JPH1125881A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke, capable of achieving a reversal cross ill convergence correction with the small number of, components, with high performance, with high productivity, and at low price. SOLUTION: In a deflection yoke having a horizontal deflection coil 2, a vertical deflection coil 1, and a core 3a, the vertical deflection coil 1 is divided into three pairs of outer coils 1c, 1f forming a pair on the left side and the right side to the vertical axis Y, central coils 1b, 1e, and inner coils 1a, 1d, the central coils 1b, 1e are connected in parallel to a diode group D connected in parallel at opposite polarities to each other so as to constitute a parallel connecting body, and the outer coils 1c, 1f and the central coils 1a, 1d are connected to the parallel connecting body in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke used in a color picture tube, and more particularly to convergence correction.

[0002]

2. Description of the Related Art In recent years, cathode ray tube (CRT) display devices have become larger, wider and flatter, and deflection yokes used in these display devices have higher convergence and lower distortion. It is becoming more demanding. In particular, due to the flattening of the CRT, upper and lower pincushion distortion (hereinafter referred to as "vertical distortion") and reversal misconvergence of the horizontal line cross between the middle portion and the peripheral portion of the screen occur. Are the difficulties in designing the deflection yoke.

Conventionally, a deflection yoke in which the above-mentioned inverted cross-misconvergence is corrected has been disclosed in Japanese Patent Laid-Open No. 1-25044.
There is a deflection yoke disclosed in Japanese Unexamined Patent Application Publication No. 5-205. FIG. 13 is a cross-sectional view showing the configuration of the deflection yoke, and FIG. 14 is a connection diagram showing connection of a vertical deflection coil circuit of the deflection yoke shown in FIG.

Next, the deflection yoke will be described with reference to FIGS. The vertical deflection coil is composed of saddle type vertical deflection coils 1a, 1c, 1d, 1f and a toroidal type vertical deflection coil 1h wound directly on the divided ferrite core 3b shown in FIG. This saddle type vertical deflection coil is attached to the outside of an insulating frame 4 called a separator in which the horizontal deflection coil 2 is incorporated, and is wound at an angle of about 21 to 50 ° from the horizontal axis X as shown in FIG. Into a pair of left and right inner coils 1a and 1d forming a formed barrel magnetic field, and a pair of left and right outer coils 1c and 1f forming a pin magnetic field wound within an angle of about 59 to 83 ° from the horizontal axis X. Have been. Another toroidal vertical deflection coil 1h wound around an angle of about 20 to 90 ° from the horizontal axis X is attached to the outside of the saddle type vertical deflection coil so as to form a barrel magnetic field.

A pair of left and right outer coils 1c and 1f of the saddle type vertical deflection coil are connected in series with diodes connected in parallel with opposite polarities, and the inner coils 1a and 1d are connected in parallel to this series connection. The toroidal coil portion 1h is connected in series to these.

Next, the relationship between the vertical deflection coil and misconvergence will be described. Normally, the barrel magnetic field formed by the vertical deflection coil is generated when a large number of coils are wound to a position far from the vertical axis Y of the core 3b as shown in the cross section in FIG. That is, the angle θ connecting the center of the core 3b and both ends of the winding is large. The misconvergence at this time is such that the raster R (red) is narrow in the vertical direction on the left side of the screen and is long in the vertical direction on the right side of the screen, as shown in FIG. This pattern is called PQV (-). Also,
The pin magnetic field is a state in which the angle θ connecting the center of the core 3b and both ends of the winding is small as shown in FIG. 9 and opposite to the barrel magnetic field. As shown in FIG. Are long in the vertical direction, and narrow in the vertical direction on the right side of the screen. This pattern is called PQV (+).

Therefore, it can be seen that in order to correct the inverted cross-miss convergence shown in FIG. 11, the magnetic field distribution of the vertical deflection coil must be a barrel magnetic field in the middle of the screen and a pin magnetic field in the peripheral area.

Next, the operation of the conventional deflection yoke connected as shown in FIG. 14 will be described. Due to the voltage-current characteristics of the diodes connected in parallel with opposite polarities, no current flows on the diode side at low voltage (up to the middle of the screen), so that the toroidal coil portion 1h formed by the barrel magnetic field and A current flows through a pair of left and right inner coils 1a and 1d of the saddle type vertical deflection coil. Therefore, a barrel magnetic field is mainly formed, and the misconvergence PQV (+) in the intermediate portion is corrected. On the other hand, when the voltage is high (peripheral portion of the screen), a vertical deflection current starts to flow to the diode side, so that the outer coils 1c and 1f work, and the pin magnetic field becomes strong. Further, the inner coils 1a, 1 operating at a low voltage
Since the current flowing through d decreases, the barrel magnetic field weakens. This coil also works in the direction of the pin magnetic field to correct the misconvergence PQV (−) in the peripheral portion.

