JPH06103925A - Deflection yoke - Google Patents

Abstract

PURPOSE:To prevent a discharge of the accumurated charge and to generate no scratch noise by providing a non-magnetic barrier between a clamping ring to fasten a deflection coil to a cathode-ray tube, and a coma corrector or a coma coil. CONSTITUTION:To a deflection coil, a clamp ring 1 to fasten a horizontal deflection coil and a vertical deflection coil 4 to a cathode-ray tube is provided. Between the clamp ring 1 and a coma coil 2, a non-magnetic barrier 8 is provided, and a discharge of the electric charge accumulated to the coil 2 is prevented. The same phenomenon is applied to a coma corrector to correct the sensitivity of a color convergence, and a deflection coil generating no scratch noise by preventing the discharge, and preventing a deterioration of the image quality can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke equipped with a stopper and a coma collector or a coma coil for correcting the sensitivity of green convergence in combination with a cathode ray tube used in a television receiver or the like.

[0002]

2. Description of the Related Art In recent years, the deflection yoke of a cathode ray tube used in a color television receiver or the like has been required to improve the accuracy of convergence correction because of the demand for high image quality.

A conventional deflection yoke will be described below with reference to the drawings. As shown in FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8, in the conventional deflection yoke, the vertical deflection coil 4 and the horizontal deflection coil 5 are coma coils 2 or 3 in which electric wires are wound around a magnetic body. A magnetic piece having a function of adjusting at least one electron beam of the two beams is bent together with a coma collector 3 and is fastened to a neck of a cathode ray tube (not shown) using a stopper 1.
Here, the fastener 1 shown in FIG.
The neck tightening screw 1a shown in FIG.
It is configured to be inserted into the neck tightening band 1b shown in (b). Further, as shown in FIG. 8, when the deflection yoke for deflecting the electron beam 12 of the cathode ray tube uses the coma collector 3 together with the vertical deflection coil 4 and the horizontal deflection coil 5, the coma collector 3 absorbs the magnetic field. A small cover 11 composed of a piece 9 and a magnetic field forming projection 10.
It is fastened to the neck of the cathode ray tube using the neck fastening band 1b provided on the.

The relationship and operation of each component will be described below. First, in the conventional deflection yoke shown in FIGS. 4, 5, and 6, the neck of the cathode ray tube is inserted inside the stopper 1, and the deflection yoke is fastened using the stopper 1.

As is apparent from FIGS. 5 and 6, the stopper 1
Is very close to the top coil 2 or top collector 3. In principle, in the coma coil 2 or the coma collector 3, the gap between the stopper 1 and the coma coil 2 or the coma collector 3 is zero, that is, when the gap is in contact with the coma coil 2 or the coma collector 3, the coma coil 2 or the coma collector 3 is closer to the electron beam. Good, but then stop 1
However, as shown in FIG. 7, it is composed of a neck tightening screw 1a and a neck tightening band 1b. By inserting the screw 1a into the band 1b and screwing in the screw 1a,
The band 1b can be tightened by applying a force in the direction of the inward arrow shown in FIG. 7 (c), but when the top coil 2 or the top collector 3 and the fastener 1 are in contact,
This tightening work becomes impossible, or when the screw 1a is rotated and tightened by a screwdriver in the process of tightening the stopper 1, the screwdriver comes into contact with the top collector 3, the top collector 3 is deformed, or the top Contact the coma coil 2 and damage the copper wire for the coma coil, so that the deflection yoke cannot be fastened to the cathode ray tube. For this reason, usually this top coil 2 or top collector 3 and the stopper 1
Leave at least 0.8 mm between and.

[0006]

However, in the above-mentioned conventional structure, as shown in FIG.
In the case of the deflection yoke in which is installed, because of the magnetic field change when the television receiver is switched on, that is, when the electron beam 12 emitted from the electron gun of the cathode ray tube does not exist (state not switched on), When the electron beam 12 is present (switched on) and the electron beam 12 is a current having a negative charge, the magnetic substance around the electron beam is charged with a positive charge by electrostatic induction.
In this case, since the deflection yoke is located closest to the electron beam 12, the stopper 1 having the lowest resistance in the deflection yoke.
In general, the neck tightening screw 1b and the magnetic field forming projection 10 of the top collector 3 are electrically charged.

However, since the coma coil 2 or coma collector 3 near the stopper 1 of the deflection yoke generates a magnetic field by the vertical deflection current, it is temporarily charged by electrostatic induction by the electron beam 12. Immediately, since the vertical deflection magnetic field is an alternating magnetic field having positive and negative magnetic fields, it is neutralized and eventually regarded as ground.
However, the fastener 1 is charged with a positive charge having a polarity different from that of the electron beam charge. Therefore, as a result, only the coma collector 3 or the coma coil 2 is charged.

As described above, when there are a magnetic material charged with electric charges and a magnetic material regarded as ground in the vicinity, discharge is generated between the two magnetic materials as indicated by an asterisk in FIG.
That is, a discharge phenomenon occurs between the neck tightening band 1b and the magnetic field forming projection 10 of the coma coil 2 or the coma collector 3. However, this discharge phenomenon physically becomes a high-voltage discharge that travels over a spatial distance, and is the same as what is generally called a corona discharge. Therefore, the discharge phenomenon jumps into a television signal, and the television screen is displayed as shown in FIG. It appears as scratch noise 7 as shown in. This has a problem that the quality of the television screen is remarkably deteriorated.

