JPH05328372A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To reduce misconvergence by allowing a vertical deflecting current to flow into coils wound around respective leg parts of an E type magnetic body and connecting a variable resistor to both the ends of a multipolar coil part consisting of the E type magnetic body. CONSTITUTION:Fixed resistors 21 are connected to respective vertical deflection coils 20 in parallel to constitute a vertical coil part. The multipole coil part 22 is constituted by connecting respective leg part coils 22a to 22f to the E type magnetic body in series. The variable resistor 23 is connected to both the ends of the coil part 22 in parallel and the vertical deflection coil part is connected to the coil part 22 in series. When the resistor 23 is changed, a vertical deflection current flowing into the coil part 22 is changed and a magnetic field generated in the coil part 22 is changed. When the deflection quantity of electron beams is adjusted by adjusting the generated magnetic field, red and blue lines on a CRT screen can be superposed to green lines. Thereby the generation of misconvergence such as the intersection of red and blue lines can be prevented.

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 television receiver or the like.

[0002]

2. Description of the Related Art In recent years, in order to make a television receiver thinner, the axial length of a cathode ray tube is shortened and the deflection angle is increased. Since the deflection power increases as the deflection angle increases, the neck diameter for mounting the deflection yoke is reduced. Further, as a cathode ray tube of a television receiver, an in-line system in which three electron guns are horizontally arranged in a line has become mainstream.

In general, a deflection yoke comprises a core, a support provided along the inner surface of the core, a vertical deflection coil wound around the core, and a horizontal deflection coil provided inside the support. Each of these deflection coils is formed as a toroidal or saddle type deflection coil. Further, there is a device provided with a pre-deflection coil in order to reduce vertical misconvergence at the top and bottom of the screen.

FIG. 8 shows the structure of a conventional deflection yoke of this type. In the figure, 1 is a support, and a horizontal deflection coil 2 is arranged inside the support 1. A ferrite core 3 has a vertical deflection coil 4 wound around the ferrite core 3. The ferrite core 3 and the vertical deflection coil 4 wound around the ferrite core 3 are arranged outside the support 1. 5
Is the electron gun side end of the support 1.

A pre-deflection coil 6 is composed of a U-shaped magnetic body 7 and a coil 8 wound around the magnetic body 7. FIG. 10 shows a schematic configuration of the pre-deflection coil section 6 and shows a state viewed from the screen side. The pre-deflection coils 6 are arranged facing each other on the upper and lower portions of the outer periphery of the electron gun side end 5 of the support 1.

The wiring of the vertical deflection coil 4 and the pre-deflection coil 6 will be described. In FIG. 9, the vertical deflection coil 4
Fixed resistors 9 are connected in parallel to each other to provide a vertical deflection coil unit. Further, the pre-deflection coil section in which the coils 8 of the two pre-deflection coils 6 are connected in series and the vertical coil section are connected in series. When a current flows through the pre-deflection coil 6, both ends of the magnetic body 7 become magnetic poles due to the magnetic field generated by the coil 8. Here, the coil 8 is wound and wired such that the magnetic poles at both ends of the magnetic body 7 are magnetized in the same direction when viewed from the screen side.

The operation of the pre-deflection coil 6 will be described below with reference to FIG. For example, vertical deflection coil 4
When a current flows so as to deflect the electron beam in the upward direction, this vertical deflection current also flows in the pre-deflection coil 6, and the magnetic poles at both ends of the magnetic body 7 are the N magnetic pole on the right side and the S magnetic pole on the left side when viewed from the screen side. Becomes The magnetic pole of each U-shaped magnetic body 7 (N
A magnetic field is generated in the direction of arrow 13 from the pole) to the magnetic pole (S pole).

R is a red electron beam, G is a green electron beam, and B is a blue electron beam. These three electron beams generated by the electron gun receive force as follows. The red electron beam R receives a force acting in the arrow 14 direction, the blue electron beam B in the arrow 15 direction, and the green electron beam G in the arrow 16 direction by the magnetic field of the U-shaped magnetic body 7 magnetic pole in the arrow 13 direction. In this way, the deflection magnetic field distributions generated from the horizontal and vertical deflection coils are further deflected to superimpose electron beams of three colors on the screen of the cathode ray tube.

11 and 12 show a CRT screen in a state in which the electron beam is deflected only in the lateral direction and is stationary in the lateral direction. In the figure, 17 is a red line, 18
Is a blue line and 19 is a green line.