[0009]

In the conventional deflection yoke as described above, since the vertical deflection coil is composed of the left and right saddle type vertical deflection coils and the toroidal type vertical deflection coil, the number of parts is increased. There was a problem. .
The left and right saddle-type vertical deflection coils are mounted on the separator 4 and fixed, and then the toroidal vertical deflection coil 1h wound on the divided core 3b is fixed with the core clip 5 shown in FIG. There is a problem that it is necessary and the workability of assembly is very poor. Further, to wind the vertical deflection coil, a saddle type winding machine and a toroidal type winding machine are required, which is not preferable in terms of winding equipment efficiency.
Further, since the toroidal type vertical deflection coil 1h is mounted outside the saddle type vertical deflection coil, the inner diameter of the core 3b needs to be increased, and a magnetic field cannot be efficiently applied to the electron beam. Had the adverse effect of deterioration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to achieve the reverse cross miss convergence correction of the middle portion and the peripheral portion of the screen by using a small number of components, thereby achieving high performance. It is an object to obtain an inexpensive deflection yoke with good productivity.

[0011]

A deflection yoke according to the present invention separates a vertical deflection coil into at least three pairs of coil portions that are paired on the left and right sides with respect to a vertical axis, and each of the separated coil portions has One pair is connected in parallel with a diode group connected in parallel with opposite polarities to form a parallel connection, and another pair of coil portions is connected in series to the parallel connection.

Further, the vertical deflection coil is separated into at least three pairs of coil portions, which are paired on the left and right sides with respect to the vertical axis, and any one of the separated coil portions is connected in parallel with opposite polarities. The diode group is connected in parallel to form a parallel connection, and a parallel connection formed by connecting another pair of coil portions in parallel is connected in series to the parallel connection.

Further, the vertical deflection coils are separated into three pairs of left and right inner coils, left and right center coils, and left and right outer coils, and the left and right center coils are connected in parallel with a diode group.

Further, a resistor or an inductor is connected in series to a diode group connected in parallel to the pair of coil portions.

Further, a resistor or an inductor is connected in series to a pair of coil portions and connected in parallel to a diode group.

Further, the diode group is composed of two diodes connected in parallel with opposite polarities.

Further, a winding guide provided with a terminal for terminal processing of a vertical deflection coil is attached to a non-split core, and the terminal of the coil part to be separated during the winding of the coil on the winding guide is processed by the terminal processing. And a vertical deflection coil wound around the terminal.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 shows Embodiment 1 of the present invention,
2A is a cross-sectional view, FIG. 2B is a connection diagram of a saddle type vertical deflection coil circuit, and FIG. 2 is an explanatory diagram for explaining a convergence correction effect of the first embodiment. In FIG. 1A, a saddle type vertical deflection coil 1 disposed on the left and right with respect to the Y axis.
Are left inner coil 1a and left central coil 1 respectively.
b, the left outer coil 1c, and the right inner coil 1d, the right central coil 1e, and the right outer coil 1f which are symmetrically arranged with respect to the Y axis. Further, the respective coil portions are connected as shown in FIG. That is, a pair of left side center coils 1
b and the right center coil 1e are connected in series.
Two diodes (hereinafter referred to as a diode group D) connected in parallel with opposite polarities to this series coil are connected in parallel to form a parallel connection body.
Also, a pair of left outer coil 1c and right outer coil 1
f is connected in series, and a pair of left inner coil 1a and right inner coil 1d are connected in series. These paired coil portions are connected in series to the above-described parallel connection body.

Next, the operation will be described. Due to the voltage-current characteristics of the diode group D, the vertical deflection current does not flow through the diode group D when the voltage is low, but flows through the separated vertical deflection coils. On the other hand, at the time of high voltage, a vertical deflection current starts to flow to the diode group D side.
The current flowing through the left and right center coils 1b and 1e decreases.

FIG. 2 is an explanatory diagram for explaining the convergence correction effect on the screen in the first embodiment. First, during a low voltage operation, that is, up to the middle portion of the cathode ray tube, a vertical deflection current flows through all the vertical deflection coils. At this time, in order to correct the inverted cross-miss convergence, it is necessary to make this area a barrel magnetic field as described in the related art. Therefore, the turns ratio is adjusted in advance so that the magnetic field strength of the left and right inner coils 1a and 1d of the vertical deflection coil is increased. Next, at the time of high voltage operation, that is, in the peripheral portion of the cathode ray tube, the vertical deflection current flows to the diode group D, and the right and left central coils 1 of the vertical deflection coil 1
Since the currents b and 1e decrease, the barrel magnetic field strength weakens and moves in the direction of the pin magnetic field, and the magnetic field strength is opposite to that of the middle part of the screen. In this way, the inverted cross-miss convergence is corrected. As can be seen from the above description, according to the first embodiment, it is possible to correct the reversal cross miss convergence without using the toroidal type vertical deflection coil. Therefore, it is necessary to secure a coil space for the toroidal type vertical deflection coil. Thus, the inner diameter of the core can be reduced, and the deflection sensitivity is improved. Referring to FIG. 13, the space is only for one coil, but the actual coil is about 5 mm, which is effective for improving the deflection sensitivity.

