JP3446089B2 - Deflection yoke device - 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 device combined with a cathode ray tube used in a television receiver or the like.

[0002]

2. Description of the Related Art In recent years, various correction circuits for reducing misconvergence in a deflection yoke device have been invented in response to a demand for higher precision of a television receiver (for example, Japanese Patent Laid-Open No. 3-283238). See the bulletin).

A conventional deflection yoke device will be described below. As shown in FIGS. 10 and 11, the current flowing in the horizontal deflection coil including the upper horizontal deflection coil (hereinafter, referred to as upper coil) 1 and the lower horizontal deflection coil (hereinafter, referred to as lower coil) 2 is changed. The provided convergence correction device is composed of a permanent magnet (hereinafter referred to as a magnet) 3, a first coil 4, a second coil 5, and a U-shaped magnetic core 6 into which the first coil 4 and the second coil 5 are inserted and attached. is, and winding end F ₂ of the upper coil 1 winding start S ₁ and the lower coil 2 is short-circuited, and the winding start S ₂ of the upper coil 1 winding end F ₁ and the lower coil 2 are each a The first coil 4 and the second coil 5 are connected to each other, and the opposite sides of the first coil 4 and the second coil 5 connected to the horizontal deflection coil are short-circuited.
The point where the winding start S ₁ and the winding end F ₂ of the lower coil 2 are short-circuited can be connected to an external deflection power supply circuit.

Therefore, by changing the magnetic bias by changing the current flowing through the first coil 4 and the second coil 5 to which the magnetic bias is applied by the magnet 3, the current flowing through the upper coil 1 and the lower coil 2 becomes different. Can have

The operation when the horizontal deflection current for convergence correction is positive will be described below. As shown in FIG. 12A, the magnetic flux φ1 is generated in the first coil 4 in the direction indicated by the dotted arrow, and the magnetic flux φ2 is generated in the second coil 5 in the direction opposite to the magnetic flux φ1. Is wired to. At this time, the direction of the magnetic flux φm of the magnet 3 shown by the dotted U-shape is the same as the magnetic flux φ1 of the first coil 4.

Therefore, the first coil 4 has (magnetic flux φ1
A magnetic flux of + magnetic flux φm) is generated, and (the magnetic flux φ
2-magnetic flux φm), which causes the inductance of the first coil 4 to decrease and the inductance of the second coil 5 to increase.

However, as shown in FIG. 13, in the current superposition characteristic of the inductance, which is the magnetic saturation characteristic of this magnetic circuit, since the magnetic fluxes of the first coil 4 and the second coil 5 are in opposite directions, the first coil 4 Even if an attempt is made to increase the current flowing in the second coil 5 to increase the magnetic flux generated thereby to saturate the magnetic core 6, the current flowing in the second coil 5 also increases and is offset by the magnetic flux generated in the opposite direction. The magnetic core 6 is not saturated, and eventually the magnetic core 6 is saturated only by the magnetic bias by the magnet 3. Therefore, the magnetic saturation characteristic (current-inductance characteristic) of this convergence correction device is as shown in FIG. And the magnetic flux is saturated only on the side having the same direction (that is, when the positive scanning current is applied).

Therefore, when the horizontal deflection current is positive, that is, when the lines of magnetic force go from top to bottom, the normal operation is the same as when the magnetic bias from the magnet 3 is not applied to the first coil 4, but the second operation is performed. It is difficult for current to flow through the coil 5.

Next, the operation when the horizontal deflection current for convergence correction is negative will be described. As shown in FIG. 12B, the direction of the magnetic flux φm of the magnet 3 is the same as when the horizontal deflection current is positive. The direction of the magnetic flux φ1 indicated by the dotted arrow of the first coil 4 is generated in the opposite direction to the direction of the magnetic flux φm of the magnet 3 indicated by the dotted U-shape, and the second coil 5 generates the magnetic flux φ2. The directions are the same with respect to the magnetic flux φm of the magnet 3. Therefore, the magnetic flux generated in each coil and the action of inductance occur. In the state where the horizontal deflection current is negative, that is, when the magnetic field lines are going from the bottom to the top, the current hardly flows through the first coil 4, and the second coil 5
Becomes the same normal operation as when the magnetic bias by the magnet 3 is not applied.

The convergence in the left half of the screen is dominated by the positive half-wave of the horizontal deflection current, and the convergence in the right half is dominated by the negative half-wave of the horizontal deflection current.

