JP2000067776A - Deflection yoke device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke device with a simple structure allowing convergence of three emitted electron beams from cathodes disposed in a row, even in a peripheral part on a screen. SOLUTION: This deflection yoke device has two quadrupole coils 5, each of which has a structure such that an electric wire is wound around four parts of a core 3 in a toroidal shape. An end of one of the coils 5 is connected to a vertical deflection coil 2 through a diode connected in the positive direction to the end of that coil 5, while an end of the other coil 5 is connected to the vertical deflection coil 2 through another diode connected in the negative direction to the end of the other coil 5. Bobbins made of an insulating material such as plastic can be inserted in an upper end and a lower end of the wound core 3 with the quadrupole coil 5. Thereby, a mis-convergence occurring in diagonal directions is reduced by a magnetic field generated in the quadrupole coils 5 so that degradation of picture quality in a peripheral part of a screen is dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device to be combined with a cathode ray tube having three electron beams emitted from cathodes arranged in a horizontal line and used in a television receiver.

[0002]

2. Description of the Related Art In recent years, cathode ray tubes have been widely used for information equipment terminals such as computers, high definition televisions and the like. here,
An example of a color cathode ray tube device having three electron beams emitted from cathodes arranged in a horizontal line will be described.

FIG. 13 is a half side view of a conventional color cathode ray tube apparatus, FIG. 14 is a half side view of the deflection yoke apparatus, and FIG.
5 is a screen view of the cathode ray tube. The color cathode ray tube device
Generally, three electron beams emitted from an electron gun 22 in which red, green, and blue color cathodes are arranged in a horizontal line are deflected in a horizontal direction and a vertical direction by a deflection yoke device, and are deflected through a shadow mask. It is configured to reach the phosphor screen 24.

The deflection yoke device used in the color cathode ray tube device having the above-described configuration is, as shown in a half-cut side view in FIG. 14, wound with an electric wire and formed with a horizontal deflection coil 1 and a saddle-shaped contour. Similarly, the electric wire is wound, and the vertical deflection coil 2 formed into a saddle-shaped profile, the cylindrical core 3 divided into two, the insulation between the horizontal deflection coil 1 and the vertical deflection coil 2 are maintained, and the coils are held. Insulation frame 4
It is composed of

[0005] A saw-tooth wave current is supplied from a power source to each of the horizontal deflection coil 1 and the vertical deflection coil 2, and the electron beam is deflected by a magnetic field generated by the energization. In this case, since the magnetic field distribution from each of the horizontal deflection coil 1 and the vertical deflection coil 2 has a large effect on misconvergence, the magnetic field distribution of each coil is appropriately selected.

That is, to correct misconvergence, the horizontal deflection coil 1 is set to a pincushion magnetic field, and the vertical deflection coil 2 is set to a barrel magnetic field. In such a magnetic field distribution, the strength of the horizontal pincushion magnetic field increases as the distance from the center vertical axis (Y axis) to the left and right, and the three electron beams are deflected outward as the pincushion magnetic field is deflected outward. The trajectories of the center green electron beam, the red electron beam at both ends, and the blue electron beam of the three electron beams are corrected so that they concentrate on one point.

On the other hand, the strength of the vertical barrel magnetic field decreases as it moves vertically away from the central horizontal axis (X axis). At this time, since the electron beam is deflected in a direction perpendicular to the magnetic field lines, it receives a force in the horizontal direction (X direction) while being deflected in the vertical direction (Y direction). It is deflected away. As a result, misconvergence on the Y axis is corrected.

[0008]

In the conventional deflection yoke device configured as described above, the amount of misconvergence that can be corrected by the pincushion magnetic field from the horizontal deflection coil 1 and the barrel magnetic field from the vertical deflection coil is a moving image. For example, in a television broadcast screen, the amount is almost practically acceptable, but for a monitor or the like that displays characters and the like as still images, satisfactory convergence characteristics with high accuracy are obtained. There was a problem that can not be.

That is, as shown in FIG. 15, the three electron beams emitted from the cathodes arranged in a horizontal line are supplied to the central electron beam G at the center of the screen of the cathode ray tube.
Although the red electron beam and the blue electron beam at both ends coincide with the reen, the phenomenon that the trajectory of the red electron beam is always always located on the right side of the trajectory of the blue electron beam in the peripheral portion of the screen and is irradiated on the fluorescent screen,
For this reason, there has been a problem that the image quality in the peripheral portion of the screen is deteriorated.

