JP2000223048A - Deflecting yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify misconvergence adjusting work for a deflecting yoke mounted with a misconvergence correction device, and to reduce working hours and product fraction defective. SOLUTION: This deflecting yoke has a misconvergence correction device 1 wherein four horizontal-controlled coils 5a to 5d are wound around drum-type cores 6a to 6d respectively, pairs of the coils 5a and 5b and the coils 5c and 5d are arranged and disposed horizontally on both ends in the axial direction of a vertical control coil 3 wound around a drum-type core 4 connected to a vertical deflection coil 3 respectively, and magnets 7a and 7b polarised in the arranged axial direction of each coil are disposed outside the two pairs of the coils respectively and accommodated in a case 2. In the deflection yoke, distances between the horizontal-controlled coils 5a and 5b and the magnet 7a and between the horizontal-controlled coils 5c and 5d and the magnet 7b are adjustable.

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 for a color picture tube provided with an in-line type electron gun, and more particularly to a misconvergence in which misconvergence can be adjusted with high precision in a manufacturing stage of the deflection yoke. The present invention relates to a deflection yoke provided with a correction device.

[0002]

2. Description of the Related Art In an in-line type color picture tube, three electron beams emitted from an electron gun are not concentrated at one point by a uniform deflection magnetic field, and various misconvergences occur. To correct this misconvergence, the horizontal deflection magnetic field of the deflection yoke is used as a pincushion magnetic field, and the vertically oriented magnetic field is used as a barrel-type magnetic field to reduce the misconvergence. Cross misconvergence between the horizontal line and the blue line occurs.

Since it is very difficult to correct the horizontal line cross misconvergence by only controlling and adjusting the deflection magnetic field, the correction coil of the misconvergence correction device is used for the horizontal and vertical deflection coils of the deflection yoke. By connecting each of them and controlling the impedance of the deflection yoke, the occurrence of misconvergence is suppressed.

FIG. 6 is a view showing a conventional misconvergence correction device. FIG. 6A is a plan view, and FIG. 6B is a plan view with the upper case removed. In the figure, 1 is a misconvergence correction device, 2 is a case made of synthetic resin, and is composed of upper and lower divided cases 2a and 2b. Reference numeral 3 denotes a vertical control coil wound around the drum core 4 and is housed in a recess formed in the center of the case 2.
Reference numerals 5a to 5d denote horizontal controlled coils wound around the drum-shaped cores 6a to 6d. 7a, 7
b is a disk-shaped magnet magnetized in the thickness direction (the direction of the arrangement axis of each coil), housed in recesses formed at both ends of the case 2, and respectively provided by claws 8 a and 8 b formed in the case 2. The position is fixed by being pressed down in the axial direction.

FIG. 7 is a circuit diagram of a deflection yoke provided with a conventional misconvergence correction device. In the figure, 9
Reference numerals a and 9b denote vertical deflection coils, and the vertical control coils 3 are connected in series. 10a is a horizontal main deflection upper coil,
The horizontal controlled coils 5a and 5b are connected in series. 10
b is a horizontal main deflection lower coil, and the horizontal controlled coils 5c,
5d are connected in series.

Next, the operation principle of the misconvergence correction device will be briefly described. First, at the time when no current is flowing through the vertical control coil 3 (the screen center portion), the magnetic flux generated from the horizontal controlled coils 5a and 5b connected in series to the horizontal main deflection upper coil 10a and the horizontal controlled coil 5
The reactance X1 generated by the magnetic flux generated from the magnet 7a having the N poles a and 5b, the horizontal controlled coils 5c and 5d similarly connected in series to the horizontal main deflection lower coil 10b, and the magnet Reactance X2 created by the magnetic flux generated from 7b is substantially balanced (X1 ≒ X2).