For example, as shown in FIG. 11, even if the red line 17 and the blue line 18 overlap each other in the upper part of the screen, the green line 1 can be obtained from the overlapping position of the two colors of red and blue.
9 shifts downward. For such vertical misconvergence, the pinning magnetic field generated by the pre-deflection coil 6 is changed, and the green line 19 is deflected upward by the action of the electron beam to adjust the state in which the three colors are overlapped. It is possible to obtain a state without misconvergence. That is, in the pre-deflection coil 6, as shown in FIG. 10, the force acting vertically on the central green electron beam G is stronger than the force acting vertically on the red electron beam R and the blue electron beam B located on both sides. Therefore, on the vertical axis of the screen, the red line 17 and the blue line 18 and the green line 1
You can stack nine.

The red electron beam R and the blue electron beam B located on both sides receive a magnetic field in an oblique direction with respect to the direction of the magnetic pole of the pre-deflection coil 6, so that the red electron beam R and the blue electron beam B are caused by the force of the horizontal component. The electron beam B is deflected in the lateral direction, and this influence appears as vertical misconvergence when deflected to the left and right ends of the screen. That is, the red line 17 as shown in FIG. 12 is inclined so that the right side becomes narrower in the vertical direction with respect to the left and right of the screen, and the blue line 18 shows the opposite movement and becomes narrower in the left side in the vertical direction with respect to the screen. The red line 17 at the center of the screen.
And the blue line 18 intersect with each other, resulting in misconvergence.

[0012]

As described above, in the conventional structure, the red electron beam R and the blue electron beam B on both sides are formed.
Receives a magnetic field in an oblique direction from the position of the magnetic pole of the pre-deflection coil 6, and therefore acts in the horizontal direction as well as in the vertical direction, so that the force is dispersed, and the red electron beam R and the blue electron beam B are generated by this horizontal force. Since it is deflected in the lateral direction, it appears as misconvergence in the vertical direction as it is deflected to the left and right edges of the screen, and in the CRT screen, the red line 17 is inclined so that the right side becomes narrower in the vertical direction with respect to the left and right of the screen, The blue line 18 has the problem of causing misconvergence in that the red line 17 and the blue line 18 intersect at the center of the screen, showing the opposite movement and inclining so that the left side becomes narrower in the vertical direction with respect to the screen. It was

[0013]

In order to achieve the above object, the present invention arranges a pair of E-shaped magnetic bodies opposed to each other on the outer peripheral side surface of the electron gun side end of the support body which supports the deflection coil. Then, the coil wound around each leg of the E-shaped magnetic body is mounted, and a multi-pole coil unit in which these coils are connected in series is provided. When the vertical deflection current is positive, the upper and lower legs of one E-shaped magnetic body are the S poles and the central leg is the N pole, and the upper and lower legs of the other E-shaped magnetic body are the N poles and their central legs are It is configured to have a south pole. When the vertical deflection current is negative, the pole of each leg is reversed. Further, variable resistors are connected in parallel to both ends of the multi-pole coil section, and the vertical deflection coil section and the multi-pole coil section are connected in series.

[0014]

With this structure, the deflection current flowing in the multipole coil portion is varied, and the three electron beams are vertically deflected by the magnetic field generated between the upper and lower magnetic poles and the central magnetic pole of each E-shaped magnetic body. Let

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. In FIG. 1, reference numeral 20 denotes a vertical deflection coil, and a fixed resistor 2 is attached to the vertical deflection coil 20.
1 are connected in parallel to form a vertical coil section.
Reference numeral 22 is a multi-pole coil unit configured by connecting six coils (22a to 22f) in series. This multi-pole coil unit 2
A variable resistor 23 is connected in parallel to both ends of 2, and a vertical deflection coil unit and a multipole coil unit 22 are connected in series.

Regarding the structure and operation of the multi-pole coil section, FIG. 2 shows the multi-pole coil section 22 as seen from the screen side. FIG. 3 is a sectional view of the deflection yoke.
The mounting position of is shown. 24 and 25 are multipole coil parts 22
Is an E-shaped magnetic substance that constitutes This E-shaped magnetic body 24, 2
Six coils (22a to 22f) wound around a bobbin are attached to each leg of No. 5, and the ends of each leg are magnetic poles. Reference numeral 1 denotes a support similar to the conventional one shown in FIG. 8, and a pair of E-shaped magnetic bodies 24 and 25 are arranged to face each other on the outer peripheral side surface of the electron gun side end portion 5 of the support 1. There is.