The present invention has been made in consideration of the above-mentioned conventional problems, and has a simple structure in which three electron beams emitted from cathodes arranged in a horizontal line are made to coincide with each other even in the peripheral portion of the screen. It is an object of the present invention to provide a deflection yoke device which can be used.

[0011]

SUMMARY OF THE INVENTION The present invention provides a horizontal deflection coil and a vertical deflection coil for deflecting three electron beams emitted from cathodes arranged in a horizontal line, and a magnetic core for enhancing a magnetic field in the deflection coil. A deflection yoke device having a core as a coil, wherein a coil connected in series with the vertical deflection coil is a coil in which electric wires are wound around four portions of the core in a toroidal manner, and magnetic poles formed by the coils of each portion Has a four-pole coil, which is made by passing a current so that adjacent coils act in opposition to each other.

With this configuration, it is possible to realize a deflection yoke device which can make the three electron beams emitted from the cathodes arranged in a horizontal line coincide with each other even at the peripheral portion of the screen with a simple configuration.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is to enhance the magnetic fields of a horizontal deflection coil and a vertical deflection coil for deflecting three electron beams emitted from cathodes arranged in a horizontal line, and a deflection coil. A deflection yoke device having a core as a magnetic core, wherein a coil connected in series with the vertical deflection coil is a coil in which electric wires are wound around four parts of the core in a toroidal manner, The magnetic pole to be formed is a deflection yoke device characterized by arranging a four-pole coil formed by applying a current so that adjacent coils act in opposition.

According to a second aspect of the present invention, the four-pole coil wound in a toroidal shape around the core is wound in the vertical and horizontal directions of the core using two or multiple wires. A diode was connected to one end of the electric wire of the pole coil in the positive direction and the other end to the negative direction, and this was connected to the vertical deflection coil.

According to a third aspect of the present invention, in the four-pole coil wound around the core, an electric wire is wound around an electric wire guide made of an insulating material at an upper end and a lower end of the core.

According to a fourth aspect of the present invention, the electric wire guide has at least one of an upper surface, a lower surface, and a side surface.
A mountain cut or an uneven projection for fixing the position of the electric wire was provided at each location.

According to a fifth aspect of the present invention, the core is provided with a concave portion in a quadrupole coil portion, and an electric wire is wound around the concave portion.

According to the present invention, when the cathode ray tube is used as a monitor for displaying characters and the like, the above configuration reduces misconvergence occurring in the diagonal direction, eliminates the inconvenience of deteriorating the image quality at the periphery of the screen, and eliminates the problem. At
A deflection yoke device capable of obtaining satisfactory convergence characteristics with high precision can be realized.

(Embodiment 1) FIG. 1 is a half side view of a deflection yoke device according to Embodiment 1 of the present invention, and FIG. 2 (a) is a front view of the deflection yoke device with only a 4-pole coil and a core taken out. FIG. 2B is a side view showing only the four-pole coil and the core of the deflection yoke device, FIG. 3 is a wiring diagram of the deflection yoke device, FIG. 4 is a sectional view of the deflection yoke device, and FIG.
FIG. 6 is a diagram of a deflection magnetic field generated by a horizontal deflection coil of the deflection yoke device, FIG. 6 is a diagram illustrating a pin cushion magnetic field component of a vertical deflection coil of the deflection yoke device, and FIG. The trajectory is Blue
FIG. 8 is a screen view of a cathode ray tube having a misconvergence pattern located on the right side of the trajectory of the electron beam. FIG. 8 is an explanatory view of a magnetic field generated by a quadrupole coil of the deflection yoke device.
Is an explanatory view of a barrel magnetic field component of the vertical deflection coil of the deflection yoke device, and FIG. 10 is a deflection distortion (deflection defocusing) diagram of an electron beam spot of the deflection yoke device.

In FIG. 1, the quadrupole coils are arranged outside a horizontal deflection coil 1 arranged vertically and a vertical deflection coil 2 arranged left and right. It is wound in a toroidal shape around a core 3 arranged so as to surround it. In order to explain the four-pole coil of the deflection yoke device configured as described above,
Only the pole coil 5 and the core 3 are taken out, and a front view is shown in FIG. 2A and a side view is shown in FIG. Where 6 is 4
The four-pole coil according to the present invention is provided with four poles at the upper and lower sides, four right and left opposing positions of the core 3, and an angle of 90 ° between adjacent quadrupole coils.
Is wound around the core 3 in a toroidal shape. In the present embodiment, the electric wire 6 is wound 16 times at each position, and the winding direction is wound substantially parallel to the X axis 7 or the Y axis 8.