Therefore, in the left half of the screen of the cathode ray tube, a large amount of current flows in the first coil 4 in which the current easily flows,
In the right half, a large amount of current flows in the second coil 5. That is, the first coil 4 includes the upper coil 1
However, since the lower coil 2 is connected to the second coil 5, as shown in FIG. 15, the lines of magnetic force are in opposite directions to the center line 8 of the screen as indicated by broken line arrows. The movement of the electron beam 7 caused by the line of magnetic force is received by the force in the direction shown by the white arrow, and the screen of the cathode ray tube shows the locus 9 of the red electron beam at the horizontal position as shown in FIG. To the upper side, the trajectory 10 of the Blue electron beam is shifted downward from the horizontal position.

However, in this convergence correction device, the magnetic flux φ is applied before applying the magnetic bias by the magnet 3.
1 and the magnetic flux φ2 are balanced, and as described above, the positive deflection current is dominant in the half of the screen, the vertical axis is the boundary, and the negative deflection current is dominant in the right half of the screen. By applying a bias, even if the deflection current is the same, the amount of change in the inductance is not the same, so
Eventually, the center of the deflection amount is not the center of the screen, and the range of the screen controlled by the current is also different. For example, in FIG. 14, as shown in FIG. 17, the scanning center line 11 is the screen center line 8 It will move to the left side. As a result, the amplitude before applying the magnetic bias also changes.

That is, the horizontal amplitude changes or the center line 8 of the screen moves due to the amount of the magnetic bias of the magnet 3, and every time the magnetic bias is changed, for example, the neck component of the cathode ray tube causes a change again. Had to be adjusted.

[0014]

As described above, in the conventional structure, each time the magnetic bias is changed by the magnet 3,
There was a problem that the readjustment of the center line 8 of the screen was required.

The present invention solves the above-mentioned problems of the prior art. Even if the magnetic bias is changed by a magnet, the required convergence can be obtained, the horizontal amplitude is not changed, and the screen is not changed. It is an object of the present invention to provide a deflection yoke device that does not require readjustment of the center line of the.

[0016]

In order to achieve this object, a deflection yoke device of the present invention comprises an E-shaped magnetic core, a first coil and a second coil inserted into magnetic legs at both ends of the magnetic core. , A magnet disposed adjacent to the magnetic legs at both ends, and a magnetic bias of the magnet causes a difference in current flowing through the first coil and the second coil, and the horizontal deflection coil or The configuration is such that the current flowing through the auxiliary coil is variable.

[0017]

In this structure, the magnetic flux generated by the current flowing through the first coil and the magnetic flux generated by the current flowing through the second coil pass through the central magnetic leg of the E-shaped magnetic core without interfering with each other. It operates and the magnetic bias by the magnet is equally applied to the first coil and the second coil. Therefore, the deflection current operates equally even when the deflection current is positive or negative, and fluctuations in horizontal amplitude or The movement of the center line of the screen will be eliminated.

[0018]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention, the same parts as those described in the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The convergence correction circuit of the deflection yoke device of this embodiment is the same as the convergence correction circuit of FIG.

As shown in FIG. 1, in the convergence correction apparatus of this embodiment, the first coil 4 and the second coil 5 are attached to the magnetic legs 13 and 14 at both ends of the E-shaped magnetic core 12,
Moreover, the magnet 3 is arranged adjacent to the magnetic legs 13 and 14 and the magnetic leg 15 in the central portion.

The operation of the deflection yoke device configured as described above when the deflection current for convergence correction is positive will be described below.

As shown in FIG. 2, the magnetic flux φ1 generated from the first coil 4 and the magnetic flux φm generated from the magnet 3 flow in the magnetic leg 13 in the same direction, and the magnetic leg 14 has the second magnetic flux φ2. The magnetic flux φ2 generated from the coil 5 and the magnetic flux φm generated from the magnet 3 flow in different directions.

That is, the first coil 4 has (φ1 + φ
The magnetic flux of (m) is flowing in the second coil 5 (φ2-φm). Therefore, the magnetic bias of the magnet 3 is
Although the magnetic flux φ1 generated by the first coil 4 and the magnetic flux φ2 generated by the second coil 5 are applied to each other, the magnetic flux φ1 generated by the first coil 4 between the first coil 4 and the second coil 5 is A magnetic flux φ2 generated by the second coil 5 is generated by forming a closed circuit of the leg 13 and the magnetic leg 15.
4 → A closed circuit of the magnetic leg 15 is formed, and the magnetic flux φ1 generated by the first coil 4 and the magnetic flux φ2 generated by the second coil 5 are in the same direction in the magnetic leg 15, so that
Mutual interference between the magnetic flux φ1 and the magnetic flux φ2 does not occur.