For example, when the vertical deflection current is positive, the magnetic pole of the E-shaped magnetic body 24 is S, N, S poles from the upper side, and the magnetic pole of the E-shaped magnetic body 25 is N, S, N poles from the upper side ( 22
a to 22f) are wired. R is red electron beam, G
Is a green electron beam, and B is a blue electron beam, which are emitted from electron guns which are aligned in a horizontal row. These three electron beams are located between the central magnetic poles of the E-shaped magnetic bodies 24 and 25.

The operation of the multipole coil section 22 will be described. When the serial vertical deflection current flowing through the vertical deflection coil unit and the multi-pole coil unit 22 is positive, it is deflected to the upper half of the screen. When the positive current flowing in the multi-pole coil portion 22 is used to deflect the image to the upper half of the screen, a magnetic field in the direction of arrow 26 is applied from the central magnetic pole (N pole) of the E-shaped magnetic body 24 to the magnetic poles (S pole) at both ends. A magnetic field in the direction of arrow 27 is generated from the magnetic poles (N pole) at both ends of the magnetic body 25 to the central magnetic pole (S pole).

The three electron beams operate as follows by the generated magnetic field. The red electron beam R is located near the central magnetic pole of the E-shaped magnetic body 24, and the blue electron beam B is located near the central magnetic pole of the E-shaped magnetic body 25. For the red electron beam R, the magnetic pole at the center of the E-shaped magnetic body 24 (coil 22
The magnetic field emitted from b) acts, and the magnetic field emitted from the magnetic pole (coil 22e) at the center of the E-shaped magnetic body 25 acts on the blue electron beam B. Therefore, the red electron beam R is in the direction of the straight arrow 18 and the blue electron beam B is also in the straight arrow 18 direction.
Move in the direction.

Further, magnetic poles (N pole:
Magnetic fields are generated in the directions of arrows 29 and 30 from the coils 22d and 22f) to the magnetic poles (S poles: the coil 22a and the coil 22c) at both ends of the E-shaped magnetic body 24. E-shaped magnetic body 2
The magnetic field from the central magnetic pole of No. 4 to the central magnetic pole of the E-shaped magnetic body 25 is canceled by the magnetic fields in the directions of the arrows 29 and 30, and the magnetic field in the directions of the arrows 29 and 30 acts on the central green electron beam G. Then, the force in the direction of the arrow 20 on the straight line is received and deflected.

As described above, each E-shaped magnetic body 24,
With respect to the three electron beams located between the both end magnetic poles of 25 and the central magnetic pole, the magnetic fields generated between the both end magnetic poles of the E-shaped magnetic bodies 24 and 25 and the central magnetic pole become magnetic fields only in the horizontal direction. The deflection of the three electron beams is in the vertical direction.

Next, the variable resistance 23 shown in FIG. 1 is changed to change the current of the vertical deflection current flowing through the multi-pole coil section, thereby changing the magnetic field generated in the multi-pole coil section of FIG. By adjusting the generated magnetic field, the deflection amount of the electron beam in the vertical direction can be adjusted, and by adjusting the deflection amount of the electron beam, the red line and the blue line on the CRT screen can be overlapped with the green line. Therefore, since the generated magnetic field is a magnetic field in the horizontal direction with respect to the electron beam, misconvergence such that the red line and the blue line intersect does not occur.

However, in the configuration of the first embodiment, FIG. 6 shows a state in which the electron beam is being deflected in the horizontal direction at the upper part of the screen. As shown in FIG. 6, the electron gun 54
There is a difference d in the peripheral portion of the screen between the position 55 for converging the electron beam from and the position 56 of the phosphor screen. This difference d
Can eliminate the misconvergence of the red and blue electron beams by the deflection amount of the deflection magnetic field, but the green electron beam is at the center of the magnetic field and the deflection amount in the deflection magnetic field is small. The amount of deflection in the peripheral portion does not match. An arc-shaped misconvergence occurs in which the distance between the red line 51 and the blue line 52 is different from that of the green line 53 in the central part and the peripheral part of the screen called green droop shown in the cathode ray tube screen of FIG. The bow-shaped misconvergence of line 53 cannot be resolved.

A second embodiment of the present invention will be described below with reference to FIG.
Also, description will be made with reference to FIG. A wiring diagram is shown in FIG. In the figure, reference numeral 33 is a modulation transformer, which includes a primary coil 34 and a secondary coil 35. 36 is a horizontal deflection coil. 37 is a vertical deflection coil, and 38 is a variable resistor. Reference numeral 39 denotes a multi-pole coil unit, which is a coil (3
9a to 39f) are connected in series.

