JP2637690B2 - Deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke,
In particular, a stray capacitance between a horizontal deflection coil (hereinafter abbreviated as "H coil") and a vertical deflection coil (hereinafter abbreviated as "V coil").
And the ringing phenomenon (ringing phenom) generated by the stray capacitance between the vertical deflection coil and the ferrite core.
The present invention relates to a deflection yoke in which a non-magnetic conductor is additionally attached to a vertical deflection coil to improve enon).

[0002]

2. Description of the Related Art Generally, a deflection yoke mounted on the rear surface of a cathode ray tube of a television or a monitor is divided into a saddle-saddle type deflection yoke, a saddle-annular type deflection yoke and a bobbin type deflection yoke. Each deflection yoke determines the structure of a vertical deflection coil for deflecting the electron beam in the vertical direction of the screen, a horizontal deflection coil for deflecting the electron beam in the horizontal direction of the screen, and the structure of the deflection yoke. A coil separator and a magnetic material for increasing the deflection force, that is, a ferrite core are mounted.

The general structure of a deflection yoke will be described below with reference to FIG. As shown in FIG. 5, the deflection yoke 1 has a deflection yoke 1 inside a coil separator 2.
A pair of saddle-shaped H coils 3 is mounted on the upper and lower sides with respect to the horizontal axis of the pair, and a pair of saddle-shaped vertical deflections is provided outside the coil separator 2 to the left and right with respect to the horizontal axis of the deflection yoke 1. A coil 4 is mounted, and a pair of ferrite cores 5 are mounted so as to cover the vertical deflection coil 4 from outside. In addition, a pair of ferrite cores 5
Are fixed by a core clamp (not shown).

The deflection yoke 1 having such a configuration is mounted behind the cathode ray tube.
6A, a sawtooth waveform current (see FIG. 6B) is applied to the horizontal deflection coil 3 and the vertical deflection coil 4 of the deflection yoke 1 respectively. The horizontal deflection coil 3 and the vertical deflection coil 4 generate respective deflection magnetic fields.

That is, the electron beams R, G and B scanned through the center of the deflection yoke 1 are caused by horizontal and vertical deflection magnetic fields generated from the horizontal deflection coil 3 and the vertical deflection coil 4, respectively, as shown in FIG. As shown in (1), one image is formed by deflection scanning in the horizontal and vertical directions.

However, in the deflection yoke configured as described above, as shown in FIG. 7, the interval between the horizontal deflection coil 3 and the vertical deflection coil 4 and the interval between the vertical deflection coil 4 and the ferrite core 5 are very large. Due to the narrowness, a certain amount of magnetic force and electric force are generated between the horizontal deflection coil 3 and the vertical deflection coil 4 or between the vertical deflection coil 4 and the ferrite core 5.

Here, the generation of the magnetic force is the same as the principle of the transformer which is a known technique. That is, as shown in FIG. 8, when the voltage V1 is supplied to the horizontal deflection coil 3 and the current starts to flow, the horizontal deflection coil 3 is turned into the vertical deflection coil 4 by the winding ratio of the horizontal deflection coil 3 and the vertical deflection coil 4. A constant value of magnetic field is induced. If this is expressed by a formula, it is as the following equation 1.

V = L × di / dt (1) where V represents voltage and L represents the inductance of the coil.

The generation of an electric force causes a floating capacitance between the horizontal deflection coil 3 and the vertical deflection coil 4 and between the vertical deflection coil 4 and the ferrite core 5 as shown in FIG. The floating capacitance is generated because the horizontal deflection voltage V1 is much larger than the vertical deflection voltage V2, so that a difference between the two voltages is generated. That is, the horizontal deflection voltage V1 is -2.
The vertical deflection voltage V2 is in the range of 0 to 20 [V], while the range is 0 to 1000 [V]. Therefore, since the voltage difference between the two voltages is very large, a fixed amount of electric charge exists between the two coils 3 and 4 as in the principle of the capacitor. This can be expressed by the following equation (2).

