiliary coil core. In this case, the polarities of the magnetic poles generated at both legs of the vertical auxiliary coil core by the magnetic field of the convergence correction coil are all the same.
These convergence correction coils are connected to each other.

As a result, a 4 V correction magnetic field is generated in the cathode ray tube, and it is possible to apply a deflection force in directions different from each other to the red electron beam and the blue electron beam.

According to the present invention, an image rotation correction coil is connected to the convergence correction coil.

As a result, the convergence correction is performed in conjunction with the image rotation correction, and the occurrence of misconvergence due to the image rotation correction can be suppressed by the convergence correction coil.

[0009]

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

FIG. 3 is a side view, partially broken away, of a cathode ray tube device provided with a deflection yoke according to the present invention, wherein 1 is a deflection yoke according to the present invention, 2 is a horizontal deflection coil, 3 is a vertical deflection coil, 4 is a main core, 5 is a separator, 6 is a vertical auxiliary coil core, 7 is a vertical auxiliary coil, 8 is a terminal cover, 9 is an electron gun, 10 is a static convergence magnet, 11 is a tube of a cathode ray tube device, Reference numeral 12 denotes a fluorescent screen, 16 denotes a convergence correction coil, and 18 denotes an image rotation coil.

In FIG. 1, a deflection yoke 1 is attached to the neck of a cathode ray tube 11 having a fluorescent screen 12 on the front surface, and an electron gun 9 is attached to the tip of the neck of the cathode ray tube 11.

In this deflection yoke 1, a horizontal deflection coil 2
A main core 4 made of a magnetic material is arranged on the outer periphery of the vertical deflection coil 3, and a vertical auxiliary coil core 6 on which a vertical auxiliary coil 7 and a convergence correction coil 16 are wound is provided on the electron gun 9 side. Further, an image rotating coil 18 wound in a ring shape to correct a rotating component of the image is arranged on the fluorescent screen 12 side.

FIG. 1 is a cross-sectional view of a first embodiment of a modified yoke 1 according to the present invention, in which the vertical auxiliary coil core 6 is viewed from the fluorescent surface side, and 6a and 6b are the above vertical auxiliary coil cores. , 7a, 7b are the vertical auxiliary coils described above, 13
B, 13G and 13R are electron beams, 14 is a 4V correction magnetic field, 15B and 15R are deflection forces acting on the electron beams 13B and 13R, 16a to 16d are convergence correction coils, and 17a and 17b are convergence correction coil terminals. Parts corresponding to No. 3 are denoted by the same reference numerals.

In FIG. 1, a core 6 for a vertical auxiliary coil is provided.
Reference numerals a and 6b denote U-shaped magnetic bodies. One vertical auxiliary coil core 6a is located above the tube 11, the other vertical auxiliary coil core 6b is located below the tube 11, and the tube 11 is sandwiched between them. The vertical auxiliary coil cores 6a
One leg and two legs of the vertical auxiliary coil core 6b are both on the tube body 11 side. The vertical auxiliary coils 7a and 7b are wound around the vertical auxiliary coil cores 6a and 6b, respectively. When a vertical deflection current flows through the vertical auxiliary coils 7a and 7b, respectively, the auxiliary vertical A deflection magnetic field is generated.

Also, convergence correction coils 16a and 16b are provided on the respective legs of the upper vertical auxiliary coil core 6a.
Are wound, and convergence correction coils 16c and 16d are respectively attached to the legs of the lower vertical auxiliary coil core 6b.
Are wound, and these convergence correction coils 16a,
16b, 16c, 16d are coil terminals 17a, 17b
Are connected in series in that order.

Here, when a current flows between the coil terminals 17a and 17b, the convergence correction coils 16a and 16b
This current flows through b, 16c and 16d. This allows
The respective convergence correction coils 16a, 16b, 16
A magnetic field is generated from c and 16d. For the magnetic field generated from the convergence correction coil 16a, a magnetic path including the convergence correction coil 16a and the leg of the vertical auxiliary coil core 6a around which the convergence correction coil 16a is formed. A magnetic pole corresponding to the magnetic field generated by the convergence correction coil 16a is generated, and similarly, the convergence correction coils 16b, 16c, 16
Also for d, magnetic poles are formed at the ends of the legs of the vertical auxiliary coil cores 6a and 6b around which they are wound, but the ends of both ends of the vertical auxiliary coil cores 6a and 6b are respectively formed. The convergence correction coils 16a, 16b, 16c, and 16d are connected in series so that all the magnetic poles generated in the convergence correction coils 16a, 16b, 16c, and 16d have the same polarity (for example, N pole).

