JPS6120480A - Deflecting yoke device - Google Patents

Abstract

PURPOSE:To improve yield in manufacturing deflecting yoke by arranging correcting coils on both sides of in line arrangement on a deflecting yoke, connecting an end to the middle point of sensitivity resistance consisting of the first and second resistances arranged in series, and connecting another end to the common connecting point of two rectifying diodes, and providing a variable resistance that adjusts current flowing in the correcting coil. CONSTITUTION:When the value of resistance RSXIV of a sensitivity resistance 18 becomes above normal direction voltage VF, current flows in rectifying diodes D1, D2, and pseude parabolic correcting current IC(IC=I1+I2) that conforms with period of vertical deflecting current IV flows to correcting coils 11, 12. Misconvergence YH becomes larger in upper and lower parts of the picture, and even when the amount of correction differs in upper and lower parts of the picture due to dispersion of the cathoderay tube and deflecting yoke, misconvergence YH can be corrected over whole area of the picture by adjusting current flowing in correcting coils 11, 12 separately in upper part and lower part by changing variable resistances 21, 22 provided in the correcting coils 11, 12 of correcting coil devices 6, 7, and good convergence characteristic can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a deflection yoke device used in television receivers, cathode ray tube display devices, and the like.

<Prior Art> As is well known, in a deflection yoke which is attached to a color cathode ray tube having six electron beams arranged in-line and deflects the electron beam, the horizontal deflection coil as a whole forms a pincushion-shaped deflection magnetic field. The vertical deflection coil is configured to form a barrel-shaped deflection magnetic field. By configuring the deflection coil in this way, it is theoretically possible to reduce misconvergence to zero, but in reality, due to the structure of the cathode ray tube and the configuration of the deflection yoke, the theoretical characteristics are It is difficult to obtain. As a result, various types of misconvergence actually occur.

Conventionally, in order to correct these misconvergence, it is necessary not only to adjust the conductor distribution of the deflection coil that makes up the deflection yoke, but also to generate a correction magnetic field by attaching permanent magnet pieces or foundation pieces to the deflection yoke. Or, the deflection magnetic field is modified.

<Problems to be Solved by the Invention> However, the amount of misconvergence differs depending on the negative radiation tube and deflection yoke that are combined, and in reality, the mode of correction must be determined for each combination. First, it is not very effective in improving the yield of the deflection yoke, and in particular, in the case of text images, the yield of the deflection yoke becomes even worse due to the narrow tolerance range.

Means for Solving the Problems> The present invention has been made to solve the above problems.
The deflection coil is configured so that misconvergence of a substantially horizontal component occurs, correction coil means are arranged at positions on both sides of the in-line array on the deflection yoke, and one end of the correction coil means is arranged in series or in parallel with the vertical deflection coil. connected in series. The second resistor is connected to the connection midpoint of the sensitivity resistor, and the thin end is connected between the two ends of the sensitivity resistor.
A variable resistor is connected to a common connection point of the rectifier diodes and adjusts the current flowing through the correction coil means.

<Function> In the deflection yoke device of the present invention, based on the above-described means, the correction coil constituting the correction coil means,
A pseudo-parabolic correction current that matches the period of the vertical deflection current flowing through the vertical deflection coil is applied to correct the horizontal misconvergence YH at the upper and lower ends of the Y-axis of the screen, and to obtain good funvergence characteristics. That's what happens.

<Embodiment> Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the accompanying drawings. In Figure 2, the deflection yoke'!
[1] A pair of saddle-shaped horizontal deflection coils (not shown) are arranged inside a coil bobbin 2, and a pair of vertical deflection coils 4, 5 are arranged outside the coil bobbin 2 and are wound toroidally around a core B. are arranged, and furthermore, a pair of correction coil means 6.7 is arranged on the rear (municipal gun side) surface of the coil bobbin 2.
is located. Of these, the horizontal deflection coil (not shown) generates a pincushion-shaped horizontal deflection magnetic field, and the vertical deflection coils 4 and 5 generate barrel-shaped vertical deflection magnetic fields, as in the prior art. Here, the correction coil means 6.
If the deflection yoke device without 7 is not adjusted in any way, the raster by the three electron beams on the fluorescent screen will be as shown in FIG. Cross misconvergence occurs in the Y-axis direction), and parabolic misconvergence occurs in the left and right directions (X-axis direction) in the drawing.