[0010]

Q (electric charge) = C (capacitance) × V (voltage) (2) In the horizontal deflection coil 3 and the vertical deflection coil 4,
Since the coils 3 and 4 are arranged adjacent to each other, a floating capacitance having an electric force is generated for each coil 3 and 4.

Since such floating capacitance is distributed irregularly throughout the horizontal deflection coil 3 or the vertical deflection coil 4, the horizontal deflection coil 3 and the vertical deflection coil 4
Has an effect on the sawtooth waveform current applied thereto. As described above, when the magnetic force and the electricity affect the sawtooth waveform current applied to the horizontal deflection coil 3 and the vertical deflection coil 4, the irregular waveform A as shown in FIG. Occurs, and as shown in FIG. 9 (C), the electron beam is scanned irregularly in the left portion of the screen to generate a black-and-white band. This is called a ringing phenomenon.

A structure for improving such a ringing phenomenon is disclosed in JP-A-58-34549.
According to this conventional example, as shown in FIG. 10, the center tap 6 is pulled out from the center of the vertical deflection coil 4, and this center tap 6 is connected to the start terminal V _S and the final terminal V _S.
A damping braking resistor 7 of about several KΩ between _F ,
8 connected.

The conventional deflection yoke thus configured can dampen resonance development caused by the inherent inductance of the vertical deflection coil 4 and the floating capacitance existing in the vertical deflection coil 4, so that the resonance current due to the pulse voltage is reduced. Ringing is improved.

However, when the vertical deflection coil 4 of the deflection yoke 1 is wound, the existing winding device is operated to wind the vertical deflection coil 4 by half, and then the winding device is stopped and the worker is stopped. After pulling out the leading part of the vertical deflection coil 4 on which the wire is wound and fixing it to one end of the ring, the winding device must be operated again to wind the remaining half of the vertical deflection coil 4. In this case, there is a problem that the process of extracting the center tap of the vertical deflection coil is very complicated, and the operation time is extremely long.

Further, when a winding device capable of extracting the center tap of the vertical deflection coil is used, there is a problem that a cost for purchasing a separate winding device is required.

Japanese Patent Application Laid-Open No. 61-104544 discloses a thin conductive member 9 from the surface of the upper and lower coils of the horizontal deflection coil 3, that is, from the start terminal of the coil to the vicinity of the center, as shown in FIG. Each of the adhesives is disclosed.

According to this conventional example, since one conductive member 9 is adhered to each of the left and right sides of the upper coil and one each to the left and right sides of the lower coil, four conductive yokes are provided in one deflection yoke. The member 9 is adhered. In the conventional deflection yoke having such a configuration, the induced charges of the stray capacitances unequally distributed in the horizontal deflection coil 3 are exchanged with each other by the conductive member 9, and thus are distributed along the horizontal deflection coil 3. The ringing can be improved by making the induced charges uniform.

However, in such a case, if a voltage is applied to the horizontal deflection coil to which the conductive member is adhered, a horizontal deflection magnetic field generated by the applied voltage is induced to the conductive member, and the magnetic field is generated by the magnetic field. A current in a direction perpendicular to the direction is generated, and the horizontal deflection current decreases. Therefore, the amplitude of the horizontal deflection decreases, and the current generated by the conductive member generates Joule heat to heat the conductive member, and the heat changes the characteristics of the deflection yoke.

[0019]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to attach a non-magnetic conductor to a pair of vertical deflection coils, connect the non-magnetic conductor to a ground terminal using a lead wire, and perform horizontal deflection. By causing the induced charge due to the stray capacitance generated between the coil and the vertical deflection coil and between the vertical deflection coil and the ferrite core to flow directly to the ground through this non-magnetic conductor, it is removed.
It is an object of the present invention to provide a deflection yoke in which occurrence of ringing is suppressed.