However, as the current value of the vertical control coil 3 increases, the magnetic flux generated from the vertical control coil 3 becomes opposite to the bias magnetic flux generated from one of the right and left magnets, and cancels each other. The super-saturation state occurs because the magnetic flux is in the same direction as the bias magnetic flux generated from the
1 and X2 become unequal on the left and right, and the reactance of one horizontal controlled coil becomes larger than the reactance of the other horizontal controlled coil (X1 <X2 or X1> X
2). For this reason, the horizontal controlled coils 5a, 5b and 5c,
Upper and lower main deflection coils 10a, 10b connected in series to 5d
The magnetic field formed by the non-uniform current flowing is shaped like a letter C, and the blue beam is obliquely upward, the red beam is obliquely downward at the upper right corner of the screen, and the force in the opposite direction is applied at the upper left corner of the screen. Therefore, misconvergence is corrected.

[0008]

In the deflection yoke equipped with the above-described conventional misconvergence correction device, the mounting position of the magnet for supplying the magnetic bias is fixed at one place, so that the thickness and the magnetic flux density of the magnet at the time of manufacturing are fixed. In the misconvergence adjustment step in the manufacturing process of the deflection yoke, it is indispensable to attach the magnetic flux control sheet to the case 2a and adjust the misalignment in the deflection yoke.

This misconvergence adjustment operation is performed while looking at the screen. However, the operation of attaching the magnetic flux control sheet involves empirical trial and error, is complicated and has poor workability, and requires a long adjustment time. There is a problem that the above element is short-circuited. Further, if the magnetic flux control sheet is fixed with an adhesive, there is a problem that the adjustment cannot be performed again, and further, a problem that the rate of defective products becomes high in a screen adjustment step in manufacturing a color image receiving apparatus performed in combination with a color picture tube. There were also points.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a misconvergence correction for improving the accuracy of misconvergence adjustment, simplifying work, reducing work time, and reducing the product defect rate. It is an object to obtain a deflection yoke on which the device is mounted.

[0011]

A deflection yoke according to the present invention has a vertical control coil wound around a drum-shaped core connected to a vertical deflection coil. Two of the two horizontal controlled coils are respectively arranged side by side in the horizontal direction.
In a deflection yoke having a misconvergence correction device housed in a case in which a magnet magnetized in the arrangement axis direction of each of the coils is arranged outside a set of horizontal controlled coils, the magnet is It is supported by the case by a support mechanism configured to adjust the distance from the horizontal controlled coil.

The magnet support mechanism has a female screw formed on the inner peripheral surface at both ends of the case and a male screw engaged with the female screw formed on the outer peripheral surface. And a magnet having a tool insertion hole.

The magnet support mechanism has a female screw formed on the inner circumferential surface at both ends of the case and a male screw screwed to the female screw formed on the outer circumferential surface, and further formed on the side surface of the case. And a magnet cover in which a projection protruding from the formed hole is formed to house a magnet inside.

The magnet support mechanism has a female screw formed on the inner peripheral surface at both ends of the case and a male screw screwed to the female screw formed on the outer peripheral surface to house the magnet therein. Further, it is constituted by a magnet cover to which a rotary knob is attached coaxially.

The magnet support mechanism houses a magnet inside and has a knob portion protruding laterally, and slides the magnet cover formed at both ends of the case in the axial direction. And a storage portion that is movably stored and has a slot formed so that the knob portion is inserted through the side surface and protrudes.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a diagram showing a misconvergence correction device according to the first embodiment. FIG. 1A is a plan view, and FIG.
(B) is a plan view with the upper case removed, FIG. 1 (c) is a side view, and FIG. 1 (d) is a front view of the magnet. In the figure, 1 is a misconvergence correction device, 2 is a case made of synthetic resin, and is composed of upper and lower divided cases 2a and 2b. Reference numeral 3 denotes a vertical control coil wound around the drum core 4 and is housed in a recess formed in the center of the case 2. Reference numerals 5a to 5d denote horizontal controlled coils wound around the drum-shaped cores 6a to 6d, which are housed side by side in recesses formed outside the recesses formed in the center of the case 2. Reference numerals 7a and 7b denote disc-shaped magnets magnetized in the thickness direction (the direction of the arrangement axis of each coil). Male screws 20a and 20b are formed on the outer peripheral surface thereof and formed on the inner surfaces of both ends of the case 2. As shown in FIG. 1 (d), a polygonal insertion hole 2 for inserting a polygonal rotation adjusting jig into the center of the magnets 7a, 7b is screwed to the female screws 21a, 21b.
2a and 22b are formed. 23a and 23b are windows provided on the upper case 2a.