In the present invention, the misconvergence xB on both sides of the screen on the X-axis is designed to be zero by changing or adjusting the shape and conductor distribution of the horizontal deflection coil, and By changing or adjusting the distribution, the vertical misconvergence, that is, the cross misconvergence PQv at the diagonal ends of the screen is made zero. Moreover, the misconvergence, that is, the amount of trilemma that inevitably remains due to the design of the deflection yoke, is not a cross misconvergence that is difficult to remove even with conventional correction means.
The misconvergence It Y xr in the horizontal direction at the upper and lower ends of the screen on the Y axis is generated in a concentrated manner. By configuring the deflection yoke in this way, the raster created by the six electron beams on the fluorescent screen will be as shown in Figure 4.
The three rasters almost match at the top and bottom edges of the screen, but
In the horizontal direction, parabolic misconvergence remains.

This misconvergence fiYHG:j is adjusted to zero by the correction coil means 6.7 shown in FIG.

Next, the correction coil means 6, 7 connect the 5N beam B to the outside of the cathode ray tube neck 8, as shown in FIG.

Placed on both sides of the G and R inline arrays. Further, the correction coil means 6.7 includes a U-shaped core 9.10 and a core 9.
．． It is composed of correction coils 11.12 wound around the magnetic flux 15. 14. 15°16 is neck 8
The cores 9.10 face each other so as to pass through the inside of the coils, and the correction coils 11.12 are connected to each other.

The correction coil 11.12 of the correction coil means 6.7 has a first
It is connected to a correction circuit as shown in the figure.

That is, the vertical deflection circuit 17, the second rectifier diode J), IJ, connected to the vertical deflection circuit 17 are connected in series and in parallel to the sensitivity resistor 18 with their cathodes connected to each other. Connection midpoint of sensitivity resistor 18 connected in series to vertical deflection coils 4 and 5 (connection point of resistors 18R and 18S)
18a! :Common connection point 1 of rectifier diodes D, D,
Between 9 and 9 is a correction coil 11, 12 and a resistor 20 as necessary.
, and between the cathode of the rectifier diode D and the common connection point 19 and the cathode of the rectifier diode D and the common connection point 19, there is a first circuit that adjusts the current flowing through the correction coil /l/11.12. ．． Second variable resistors 21 and 22 are connected respectively.

Next, the operating state of the deflection yoke device of the present invention will be explained. Vertical deflection coil 4 connected to vertical deflection circuit 17.
5, a sawtooth wave deflection current 1V flows through the vertical deflection coil 4.5, as shown in FIG. 6(A), and the resistance value of the sensitivity resistor 18 is The first variable resistor 21 is connected to the impedance of the correction coil 11 and 12.
If the current is smaller than the sum of the resistance value of the sensitivity resistor 18, a sawtooth wave current approximately equal to the deflection current 1V flowing through the vertical deflection coil 4°5 flows, and the resistance value of the sensitivity resistor 18 (Rs)
A voltage drop of I v occurs. As shown in FIG.
When taken as a reference, the polarity is reversed at each point at both ends 18b and 13c of the sensitivity resistor 18 (Fig. 6 (13), solid line 1 is point 181), and %lV is point 18C. ).

Furthermore, when a sawtooth wave current that almost matches the deflection current Iv flows through the sensitivity resistor 18, the direction of the deflection current Iv shown in FIG. 6(A) is different from that shown in FIG. As shown in , one point 1sb is one point 18C (in the direction of arrow A). At this time, if the connection midpoint 18a is used as a reference, the point 18b is 2 points 1
8C becomes one potential, a forward potential is applied to the first rectifier diode 1], a reverse potential is applied to the second rectifier diode 1], and only the first rectifier diode D becomes conductive. Second rectifier diode D! oven),
As shown in Fig. 7, the current ■ through the correction coils 11 and 12,
flows. At 11 o'clock, point 1 is based on the connection midpoint.
Both 8b and 18C are at the 1st oM level, and both the first and second rectifier diodes D, D become ovens and no current flows. At 11 o'clock, the current direction is point 1 B as shown in Figure 7.
+- one point 18b (direction of arrow B), and point 18b is -
, point 18C becomes ten potential, and the second rectifier diode ()
! A potential is applied in the forward direction to the first rectifier diode J), and a potential in the reverse direction is applied to the second rectifier diode J).
! Only the first rectifier diode ]), which is conductive, and the current (1), are conductive through the correction coils 11 and 12, as shown in FIG. In addition, since a forward voltage VF exists in the rectifier diode, the resistance value of the sensitivity resistor 18 (Rs
) When the value of Xlv exceeds ■F, each rectifier diode l
)+, T, )t, the vertical deflection current I flows to the correction coil 11.12 as shown in FIG.
A pseudo-parabolic correction current Ic (
1c-I, +1-) flows. Here, when the trilemma landscape (misconvergence) due to the deflection magnetic field is only Y)I as shown in FIG. 4, as shown in FIG. 5, the correction magnetic flux 16 based on the correction current 1c generated from the core 9 B is concentrated into an electron beam O, and
A correction magnetic flux 14 generated from the core 10 and also based on the correction current IC concentrates the electron beam 1t into the electron beam G. The correction magnetic flux 15.16 is 6 electron beams B,
It acts equally on G and R and does not affect the concentration of the electron beam. The misconvergence YB increases as it goes up and down the screen, and even if the amount of correction at the top and bottom of the screen differs due to variations in the cathode ray tube and deflection yoke, the correction coils 11 and 12 of the correction coil means 6 and 7 By changing the variable resistors 21 and 22, the current flowing through the correction coils 11 and 12 is adjusted separately for the upper and lower halves of the screen (the amount of current in the upper and lower halves of the screen is adjusted), and as a result, the misconvergence YH of the screen is It is corrected over the entire range and provides good humbargiance characteristics.

