JPH10208663A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the evenness of the heating value of a small coil and a large coil, as well as to make the currents flowing through the small coil and the large coil almost the same, so as to obtain a specific convergence characteristic and a raster distortion characteristic. SOLUTION: A pair of upper and lower horizontal deflection coils LH1 and LH2 with a saddle form are provided. In the horizontal deflection coils LH1 and LH2, wires are wound in the reverse direction by making middle taps T1 and T2 as the border, and while the winding starting and the winding finishing are connected to form one side terminal, the taps T1 and T2 are made as the other side terminal. The horizontal deflection coils LH1 and LH2 are composed of small coils L1 and L4 provided on the window side from the positions of the intermediate taps T1 and T2, and large coils L2 and L3 provided on a horizontal gap side. In order to make the currents flowing through the small coils and the large coils the same, the intermediate taps T1 and T2 are provided to make the self inductance of the small coils larger than the self inductance of the large coils.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke suitable for use in a cathode ray tube device of a color television receiver. Specifically, in a deflection yoke which has a pair of upper and lower horizontal deflection coils of a saddle type and has an intermediate tap on each horizontal deflection coil and is connected in parallel, the inductance of the small coil on the window side from the intermediate tap is reduced by the inductance of the large coil on the horizontal gap side. By making the current larger than the inductance, the currents flowing through the small coil and the large coil are made almost equal, so that a predetermined convergence characteristic and raster distortion characteristic can be obtained, and the amount of heat generated by the small coil and the large coil is made equal. And a deflection yoke.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional cathode ray tube device. A cathode ray tube (CRT: Cathode-RayTube) 50 includes a funnel 50b and a neck 50a, and a deflection yoke 51 is provided in the funnel 50b.

The deflection yoke 51 is configured, for example, as shown in FIG. That is, a pair of upper and lower horizontal deflection coils 51b is wound around the inner surface of the coil separator 51a so as to have a predetermined magnetic flux distribution. This coil separator 5
A core 51c is mounted on the outside of the core 51a.
Is wound with a vertical deflection coil 51d.

As is well known, a sawtooth current is supplied to a horizontal deflection coil 51b and a vertical deflection coil 51d.
The generated magnetic field deflects the electron beams (R, G, B) in up, down, left, and right directions. The winding system of the horizontal deflection coil 51b is a saddle type, and the winding system of the vertical deflection coil 51d is a saddle type or a toroidal type.

By the way, the inductance of the horizontal deflection coil decreases as the frequency becomes higher, and the upper and lower horizontal deflection coils require about 20 turns. When the number of turns is small as described above, in the section winding after the bobbin (separator) is determined, or in the saddle coil of the pin driving die winding type after the die is determined, the convergence characteristic and the raster distortion characteristic are adjusted.
The sensitivity was too large when performing position adjustment for each turn, and it was difficult to perform the intended adjustment.

In order to solve such difficulties in adjustment, it has been conventionally proposed to double the number of turns of each of the upper and lower horizontal deflection coils and to connect the parallel by outputting an intermediate tap.

FIG. 9A shows a winding state of such a horizontal deflection coil. First, the upper horizontal deflection coil L
H3 will be described. In the horizontal deflection coil LH3, first, a wire is wound on the window side to form a small coil L50, and a wire is wound in the reverse direction on the horizontal gap side with the intermediate tap T3 as a boundary, thereby forming a large coil L51.
In this case, the winding start and the winding end of the wire are connected to form one terminal, and the intermediate tap serves as the other terminal. One terminal is connected to the terminal 62, and the other terminal is connected to the terminal 61. A horizontal deflection current is supplied between the terminals 61 and 62.

Next, the lower horizontal deflection coil LH4 will be described. In the horizontal deflection coil LH4, first, a wire is wound around the window side to form a small coil L53, and a wire is wound around the intermediate tap T4 in the opposite direction toward the horizontal gap to form a large coil L52. In this case, the winding start and the winding end of the wire are connected to form one terminal, and the intermediate tap serves as the other terminal. One terminal is connected to the terminal 62, and the other terminal is connected to the terminal 61.

