JP3497596B2 - Deflection yoke device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device used in a cathode ray tube portion of a color television receiver or the like.

[0002]

2. Description of the Related Art FIG. 4A shows a conventional deflection yoke device. The coil separator 1 is formed of an insulating material and integrally has a large front diameter portion and a small rear diameter portion, and has a flange portion for mounting a substrate or the like on the outer periphery of the small rear diameter portion. A saddle-shaped horizontal deflection coil 2 is arranged inside the coil separator 1, and a toroidal vertical deflection coil 3 is arranged outside.

A coil-shaped box-like (see FIG. 4B) holding, for example, cavities at diametrically opposed positions (upper and lower positions) in the front large diameter portion of the coil separator 1 is provided. The parts 4 are integrally formed, and each holding part 4
A permanent magnet 5 is inserted in the. As the holding portion 4a for holding the permanent magnet 5, there is also a structure as shown in FIG. 4 (C) in which the end portion of the permanent magnet 5 is sandwiched by claws.

The reason for providing the above-mentioned permanent magnet 5 is as follows. In the deflection yoke of the CPT (color picture tube), the permanent magnet described above is used, as shown in FIG.
As shown in (D), upper and lower bow-shaped deflection distortions (shown by dotted lines) are corrected as shown by solid lines. A barium-ferrite system is often used as the material of the permanent magnet, and the shape is designed so that the above-mentioned upper and lower pincushion distortion and the convergence performance are particularly best.

[0005]

However, the upper and lower pincushion distortions and the higher-order distortions associated therewith as described above are corrected due to variations in design perfection of the deflection yoke device, variations in product performance, variations in assembly accuracy, and the like. Is difficult to do.

Therefore, it is an object of the present invention to provide a deflection yoke device capable of more reliably correcting upper and lower pincushion distortions and higher-order distortions related thereto.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a coil separator attached to an outer peripheral portion of a cathode ray tube and a holding portion formed at a radially opposite position on a front side of the coil separator having a large diameter. In the deflection yoke device including the permanent magnets held by the holding portions, a plurality of protrusions are formed by extending from both ends of the holding portion located on the extreme side of the permanent magnet. A deflection yoke device is characterized in that a ferromagnetic body is held by a portion and the ferromagnetic body is projected toward the front side with respect to the permanent magnet.

[0008]

With the above construction, the convergence on the screen, especially the upper and lower pincushion distortion, can be finely corrected by finely adjusting the position of the ferromagnetic material.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of an embodiment of the present invention. That is, according to the present invention, the holding mechanism for the permanent magnets is provided on the front side having the larger diameter of the coil separator at the position opposed to each other in the radial direction. Is shown.

The holding portion 11 is box-shaped, has a cylindrical portion directed in a tangential direction of the front side circumference of the coil separator, and a permanent magnet 12 is inserted therein. Here, the holding part 11 has projections 11a, 11b, 11c, 11d, 11e, 1 and 1 like the main body part extending in the cylinder direction.
1f, 11g, and 11h are formed. Protrusion 11a,
11b, 11c and 11d form a first ferromagnetic material holding portion, and the protrusions 11e, 11f, 11g and 11h form a second ferromagnetic material holding portion. And the first and second
Rectangular plate-shaped ferromagnetic bodies 13a and 13b such as permalloy or silicon steel sheet are attached to the ferromagnetic body holding portions. Protrusions 11a and 11b and 11c and 11d respectively form a gap, and the ferromagnetic body 13a is fitted in this gap. Therefore, the gap is
It is desirable that the thickness is slightly smaller than the thickness of the ferromagnetic body 13 because there is no rattling.

In FIG. 1B, after the deflection yoke device is mounted on the outer periphery of the cathode ray tube 20 near the boundary between the neck portion and the funnel portion, the permanent magnet 12, the ferromagnetic bodies 13a, 1 and 1 described above are mounted.
The state in which 3b and the like are located is shown in a simplified manner. Here, the ferromagnetic body 13a is located in front of and behind the permanent magnet 12.
Direction, that is, the tube axis direction of the cathode-ray tube can be adjusted to move forward and backward, but the larger the protrusion size l from the permanent magnet 12 is, the larger the magnetic field of the permanent magnet 12 can be made to act on the electron beam. The effect of correcting distortion is great.

