JPH1021853A - Deflection yoke device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable mistaken convergence to be adjusted at a screen edge portion by dividing and winding a vertical deflection coil around a core with a vertical axis being a center and connecting a variable resistor parallel to an auxiliary coil wound on both sides of the vertical deflection coil. SOLUTION: A main coil 2 is divided and wound as a vertical deflection coil around a ferrite core 1, and sub coils 3A and 3B that are auxiliary coils are wound on both sides of the main cool 2 of both. The winding count of these sub coils 3A and 3B and winding angles of θA and θB are set so that, even if a rate between a value of a vertical deflection current flowing a main coil 1 and a value of a vertical current flowing the sub coils 3A and 3B is changed, mistaken convergence in a horizontal direction (YH) on a Y axis does not change, a magnetic field distribution at a periphery of the screen is changed. Variable resistance 4 for adjustment is connected in parallel to the sub coils 3A and 3B.

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 for a picture tube used in a color television receiver or the like.

[0002]

2. Description of the Related Art Generally, a deflection yoke device includes a pair of horizontal deflection coils and a pair of vertical deflection coils as shown in FIG. FIG. 6A shows a saddle type coil mainly used for horizontal deflection, and FIG. 6B shows a toroidal type coil mainly used for vertical deflection.

However, in recent years, a deflection yoke device to which a coma coil or the like is added for correction in order to increase the focusing accuracy of an electron beam has been developed due to market needs.

As is well known, a deflection yoke device applies a predetermined deflection to an electron beam. The deflection yoke device applies a sawtooth signal synchronized with a horizontal and vertical cycle to a horizontal deflection coil and a vertical deflection coil, and applies an electronic signal to the deflection beam. Adding deflection to the beam.
Recently, in order to further correct errors such as deflection aberration, a correction coil called a coma coil has been added.
A deflection yoke device for correcting an electron beam has been developed (for example, Japanese Patent Application No. Hei 8-91 filed by the present applicant earlier.
No. 225).

[0005] Such a frame correction coil is used to correct a beam in the horizontal direction on the Y axis at the center of the screen (when the picture tube is viewed from the front,
The vertical direction at the center of the screen is the Y axis, and the horizontal direction is the X axis). However, at present, coils for correcting the periphery of the screen have not yet been put to practical use. The lateral distortion (mainly the amount of misconvergence in the horizontal direction of R (red) and B (blue)) at the periphery of the screen is called PQH, and the assembly error of each deflection yoke device (winding of a coil or the like). However, there is no device that has a function to adjust this. In addition,
P is PERIPHERAL, Q is QALITY, H is HO
RIZONTAL (horizontal direction).

Particularly, in a saddle-toroidal deflection yoke device combining a used saddle-type horizontal deflection coil and a toroidal-type vertical deflection coil,
The value of PQH is greatly affected not only by the variation of the vertical deflection coil itself but also by the horizontal deflection coil and the like. For this reason, there arises a problem that PQH greatly varies in individual deflection yoke devices in an actual manufacturing stage due to assembling accuracy and the like. However, as described above, there is no device provided with a mechanism for adjusting this.

[0007]

As described above, conventionally,
Since there is no adjustment mechanism, there is a problem that the misconvergence amount (PQH) in the peripheral portion of the screen largely varies depending on each deflection yoke device.

In view of the above problems, it is an object of the present invention to provide a deflection yoke device in which an adjustment mechanism is provided in the deflection yoke device itself so that the peripheral portions of the screen can be individually corrected.

[0009]

According to a first aspect of the present invention, there is provided a deflection yoke device capable of correcting a convergence of a peripheral portion of a screen with respect to a center, wherein the deflection yoke device is divided and symmetrical about a vertical axis. A vertical deflection coil disposed, a convergence of an edge of a screen which can be corrected, divided coils, auxiliary coils provided on both sides of each side, and connected in series to the coil; and the auxiliary coil And a variable resistor for adjusting a current flowing through the deflection coil.

According to the first aspect of the present invention, the vertical deflection coil is divided, and sub-coils are provided on both sides of the divided main coil, so that a barrel or pincushion type magnetic field distribution can be created.

Further, in order to adjust the current flowing through the deflection coil, a variable resistor is provided in parallel with the sub-coil, and the flowing current is adjusted by changing the resistance value. That is, the deflection yoke itself is provided with an adjustment mechanism, and a deflection yoke device suitable for mass production is realized.

With the above configuration, it is possible to correct the distortion only in the peripheral portion of the screen without substantially affecting the horizontal distortion on the Y axis. Therefore, when used in combination with a coil for correcting in the horizontal direction on the Y axis, good deflection characteristics can be obtained.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a core part of a deflection yoke device according to an embodiment of the present invention. FIG. 1 (a) is a perspective view showing a winding state of a core half, and FIG. 1 (b) is a side view showing a winding state viewed from the side. Only the vertical deflection coil is shown in the saddle toroidal type deflection yoke device including the saddle type horizontal deflection coil and the toroidal type vertical deflection coil. Of the pair of vertical deflection parts, only the upper part by the core half is shown.