The end of the multipolar coil portion 39 is connected to one end of the vertical deflection coil 37 and the variable resistor 38 which are connected in parallel. One of the modulation transformers 33 is provided at both ends of the multipole coil unit 39.
The next coil 34 is connected in parallel. The horizontal deflection coil 36 and the secondary coil 35 of the modulation transformer 33 connected in parallel are connected in series.

FIG. 5 shows an external view of the modulation transformer 33.
In the figure, 40 and 41 are drum cores, and 42 is a magnetic body. Magnetic bodies 42 are provided at the left and right ends of the drum cores 40 and 41 to form closed magnetic paths. Of the two drum cores, the vertical deflection current iv2 is passed through the upper drum core 40 as the primary coil 34, and the horizontal deflection current ih is passed through the lower drum core 41 as the secondary coil 35. In this case, the energy due to the vertical deflection current and the energy due to the horizontal deflection current have a difference of 1:10 or more according to the experimental result.
The number of windings of the coil is 4 times for the primary coil 34 and 2
Since the next coil 35 has 50 turns and the energy of the horizontal deflection current is larger, the vertical deflection current is modulated by the horizontal deflection current.

The operation of convergence of the television screen will be described below. The multi-pole coil section 39 has the same configuration as that of the above-mentioned conventional technique, and the function thereof is denoted by the same reference numeral. First, the vertical deflection current iv will be described.
According to the magnitude of the vertical deflection current iv, the vertical deflection coil 37
Is deflected in the vertical direction, and at the same time, its vertical deflection current i
The current is determined by the ratio of the resistance value of the multipole coil unit 39 to the primary coil 34, and the current is divided into iv1 and iv2. The current iv1 is supplied to the multipole coil unit 39 and the current iv2 is supplied to the primary coil 31. Flowing. When only the vertical deflection current flows through the multipole coil portion 39, magnetic poles are generated in the E-shaped magnetic bodies 24 and 25 as shown in FIG. 2 of the previous embodiment, and a magnetic field is generated.

Next, the deflection in the diagonal direction of the screen of the cathode ray tube when the horizontal deflection current ih is applied will be described. By causing the horizontal deflection current ih to flow through the secondary coil 35, an electromotive force of the primary coil 34 of the modulation transformer 33 is generated, and as a result, iv2 flowing through the primary coil 34 and iv1 flowing through the multipole coil unit 39 are changed. The vertical deflection current iv flowing through the vertical deflection coil 37 does not change due to the horizontal deflection current ih, but the action of the modulation transformer 33 causes iv1 flowing through the multipolar coil unit 39 to change according to the horizontal deflection amount of the cathode ray tube screen.

That is, when the horizontal deflection amount of the cathode ray tube screen is small, the current iv2 of the primary coil 34 becomes large,
Therefore, the current iv1 of the multipole coil unit 39 is small. And as the horizontal deflection of the cathode ray tube screen increases,
The current iv2 of the primary coil 34 decreases and the current iv1 of the multi-pole coil portion 39 increases. Therefore, the magnetic field generated from the multipolar coil unit 39 changes according to the horizontal deflection amount, and when the horizontal deflection amount is small, the multipolar coil unit 3
The magnetic field generated from No. 9 is weak and becomes stronger as the horizontal deflection amount increases.

As described above, in the portion where the horizontal deflection current ih is large, that is, in the left and right peripheral portions of the cathode ray tube screen, the deflection amount of the green line in the vertical direction is large, but the portion where the horizontal deflection current ih is small, that is, the center of the cathode ray tube screen. As for the part, the green line has a small deflection amount, and therefore, the arcuate misconvergence of the green line can be reduced.

The drum cores 40 and 41 shown in FIG. 5 may be U-shaped magnetic bodies, as long as the vertical deflection current iv2 is simply modulated by the horizontal deflection current ih.

As described above, in this embodiment, the modulation transformer is provided in parallel with the multipole coil section, and the current in the multipole coil section is modulated by the horizontal deflection current, so that the central portion of the screen called the green droop is formed. It is possible to correct the bow-shaped misconvergence of the green line in which the distance between the red line and the green line is different from that of the green line in the peripheral portion. That is, the amount of deflection of the green line in the vertical direction is large in the area where the horizontal deflection current ih is large (the left and right peripheral portions of the cathode ray tube screen), but the green line is green in the area where the horizontal deflection current ih is small (the center portion of the cathode ray tube screen). The amount of line deflection is small. Therefore, the bow-shaped misconvergence of the green line shown in FIG. 7 can be reduced.