The present invention solves the above-mentioned problems of the prior art, and provides a deflection yoke in which charges accumulated in a stopper for fastening the deflection yoke to a cathode ray tube are not discharged to a coma collector or a coma coil. The purpose is to

[0010]

In order to achieve the above object, a deflection yoke of the present invention comprises a metal stopper for fastening a horizontal deflection coil and a vertical deflection coil to a cathode ray tube, and a coma collector. Alternatively, it has a configuration in which a nonmagnetic barrier is disposed between the top coil and the stopper.

[0011]

According to the present invention, in the above-mentioned construction, the non-magnetic barrier prevents the electric charges charged in the stopper for fastening the horizontal deflection coil and the vertical deflection coil from the cathode ray tube from discharging to the coma collector or the coma coil. And then
Therefore, the problem of degrading the screen quality due to scratch noise on the television screen does not occur.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1, 2 and 3, the deflection yoke of this embodiment has a vertical deflection coil 4 and a horizontal deflection coil 5, a coma coil 2 or a coma collector 3 and a metal stopper 1. A nonmagnetic barrier 8 is disposed between the two. That is, when the deflection yoke fixed to the neck of the cathode ray tube (not shown) through which the electron beam 12 flows is provided with the coma collector 3, as shown in FIG. 3, the coma collector 3 forms a magnetic field with the magnetic field absorption piece 9. The barrier 8 is provided between the magnetic field forming projection 10 and the neck tightening screw 1a of the fastener 1.

The relationship and operation of each component will be described below. First, a deflection yoke using the coma collector 3 will be described. As shown in FIGS. 2 and 3, the role of the coma collector 3 is to take in the vertical deflection magnetic field leaked to the outside of the deflection yoke of the vertical deflection coil 4 from the magnetic field absorption piece 9 and to place the magnetic field in the deflection yoke neck portion. It is diverged by the forming projections 10. Therefore, a vertical magnetic field having positive and negative poles is flowing through the top collector 3. However, as described in the prior art, when the television set is switched on to the metallic stopper 1, the static electricity having a voltage of about 1 kV is generated by the electron beam 12 emitted from the electron gun of the cathode ray tube. Is charged. Generally, to discharge a voltage of 1 kV, 1 mm
It suffices if there is a conductor having a low electric resistance at intervals of about the same or less.
Therefore, as shown in FIGS. 2 and 3, between the top collector 3 and the neck tightening band 1b of the fastener 1,
A barrier 8 made of a non-magnetic material such as plastic is set, and the height of the barrier 8 is set to the magnetic field forming projection 10 of the top collector 3 and the neck tightening band 1 of the fastener 1.
If the extension distance to b is set to 1 mm or more, corona discharge does not occur between the top collector 3 and the stopper 1. That is, static electricity having a positive pole charged in the neck tightening band 1b attracts negative charges to the coma collector magnetic field forming projection 10 by electrostatic induction. Since there is a barrier 8 made of a non-magnetic material between 10, it is necessary to draw the trajectory of the arrow shown in the figure in order to discharge. That is, the spatial distance between the neck tightening band 1b and the coma collector magnetic field forming projection 10 becomes much longer than the linear distance, and therefore, there is no chance of generating corona discharge. That is, the deflection yoke of the present invention is in a state in which the neck tightening band 1b is positively charged and the coma collector magnetic field forming projection 10 is still negatively charged without causing discharge. However, since this charge is static electricity, there is no effect even in a charged state.

Since the barrier 8 is not particularly limited in its material as long as it is a non-magnetic material, the horizontal deflection coil 5 is used in this case.
As shown in FIG. 3, a part of an insulating frame (not shown) for holding the beam or a deflection yoke body is added to a small cover 11 used for fixing the deflection yoke body to the cathode ray tube. This can be achieved without lowering the assembly workability and the workability of assembling the deflection yoke into the cathode ray tube.

The deflection yoke having the coma collector 3 has been described above, but the same applies to the case where the coma coil 2 is used. Instead of the coma collector 3, a non-magnetic material is used between the magnetic material for the coma coil and the neck tightening band 1b. A body barrier 8 should be installed.

[0017]

As is apparent from the above embodiments, according to the present invention, the electric charge charged in the stopper for fastening the horizontal deflection coil and the vertical deflection coil to the cathode ray tube is discharged to the coma collector or the coma coil. It is possible to realize an excellent deflection yoke that prevents the deterioration of the screen quality due to the occurrence of scratch noise on the television screen by performing a role of preventing the non-magnetic material barrier.

[Brief description of drawings]

FIG. 1 is an external perspective view of a deflection yoke having a coma coil according to an embodiment of the present invention.

FIG. 2 is a front view of a deflection yoke having a coma collector according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of the deflection yoke and a charge charging diagram.

FIG. 4 is an external perspective view of a deflection yoke having a conventional coma coil.

FIG. 5 is a front view of a deflection yoke having a conventional coma coil.

FIG. 6 is a front view of a deflection yoke having a conventional coma collector.

[Fig. 7] Assembly drawing of deflection yoke stopper

FIG. 8 is a cross-sectional view of a main part of a conventional deflection yoke and a charge charging diagram.

FIG. 9 is a television screen diagram of scratch noise caused by a deflection yoke.

[Explanation of symbols] 1 stopper metal 2 coma coil 3 coma collector 4 vertical deflection coil 5 horizontal deflection coil 8 barrier 12 electron beam

Claims (1)

[Claims] 1. A horizontal deflection coil and a vertical deflection coil mounted on a cathode ray tube having three electron beams, and a magnetic piece having a function of adjusting at least one electron beam among the three electron beams is bent. A coma coil or a coma coil formed by winding an electric wire around a magnetic material, and a stopper for fastening the horizontal deflection coil and the vertical deflection coil to the cathode ray tube. A deflection yoke having a non-magnetic barrier between them.