JPH0517907U - Deflection yoke - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a deflection yoke with less noise generated by vibration of a magnetic piece for pincushion distortion correction and a separator to which the magnetic piece is attached. [Configuration] Of the front magnetic piece 8 and the rear magnetic piece 5, at least the rear magnetic piece 5 is embedded in the separator 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deflection yoke mounted on a color cathode ray tube (hereinafter referred to as "CRT").

[0002]

[Prior Art]

 The following two are important functions of the deflection yoke for CRT, especially the deflection yoke of the self-convergence type.

One of them is a convergence function of concentrating three R, G, and B electron beams emitted from an electron gun enclosed in the neck portion of a CRT over the entire screen, and the other one. Is a pinless function that minimizes the pincushion distortion that generally occurs on the left and right of the screen and eliminates the need for horizontal deflection current correction, or minimizes the amount of correction current.

In order to achieve the convergence function of the two important functions as described above, the horizontal deflection magnetic field generally has magnetic field lines 10 having a pin field distribution as shown in FIG. The deflection magnetic field is formed by forming the horizontal deflection coil 1 and the vertical deflection coil 2 so as to generate magnetic field lines 20 having a barrel magnetic field distribution as shown in FIG. 3 is a ferrite core.

However, the vertical deflection magnetic field having the barrel magnetic field distribution acts in a direction to increase the distortion of the left and right pincushion types, and as a result, as shown in FIG. The distortion of Δα remains.

In order to improve this, in general, a vertical deflection magnetic field distribution, a strong barrel magnetic field distribution on the rear side of the deflection yoke close to the electron gun, and a strong pin magnetic field distribution on the front side of the deflection yoke close to the phosphor screen, are generally used. However, it is extremely difficult to form such a magnetic field distribution only by the distribution of coil windings.

FIGS. 4 (a) and 4 (b) show the arrangement of magnetic pieces in a conventional deflection yoke shown in, for example, Japanese Patent Laid-Open No. 62-76140. In FIG. 4, 4 is a separator. The rear magnetic strips 5 having high magnetic permeability are arranged above and below the rear-side portion of the separator 4, and four high-permeability magnetic sheets are provided at diagonal positions at the four corners of the front-side portion of the separator 4. A front magnetic piece 8 is provided.

Next, the operation of the above configuration will be described. On the front side of the deflection yoke, as shown in FIG. 5 (a), the vertical deflection coil 2 and the four front magnetic pieces 8 provide a magnetic field line 10 having a strong pin magnetic field distribution, and a rear side of the deflection yoke. In FIG. 4B, as shown in FIG. 4 (b), the vertical deflection coil 2 and the two rear magnetic pieces 5 can form the magnetic force lines 10 having a strong barrel magnetic field distribution, respectively. It is possible to reduce the pincushion distortion occurring on the left and right of the screen F as shown in FIG.

By the way, in the deflection yoke having the magnetic piece as described above, in particular, the rear magnetic piece 5 which is exposed to the strong vertical deflection magnetic field has a predetermined size of the separator 4 as shown in FIGS. 6 and 7. The protrusion 4a protruding outward from the position and the hole 5a fitted into the protrusion 4a are bonded to the separator 4 with the adhesive 7 in a state of being positioned, and the surface of the rear magnetic piece 5 is attached to the tape 6 It was protected and fixed so as to be covered with.

[0010]

[Problems to be solved by the device]

 In a conventional deflection yoke, a magnetic piece, especially a rear magnetic piece exposed to a vertical deflection magnetic field, is vibrated and erected by the magnetic field, and shakes together with a part of the surface of the separator to which the magnetic piece is adhered, which causes vibration noise. There was a problem that it occurred.

In particular, in recent television receivers that tend to be large-sized, have high image quality, and have high sound quality, the problem of vibration noise leaking from the deflection yoke is serious, and vibration noise of the magnetic piece is reduced. Was strongly requested.

The present invention has been made in order to solve the above-mentioned problems, and greatly reduces the leakage of vibration noise due to the magnetic piece, shortens the installation work time of the magnetic piece, and The purpose is to obtain a deflection yoke that can be mounted with high precision.

[0013]

[Means for Solving the Problems]

 The deflection yoke according to the present invention is characterized in that a magnetic piece arranged in a vertical deflection magnetic field is embedded in a separator.

[0014]

[Action]

 According to this invention, since the magnetic piece disposed in the vertical deflection magnetic field is embedded in the separator, the noise generated due to the vibration of the magnetic piece can be reduced, and the noise leaking from the deflection yoke to the outside can be reduced. Can be significantly reduced.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view of this embodiment. The rear magnetic piece 5 which is arranged above and below the rear side of the surface of the separator 4 to form a magnetic field having a strong barrel magnetic field distribution is shown in FIG. It is embedded and fixed inside.

Next, the operation of the above configuration will be described. Since the magnetic piece 5 is embedded and completely fixed in the separator 4, it is less likely to vibrate, and since vibration noise is blocked by the separator 4, noise leaking to the outside is also reduced.

In the above embodiment, the rear magnetic piece 5 is embedded in the separator 4, but the front magnetic piece 8 of the separator 4 may also be embedded in the separator 4.

[0018]

[Effect of the device]

 As described above, according to the present invention, the magnetic piece that corrects the pincushion-shaped distortion is embedded in the separator and completely fixed, so that the vibration of the magnetic piece can be suppressed. The noise generated due to the vibration of the magnetic piece and the separator holding the magnetic piece can be significantly reduced.

Further, since the work time for attaching the magnetic piece to the separator can be shortened and the attachment position accuracy can be improved, it is possible to obtain a highly accurate and inexpensive deflection yoke.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a sectional view of a deflection yoke showing a horizontal pin magnetic field distribution and a vertical barrel magnetic field distribution.

FIG. 3 is an explanatory diagram showing a situation of distortion on a screen.

FIG. 4 is a side view and a plan view showing an arrangement of magnetic pieces of a conventional deflection yoke.

FIG. 5 is a cross-sectional view of a deflection yoke showing the action of a front magnetic piece and a rear magnetic piece.

FIG. 6 is a plan view showing a mounting structure of a magnetic piece.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 1 horizontal deflection coil 2 vertical deflection coil 3 ferrite core 4 separator 5 rear magnetic piece 6 front magnetic piece

Claims (1)

[Scope of utility model registration request] 1. A deflection yoke for a cathode ray tube comprising a horizontal deflection coil, a separator for holding the horizontal deflection coil, a magnetic piece for forming a magnetic field, a vertical deflection coil, and a ferrite core. A deflection yoke that is embedded in a separator.