The magnetic saturation characteristic (current-inductance characteristic) before applying the magnetic bias by the magnet 3 to the convergence correction apparatus of this embodiment is as shown in FIG. That is, with the deflection current 0 as a boundary, each inductance decreases when the deflection current flows in the positive direction and when the deflection current flows in the negative direction. When a magnetic bias from the magnet 3 is applied to this, as shown in FIG. 4, the horizontal axis is moved by the amount of the magnetic bias from the magnet 3, and the amount of horizontal deflection current flowing to the left and right and the amount of change in inductance due to that amount. Are equivalent.

The operation when the horizontal deflection current for convergence correction is negative is that the direction of the horizontal deflection current is opposite to that shown in FIG. 2 as shown in FIG. 5, and the effect is exactly the same. is there.

Since the deflection yoke device of this embodiment is the same as that of the conventional example, the convergence effect is the same as that of the conventional example.
The effect of magnetic field lines in the cathode ray tube and the effect of the magnetic field lines on the electron beam are the same.
The same phenomenon as 6 is shown. However, in the deflection yoke device of this embodiment, since the convergence correction device has the above-described magnetic flux flow, in this embodiment, the movement of the center line 8 of the screen and the fluctuation of the horizontal amplitude, which are seen in the conventional example, do not occur. Does not happen.

As described above, according to this embodiment, the E-shaped magnetic core 12 is provided, and the magnetic legs 13 and 14 of the magnetic core 12 are
The first coil 4 and the second coil 5 are inserted and attached, and the magnetic leg 13,
The magnetic flux generated by the current flowing through the first coil 4 and the magnetic flux generated by the current flowing through the second coil 5 have a magnetic leg at the center of the magnetic core 12 due to the configuration in which the magnet 3 is disposed adjacent to the magnets 14 and 15. 15 and operate without interference with each other, and the magnetic bias due to the magnet 3 is applied to the first coil 4
And the second coil 5 are equally applied to the convergence correction device, the deflection current is operated equally even when the deflection current is positive or negative, and there is no fluctuation in horizontal amplitude or movement of the center line 8 of the screen. can do.

(Second Embodiment) A second embodiment of the present invention will be described below.

As shown in FIGS. 6 and 7, the first coil 16 and the second coil 17, which are coils with a magnetic core, in which an electric wire is wound directly around a drum core of a magnetic material (for example, ferrite) are provided at both ends, and The drum core 18, which is a magnetic material without winding the electric wire, is located at the center and the magnetic material is provided on the magnetic base 19.
A disk-shaped permanent magnet 20 arranged so as to form a character shape and rotatably arranged around the drum core 18 as a central axis;
It is configured to be sandwiched by the base 19. Further, the disk-shaped permanent magnet 20 has a structure in which, for example, an N pole is formed at one point on the circumference, and an S pole is formed at the opposite side, that is, a position rotated by 180 degrees.

The magnetic saturation characteristics of the convergence correction device thus constructed are as shown in FIG. This Figure 8
As is clearer, by rotating the disk-shaped permanent magnet 20 about the drum core 18 as a central axis, the inductance of the first coil 16 is increased when the deflection current is positive (the permanent magnet 20 is rotated clockwise 90 It is also possible to decrease (decrease) the permanent magnet 20 to the left by 90 degrees, and the desired convergence effect can be freely obtained by rotating the permanent magnet 20. It can be adjusted freely.

As described above, according to the present embodiment, the disk-shaped permanent magnet 20 rotatably arranged about the central drum core 18 is rotated to rotate the first coil 16 and the second coil 17. By varying the magnetic bias applied to, the same effect as in the first embodiment can be obtained.
There is also an effect that the process of winding the first coil 4 and the second coil 5 on the E-shaped magnetic core 12 of the first embodiment and the process of assembling can be simplified.

(Embodiment 3) A third embodiment of the present invention will be described below.

As shown in FIG. 9, in this embodiment, the drum core 18 of the above-described second embodiment is used as a third coil 21 which is a coil with a magnetic core in which an electric wire is wound around a drum core made of a magnetic material. The coil 17 and the third coil 21 are sandwiched between the magnetic base 19 and the magnet 3 described above.