When a convergence correction current flows between the coil terminals 17a and 17b, the magnetic field generated by the convergence correction coils 16a, 16b, 16c and 16d generates a 4V correction magnetic field 14 as shown. Here, in the tube 11, an electron beam for green (hereinafter referred to as G
A blue electron beam (hereinafter, referred to as a B beam) 13B is provided on the left side of the center, and a red electron beam (hereinafter, referred to as an R beam) 13R is provided on the right side thereof.
Are positioned in-line, and the 4V correction magnetic field is directed to the right in the portion of the B beam 13B and to the right.
Each of the beams 13R has a leftward magnetic field.
There is almost no magnetic field in the portion of the G beam 13G.

Therefore, according to the framing left-hand rule, a downward deflection force 15B acts on the B beam 13B, and an upward deflection force 15R acts on the R beam 13R.
Works. No deflection force acts on the G beam 13G. As a result, the convergence of the red and blue horizontal lines can be adjusted.

Therefore, as shown in FIG. 2, in the color image displayed on the fluorescent screen 12 of the tube 11 of the cathode ray tube,
When misconvergence occurs such that the red horizontal line 19R due to the R beam 13R shifts downward with respect to the blue horizontal line 19B due to the B beam 13B, as described above, the 4 V
With the correction magnetic field, the B beam 13B has a downward deflection force 1
5B, an upward deflection force 1 is applied to the R beam 13R.
By receiving the action of 5R, the blue horizontal line 19B is displaced downward, and the red horizontal line 19R is displaced upward, and misconvergence is corrected.

When misconvergence in the opposite direction to that shown in FIG. 2 has occurred, a convergence correction current in the opposite direction may be applied to the convergence correction coils 16a to 16d.

FIG. 4 is a circuit diagram showing a second embodiment of the deflection yoke according to the present invention.
1 and 3 are denoted by the same reference numerals.

In FIG. 3, as shown in FIG. 3, the image rotating coil 18 provided on the fluorescent screen 12 is connected between the drive circuit 27 and the coil terminal 17a. 18 also convergence correction coil 1
6a to 16d are connected in series.

When the image rotating coil 18 is operated alone, the red and blue horizontal lines 19R, 1 as shown in FIG.
9B misconvergence occurs. The convergence correction coils 16a to 16d are maintained in such a manner as to cancel the misconvergence by, for example, appropriately setting the number of turns of the convergence correction coils 16a to 16d.
When the correction amount of the image rotation is changed by changing the current flowing therethrough, the red and blue horizontal lines 1 are connected in series.
Misconvergence between 9R and 19B does not occur. For example, if the current is increased and the correction amount of the image rotation is increased, the misconvergence amount due to this also increases,
The strength of the 4V magnetic field by the convergence correction coils 16a to 16d also increases, and this misconvergence can be corrected.

Of course, even if the direction of correction of the image rotation is reversed and the direction of the min convergence is reversed, the direction of flow of the correction current is reversed and the convergence correction coils 16a-1a
Since the direction of the 4V magnetic field by 6d is also reversed, this misconvergence can be similarly corrected.

FIG. 5 is a sectional view showing a third embodiment of the deflection yoke according to the present invention. Reference numerals 16e and 16f denote convergence correction coils, and portions corresponding to those in FIG. Description is omitted.

In the same figure, a convergence correction coil 16e is wound around the upper leg of the vertical auxiliary coil 6a over its two legs, and the lower vertical auxiliary coil core 6b is also wound on the lower vertical auxiliary coil core 6b. A convergence correction coil 16f is wound over the two legs, and the convergence correction coils 16e and 16f are arranged so that the magnetic field generated by the current flowing through them becomes the 4V correction magnetic field 14 in the direction shown in FIG. Also in this embodiment, both legs of the vertical auxiliary coil core 6a form a magnetic path of a magnetic field generated by the convergence correction coil 16e, and both legs of the vertical auxiliary coil core 6b are also generated by the convergence correction coil 16f. A magnetic path of a magnetic field is formed, and thereby, the magnetic field applied to the distal ends of both legs of the vertical auxiliary coil cores 6a and 6b is formed. Corresponding to but pole so that occurs, these auxiliary vertical coil core 6a, 6b equal polarities of such magnetic poles are all generated by the two legs (here the, S
Pole) are connected in series.

As a result, a rightward magnetic field is generated in the B beam 13B, a deflection force 15B acts on the B beam 13B downward, and a leftward magnetic field is generated in the R beam 13R. Thus, a deflection force 15R acts on the R beam 13R in an upward direction. Therefore, also in this case, the misconvergence shown in FIG. 2 can be corrected.