Next, the wiring of the deflection yoke device configured as shown in FIG. 1 will be described with reference to FIG. The horizontal deflection coil 1 connects a coil 1a disposed on the upper side and a coil 1b disposed on the lower side in parallel, and connects it to a horizontal deflection power supply 9. The vertical deflection coil 2 has a coil 2a arranged on the left side and a coil 2b arranged on the right side connected in series, and has one end connected to the high voltage side of the vertical deflection power supply 10 and the other end connected to two diodes 11a, 11b. Through the 4-pole coil 5 (5
a, 5b), and the terminal of the four-pole coil is connected to the low voltage side of the vertical deflection power supply 10. The quadrupole coil is a so-called quadrupole coil in which two quadrupole coils called bifilar winding or two multiples of the electric wire are formed and connected in parallel. That is, two quadrupole coils (5a and 5b) are connected in parallel.

The two diodes are connected to each of the quadrupole coils, and are connected to a diode 11a which flows when the AC current flowing through the vertical deflection coil is positive and a diode 11b which flows when the AC current flowing through the vertical deflection coil is negative. Have been. The state of the magnetic field for deflecting three electron beams by passing a current through the deflection yoke device configured as described above will be described below, taking the case of deflecting the electron beam in the upper right direction as an example.

FIG. 4 is a sectional view taken along the line AA 'of FIG. In this figure, from the inner circumference, the horizontal deflection coil 1 → the insulating frame 4 →
It can be seen that the vertical deflection coil 2 is assembled with the core 3. However, a quadrupole coil 5 is wound around the x-axis and the y-axis on the core 3, and the south pole is located at the upper right corner of the diagonal and the north pole is located at the upper left corner of the diagonal
It is assumed that current is flowing so that a pole is formed at the lower left of the diagonal, and an S pole is formed at the lower right of the diagonal.

First, since the deflection magnetic field generated by the horizontal deflection coil 1 is a pincushion magnetic field such as the magnetic field line φH shown in FIG. 5A, the magnetic field lines in the vertical direction contributing to the deflection shown in FIG. The magnetic field lines and the horizontal auxiliary magnetic field lines contributing to convergence are considered separately. Next, considering the virtual magnetic pole generated by the auxiliary magnetic field lines, and then considering the convergence at the time of the right half deflection of the screen generated by the virtual magnetic field lines generated by the virtual magnetic pole, as shown by the white arrow shown in FIG. Red at both ends with a gun
The electron beam 12 and the blue electron beam 13 receive a force in a direction in which the electron beam 12 and the blue electron beam 13 are separated from each other, and are deflected in the horizontal direction.

Next, in the present invention, the deflection magnetic field generated by the vertical deflection coil 2 has a barrel magnetic field amount smaller than that of the conventional technique, and is rather a pincushion magnetic field depending on the type of the cathode ray tube. That is, even if it is a barrel magnetic field, it is considered that the pincushion magnetic field is added to the barrel magnetic field, and the pincushion magnetic field component of the vertical deflection coil 2 will be described below. Therefore, the magnetic field lines are divided into a horizontal magnetic field line contributing to deflection and a vertical auxiliary magnetic field line contributing to convergence shown in FIG. Next, consider the virtual magnetic poles generated by the auxiliary magnetic flux lines, and then consider the convergence of the virtual magnetic fluxes generated by the virtual magnetic flux lines. As shown by the white arrows shown in FIG. Red electron beam 1
2. The blue electron beam 13 receives a force in a direction to separate from each other and is deflected in a vertical direction.

As described above, in the cathode ray tube screen where the horizontal deflection magnetic field to be separated and the vertical deflection magnetic field to be separated exist, as shown in FIG. 7, near the horizontal (X) axis 7, the red electron beam and the blue electron The trajectories of the beams match, but near the vertical (Y) axis 8, Red
The electron beam draws a trajectory such that the electron beam is located on the right side of the blue electron beam, and in the diagonal direction, the horizontal magnetic field and the vertical magnetic field are added together. Locus is Blu
A misconvergence pattern such as that located on the right side of the trajectory of the e-electron beam is obtained.

Next, a correction magnetic field is applied by a four-pole coil. As shown in FIG. 8, the magnetic field generated by the quadrupole coil has a function of separating the Red electron beam and the Blue electron beam from each other. Further, since this quadrupole coil is connected in series to the vertical deflection coil 2 as described above, the effect is increased as the amount of vertical deflection increases.