FIG. 2 is for correcting the convergence reversal pattern which is generally apt to occur. The coil portions connecting the diode groups D in parallel are the left and right center coils 1b and 1e. Accordingly, the same effect can be obtained by connecting in parallel to the inner coils 1a and 1d or the outer coils 1c and 1f.

Embodiment 2 FIG. FIG. 3 is a connection diagram showing a vertical deflection coil circuit according to the second embodiment. In the first embodiment, a pair of left and right inner coils 1a and 1d and a pair of outer coils 1c and 1f are connected in series to a parallel connection body of a pair of left and right center coils 1b and 1e and a diode group D. Connected. On the other hand, in the second embodiment, as shown in FIG. 3, a pair of left and right inner coils 1a and 1d and a pair of outer coils are connected to a parallel connection body of a pair of left and right center coils 1b and 1e and a diode group D. The coils 1c and 1f are connected in series to a parallel connection body in which the left sides (1a, 1c) and the right sides (1d, 1f) are connected in parallel. In the second embodiment, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG. In the third embodiment, as shown in FIG. 4, a resistor R is connected in series to a diode group D connected in parallel to the left and right central coils 1b and 1e of the vertical deflection coil in the configuration of the first embodiment. Things. Further, an inductor may be connected in addition to the resistor.
This adjusts the shunt ratio between the current flowing to the diode group D side and the current flowing to the center coils 1b and 1e of the vertical deflection coil at the time of high voltage, that is, at the periphery of the screen. The fine adjustment which cannot be adjusted by the turns ratio is performed. By doing this,
It is possible to optimally correct the screen quality. In addition, the degree of design freedom for inversion cross-misconvergence correction is increased, which is effective.

Embodiment 4 The fourth embodiment differs from the first embodiment in that a resistor is connected in series to the left and right central coils 1b and 1e of the vertical deflection coil as shown in FIG. Further, an inductor may be connected in addition to the resistor. The resistors connected in series to the central coils 1b and 1e adjust the switching points (low-voltage region and high-voltage region) of the diode group D.
Similarly, fine adjustment which cannot be adjusted by the turns ratio can be facilitated, and the screen quality can be optimally corrected. In addition, the degree of design freedom for inversion cross-misconvergence correction is increased, which is effective.

Embodiment 5 FIG. 6A and 6B are explanatory views for explaining the fifth embodiment. FIG. 6A is a rear view of the non-split core viewed from the neck side, and FIG. 6B is a rear view of the non-split core with the winding guide attached thereto as viewed from the neck side. FIG. In FIG. 6, 3a is an undivided core, 6 is a terminal pin for terminal treatment of a vertical deflection coil, and is provided on a winding guide 7. The winding guide 7 is composed of two parts, a neck-side part 7a and a screen-side part 7b. Also, this winding guide 7
By engaging a coupling claw 8 provided on the screen side with an engagement hole 9 on the neck side, it is mounted so as to sandwich the core 3a. As the core, a non-divided core is used because there is an advantage that an assembling operation is not required, a uniform thickness is achieved, and the accuracy of the core alone can be improved. In the fifth embodiment, in the above configuration, the vertical deflection coil is wound around the winding guide 7, the coil is pulled out in the middle of the winding, and automatically wound around the pin terminal 6 on the winding machine to perform the wiring processing. Is what you do. In addition, 7 of A to G shown in FIG.
All locations are connected to the pin terminals 6. By doing so, the work of fixing the left and right vertical deflection coils becomes unnecessary, and the wiring can be automatically wired on the winding machine, and the vertical deflection coils can be easily separated. In addition, coil terminal processing after winding is not required, and labor can be saved.

[0026]

As described above, according to the present invention, the vertical deflection coil is separated into at least three pairs of coil portions that are paired on the left and right sides with respect to the vertical axis, and any one of the separated coil portions is connected to each other. A parallel connection body is formed by connecting in parallel with a diode group connected in parallel with the opposite polarity, and for this parallel connection body, another pair of coil portions is connected in series, or with respect to the parallel connection body. Therefore, since the parallel connection body formed by connecting the other pair of coil parts in parallel was connected in series, the inverted cross miss convergence was achieved only with the saddle type vertical deflection coil without using the conventionally required toroidal type vertical deflection coil. It can be easily corrected. Also, there is no need to secure a coil space for the toroidal type vertical deflection coil, and the core inner diameter can be reduced.
The deflection sensitivity is improved.