[0033]

As described above, according to the present invention, a multi-pole coil section made of an E-shaped magnetic material is provided, and a vertical deflection current is caused to flow through a coil wound around each leg of the E-shaped magnetic material, and the multi-pole is By connecting the variable resistors in parallel to both ends of the coil, the generated magnetic field becomes a magnetic field in the horizontal direction with respect to the electron beam, and the deflection of the electron beam is also only in the vertical direction, and it is connected in parallel to both ends of the multipole coil. By adjusting the variable resistance described above, the green line can be overlapped with the red line and the blue line on the CRT screen, and the deflection yoke with reduced misconvergence can be provided.

[Brief description of drawings]

FIG. 1 is a wiring diagram of a deflection yoke according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a multi-pole coil portion of the deflection yoke in the same embodiment.

FIG. 3 is a sectional view of a deflection yoke in the same embodiment.

FIG. 4 is a wiring diagram of a deflection yoke in the second embodiment of the present invention.

FIG. 5 is a schematic diagram of a modulation transformer of a deflection yoke in the second embodiment.

FIG. 6 is an explanatory view showing a position where an electron beam from an electron gun is converged.

FIG. 7 is an explanatory diagram showing bow-shaped misconvergence of a green line.

FIG. 8 is a sectional view of a conventional deflection yoke.

FIG. 9 is a wiring diagram of a conventional deflection yoke.

FIG. 10 is a schematic configuration diagram of a conventional pre-deflection coil unit.

FIG. 11 is a screen view of a cathode ray tube using a conventional deflection yoke.

FIG. 12 is a screen view of a cathode ray tube using a conventional deflection yoke.

[Explanation of symbols]

 20 vertical deflection coil 21 fixed resistance 22 multi-pole coil section 23 variable resistance 24, 25 E-type magnetic body 33 modulation transformer 34 primary coil 35 secondary coil 36 horizontal deflection coil 39 multi-pole coil section 40, 41 drum core 42 magnetic body

Claims (4)

[Claims] 1. A deflection yoke for a cathode ray tube having an electron gun for generating three electron beams arranged in a horizontal row, comprising a vertical deflection coil, a horizontal deflection coil and a support for supporting these deflection coils. A multi-pole coil portion including a pair of E-shaped magnetic bodies and a coil provided on each leg is provided, and the pair of E-shaped magnetic bodies are arranged to face each other on the outer peripheral side surface of the electron gun side end portion. When the vertical deflection current is positive, the coils provided in the multi-pole coil unit are connected in series and the vertical deflection coil unit and the multi-pole coil unit are connected so that a vertical deflection current flows through the multi-pole coil unit. Is configured such that the upper and lower legs of one E-shaped magnetic body are the S poles and the central leg thereof is the N pole, and the upper and lower legs of the other E-shaped magnetic body are the N poles and the central leg thereof is the S pole. The variable resistor in parallel at both ends of the multi-pole coil. Connected, the deflection yoke, characterized by being configured to connect the said vertical deflection coil unit multipole coil unit in series. 2. A deflection yoke for a cathode ray tube having an electron gun for generating three electron beams arranged in a horizontal row, comprising a vertical deflection coil, a horizontal deflection coil and a support for supporting these deflection coils. A multi-pole coil portion including a pair of E-shaped magnetic bodies and a coil provided on each leg is provided, and the pair of E-shaped magnetic bodies are arranged to face each other on the outer peripheral side surface of the electron gun side end portion. When the vertical deflection current is positive, the coils provided in the multi-pole coil unit are connected in series and the vertical deflection coil unit and the multi-pole coil unit are connected so that a vertical deflection current flows through the multi-pole coil unit. Is configured such that the upper and lower legs of one E-shaped magnetic body are the S poles and the central leg thereof is the N pole, and the upper and lower legs of the other E-shaped magnetic body are the N poles and the central leg thereof is the S pole. The modulation transformer at both ends of the multipole coil. The secondary coil is connected in parallel, the horizontal coil is connected to the secondary coil of the modulation transformer, and the vertical deflection current of the primary coil is changed by the horizontal deflection current flowing in the secondary coil of the modulation transformer. Deflection yoke characterized by. 3. The vertical deflection coil comprises a pair of coils,
The deflection yoke according to claim 1 or 2, wherein a fixed resistor is connected in parallel to each coil. 4. The vertical deflection coil comprises a pair of coils,
The deflection yoke according to claim 1 or 2, wherein a variable resistor is connected in parallel to each coil.