In one embodiment of the deflection yoke device of the present invention, the cores 9 and 10 of the correction coil means 6 and 7 are shown as U-shaped, but the shape of the cores 9 and 10 is not limited to the U-shape, and the correction magnetic flux It is fine as long as it passes through the inside of the neck. Further, the mounting position of the correction coil means 6.7 is not limited to the rear end portion of the coil bobbin 2, but may be arranged, for example, between the rear end rising portion of the horizontal deflection coil and the core 5. Further, the winding shape of the deflection coil is not limited to the embodiment, and both horizontal and vertical deflection coils may be wound in a saddle shape. Although one embodiment of the present invention has been described in which the sensitivity resistor is connected in series with the vertical deflection coil, other circuit configurations may be implemented in which the sensitivity resistor is connected in parallel with the vertical deflection coil. The structure may be configured in the same manner as in the example, and in addition, if the correction amounts at the top and bottom of the screen are equal, the first. In place of the second variable resistor, the correction coil 11.
12 and the common connection point 19, a correction coil 11.12
It may also be configured by connecting one variable resistor in one row. Furthermore, the connection direction of the rectifier diode is also
Depending on the characteristics of the deflection current, they may be arranged and connected in a direction opposite to that of the embodiment.

<Effects of the Invention> The deflection yoke device of the present invention is as described in detail above, and can flow a predetermined pseudo-parabolic correction current to the correction coil by only using two rectifier diodes. In addition, a variable resistor is provided for the correction coil, and the amount of current flowing through the correction coil is also adjusted, making it possible to always obtain the desired correction magnetic field with a simple configuration and a small number of parts. It is possible to provide a deflection yoke device that can extremely easily correct the misconvergence (YH) of three generated electron beams over the entire screen, and that can provide highly accurate convergence.

This has the advantage that the design of the deflection yoke device is easy and the convergence can be easily adjusted, and the manufacturing yield of the single deflection port device can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a wiring diagram of a correction circuit in an embodiment of the deflection yoke device of the present invention, Fig. 2 is a rear view showing a schematic configuration of the deflection yoke device, and Fig. 6 shows a state in which the raster by three electron beams is not converged. FIG. 4 is a raster explanatory diagram showing the state of convergence by only the deflection coil according to the present invention, and FIG. 5 is an explanation of the schematic structure and operation of the correction coil means in one embodiment of the deflection yoke device of the present invention. Figure 6 shows the current and voltage waveforms, where (A) is the vertical deflection current waveform, (B) is the voltage waveform at both ends of the sensitivity resistor when the connection midpoint of the sensitivity resistor is referenced, and (C) is the correction Pseudo-parabolic correction current waveform flowing through the coil, 7th
The figure is an explanatory diagram of a current path flowing through a correction coil of a correction circuit in an embodiment of the deflection yoke mounting according to the present invention. 1... Deflection yoke device, 4.5... Vertical deflection coil,
6.7... Correction coil means, 11.12... Correction coil, 18... Sensitivity resistor, 18a... Connection middle point, D,
,D. ... Rectifier diode, 21.22 ... Variable resistor, 1st
Figure 2 Figure 3 Y Figure 6

Claims (1)

[Claims] A deflection yoke is provided with a horizontal deflection coil that generates a pincushion-shaped horizontal deflection magnetic field and a vertical deflection coil that generates a barrel-shaped vertical deflection magnetic field to deflect three electron beams arranged in-line. the correction coil means are arranged on both sides of the in-line array on the deflection yoke, and one end of the correction coil means is arranged in series or in parallel with the vertical deflection coil. Connect to the connection midpoint of a sensitivity resistor consisting of first and second resistors connected in series, and connect the other end to a common connection point of two rectifier diodes connected between both ends of the sensitivity resistor. A deflection yoke device characterized in that the correction coil means is provided with a variable resistor for adjusting the current flowing through the correction coil means.