In the third embodiment as well, by reversing the direction of the convergence correction current flowing through the convergence correction coils 16e and 16f,
The reverse misconvergence can be corrected.

FIG. 6 is a sectional view showing a fourth embodiment of the deflection yoke 1 according to the present invention, wherein 16e 'and 16f' are convergence correction coils, and the portions corresponding to those in FIG. A duplicate description will be omitted.

In the same figure, a convergence correction coil 16e 'is disposed in a space between the legs on both sides of the upper vertical auxiliary coil core 6a, and the legs on both sides of the lower vertical auxiliary coil core 6b. The convergence correction coils 16f 'are also arranged in the space between them, and the 4V correction magnetic field 14 generated from the convergence correction coils 16e' and 16f 'by the current flowing therethrough is oriented in the direction shown in FIG. Correction coil 16
e ′ and the two legs of the vertical auxiliary coil core 6a form a magnetic path, and magnetic poles are formed at the tips of the two legs, and the convergence correction coil 16f ′ and the two legs of the vertical auxiliary coil core 6b. A convergence correction coil 16e ', 16f' is connected in series so that all the magnetic poles have the same polarity (N pole in the figure). ing.

As a result, the direction of the magnetic field at the B beam 13B is rightward, the B beam 13B is affected by the downward deflection force 15B, and the direction of the magnetic field at the R beam 13R is leftward. As a result, the R beam 13R receives the action of the upward deflection force 15R. Therefore, also in this case, misconvergence as shown in FIG. 2 can be corrected.

In the fourth embodiment, the reverse convergence current can be corrected by reversing the direction in which the convergence correction current flows through the convergence correction coils 16e 'and 16f'.

Also, in the third and fourth embodiments shown in FIGS. 5 and 6, as in the second embodiment shown in FIG.
Can be connected, and the same effect can be obtained.

FIG. 7 is a block diagram showing a display device provided with the cathode ray tube device to which the above-described deflection yoke 1 is attached. Reference numeral 20 denotes an input terminal for a video signal, reference numeral 21 denotes an input terminal for a horizontal synchronizing signal, and reference numeral 22. Is a vertical synchronizing signal input terminal, 23 is a video circuit, 24 is a horizontal deflection circuit, 25 is a vertical deflection circuit, 26 is a high voltage circuit, 28 is a convergence circuit, and 29 is an image rotation correction circuit. Are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 1, the display device comprises a video circuit 23, a horizontal deflecting circuit 24, a vertical deflecting circuit 25, a high voltage circuit 26, etc., and a convergence circuit 28 and an image rotation correcting circuit 29. .

A video signal is input from an input terminal 20, processed by a video circuit 23, and supplied to a cathode ray tube device. A horizontal synchronization signal is input from an input terminal 21 and supplied to a horizontal deflection circuit 24 to form a horizontal deflection current I _{H, which} is supplied to a horizontal deflection coil 2 of the deflection yoke 1. The horizontal synchronizing signal is supplied to a high voltage circuit 26, and a high voltage of the cathode ray tube device is generated. Input terminal 2
2 receives a vertical synchronization signal, which is supplied to a vertical deflection circuit 24 to form a vertical deflection current _{IV, which} is supplied to a vertical deflection coil 3 of the deflection yoke 1. Thus, the cathode ray tube device is driven.

The convergence correction coil 16 shown in FIG.
Are the convergence correction coils 16a to 16d in FIG.
And the convergence correction coils 16e, 16f,
The convergence correction coils 16e 'and 16f' in FIG.
When the convergence correction current is supplied from the convergence circuit 28 to the convergence correction coil 16, as described above,
A 4V correction magnetic field is generated to correct the min convergence.

Further, a rotation correction current is supplied from the image rotation correction circuit 29 to the image rotation coil 18, whereby the rotation of the image is corrected.

Of course, as shown in FIG. 4, the image rotation coil 18 and the convergence correction coil 16 are directly connected, and correction of image rotation and correction of misconvergence are performed by a correction current from one drive circuit 27. The correction may be made at the same time.

As described above, by applying the deflection yoke 1 according to the present invention to a display device, high-precision convergence of the display device can be realized.

[0041]

As described above, according to the present invention,
By providing a U-shaped vertical auxiliary coil core and arranging a convergence correction coil in this portion, it is possible to generate a 4V correction magnetic field, thereby enabling misconvergence correction.

