JPH1092340A - Deflection yoke and cathode-ray tube display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cancel unnecessary radiation magnetic fields to be leaked from extension lines each other and reduce a leakage quantity by disposing extension lines of a horizontal deflection coil of a deflection yoke in proximity and flowing a current in the reverse direction. SOLUTION: Two extension lines 2c and 2d connecting connection terminals 3 and 4 of connector lead wires 5 and 6 and a lower horizontal deflection coil 1b are disposed in proximity, and currents flowing in respective extension lines are made to flow in the reverse directions. Thereby, unnecessary radiation magnetic fields 7 to be leaked from the deflection coil extension lines 2 are canceled each other, a super-low frequency magnetic field VLMF can be reduced. By stranding the extension wires 2 each in close to each other, the VLMF can be further reduced, and unnecessary radiation magnetic filed can be almost eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke characterized by reducing a magnetic field leaking from a deflection coil wound around a deflection yoke of a display monitor or the like, in particular, an unnecessary radiation magnetic field leaking from a horizontal deflection coil. is there.

[0002]

2. Description of the Related Art A requirement that an unnecessary radiation magnetic field generated around a display device should be reduced to a certain value or less has an adverse effect on a human body or an adverse effect on electronic equipment existing in the unnecessary radiation magnetic field. It's happening because it prevents interaction. Particularly, for unnecessary radiation magnetic fields in a low frequency band of 400 kHz or less, for example, MPR-
There are guidelines called 3 standards, 50 cm around the display device and 30 c from the display tube surface.
m], the extremely low frequency magnetic field (ELMF) from 5 Hz to 2 kHz is 200 [nT] or less, and the extremely low frequency magnetic field (VLMF) from 2 kHz to 400 kHz is 25 [nT] or less. The standard is set so that

Since the main source of the unnecessary radiation magnetic field in the low frequency band is the deflection yoke, a method for reducing the unnecessary radiation magnetic field is often provided by providing a means for generating a magnetic field for canceling the unnecessary radiation magnetic field in the deflection yoke. Proposed.

As a specific example, Japanese Patent Application Laid-Open No. Hei 3-28902
No. 9 publication. This is because the first cancellation coil connected in series or parallel with the horizontal deflection coil and the second cancellation coil connected in series or parallel with the vertical deflection coil are arranged in the deflection yoke, and unnecessary radiation from the deflection yoke is arranged. This is a method in which an unnecessary radiation magnetic field generated from the deflection yoke is prevented by generating a canceling magnetic field in a direction opposite to the magnetic field.

[0005]

In the above-mentioned conventional method, measures are taken against unnecessary radiation magnetic fields leaking from the horizontal deflection coil, but no measures are taken against unnecessary radiation magnetic fields leaking from the lead wire of the horizontal deflection coil. Has not been done. Regarding the measurement of the unnecessary radiation magnetic field according to the current guideline, the unnecessary radiation magnetic field leaking from the lead wire of the horizontal deflection coil is not particularly problematic because it is a very small component, but as the guidelines become more strict. The unnecessary radiation magnetic field component leaking from the lead wire of the horizontal deflection coil has a great effect.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to eliminate unnecessary radiation magnetic field components leaking from a horizontal deflection coil lead wire and reduce unnecessary radiation magnetic fields of a horizontal deflection coil. It is in.

[0007]

To achieve the above object, the present invention employs the following configuration.

A deflection yoke, which comprises a horizontal deflection coil for deflecting an electron beam, a vertical deflection coil and a core, and is attached to a cathode ray tube, supplies a deflection current flowing through a lead wire connecting the horizontal deflection coil to a connector lead. A deflection yoke which flows in opposite directions to each other and in which the lead wires are arranged close to each other.

In a deflection yoke which is composed of a horizontal deflection coil for deflecting an electron beam, a vertical deflection coil and a core, and which is attached to a cathode ray tube, a lead wire for connecting the horizontal deflection coil and a connector lead wire is used. A deflection yoke which forms a winding wheel and is disposed above and below the neck side of the deflection yoke to generate a magnetic field in a direction opposite to the direction of the unnecessary radiation magnetic field from the horizontal deflection coil.

Further, in a deflection yoke which is composed of a horizontal deflection coil for deflecting an electron beam, a vertical deflection coil and a core, and which is attached to a cathode ray tube, a deflection flowing to a lead wire connecting the horizontal deflection coil and a connector lead wire. The current flows in opposite directions, and the lead wires are arranged close to each other, and a winding wheel is formed using the lead wires, and is arranged above and below the neck side of the deflection yoke,
A deflection yoke for generating a magnetic field in a direction opposite to a direction of the unnecessary radiation magnetic field from the horizontal deflection coil;

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a rear view of a horizontal deflection coil of a deflection yoke according to a first embodiment of the present invention. Reference numeral 1a denotes an upper part of the horizontal deflection coil, and 1b denotes a lower part of the horizontal deflection coil. 2 is a horizontal deflection coil lead wire, 2a is a horizontal deflection coil upper portion 1a and the HOT side of a connector lead wire, and 2b is a horizontal deflection coil upper portion 1a.
2c are the horizontal deflection coil lower part 1b and the COL side of the connector lead wire, 2d
Is HOT of the lower part of horizontal deflection coil 1b and connector lead wire
Side and each is connected.