That is, the vertical deflection coil 2 described in the prior art is used as a barrel magnetic field to adjust the misconvergence on eight vertical (Y) axes, whereas the deflection yoke device of the present invention uses a four-pole coil. This is to adjust misconvergence on the vertical (Y) axis 8. The difference between adjusting the misconvergence on the vertical (Y) axis 8 with the magnetic field distribution of the vertical deflection coil according to the prior art and adjusting the misconvergence with the quadrupole coil will be described below.

First, a method of adjusting the misconvergence on the vertical (Y) axis 8 by using a vertical deflection coil as a barrel magnetic field is performed when the deflection direction of the electron beam is vertical as shown in FIG. Has a symmetrical magnetic curve such that the action on the electron beams at both ends is the same, but if the electron beam is diagonal, as shown by the dotted line in the figure, the magnetic curve acting on the electron beams at both ends Therefore, as described in the above-mentioned conventional technique, misconvergence of vertical lines is generated in the diagonal direction on the screen of the cathode ray tube.

On the other hand, when the misconvergence on the vertical (Y) axis 8 is adjusted using the quadrupole coil of the present invention, the magnetic field is the same for the electron beams at both ends as shown in FIG. Since it has a magnetic curve only in the vertical direction that gives an effect, even if the deflection direction of the electron beam is diagonal, for example, the effect affecting the left and right electron beams does not differ. Therefore, substantially the same effect can be obtained both in the vertical direction and the diagonal direction on the cathode ray tube screen, and there is no occurrence of misconvergence in the diagonal direction as shown in the related art.

Next, in order to adjust with the magnetic field distribution of the vertical deflection coil 2, the barrel magnetic field must be set as described in the prior art. For this purpose, deflection distortion of the electron beam spot (deflection Defocusing) also occurs. That is, a force that deforms the electron beam indicated by a white arrow as shown in FIG. 10 acts on the electron beam, and the electron beam includes a vertically long halo portion due to the flatness of the cathode ray tube screen and a horizontally long core portion due to deflection distortion. It has the shape of a beam.

On the other hand, when the correction is performed by a four-pole coil, there is no force for deforming the electron beam in the deflection of the electron beam. Therefore, as shown in FIG. As a result, the cathode ray tube screen by the deflection yoke device of the present invention has a good spot shape of the electron beam, that is, it can provide a cathode ray tube screen with good focus in appearance. is there.

(Embodiment 2) FIG. 11 is a front view of a deflection yoke device according to Embodiment 2 of the present invention. In order to wind a four-pole coil, plastic is molded at the upper and lower ends of a core. The wire guide 14 is inserted into the core.
The wire guide 14 has an upper surface 15 and a lower surface 1.
6. On the side surface 17, a groove for stabilizing the position of the electric wire is formed.

When the electric wire for a four-pole coil is wound around the electric wire guide having such a ridge, the position of the electric wire is stabilized. That is, the electric wire is wound around the valley (recessed portion) of the electric wire guide, the movement is prevented by the ridge of the electric wire guide, and the electric wire is not wound around the adjacent valley.

(Embodiment 3) FIG. 12A is a front view of a deflection yoke device according to Embodiment 3 of the present invention, and FIG.
Is a side view showing a core for winding a four-pole coil.

In this embodiment, a concave portion is provided in the four-pole coil winding portion of the core, and an electric wire is wound around the concave portion. That is, the core upper end recess 18 and the core lower end recess 1
9, a core outer side recess 20 and a core inner side recess 21 are constructed. Therefore, in the present embodiment, it is rare that the electric wire escapes from the concave portion by winding the electric wire in the concave portion.

Further, by providing the concave portion in the core, the definition of the angle between adjacent coils required by the quadrupole coil becomes clear, and the variation in the magnetic field of the quadrupole coil can be drastically reduced. Also, by assembling the four-pole coil with the vertical deflection coil in a state where the four-pole coil wire protrudes from the core, the four-pole coil wire does not come into contact with the vertical deflection coil and the wire is not damaged.