Further, according to the present invention, by combining with the image rotation correction coil, misconvergence caused by the image rotation correction can be accurately corrected in conjunction with the image rotation correction. .

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of a deflection yoke according to a first embodiment of the present invention and its operation.

FIG. 2 is a diagram showing an example of a misconvergence pattern.

FIG. 3 is a side view showing a cathode ray tube device provided with a deflection yoke according to the present invention.

FIG. 4 is a circuit diagram showing a main part of a deflection yoke according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view showing a main part of a deflection yoke according to a third embodiment of the present invention and its operation.

FIG. 6 is an enlarged sectional view showing a main part of a deflection yoke according to a fourth embodiment of the present invention and its operation.

FIG. 7 is a configuration diagram illustrating an embodiment of a display device including a deflection yoke according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deflection yoke 2 Horizontal deflection coil 3 Vertical deflection coil 6a, 6b Core for vertical auxiliary coil 7a, 7b Vertical auxiliary coil 11 Tube body of cathode ray tube 12 Phosphor screen 13B, 13G, 13R Electron beam 14 4V correction magnetic field 15B, 15R Deflection force 16a to 16f Convergence correction coil 17a, 17b Convergence correction coil terminal 18 Image rotation coil 19R, 19B Red and blue horizontal lines 20 Video signal input terminal 21 Horizontal synchronization signal input terminal 22 Vertical synchronization signal input terminal 23 Video circuit 24 Horizontal deflection circuit 25 Vertical deflection circuit 26 High voltage circuit 27 Drive circuit 28 Convergence circuit 29 Image rotation correction circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobutaka Okuyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Division of Hitachi, Ltd. (72) Inventor Soichi Sakurai Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa No. 292, Hitachi, Ltd. Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Kunio Ishiyama 3300, Hayano, Mobara-shi, Chiba Pref., Electronic Devices Division, Hitachi, Ltd. (72) Inventor Takanori Ishikawa, Majo, Mizusawa, Iwate 1 Kitano Hitachi Media Electronics Co., Ltd.

Claims (6)

[Claims] 1. A deflection yoke which comprises a horizontal deflection coil, a vertical deflection coil and a core and is used by being attached to a cathode ray tube, wherein two U-shaped vertical auxiliary coil cores are provided on the electron gun side of the cathode ray tube. The two vertical auxiliary coil cores are disposed so as to be vertically opposed to each other with respect to the tube body of the cathode ray tube, and both legs of the two vertical auxiliary coil cores are on the tube side of the cathode ray tube. A convergence correction coil is wound for each unit, and the convergence correction coil is wound so that the magnetic poles generated at the tips of both legs of each of the vertical auxiliary coil cores by the magnetic field generated by the convergence correction coil have the same polarity. A deflection yoke connected to each other. 2. A deflection yoke comprising a horizontal deflection coil, a vertical deflection coil and a core, and used by being attached to a cathode ray tube, wherein two U-shaped vertical auxiliary coil cores are provided on the electron gun side of the cathode ray tube. The two vertical auxiliary coil cores are disposed so as to be vertically opposed to each other with respect to the tube body of the cathode ray tube, and both legs of the two vertical auxiliary coil cores are on the tube side of the cathode ray tube. The convergence correction coil is wound so as to surround the two legs, and the magnetic poles generated at the tips of the two legs of each of the vertical auxiliary coil cores by the magnetic field generated by the convergence correction coil have the same polarity. A deflection yoke, wherein the convergence correction coils are connected to each other. 3. A deflection yoke which comprises a horizontal deflection coil, a vertical deflection coil and a core and is used by being attached to a cathode ray tube, wherein two U-shaped vertical auxiliary coil cores are provided on the electron gun side of the cathode ray tube. The two vertical auxiliary coil cores are disposed so as to be vertically opposed to each other with respect to the tube body of the cathode ray tube, and both legs of the two vertical auxiliary coil cores are on the tube side of the cathode ray tube. A convergence correction coil is arranged in the space between the two legs, and the magnetic poles generated at the tips of the two legs of each of the vertical auxiliary coil cores by the magnetic field generated by the convergence correction coil have the same polarity. A deflection yoke, wherein the convergence correction coils are connected to each other. 4. The method according to claim 1, wherein a ring-shaped image rotation coil is arranged on the fluorescent screen side of the cathode ray tube, and the image rotation coil is connected to the convergence correction coil. Characteristic deflection yoke. 5. A cathode ray tube device comprising the deflection yoke according to claim 1, 2, 3, or 4. 6. A display device comprising the cathode ray tube device according to claim 5.