FIG. 9B shows a connection state between the large coil L51 and the small coil L50 of the upper horizontal deflection coil LH3 and the large coil L52 and the small coil L53 of the lower horizontal deflection coil LH4. That is, the large coil L51 and the small coil L50 of the horizontal deflection coil LH3 are connected in parallel, the large coil L52 and the small coil L53 of the horizontal deflection coil LH4 are connected in parallel, and the horizontal deflection coils LH3 and LH4 are connected in parallel. ing.

[0010]

By the way, in the proposal of the horizontal deflection coil as shown in FIG. 9, conventionally, the ratio of the inductance between the small coil and the large coil of each of the upper and lower horizontal deflection coils LH3 and LH4 has been discussed. Was not mentioned.

Unless the ratio of the inductance of the small coil and the inductance of the large coil is taken into account, the same relationship between the winding distribution and the magnetic field distribution as in the conventional horizontal deflection coil having no intermediate tap cannot be obtained, and the predetermined convergence characteristic and raster distortion characteristic cannot be obtained. Not only cannot be obtained, but also the current flowing through the small coil and the large coil becomes unbalanced, and the amount of heat generated by the coil on the side where the large current flows increases.

Therefore, in the present invention, the currents flowing through the small coil and the large coil are made substantially equal so that predetermined convergence characteristics and raster distortion characteristics can be obtained, and the amounts of heat generated by the small coil and the large coil are equalized. With the goal.

[0013]

A deflection yoke according to the present invention has a pair of upper and lower horizontal deflection coils of a saddle type, and each horizontal deflection coil is wound with a wire in an opposite direction with an intermediate tap as a boundary. The winding start and the winding end of the wire are connected to form one terminal and the intermediate tap is used as the other terminal. Each horizontal deflection coil includes a small coil disposed on the window side from the position of the intermediate tap and the intermediate tap. And a large coil arranged on the side of the horizontal gap from the position (1), wherein the self-inductance of the small coil is larger than the self-inductance of the large coil.

In the present invention, the inductance of the small coil of each of the upper and lower horizontal deflection coils is made larger than the inductance of the larger coil. Therefore, the currents flowing through the small coil and the large coil can be made substantially equal, and the same relationship between the winding distribution and the magnetic field distribution as in the conventional horizontal deflection coil having no intermediate tap can be obtained. Further, since the currents flowing through the small coil and the large coil are substantially equal, a large current does not flow through the small coil or the large coil.

[0015]

FIG. 1 shows a cathode ray tube device as an embodiment. The cathode ray tube 10 includes a funnel 10b and a neck 10a.
A deflection yoke 11 is provided at 0b.

As shown in FIG. 2, in the deflection yoke 11, a horizontal deflection coil 11b is wound around an inner surface of a coil separator 11a, a core 11c is mounted outside the coil separator 11a, and a vertical deflection coil 11d is mounted on the core 11c. Is wound. Vertical deflection coil 1
1d is wound in a toroidal shape and has a horizontal deflection coil 11b.
Is wound in a saddle shape. As is well known, the horizontal deflection coil 11b is supplied with a sawtooth current having a horizontal deflection cycle, and the vertical deflection coil 11d is supplied with a sawtooth current having a vertical deflection cycle. The generated magnetic field is distributed to the neck 10a. R (red), G from an electron gun (not shown)
The (green) and B (blue) electron beams are deflected in up, down, left, and right directions.

FIG. 3A shows a winding state of such a horizontal deflection coil. First, the upper horizontal deflection coil L
H1 will be described. In the horizontal deflection coil LH1, a wire is first wound around the window side to form a small coil L1, and a wire is wound around the intermediate tap T1 in the opposite direction to the horizontal gap side to form a large coil L2.
In this case, the winding start and the winding end of the wire are connected to form one terminal, and the intermediate tap serves as the other terminal. Then, one terminal is connected to the terminal 15 and the other terminal is connected to the terminal 16. A horizontal deflection current is supplied between the terminals 15 and 16.

Next, the lower horizontal deflection coil LH2 will be described. In the horizontal deflection coil LH2, first, a wire is wound on the window side to form a small coil L4, and a wire is wound in the opposite direction on the horizontal gap side with the middle tap T2 as a boundary, thereby forming a large coil L3. in this case,
The winding start and the winding end of the wire are connected to form one terminal, and the intermediate tap serves as the other terminal. Then, one terminal is connected to the terminal 15 and the other terminal is connected to the terminal 16.