Further, since a resistor or an inductor is connected in series to the diode group connected in parallel to the pair of coil portions, the shunt ratio of the vertical deflection current flowing through the coil portion and the diode group in the peripheral portion of the screen is adjusted. As a result, it is possible to easily fine-tune the magnetic field strength, and to obtain optimal convergence performance.

Furthermore, since a resistor or an inductor is connected in series to the pair of coil portions and connected in parallel to the diode group, the point at which the diode group operates can be adjusted in accordance with the inverted cross-misconvergence pattern. Optimum convergence performance is obtained.

Further, a winding guide provided with a terminal for terminal processing of a vertical deflection coil is attached to a non-split core, and the terminal of the coil part to be separated is terminated while the coil is wound around the winding guide. Since the vertical deflection coil is wound around the terminal for coiling, coil terminal processing after winding is not required, labor saving can be achieved, productivity can be greatly improved, and cost can be reduced. In addition, it is possible to eradicate wiring errors that may have occurred during manual work by the operator.

[Brief description of the drawings]

FIG. 1 is a cross section and a connection diagram showing Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram illustrating a convergence correction effect according to the first embodiment of the present invention.

FIG. 3 is a connection diagram showing a vertical deflection coil circuit according to a second embodiment of the present invention.

FIG. 4 is a connection diagram showing a third embodiment of the present invention.

FIG. 5 is a connection diagram showing a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating Embodiment 5 of the present invention.

FIG. 7 is an explanatory diagram showing a barrel magnetic field of a vertical deflection coil.

FIG. 8 is an explanatory diagram of a convergence pattern of a barrel magnetic field.

FIG. 9 is an explanatory diagram showing a pin magnetic field of a vertical deflection coil.

FIG. 10 is an explanatory diagram of a convergence pattern of a pin magnetic field.

FIG. 11 is an explanatory diagram of an inverted cross-miss convergence pattern.

FIG. 12 is a rear view showing a conventional split core and a core clip for integrating the split core.

FIG. 13 is a cross-sectional view showing a configuration of a conventional deflection yoke.

FIG. 14 is a connection diagram of a conventional vertical deflection coil circuit.

[Explanation of symbols]

Reference Signs List 1 vertical deflection coil, 1a left inner coil, 1b left central coil, 1c left outer coil, 1d right inner coil, 1e right central coil, 1f right outer coil, 2 horizontal deflection coil, 3a undivided core, D diode group .

Claims (7)

[Claims] 1. A deflection yoke having a horizontal deflection coil, a vertical deflection coil, and a core, the deflection yoke being mounted on a color picture tube, wherein at least three pairs of the vertical deflection coils are formed on the left and right sides with respect to a vertical axis. Separated into coil portions, one pair of the separated coil portions is connected in parallel with a diode group which is connected in parallel with the opposite polarity to each other to form a parallel connection body, and for this parallel connection body, A deflection yoke, wherein a pair of coil portions are connected in series. 2. A deflection yoke which has a horizontal deflection coil, a vertical deflection coil and a core and is mounted on a color picture tube, wherein at least three pairs of the vertical deflection coils are formed on the left and right sides with respect to a vertical axis. Separated into coil portions, one pair of the separated coil portions is connected in parallel with a diode group which is connected in parallel with the opposite polarity to each other to form a parallel connection body, and for this parallel connection body, A deflection yoke, wherein a parallel connection body formed by connecting a pair of coil portions in parallel is connected in series. 3. A vertical deflection coil comprising left and right inner coils,
3. The deflection device according to claim 1, wherein the left and right center coils are separated into three pairs of left and right outer coils, and the left and right center coils are connected in parallel with the diode group. yoke. 4. The deflection yoke according to claim 1, wherein a resistor or an inductor is connected in series to a diode group connected in parallel to the pair of coil portions. 5. The deflection yoke according to claim 1, wherein a resistor or an inductor is connected in series to the pair of coil portions and connected in parallel to the diode group. 6. The deflection yoke according to claim 1, wherein the diode group comprises two diodes connected in parallel with opposite polarities. 7. A winding guide provided with a terminal for processing a terminal of a vertical deflection coil is attached to a non-split core, and a terminal of a coil portion to be separated during winding of a coil around the winding guide is connected to the terminal. The deflection yoke according to any one of claims 1 to 6, wherein a vertical deflection coil is wound around the processing terminal.