FIG. 2A is a view of the arrangement state of the permanent magnet 12 and the ferromagnetic bodies 13a and 13b as seen from the front-rear direction. Further, FIG. 2B is a diagram for explaining the deflection distortion and the correction state near the center on the upper side of the screen. The spacing Sa between the permanent magnet 12 and the ferromagnetic body 13a, and the permanent magnet 12
Comparing the distance Sb between the and the ferromagnetic body 13b, Sa> Sb in the example of the figure. Now, without the ferromagnetic bodies 13a and 13b, a pincushion distortion as shown by a dotted line 22 occurs on the screen 21, but when the ferromagnetic bodies 13a and 13b are arranged as shown in FIG. Is corrected to. Here, the ferromagnetic material 13a side is an ideal solid line 24 (virtual horizontal line)
It is due to the above-mentioned effect of Sa> Sb that the ferromagnetic body 13b side is in an insufficient state after being corrected to the position of. Therefore, in this case, if Sb is further reduced, it is possible to approach the ideal horizontal line. this
As shown, the ferromagnetic materials 13a and 13b are horizontal and perpendicular to the tube axis.
The pincushion distortion can be corrected by adjusting the position in the direction.
You can

In order to correct the upper and lower pincushion distortions and the higher-order distortions associated therewith, it is necessary to have a mechanism capable of arbitrarily adjusting the front-rear and left-right positions of the ferromagnetic bodies 13a and 13b. For that purpose, as shown in FIG. A suitable holding mechanism is suitable.

The present invention is not limited to the above embodiments, and various embodiments can be made without departing from the gist of the present invention. For example, as shown in FIG. 3, a plurality of rod-shaped projections 31 are provided on the ferromagnetic material holding portion that is included in the holding portion 11.
a to 31d are formed, and the V-shaped ferromagnetic body 32 is mounted in the gap formed by the protrusions. According to this structure, the magnetic field can be made stronger, the correction effect is improved, and the holding effect of the ferromagnetic material due to the cushioning property can be improved.

In the above description, the configuration of the upper part (upper part of the screen) on the front side of the deflection yoke device has been described.
The lower part has the same structure. It is needless to say that the ferromagnetic material may be arranged on only one side depending on how the upper and lower pincushion distortions occur.

[0016]

As described above, according to the present invention,
Upper and lower pincushion distortions and higher order distortions associated therewith can be more reliably corrected.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a deflection yoke device of the present invention.

FIG. 2 is a functional explanatory view of the deflection yoke device of the present invention.

FIG. 3 is a diagram showing a main part in another embodiment of the deflection yoke device of the present invention.

FIG. 4 is an explanatory view of a conventional deflection yoke device.

[Explanation of symbols]

11 ... Holding part, 11a-11h ... Protrusion, 12 ... Permanent magnet, 13a, 13b ... Ferromagnetic material, 20 ... Cathode ray tube.

Claims (2)

(57) [Claims] 1. A coil separator attached to an outer peripheral portion of a cathode ray tube, a holding portion formed at a position facing each other in a radial direction on a front side having a large diameter of the coil separator, and a holding portion held by the holding portion, respectively. In the deflection yoke device including the permanent magnet, a plurality of protrusions are formed by extending from both ends of the holding portion located on the extreme side of the permanent magnet, and the ferromagnetic body is held by the protrusions. The deflection yoke device is characterized in that the ferromagnetic material is made to project to the front side with respect to the permanent magnet. 2. The ferromagnet is held by the projection so that the position of the ferromagnet can be adjusted in the tube axis direction of the cathode ray tube and in the left-right direction orthogonal to the tube axis. Deflection yoke device.