[0038]

As described above, the deflection yoke device of the present invention is a coil connected in series with a vertical deflection coil, and the coil is formed by winding an electric wire in a toroidal shape around four portions of the core. None, the magnetic poles made by the coils of each part are configured by adding a four-pole coil made by passing an electric current so that adjacent coils work in opposition.
The pole coil is wound in the vertical and horizontal directions of the core using two or multiple wires, and a diode is connected to one end of the wire of the quadrupole coil in the positive direction and the other end to the negative direction. It is a configuration connected to a vertical deflection coil,
The four-pole coil wound around the core has a structure in which an electric wire is wound around a winding frame made of an insulating material such as plastic at the upper and lower ends of the core. The configuration in which the electric wire is wound around the concave part reduces misconvergence that occurs in the diagonal direction, eliminates the inconvenience of deteriorating the image quality in the peripheral portion of the screen, and uses the cathode ray tube as a monitor for displaying characters and the like. Even in such a case, satisfactory and accurate convergence characteristics can be obtained, and a quadrupole coil can be stably disposed by providing a core wire guide or forming a recess in the core.

[Brief description of the drawings]

FIG. 1 is a half-cut side view of a deflection yoke device according to a first embodiment of the present invention.

FIG. 2A is a front view of the deflection yoke device according to the first embodiment of the present invention, in which only the four-pole coil and the core are taken out. FIG. 2B is a front view of the deflection yoke device according to the first embodiment of the present invention. Side view with only

FIG. 3 is a wiring diagram of the deflection yoke device according to the first embodiment of the present invention.

FIG. 4 is a sectional view of the deflection yoke device according to the first embodiment of the present invention;

FIG. 5 is a deflection magnetic field diagram by a horizontal deflection coil of the deflection yoke device according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating a pincushion magnetic field component of the vertical deflection coil of the deflection yoke device according to the first embodiment of the present invention.

FIG. 7 shows Re of the deflection yoke device according to the first embodiment of the present invention.
A screen image of a cathode ray tube having a misconvergence pattern in which the trajectory of the d electron beam is located on the right side of the trajectory of the Blue electron beam

FIG. 8 is an explanatory diagram of a magnetic field generated by the four-pole coil of the deflection yoke device according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram of a barrel magnetic field component of a vertical deflection coil of the deflection yoke device according to the first embodiment of the present invention.

FIG. 10 is a diagram showing deflection distortion (deflection defocusing) of an electron beam spot in the deflection yoke device according to the first embodiment of the present invention.

FIG. 11 is a front view of a deflection yoke device according to a second embodiment of the present invention.

12A is a front view of a deflection yoke device according to a third embodiment of the present invention. FIG. 12B is a side view of the deflection yoke device according to the third embodiment of the present invention.

FIG. 13 is a half side view of a conventional color cathode ray tube device.

FIG. 14 is a half-cut side view of a conventional deflection yoke device.

FIG. 15 is a screen diagram of a conventional cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal deflection coil 2 Vertical deflection coil 3 Core 4 Insulation frame 5a, 5b 4-pole coil 6 Electric wire 7 X axis 8 Y axis 9 Horizontal deflection power supply 10 Vertical deflection power supply 11a, 11b Diode 15 Upper surface of electric wire guide 16 Lower surface of electric wire guide 17 Side surface of electric wire guide 18 Core upper concave portion 19 Core lower concave portion 20 Core outer concave portion 21 Core inner concave portion

Claims (5)

[Claims] 1. A deflection yoke including a horizontal deflection coil and a vertical deflection coil for deflecting three electron beams emitted from cathodes arranged in a horizontal line, and a core as a magnetic core for strengthening a magnetic field of the deflection coil. An apparatus, wherein coils connected in series with the vertical deflection coil are coils obtained by winding electric wires in a toroidal shape around four parts of the core, and the magnetic poles formed by the coils of each part are such that adjacent coils A deflection yoke device comprising a four-pole coil formed by flowing a current so as to act in opposition to each other. 2. A four-pole coil wound around the core in a toroidal shape, using two or multiple wires thereof, wound in the vertical and horizontal directions of the core, and one end of the wire of the four-pole coil. 2. The deflection yoke device according to claim 1, wherein a diode is connected in the positive direction and the other end is connected in the negative direction, and the diode is connected to a vertical deflection coil. 3. The four-pole coil wound around the core has wires wound around wire guides made of an insulating material at upper and lower ends of the core. Deflection yoke device. 4. The electric wire guide has an upper surface or a lower surface,
4. The deflection yoke device according to claim 3, wherein at least one of the side surfaces is provided with a mountain cut or an uneven projection for fixing the position of the electric wire. 5. The deflection yoke device according to claim 1, wherein the core is provided with a concave portion in a quadrupole coil portion, and an electric wire is wound around the concave portion.