The third coil 21 is wired so as to generate magnetic force lines in the same direction as that of the magnetic force lines formed by the first coil 16 and the second coil 17, and the third coil 21 has the first coil 16 and the second coil 17. It serves to strengthen the closed magnetic circuit of the coil 17.

As described above, according to the present embodiment, the third coil 21 is provided at the central portion so as to generate the magnetic force lines in the same direction as the direction of the magnetic force lines formed by the first coil 16 and the second coil 17 at both ends. As a result, the first coil 16 and the second coil 17 are made to work to increase the effect,
The same effect as that of the first and second embodiments can be obtained.

[0037]

As is apparent from the above description, the present invention provides an E-shaped magnetic core, a first coil and a second coil attached to magnetic legs at both ends of the magnetic core, and magnetic legs at both ends. The magnets are arranged adjacent to each other, and the currents flowing through the first coil and the second coil are made different by the magnetic bias of the magnets, and the currents flowing through the horizontal deflection coil or the auxiliary coil are made different by the difference currents. Due to the variable configuration, even if the magnetic bias is changed by the magnet, the required convergence change is obtained, the horizontal amplitude is not changed due to it, and there is no need to readjust the center line of the screen. The deflection yoke device can be realized.

[Brief description of drawings]

FIG. 1A is a schematic perspective view of a convergence correcting device of a deflection yoke device according to a first embodiment of the present invention, and FIG. 1B is a side view of FIG.

FIG. 2 is a diagram showing the flow of magnetic flux when the deflection current is positive in the same convergence correction apparatus.

FIG. 3 is a magnetic saturation characteristic diagram before applying a magnetic bias by a permanent magnet to the convergence correction device.

FIG. 4 is a magnetic saturation characteristic diagram when a magnetic bias from a permanent magnet is applied to the convergence correction device.

FIG. 5 is a diagram showing the flow of magnetic flux when the deflection current is negative in the same convergence correction apparatus.

FIG. 6 is a schematic side view of a convergence correction device for a deflection yoke device according to a second embodiment of the present invention.

FIG. 7 is a perspective view of FIG.

FIG. 8 is a magnetic saturation characteristic diagram when a permanent magnet of the convergence correction device is rotated.

FIG. 9 is a schematic side view of a convergence correction device for a deflection yoke device according to a third embodiment of the present invention.

FIG. 10 is a circuit diagram of a deflection yoke device having a convergence correction device arranged to change the current flowing in the horizontal deflection coil.

FIG. 11 is a schematic side view of a convergence correction device for a conventional deflection yoke device.

FIG. 12A is a diagram showing a magnetic flux flow when the deflection current is positive in the same convergence correction device, and FIG. 12B is a diagram showing a magnetic flux flow when the deflection current is negative in the same convergence correction device.

FIG. 13 is a magnetic saturation characteristic diagram when a magnetic bias is not applied to the same convergence correction device.

FIG. 14 is a magnetic saturation characteristic diagram when a magnetic bias is applied to the convergence correction device.

FIG. 15 is a diagram showing an effect of the convergence correction device on an electron beam.

16 is a state diagram of a screen of a cathode ray tube produced by the effect of FIG.

FIG. 17 is a diagram showing a scanning range of a screen of a cathode ray tube by the convergence correction device.

[Explanation of symbols]

3 permanent magnet 4 first coil 5 Second coil 12 magnetic core 13,14 magnetic legs

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Claims (3)

(57) [Claims] 1. A deflection yoke device comprising: an auxiliary coil arranged at a neck portion of a horizontal deflection coil or a deflection yoke; and a convergence correction device for varying a current flowing through the horizontal deflection coil or the auxiliary coil. The convergence correction device has an E-shaped magnetic core, a first coil and a second coil inserted into magnetic legs at both ends of the magnetic core, and permanent magnets arranged adjacent to the magnetic legs at both ends. , The magnetic bias of the permanent magnet causes a difference in current flowing through the first coil and the second coil,
A deflection yoke device characterized in that the current flowing through the horizontal deflection coil or the auxiliary coil is varied by the current having the difference. 2. The permanent magnet is configured so as to rotate around a magnetic leg at the center of a disk-shaped E-shaped magnetic core as a central axis to vary the magnetic bias applied to the magnetic legs at both ends of the magnetic core. The deflection yoke device according to item 1. 3. A third coil for generating a magnetic force line in the same direction as the direction of the magnetic force line formed by the first coil and the second coil inserted in the magnetic legs at both ends of the E-shaped magnetic core is provided at the center of the magnetic core. The deflection yoke device according to claim 1, which is attached to a leg.