[0020]

In order to achieve the above object, the present invention provides a coil separator forming a form of a deflection yoke, and a coil separator disposed inside the coil separator to deflect an electron beam in a horizontal direction. A pair of horizontal deflection coils for generating a deflection magnetic field, a pair of vertical deflection coils arranged outside the coil separator to generate a deflection magnetic field for deflecting an electron beam in a vertical direction, and for increasing a deflection force. In a deflection yoke provided with a ferrite core, which is a magnetic material, mounted so as to cover the outside of the vertical deflection coil, the screen deflection portion of each of the pair of vertical deflection coils is configured to cover each vertical deflection coil from outside. Mounted between the horizontal deflection coil and the vertical deflection coil, and between the vertical deflection coil and the ferrite core A non-magnetic conductor that generates the floating capacitance in place of the vertical deflection coil, and the non-magnetic conductor is connected to the end of the winding of the vertical deflection coil so that the non-magnetic conductor is induced by the floating capacitance. And a lead wire through which electric charge flows directly to the ground.

A nonmagnetic conductor is provided at each of a screen vent portion and a neck vent portion of the vertical deflection coil.
You may attach it individually. Here, the screen vent portion and the neck vent portion are respectively crossing lines before and after the vertical deflection coil. That is, the screen vent is a curved portion of the vertical deflection coil formed in a circular shape along the outer peripheral edge of the coil separator on the screen side. The neck vent is a curved portion of the vertical deflection coil formed in a circular shape along the outer peripheral edge of the coil separator on the end side of the cathode ray tube neck.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a deflection yoke according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing an embodiment of a deflection yoke according to the present invention. In FIG. 1, the same components as those shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 1 to 3, the non-magnetic conductors 10 are attached to the respective vertical deflection coils 4 so as to cover the screen vents of the pair of vertical deflection coils 4 one by one. This non-magnetic conductor 1
A lead wire 11 is connected to the terminal 0, and this lead wire 11 is connected to the final terminal VF of the vertical deflection coil 4 formed on the terminal board 12, that is, the winding end of the vertical deflection coil 4. Here, the final terminal VF of the vertical deflection coil 4 corresponds to the ground terminal of the deflection yoke 1, and the voltage value of this terminal is almost close to 0 [V].
In this case, the nonmagnetic conductor 10 can be considered to be grounded.

In the deflection yoke 1 having such a configuration, the floating capacitance that the vertical deflection coil bears is removed according to the principle shown in FIG. 4, and the non-magnetic conductor bears this instead.

That is, referring to Equation 3 in order to obtain the charge amount of the floating capacitance,

(Equation 2) become. Where ξ is the specific induction ratio, S is the area of the derivative, d
Indicates the thickness of the derivative. That is, since the floating capacitance amount C shows a relationship proportional to the area S of the derivative, if the area S of the derivative is reduced to almost zero, the floating capacitance amount C is also reduced to almost zero.

As described above, the stray capacitance C is
Since the area S of the derivative (corresponding to the horizontal deflection coil 3, the vertical deflection coil 4, and the ferrite core 5) is related to the size of the derivative, if the area S of the derivative is reduced, the stray capacitance C is inevitable. To decrease.

Therefore, if the non-magnetic conductor 10 is attached to the vertical deflection coil 4 in order to reduce the area S of the dielectric, and this non-magnetic conductor 10 is connected to the ground, the space between the horizontal deflection coil 3 and the vertical deflection coil 4 and The induction capacitance corresponding to the size of the nonmagnetic conductor 10 in the induction capacitance generated between the vertical deflection coil 4 and the ferrite core 5 is induced by the nonmagnetic conductor 10 and
, The area of the dielectric is reduced by the area of the non-magnetic conductor 10. Therefore, the amount of stray capacitance that causes the ringing phenomenon is reduced, so that the ringing phenomenon can be improved.

In such a deflection yoke 1, the nonmagnetic conductor 10 is attached to a screen vent or a neck vent which is not directly affected by the vertical deflection magnetic field. The screen vent portion and the neck vent portion are portions that constitute the crossover portion of the vertical deflection coil, and are not intended to generate a vertical deflection magnetic field that is responsible for vertical deflection scanning, but due to the structure, the vertical deflection magnetic field that performs scanning. Is a small part of the electromagnetic interaction. In addition, a magnetic field is generated around the vertical deflection coil from the front and rear lines, and this magnetic field induces a current in the non-magnetic conductor attached around the coil, which reduces the amplitude of the generated magnetic field. Is caused by the interaction between the crossover portion and the non-magnetic conductor, and does not directly affect or affect the vertical deflection magnetic field for performing the deflection scanning.
Therefore, since the amplitude of the vertical deflection magnetic field does not decrease and there is no fear that the deflection yoke 1 is overheated by the non-magnetic conductor 10, such a deflection yoke 1 is very stable and can be used efficiently. it can.