A main coil 2 as a vertical deflection coil was dividedly wound around a fillite core 1, and sub-coils 3A and 3B as auxiliary coils were wound on both sides of both divided main coils 2. Here, the sub coil 3A,
The number of windings of 3B and the winding angles θA and θB change the misconvergence in the horizontal direction (YH) on the Y-axis even when the ratio of the vertical deflection current flowing through the main coil to the vertical current flowing through the sub-coil is changed. Instead, only the magnetic field distribution at the periphery of the screen is set to change.

FIG. 2 is an equivalent circuit diagram for explaining the connection relationship between these coils. In addition to the main coil 2 and the sub-coils 3A and 3B wound on the ferrite core, a variable resistor 4 for adjustment is connected in parallel with the sub-coils 3A and 3B.

That is, in this embodiment, the resistance value of the variable resistor 4 is changed, and the deflection coil 2 and the sub coils 3A, 3A
The current flowing through B was adjusted.

In the above-described deflection yoke device, as shown in FIG. 3 or FIG. 4, when the R and B beams are misconvergence at the edge of the screen, the variable resistor 4 is actually used.
FIG. 5 shows the result of correction by changing the resistance value and making adjustments, and the operation will be described.

FIG. 3 shows misconvergence when R is largely shifted to the left from B at the periphery of the screen when the variable resistor 4 is set to an intermediate value. At this time, if the R beam is corrected to the right, the error is reduced. To achieve this, a barrel-type magnetic field distribution may be created and corrected. In this case, by increasing the resistance value of the variable resistor 4 and increasing the current flowing through the sub-coils 3A and 3B, correction can be performed, and a beam without misconvergence as shown in FIG. 5 can be obtained.

When R is shifted to the right of B as shown in FIG. 4 contrary to FIG. 3, the resistance value of the variable resistor 4 is reduced.
The correction may be performed by reducing the current flowing through the sub-coils 3A and 3B. In this case, the magnetic field distribution is of a pincushion type, the R beam shifts to the left, the misconvergence is reduced, and a beam without misconvergence as shown in FIG. 5 is obtained.

[0020]

EXAMPLES The results of actual experiments are shown in the table below.

[0021]

[Table 1] The experimental results shown in Table 1 were conducted using a 59 cm Toshiba color cathode ray tube and a Toshiba saddle toroidal deflection yoke device for 59 cm color CRT.

The amount of misconvergence (YH) in the horizontal direction on the Y axis and the amount of misconvergence (PQ)
H) is shown by changing the resistance value of the variable resistor 4 from the minimum to the maximum. In addition, to show that there is no effect in the Y-axis direction, the amount of change is also shown.

When the resistance value is the smallest, the amount of misconvergence (YH) is 0.25 mm. When the resistance value is the largest, the amount of misconvergence (YH) is 0.15 mm.
mm. Therefore, the amount of change is -0.1 mm, which indicates that there is almost no effect on the misconvergence in the horizontal direction on the Y axis. On the other hand, when the resistance value is the smallest, the misconvergence (PQH) at the screen edge is
When the resistance value is 0.8 mm, the convergence (PQH) is -0.4 mm. Therefore, the change amount is -1.2 mm, and it can be seen that the adjustment can be performed in a considerably wide range.

In the embodiment described above, the case where the horizontal deflection section is a saddle type coil and the vertical deflection section is a toroidal type coil has been described, but the present invention relates to such a saddle toroidal type deflection yoke device. The present invention is not limited to this, and the vertical deflection unit may be of a saddle-saddle type configured as a saddle type, or may be applied to a toroidal-toroidal type.

[0025]

As described above, according to the present invention, misconvergence of the screen edge can be adjusted over a wide range by the variable resistor.

That is, when the misconvergence amount PQH is large due to factors such as variations in the windings of the vertical deflection coil and the horizontal deflection coil, this can be corrected only by changing the resistance value of the variable resistor. A deflection yoke device can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a deflection yoke device according to an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram for explaining a connection relationship between coils in FIG. 1;

FIG. 3 is a diagram for explaining misconvergence.

FIG. 4 is a diagram for explaining misconvergence.

FIG. 5 is a diagram showing a state in which misconvergence has been corrected.

FIG. 6 is a diagram illustrating types of general deflection coils.

[Explanation of Signs] 1 ... Fillite core 2 ... Main coil 3A, 3B ... Sub coil 4 ... Variable resistance

Claims (1)

[Claims] 1. A deflection yoke device capable of correcting convergence of an edge portion of a screen with respect to a center, comprising: a vertical deflection coil which is divided and symmetrically disposed about a vertical axis; Convergence can be corrected, the divided coils, auxiliary coils provided on both sides of each coil and connected in series with the coil, and currents flowing in the deflection coil provided in parallel with the auxiliary coil are adjusted. And a variable resistor for performing the following.