Reference numerals 3 and 4 denote connection terminals for connector lead wires. Reference numeral 3 is connected to the HOT side 5 of the connector lead wire, and reference numeral 4 is connected to the COLD side 6 of the connector lead wire. In the embodiment of the present invention, the VLM is reduced by minimizing the unnecessary radiation magnetic field leaking from the horizontal deflection coil lead wire 2.
F is to be reduced.

First, the effect of the unnecessary radiation magnetic field leaking from the horizontal deflection coil lead wire 2 on the VLMF will be described. FIG. 2 is a rear view showing an example of a conventional horizontal deflection coil. The deflection current supplied from the connector lead wire HOT terminal 3 to the horizontal deflection coil 1 flows through the horizontal deflection coil lead wires 2c and 2d in the directions indicated by arrows in FIG.

FIG. 3 shows an equivalent circuit diagram at this time. In the figure, reference numeral 7 denotes an unnecessary radiation magnetic field leaking from the horizontal deflection coil lead wires 2c and 2d when a deflection current flows through the horizontal deflection coil 1, and reference numeral 8 denotes an unnecessary radiation magnetic field leaking from the horizontal deflection coil 1. This is an unnecessary magnetic field generated and leaked particularly at the neck side portion of the horizontal deflection coil, for example, in the direction shown in FIG.

The VLMF is obtained from the three components of the horizontal direction (Bx), the vertical direction (By), and the tube axis direction (Bz) according to equation (1).

VLMF = √ (Bx ² + By ² + Bz ² ) (1) Here, the By component is an unnecessary radiation magnetic field 8 leaking from the horizontal deflection coil 1, and the Bz component is an unnecessary radiation magnetic field leaking from the horizontal deflection coil lead wire 2. 7

Conventionally, the unnecessary radiation magnetic field 7 leaking from the horizontal deflection coil lead wire 2 has a smaller component than the unnecessary radiation magnetic field 8 leaking from the horizontal deflection coil 1. Attention has been paid only to the unnecessary radiation magnetic field 8 that leaks. However, as the guidelines become stricter, the VLMF of the unnecessary radiation magnetic field 7 leaking from the horizontal deflection coil lead wire 2 is increased.
In the case where only the unnecessary radiation magnetic field 8 leaking from the horizontal deflection coil 1 is taken, there is a problem that the guideline is not satisfied due to the influence of the unnecessary radiation magnetic field 7 leaking from the horizontal deflection coil lead wire 2. Was.

Therefore, in the first embodiment of the present invention, the unnecessary radiation magnetic field 7 leaking from the horizontal deflection coil lead wire 2 is provided.
So that the horizontal deflection coil lead wire 2
The directions of the deflection currents flowing in are set to be opposite to each other and to be close to each other. As in the structure shown in FIG. 1 of the present embodiment, two lead wires 2c and 2d connecting the connection terminals 3 and 4 of the connector lead wires and the lower horizontal deflection coil 1b.
Are arranged close to each other and the directions of the currents flowing through the respective lead wires are made opposite to each other, so that unnecessary radiation magnetic fields 7 leaking from the deflection coil lead wire 2 cancel each other. Becomes smaller. Therefore, even if the above guidelines become stricter, the influence of the unnecessary radiation magnetic field 7 leaking from the horizontal deflection coil lead wire 2 as in the related art is eliminated, and the VLMF can be reduced.

As described above, according to the first embodiment of the present invention, the unnecessary radiation magnetic field leaking from the horizontal deflection coil lead wire 2 can be reduced.

Further, by arranging the horizontal deflection coil lead wires 2 as a specific form of the close arrangement, that is, interlacing each other, that is, twisting, the unnecessary radiated magnetic field leaking from the horizontal deflection coil lead wire 2 is less than in the first embodiment. Needless to say, VLMF can be further reduced since it is eliminated.

Next, a second embodiment of the present invention will be described. A feature of the present invention is that a winding wheel is formed by the horizontal deflection coil lead wire 2 and arranged vertically so as to generate a magnetic field opposite to the unnecessary radiation magnetic field 8 described above leaking from the horizontal deflection coil 1. That is, the unnecessary radiation magnetic field 8 is canceled.

FIG. 4 shows a rear view of a horizontal deflection coil according to a second embodiment of the present invention. Reference numeral 10 denotes a winding wheel formed by the horizontal deflection coil lead wire 2, which is disposed, for example, at the tip of the deflection yoke on the neck side. The lead 2 for inputting current to the deflection yoke is arranged on the neck side of the deflection yoke.
Further, since the unnecessary radiation magnetic field 8 is generated on the neck side of the deflection yoke, the lead wire 2 is taken out and FIG.
The winding wheel 10 can be formed at the location on the neck side shown in FIG. 1 and no extra lead wire passage is required for forming this winding wheel. Reference numeral 11 denotes a magnetic field generated from the winding wheel 10 formed by the horizontal deflection coil lead wire. As described above, the VLMF can be canceled by the magnetic field 11 generated from the winding wheel 10 formed by the horizontal deflection coil lead 2, that is, the unnecessary radiation magnetic field leaking from the horizontal deflection coil lead 2.

As described above, according to the second embodiment of the present invention, the VLMF is reduced by effectively utilizing the magnetic field leaking from the horizontal deflection coil lead wire 2 without using a new VLMF countermeasure. Can be.

Next, a third embodiment of the present invention will be described. The feature of the present embodiment is that the VLMF improvement effect is improved by taking measures against unnecessary radiation magnetic fields leaking from the horizontal deflection coil lead wire 2 described in the first embodiment, and the horizontal direction described in the second embodiment. The purpose is to reduce the VLMF by forming a winding wheel with the deflection coil lead wire 2. As a specific structure, for example, a part of the lead wires 2c and 2d arranged close to each other and through which the opposite currents shown in FIG. 1 flow, or the lead wires 2a and 2b are drawn, and this is used as a winding wheel. As shown in FIG. 4, while forming a winding wheel 10 on the upper and lower sides to form a canceling magnetic field 11,
As shown in FIG. 1, the unnecessary radiation magnetic field due to the lead wire is canceled out.

Thus, it is possible to simultaneously satisfy the two effects of improving the VLMF improvement effect and reducing the VLMF.

Although the above description has been made on the premise that the horizontal deflection coil lead wire is on the neck side of the horizontal deflection coil, the VLMF improvement can also be performed on the opening side of the horizontal deflection coil by taking measures against the horizontal deflection coil lead wire. Needless to say, the effect is improved.

[0028]

As described above, according to the present invention, the unnecessary radiation magnetic field leaking from the deflection yoke, in particular, the unnecessary radiation magnetic field 7 leaking from the lead wire of the deflection coil and the unnecessary radiation leaking from the neck side of the deflection coil are generated. The magnetic field 8 can be reduced.

[Brief description of the drawings]

FIG. 1 is a rear view of a horizontal deflection coil according to a first embodiment of the present invention.

FIG. 2 is a rear view showing an example of a conventional system.

FIG. 3 is an equivalent circuit diagram of a conventional system.

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 horizontal deflection coil 2 horizontal deflection coil lead wire 3 HOT side terminal 4 COLD side terminal 5 connector lead HOT side 6 connector lead COLD side 7 unnecessary radiation magnetic field from horizontal deflection coil lead wire 8 unnecessary radiation magnetic field leaking from horizontal deflection coil 9 Deflection yoke 10 Winding wheel created by horizontal deflection coil lead wire 11 Negating magnetic field

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Souichi Sakurai 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Division of Hitachi, Ltd. (72) Inventor Hiroshi Shiminaga Totsuka-ku, Yokohama-shi, Kanagawa 292 Yoshidacho Hitachi Multimedia Systems Development Div. (72) Inventor Yoshio Sato 3300 Hayano Mobara-shi, Chiba Pref.Electronic Devices Division, Hitachi, Ltd. (72) Inventor Masao Ohara Majo, Mizusawa-shi, Iwate 1 Kitano character Hitachi Media Electronics Co., Ltd.

Claims (5)

[Claims] 1. A deflection yoke comprising a horizontal deflection coil, a vertical deflection coil, and a core for deflecting an electron beam and attached to a cathode ray tube, a deflection flowing to a lead wire connecting the horizontal deflection coil and a connector lead wire. A deflection yoke, wherein currents flow in opposite directions and the lead wires are arranged close to each other. 2. The deflection yoke according to claim 1, wherein the lead wires of the horizontal deflection coil are twisted with each other. 3. A deflection yoke, comprising a horizontal deflection coil for deflecting an electron beam, a vertical deflection coil and a core, and attached to a cathode ray tube, using a lead wire for connecting the horizontal deflection coil and a connector lead wire. A deflection yoke, wherein a winding wheel is formed and arranged above and below the neck side of the deflection yoke to generate a magnetic field in a direction opposite to a direction of an unnecessary radiation magnetic field from the horizontal deflection coil. 4. A deflection yoke comprising a horizontal deflection coil, a vertical deflection coil, and a core for deflecting an electron beam and attached to a cathode ray tube, a deflection flowing to a lead wire connecting the horizontal deflection coil and a connector lead wire. An electric current is caused to flow in opposite directions, and the lead wires are arranged close to each other. A winding wheel is formed using the lead wires and arranged above and below the neck side of the deflection yoke. A deflection yoke for generating a magnetic field in a direction opposite to a direction of a radiation magnetic field. 5. A cathode ray tube display device comprising the deflection yoke according to claim 1.