According to the first embodiment, the magnet 7
The horizontal controlled coils 5a, 5b, the magnet 7a, and the horizontal controlled coil 5c are inserted by inserting a rotation adjusting jig (not shown) into the insertion holes 22a, 22b of the horizontal controlled coils 5a, 7b.
, 5d and the magnet 7b can be finely adjusted. The windows 23a and 23b provided in the case 2a are:
After adjusting the positions of the magnets 7a and 7b, it is used when fixing with magnets or the like.

Embodiment 2 FIG. FIG. 2 is a view showing a second embodiment of the present invention, in which the same reference numerals as those in FIG. 1 indicate the same or corresponding portions, respectively. FIG. 2 (a) is a plan view, and FIG. FIG.
FIG. 2D is a front view of a magnet cover accommodating a magnet, FIG. 2E is a cross-sectional view thereof, and FIG. 2F is a side view thereof. In the figure, 25a, 2
Reference numeral 5b denotes a magnet cover that houses magnets 7a and 7b therein. Male screws 26a and 26b and protrusions 27a and 27b are formed on the outer periphery, and male screws 26a and 26b are formed.
b is a female screw 21 formed on the inner surface of both ends of the case 2
a, 21b, and the protrusions 27a, 27b are configured to protrude from windows 23a, 23b formed in the upper case 2a. 28a and 28b are magnets 7a,
7b.

According to the second embodiment, the protrusion 27
a and 27b are manually turned to remove the magnet cover 25.
a and 25b can be moved in the axial direction, and accordingly, the distance between the horizontally controlled coils 5a and 5b and the magnet 7a and the distance between the horizontally controlled coils 5c and 5d and the magnet 7b can be finely adjusted. The window 2 provided in the case 2a
3a and 23b are used when adjusting the positions of the magnets 7a and 7b and then fixing them with an adhesive or the like.

Embodiment 3 3 shows a third embodiment of the present invention. The same reference numerals as those in FIG. 2 denote the same or corresponding parts. FIG. 3 (a) is a plan view, and FIG. 3 (b) is an upper case. FIG. 3 (c) is a plan view in which is removed.
Is a side view, FIG. 3D is a front view of a magnet cover accommodating a magnet, FIG. 3E is a cross-sectional view thereof, and FIG. 3F is a side view thereof. In the figure, 30a, 3
Reference numeral 0b denotes a rotary knob, and the rotary knobs 30a and 30b have magnets 7a and 7 in magnet covers 25a and 25b.
After attaching b, it is attached coaxially.

According to the third embodiment, the rotary knob 3
0a and 30b are manually turned to remove the magnet cover 25.
a and 25b can be moved in the axial direction, and accordingly, the distance between the horizontally controlled coils 5a and 5b and the magnet 7a and the distance between the horizontally controlled coils 5c and 5d and the magnet 7b can be finely adjusted.

Embodiment 4 FIG. 4 is a view showing a fourth embodiment of the present invention, in which the same reference numerals as those in FIG. 3 indicate the same or corresponding parts, FIG. 4 (a) is a plan view, and FIG. FIG.
4D is a side view, FIG. 4D is a front view of a magnet cover containing a magnet, FIG.
(F) is a cross-sectional view thereof. In the figure, 31a, 3
Reference numeral 1b denotes a knob formed on the magnet covers 25a and 25b so as to protrude laterally of the case 2 from axially extending slots 32a and 32b formed between the upper case 2a and the lower case 2b. Is configured.