FIG. 3B shows a connection state between the large coil L2 and the small coil L1 of the upper horizontal deflection coil LH1, and the large coil L3 and the small coil L4 of the lower horizontal deflection coil LH2. That is, the large coil L2 and the small coil L1 of the horizontal deflection coil LH1 are connected in parallel, the large coil L3 and the small coil L4 of the horizontal deflection coil LH2 are connected in parallel, and the horizontal deflection coils LH1 and LH2 are connected in parallel. ing.

In this embodiment, in order to make the currents flowing through the small coil L1 and the large coil L2 of the upper horizontal deflection coil LH1 equal, the self-inductance of the small coil L1 is larger than the self-inductance of the large coil L2. Is provided with an intermediate tap T1. Similarly, the small coil L4 and the large coil L of the lower horizontal deflection coil LH2
In order to equalize the current flowing through the coil 3, an intermediate tap T2 is provided so that the self-inductance of the small coil L4 is larger than the self-inductance of the large coil L3.

Hereinafter, it will be described that a condition for equalizing the currents flowing through the small coil and the large coil is that the self-inductance of the small coil is larger than that of the large coil.

When the self-inductances of the coils L1 to L4 are L1 to L4 and the mutual inductance between the coils is M12, M13, M14, M23, M24, M34, the small coil of the upper horizontal deflection coil LH1 Equations (1) and (2) hold for L1 and large coil L2. Similarly, equations (3) and (4) hold for the small coil L4 and the large coil L3 of the lower horizontal deflection coil LH2.

[0023]

(Equation 1)

In the above equations (1) and (2),
Assuming equation (5), equation (6) holds.

[0025]

(Equation 2)

From the symmetry of the mutual inductance of the pair of coils, M ₁₃ can be set to M _24, and L ₁ +
The relationship of M ₁₄ = L ₂ + M ₂₃ is obtained. In this case, the mutual inductance M ₁₄ of the coil L1, L4 which is separated from the mutual inductance M ₂₃ between adjacent coils L2, L3 from the shape of the deflection yoke, the M _23> M _14. Therefore, L ₁ > L ₂ is derived.

Similarly, in the equations (3) and (4), if the equation (5) is satisfied, the equation (7) is established, and L ₄
> L ₃ is derived.

[0028]

(Equation 3)

As described above, in the present embodiment, the small coils L of the upper and lower horizontal deflection coils LH1 and LH2 are used.
The self-inductances of the small coils L1, L4 are larger than the self-inductances of the large coils L2, L3.
And the currents flowing through the large coils L2 and L3 are equalized.
Therefore, it is possible to obtain the same relationship between the winding distribution and the magnetic distribution as the conventional horizontal deflection coil having no intermediate tap,
Predetermined misconvergence characteristics and raster characteristics can be obtained. Further, a large current does not flow through the small coil or the large coil, and heat generation can be suppressed.

According to the embodiment, in a 20-inch television receiver, in the case of a CRT deflection yoke having an aspect ratio of 4: 3 and a deflection angle of 90 °, the ratio of the self-inductance of the small coil L1 and the large coil L2 is approximately L1: L2 = 1.15: 1.

In the above embodiment, the intermediate taps T1, T2 of the horizontal deflection coils LH1, LH2 are set so that the currents flowing through the small coils L1, L4 and the large coils L2, L3 are equal. did. However, providing the intermediate taps T1 and T2 in such a manner requires the deflection yoke 1
1 is very difficult. Therefore, the intermediate tap T
1, the position of T2 is slightly shifted so as to generate a current difference between the small coils L1, L4 and the large coils L2, L3, and a variable inductor is connected in series to the coil with the larger current, The current balance may be obtained.
FIG. 4A shows an example in which variable inductors L20 and L21 are connected to large coils L2 and L3, respectively.

As described above, according to the connection of the variable inductors, the small coils L1, L4 and the large coils L2, L3
In addition to balancing the current, the current balance between the small coils L1, L4 and the large coils L2, L3 can be changed, and the magnetic field distribution can be changed in the direction of the pin pattern or the barrel pattern with respect to the design center. Convergence and raster distortion by the horizontal deflection coils LH1 and LH2 can be adjusted.