[0030]

As described above, according to the deflection yoke according to the present invention, the non-magnetic conductor is attached to the vertical deflection coil and the non-magnetic conductor is grounded, so that the horizontal deflection coil and the vertical deflection coil or the vertical deflection coil or the vertical deflection coil are grounded. Even if the deflection coil and the ferrite core are arranged adjacent to each other, the ringing phenomenon can be improved because the induced charge due to the generated floating capacitance is directly passed to the ground, that is, flows out.

According to the deflection yoke of the present invention, since the nonmagnetic conductor is attached to the screen vent or the neck vent which is not directly affected by the vertical deflection magnetic field, the amplitude does not decrease, and The nonmagnetic conductor does not overheat the deflection yoke.

[Brief description of the drawings]

FIG. 1 is a front view of a deflection yoke according to the present invention.

FIG. 2 is a partial detailed view of a deflection yoke according to the present invention.

FIG. 3 is a partial detailed view of a deflection yoke according to the present invention.

FIG. 4 is a drawing for explaining the principle of the deflection yoke of FIG. 1;

FIG. 5 is an exploded perspective view of a conventional saddle-saddle type deflection yoke.

6 (A) is a voltage waveform diagram applied to horizontal and vertical deflection coils, and FIG. 6 (B) is a sawtooth waveform diagram applied to horizontal and vertical deflection coils. (C) is a state diagram in which the electron beam is scanned on the screen.

FIG. 7 is a lower sectional view of a conventional saddle-saddle type deflection yoke.

FIG. 8 is an equivalent circuit diagram of FIG. 7;

9A is a waveform diagram of a voltage applied to the horizontal and vertical deflection coils, FIG. 9B is a sawtooth waveform diagram in a state where a ringing phenomenon has occurred, and FIG. ) Is FIG.
FIG. 6B is a state diagram in which the electron beam is scanned on the screen by (B).

FIG. 10 is a schematic configuration diagram showing a conventional deflection yoke for improving a ringing phenomenon.

FIG. 11 is a schematic configuration diagram showing a conventional deflection yoke.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deflection yoke 2 Coil separator 3 Horizontal deflection coil 4 Vertical deflection coil 5 Ferrite core 10 Nonmagnetic conductor 11 Lead wire

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-160640 (JP, A) JP-A-63-62139 (JP, A) JP-A-62-281242 (JP, A) JP-A-62-281242 198040 (JP, A) JP-A-60-31334 (JP, A)

Claims (2)

(57) [Claims] A coil separator forming a deflection yoke; a pair of horizontal deflection coils disposed inside the coil separator to generate a deflection magnetic field for deflecting an electron beam in a horizontal direction; And a pair of vertical deflection coils for generating a deflection magnetic field for deflecting the electron beam in the vertical direction, and mounted to cover the outside of the vertical deflection coil to increase the deflection force. In a deflection yoke including a ferrite core that is a magnetic material, each vertical deflection coil is attached to a screen vent portion of the pair of vertical deflection coils so as to cover the vertical deflection coils from outside, and between a horizontal deflection coil and a vertical deflection coil, and vertically. The stray capacitance generated between the deflection coil and the ferrite core is applied to the vertical deflection coil. In addition, a non-magnetic conductor and a non-magnetic conductor are connected to the end of the winding of the vertical deflection coil so that the induced charge due to the floating capacitance carried by the non-magnetic conductor flows directly to the ground. A deflection yoke comprising: a lead wire; 2. The two non-magnetic conductors are attached to a screen vent and a neck vent of a pair of vertical deflection coils, respectively.
A deflection yoke as described.