According to the third embodiment, the protrusion 31
By manually moving the a and 31b in the axial direction, the magnet covers 25a and 25b can be moved in the axial direction. Accordingly, the horizontal controlled coils 5a and 5b and the magnet 7a, the horizontal controlled coils 5c and 5d and magnet 7
The distance b can be finely adjusted.

[0024]

Since the present invention is configured as described above, it has the following effects.

On each side of the vertical control coil wound on the drum type core connected to the vertical deflection coil in the axial direction, two of the four horizontal controlled coils wound on the drum type core are respectively arranged horizontally. The misconvergence correction device is arranged in the case in a state where magnets magnetized in the arrangement axis direction of the respective coils are arranged outside the two sets of horizontally controlled coils. In the deflection yoke having the magnet, the magnet is supported by the case by a support mechanism configured to adjust the distance to the horizontal controlled coil, so that the accuracy can be improved by fine adjustment of misconvergence adjustment in the manufacturing process of the deflection yoke. , Simplifying work, improving workability,
The effect of shortening the working time can be obtained, and the failure rate of the set can be reduced without short-circuiting the peripheral circuit board elements during the adjustment.

[Brief description of the drawings]

FIG. 1 is a diagram showing a misconvergence correction device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a misconvergence correction device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a misconvergence correction device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a misconvergence correction device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram for explaining misconvergence of a screen corner during simultaneous magnetic field deflection.

FIG. 6 is a diagram showing a conventional misconvergence correction device.

FIG. 7 is a circuit diagram of a deflection yoke provided with a conventional misconvergence correction device.

[Explanation of symbols]

1 misconvergence correction device, 2 storage case, 2
a upper case, 2b lower case, 3 vertical control coils, 4, 6a to 6d drum core, 5a to 5d horizontal controlled coils, 7a, 7b magnets, 20a, 20
b, 26a, 26b Male screw, 21a, 21b Female screw, 22a, 22b Insertion hole of rotary jig, 23a, 23
b window, 25a, 25b magnet cover, 27a,
27b protrusion, 28a, 28b storage, 30a, 3
0b rotary knob, 31a, 31b knob, 32
a, 32b Slot.

Claims (5)

[Claims] 1. Two axially controlled coils, each of which is wound around a drum-shaped core, are provided on both sides in the axial direction of a vertical control coil wound around a drum-shaped core connected to a vertical deflection coil. Misconvergence correction which is arranged in a horizontal direction and which is housed in a case in which magnets magnetized in the arrangement axis direction of the respective coils are arranged outside the two sets of horizontally controlled coils, respectively. A deflection yoke having a device, wherein the magnet is supported by the case by a support mechanism configured to adjust a distance from the horizontal controlled coil. 2. A magnet support mechanism comprising: a female screw formed on an inner peripheral surface at both ends of a case; and a male screw screwed to the female screw formed on an outer peripheral surface. 2. The deflection yoke according to claim 1, further comprising a magnet having an insertion hole for the tool. 3. A magnet support mechanism, wherein a female screw formed on an inner peripheral surface at both ends of a case, and a male screw screwed to the female screw are formed on an outer peripheral surface, and further formed on a side surface of the case. 2. The deflection yoke according to claim 1, further comprising: a magnet cover having a projection formed therein and projecting from the hole and housing a magnet therein. 4. A magnet support mechanism includes: a female screw formed on an inner peripheral surface at both ends of a case; and a male screw screwed to the female screw formed on an outer peripheral surface to house the magnet therein. 2. The deflection yoke according to claim 1, further comprising a magnet cover to which a rotary knob is attached coaxially. 5. A magnet supporting mechanism, wherein a magnet is housed therein and has a knob portion extending laterally, and a magnet cover formed at both ends of a case slides the magnet cover in the axial direction. 2. A deflection yoke according to claim 1, wherein said deflection yoke comprises a storage portion movably stored and having a long hole formed by projecting said knob portion through said side surface.