Although the variable inductors L20 and L21 may be formed independently, they may be integrally formed as a bifilar winding. In that case, the horizontal deflection coil L
It is easy to balance between H1 and LH2, and the adjustment can be simplified as one variable inductor (FIG. 4).
B).

FIG. 5A shows a saturable reactor R1 connected to coils L1 to L4 constituting the horizontal deflection coils LH1 and LH2, and a parallel circuit of small coils L1 and L4 and a large coil L1.
A coil L30 and a coil L31 constituting the saturable reactor R1 are connected in series to a parallel circuit of L2 and L3. In such a configuration, when a horizontal deflection current is supplied between the terminals 15 and 16, the operation of the saturable reactor R1 causes
The balance between the currents flowing through the small coils L1 and L4 and the large coils L2 and L3 is adjusted, and the convergence and the raster distortion of the lines x and y shown in FIG. 5B can be adjusted.

FIG. 6B shows a saturable reactor transformer R2 as shown in FIG. 6A, in which the inductances of the coils L30 and L31 are changed in a vertical cycle, and the balance between the small coil and the large coil is varied. Points a, b,
The convergence balance between c and d can be arbitrarily adjusted.

[0036]

According to the present invention, in the deflection yoke which has a pair of upper and lower horizontal deflection coils of a saddle type, and has an intermediate tap for each horizontal deflection coil and is connected in parallel, the inductance of the small coil closer to the window than the intermediate tap is provided. Is larger than the inductance of the large coil on the horizontal gap side, the currents flowing through the small coil and the large coil can be made substantially equal, and predetermined convergence characteristics and raster distortion characteristics can be obtained. Further, since the currents flowing through the small coil and the large coil are substantially equal, the heat generation amounts of the small coil and the large coil can be equalized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cathode ray tube device showing an embodiment of the present invention.

FIG. 2 is a diagram showing a deflection yoke in the embodiment.

FIG. 3 is a diagram showing a winding state and a connection state of a coil.

FIG. 4 is a diagram showing a connection state of a coil when a variable inductor is connected.

FIG. 5 is a diagram showing a connection state of a coil when a saturable reactor is connected.

FIG. 6 is a diagram illustrating a connection state when a saturable reactor is modulated with a vertical cycle.

FIG. 7 is a diagram showing a conventional cathode ray tube device.

FIG. 8 is a view showing a conventional deflection yoke.

FIG. 9 is a diagram showing a winding state and a connection state of a conventional coil.

[Explanation of symbols]

10: cathode ray tube device, 10a: neck portion, 10
b: funnel part, 11: deflection yoke, 11a
... Separator, 11b ... Horizontal deflection coil, 11
c: core, 11d: vertical deflection coil, L1, L
4 ... Small coil, L2, L3 ... Large coil, T1,
T2: middle tap, R1, R2: saturable reactor, L20, L21: variable inductor

Claims (5)

[Claims] 1. A pair of upper and lower horizontal deflection coils of a saddle type, wherein each horizontal deflection coil has a wire wound in an opposite direction with an intermediate tap as a boundary, and the start and end of winding of the wire are connected. One of the terminals and the intermediate tap as the other terminal. Each of the horizontal deflection coils is disposed on the window side from the position of the intermediate tap and on the horizontal gap side from the position of the intermediate tap. A deflection yoke comprising a large coil and a small coil, wherein the self inductance of the small coil is larger than the self inductance of the large coil. 2. The deflection yoke according to claim 1, wherein a variable inductor for adjusting inductance is connected in series to the small coil or the large coil. 3. The deflection yoke according to claim 2, wherein the variable inductor connected to the small coil or the large coil of each of the horizontal deflection coils is integrally formed by bifilar winding. 4. A saturable reactor is connected to both a small coil and a large coil of each of said horizontal deflection coils, and a balance between currents flowing through said small and large coils is varied in synchronization with a horizontal deflection cycle. The deflection yoke according to claim 1, wherein: 5. The method according to claim 1, wherein an inductance of a coil constituting the saturable reactor is modulated by a current having a vertical deflection cycle, and a balance between currents flowing through the small coil and the large coil is further changed in synchronization with the vertical deflection cycle. The deflection yoke according to claim 4, characterized in that: