JPH03112039A - Deflection yoke - Google Patents

Abstract

PURPOSE:To reduce the vibration noise generated by a deflection yoke by providing a cushion material with vibration absorbing characteristic between a magnetic piece and a separator holding a horizontal deflecting coil. CONSTITUTION:A deflection yoke for a cathode-ray tube is constituted of a horizontal deflecting coil 1, a vertical deflecting coil 2 supported by a ferrite core 3, a separator 4 holding the coil 1, and a rear magnetic piece 5 fitted on the separator 4. A cushion material 100 with vibration absorbing characteristic is provided between the magnetic piece 5 and the separator 4. When the cushion material 100 is provided, the magnetic piece 5 generates vibration via the deflection magnetic field, but this vibration is absorbed by the cushion material 100, the vibration of the separator 4 is suppressed, thus the vibration noise of the deflection yoke is sharply reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a deflection yoke used in cathode ray tubes, particularly color cathode ray tubes.

[Conventional technology]

Conventional deflection yokes for color cathode ray tubes (hereinafter abbreviated as CRT), particularly self-convergence type deflection yokes, have the following two important functions.

First, there is the convergence function, which concentrates the three electron beams emitted from the electron gun sealed in the neck of the CRT over the entire screen, and the horizontal deflection function, which suppresses the pincushion-shaped distortion that occurs on the left and right sides of the screen. There is a semi-pinless function that eliminates the need for current correction or reduces the amount of correction current as much as possible. In order to achieve the above convergence function, the horizontal deflection magnetic field has a bin magnetic field distribution as shown in Figure 7(a).
Further, the horizontal deflection coil 1 and the vertical deflection coil 2 are shaped so that the vertical deflection magnetic field produces lines of magnetic force having a barrel magnetic field distribution as shown in FIG. 7(b). However, the vertical deflection magnetic field having a barrel magnetic field distribution acts in a direction that increases left and right pincushion distortion, resulting in the result shown in Fig. 8 (
As shown in b), a large left-right pincushion distortion remains.In order to improve this, a strong barrel magnetic field distribution is applied to the rear side of the deflection yoke near the electron gun in the vertical deflection magnetic field distribution, and also to the fluorescent surface. This problem was solved by creating a strong bin magnetic field distribution on the front side of the nearby deflection yoke.

However, it has been extremely difficult to form the magnetic field distribution as described above only by the winding distribution of the coil. Therefore, it was possible to achieve the magnetic field distribution as described above using the method disclosed in Japanese Patent Application Laid-Open No. 62-76140 as shown in FIG. Diagram (a)
As shown in (b), two rear magnetic pieces 5 are provided on the rear side of the separator 4, one above the other, and four front magnetic pieces 8 are provided on the front side at diagonal positions at each of the four corners. . By providing a magnetic piece with high magnetic permeability in the vertical deflection magnetic field, it is easy to create a strong barrel magnetic field distribution on the rear side and a strong bottle magnetic field distribution on the front side, as shown in Figure 5 (a) and (b). As a result, with this deflection yoke, it has become possible to create a screen with small left and right pincushion distortion as shown in FIG. 8(a) while maintaining the convergence function.

[Problem to be solved by the invention]

In the deflection yoke having the magnetic piece shown in FIG. 4 as described above, the magnetic piece is adhesively fixed to a predetermined position of the separator with adhesive 7 as shown in FIGS. 6(a) and b), and then the magnetic piece is The surface of the piece is protected and fixed by covering it with tape 6. However, with this fixing method, the magnetic pieces are exposed to a vertically deflecting magnetic field, and the magnetic pieces are excited to vibrate by the magnetic field, and the vibrations of the magnetic pieces are transmitted to some surfaces of the separator to which they are adhesively fixed, causing them to oscillate together. It was emitting vibration noise.

This vibration noise leaking from the deflection yoke has become a problem in recent years as television receivers have become larger, with higher image quality, and higher sound quality. Above all,
In the above-mentioned deflection yoke provided with a magnetic piece, the magnetic piece is exposed to a vertical deflection magnetic field, so the magnetic piece vibrates at a vertical deflection period (generally 60 Hz), and reducing the vibration noise has been an issue.

The present invention has been made to solve the above-mentioned problems, and provides a deflection yoke that can maintain quiet operation without generating vibration noise even in a deflection yoke that has a magnetic piece exposed to a deflection magnetic field. The purpose is to

[Means to solve the problem]

In the deflection yoke according to the present invention, a cushioning material having vibration-absorbing properties is provided between the magnetic piece and the separator in order to prevent the vibration of the magnetic piece caused by the deflection magnetic field from being transmitted to the separator.

Further, the deflection yoke according to the present invention is one in which a curable fluid material such as epoxy resin or silicone resin is injected and filled into a small part of the gap containing the magnetic piece generated between the separator and the core.

[Effect]

In the deflection yoke according to the present invention, by providing a cushioning material having vibration-absorbing properties between the magnetic piece and the separator, it is possible to reduce the phenomenon in which the vibration of the magnetic piece is transmitted to the separator, and almost eliminate vibration noise from the separator. , vibration noise as a deflection yoke is significantly reduced. In addition, the deflection yoke according to the present invention has a magnetic piece formed by injecting and filling at least a part of the gap containing the magnetic piece between the separator and the core with a hardening fluid material such as epoxy resin or silicone resin. is completely adhesively fixed onto the separator, the deflection margin of the separator is reduced, vibration of the magnetic piece and the separator is suppressed and reduced, and vibration noise from the deflection yoke is reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view including a broken surface of a deflection yoke showing an embodiment of the present invention. In the figure, 1 is a horizontal deflection coil, 2 is a vertical deflection coil, 3 is a ferrite core, 4 is a separator, 5 is a rear magnetic piece, and 100 is a cushioning material.

FIG. 2 shows a sectional view showing the magnetic piece mounting structure according to the present invention. 4 is a separator, and 6 is a tape.

In this way, when a cushioning material is provided between a magnetic piece and a separator, the magnetic piece causes vibration due to the deflection magnetic field (mainly a vertical deflection magnetic field), but this vibration is absorbed by the cushioning material. By suppressing the vibration of the separator which was vibrating together with the deflection yoke, the vibration noise of the deflection yoke is significantly reduced.

As for the material of the cushioning material, a soft rubber material is most effective, but it is not limited to any material as long as it has the property of absorbing vibrations, and it may be used as a cushioning material.

Further, as the cushioning material according to the above embodiment, an adhesive tape or double-sided adhesive tape may be used for the separator in consideration of workability, and after pasting it, a magnetic piece may be fixed and bonded thereon. It has the same effect as.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a side view including a broken surface of a deflection yoke according to a second embodiment of the present invention.

In the figure, the same components as in the above embodiment shown in FIGS. 1 and 2 are given the same symbols, and their explanations will be omitted. 200
is a hardening fluid material such as epoxy resin or silicone resin.

After fixing the magnetic pieces 5 and 8 at predetermined positions on the separator 4, the curable fluid substance 200 is injected through the rear opening 101 or the front opening 102 formed between the ferrite core 3 and the separator 4, and the separator 4 and the ferrite core 3 is filled with a curable fluid substance 200 and hardened.

However, when injecting the curable fluid material 200, one of the openings not used for injection is sealed with tape or a non-flowing material to prevent resin from leaking.

In the deflection yoke manufactured in this way, the magnetic pieces 5 and 8 are completely adhesively fixed on the separator 4, so that the magnetic pieces 5 and 8 do not vibrate under the influence of the vertical deflection magnetic field.
The separator 4 is also no longer affected. Also, separator 4
The separator 4
Vibration noise emitted from the system is suppressed and reduced.

In the above embodiment, the deflection yoke is described in which the magnetic pieces are provided at both the rear and front parts, but the magnetic pieces may be only the rear magnetic piece or only the front magnetic piece.

Furthermore, although the vertical deflection coil in the above embodiment has been described as having a so-called toroidal winding, in which the wire is wound directly around a ferrite core, the present invention is not limited to this, and a saddle-shaped vertical deflection coil may be used. It's okay,
It goes without saying that similar effects can be obtained from the above embodiments.

〔Effect of the invention〕

As described above, according to the present invention, by providing the cushioning material having vibration absorption characteristics between the magnetic piece and the separator, the vibration of the magnetic piece can be absorbed and the vibration of the separator can be suppressed. This greatly reduces the vibration noise emitted from the deflection yoke, making it possible to maintain quiet operating conditions.

Further, according to the present invention, by injecting and filling at least a part of the gap containing the magnetic pieces generated between the separator and the core with a curable fluid substance such as epoxy resin or silicone resin, the magnetic pieces can be attached to the separator. In addition to being able to completely adhere and fix the separator to the top, the amount of deflection of the separator can be reduced. This suppresses the vibration of the magnetic piece and separator.
This has the effect of reducing vibration noise emitted from the deflection yoke and maintaining quiet operating conditions.

[Brief explanation of drawings]

FIG. 1 is a side view of a deflection yoke showing an embodiment of the present invention;
FIG. 2 is a sectional view showing the structure of the attachment of the magnetic piece of the deflection yoke according to the first embodiment of the present invention, FIG. 3 is a side view of the deflection yoke according to the second embodiment of the present invention, and FIG. 4 (a), (
b) is a diagram showing the mounting position of the magnetic piece in the prior art, No. 5
FIG. 5(a) is a cross-sectional view of the deflection yoke showing the action of the front magnetic piece, FIG. 5(b) is a cross-sectional view of the deflection yoke showing the action of the rear magnetic piece, and FIG. 6(a). (b) is a diagram showing the structure of the magnetic piece attachment according to the prior art, Figure 7 (a) is a diagram showing the horizontal pin magnetic field distribution, and Figure 7 (
b) is a diagram showing the vertical barrel magnetic field distribution, FIG. 8(a). (b) is a diagram showing screen distortion (a screen with little left and right pincushion distortion). 1...Horizontal deflection coil, 2...Vertical deflection coil, 3
... Ferrite core, 4... Separator, 5...
・Rear magnetic piece, 6... Tape, 7... Adhesive material, 8.
・・Front magnetic piece, 10 ・・Bin magnetic field distribution line of magnetic force, 20
Barrel magnetic field distribution lines of magnetic force, 100 Cushioning material, 101 Rear opening, 102 Front opening, 200 Curable fluid material. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A horizontal deflection coil that generates a horizontal deflection magnetic field, a vertical deflection coil that is supported by a ferrite core and generates a vertical deflection magnetic field, a separator that holds the horizontal deflection coil, and a separator that is attached to the surface of the separator. What is claimed is: 1. A deflection yoke for a cathode ray tube, comprising a magnetic piece and a separator, the deflection yoke comprising a cushioning material having vibration absorbing properties between the magnetic piece and the separator. (2) A horizontal deflection coil that generates a horizontal deflection magnetic field, a vertical deflection coil that is supported by a ferrite core and generates a vertical deflection magnetic field, a separator that holds the horizontal deflection coil, and a separator that is attached to the surface of the separator. In a deflection yoke for a cathode ray tube having magnetic pieces, at least a part of the gap containing the magnetic pieces generated between the separator and the core is injected and filled with a curable fluid substance such as epoxy resin or silicone resin. Features a deflection yoke.