JPS645818Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a deflection device applied to a deflection device of an in-line three-beam color cathode ray tube.

"Background technology and its problems" In order to realize a deflection device that is free from left and right pin distortion in a vertical toroidal and horizontal hollow-shaped deflection device, the vertical deflection magnetic field must be a pin magnetic field on the phosphor screen side and a barrel magnetic field on the electron gun side. It is well known that When the deflection magnetic field is given a front-back distribution in this way, the three electron beams are twisted, and the vertical misconception at the corners of the screen is no longer correct.

Various methods have been considered as countermeasures against this problem.
An example of this is the configuration shown in FIG.
In FIG. 1A, reference numeral 1 indicates a separator made of synthetic resin, and a horizontal deflection coil 2 formed in a hollow shape is provided inside the separator 1, and a toroidally wound vertical deflection coil 2 is provided on the outer surface of the separator 1. A deflection coil 4 is provided. FIG. 1A shows only one half of the longitudinal section of the deflection device. The cross section of this deflection device is shown in FIG. 1B.

At the rear of the vertical deflection coil 4 of this deflection device on the electron gun side, magnetic pieces 5A, 5B, 6A, and 6B are provided on the top and bottom, left and right sides, respectively, as shown in FIGS. 1C and 1D. . In FIG. 1C and FIG. 1D, illustration of the horizontal deflection coil 2 and the vertical deflection coil 4 is omitted for the sake of simplicity. The upper and lower magnetic pieces 5A and 5B form a barrel-shaped vertical deflection magnetic field on the electron gun side. Left and right magnetic pieces 6A, 6
B is for shunting the vertical deflection magnetic field so that it does not extend backward.

In the conventional configuration shown in FIG. 1, the number of parts is large, and the positional relationship between the magnetic pieces 5A, 5B, 6A, and 6B, and the horizontal deflection coil 2 or vertical deflection coil of the magnetic pieces 5A, 5B, 6A, and 6B. The positional relationship with respect to 4 had a large effect on convergence, and installation and adjustment were troublesome.

Therefore, as shown in FIGS. 2A and 2B, a compensating magnetic body 7 of an integrated structure having a shape corresponding to half of the left and right magnetic pieces and an upper (or lower) magnetic piece has been proposed. . The correction magnetic body 7 is formed by cutting out and pressing a soft ferromagnetic material, such as a silicon steel plate. This integrated correction magnetic body 7 is
It is possible to reduce the number of parts and improve mechanical precision.

However, since silicon steel plates are low-resistance materials, eddy currents flow when a horizontal deflection magnetic field passes through them, and the magnetic field caused by these eddy currents shifts the electron beam in the lateral direction, causing asymmetric misconvergence. In order to manufacture the correction magnetic body 7 having the shape shown in FIG. 2 using high-resistance ferrite, a mold for shaping and sintering is required, and polishing is required to achieve dimensional accuracy. This results in an increase in costs.

``Purpose of the invention'' The purpose of this invention is to provide a deflection device equipped with a correction magnetic body that has a simple structure, is easy to install, and is not adversely affected by the magnetic field caused by eddy current. .

``Summary of the invention'' This invention consists of providing high-resistance magnetic pieces extending in the tube axis direction at upper and lower positions on the electron gun side of the deflection device of a color cathode ray tube. Arc-shaped metal ferromagnetic plates are arranged across different positions.

"Embodiment" An embodiment of this invention will be described below with reference to the drawings. First, the magnetic material for correction in this embodiment will be explained with reference to FIG.

As shown in FIGS. 3A and 3D, the magnetic material for correction is composed of a magnetic plate 8 made of a metal magnetic material such as silicon steel and a magnetic plate 9 made of a high resistance magnetic material such as ferrite. There is. The magnetic plate 8 is located above (or below) the color cathode ray tube, as shown in FIG. It has circular arc-shaped clamping parts 11A and 11B extending from the center, and is bent into a half-ring shape as a whole. Further, as shown in FIG. 3D, the magnetic piece 9 is curved so that the width direction follows the outer peripheral surface of the separator 1 of the deflection device, and the rear end 1
It is molded to curve from 2A toward the front end 12B.

Then, as shown in FIGS. 3A and 3B, the rear end portion 12A of the magnetic piece 9 is fitted into the connecting portion 10 of the magnetic plate 8. As shown in FIG. 4, the magnetic plates 8 and 9 in the upper fitted state are provided in the upper and lower halves of the separator 1, respectively.
Further, the position where this magnetic piece 9 is provided is the position on the electron gun side of the vertical deflection coil of the deflection device, similar to the magnetic pieces 5A and 5B in FIG.

In one embodiment of this invention, the vertical deflection magnetic field becomes barrel-shaped on the electron gun side due to the magnetic pieces 9 located on the upper and lower sides, so that Y-bow misconvergence can be corrected. In addition, the vertical deflection magnetic field is shunted by the clamping parts 11A and 11B of the magnetic plate 8 located on the left and right sides, preventing the vertical deflection magnetic field from going around to the electron gun side, and preventing misconvergence from occurring at the corner portions. Prevented.

Furthermore, considering the influence of the horizontal deflection magnetic field, since the magnetic piece 9 has a high resistance, it is possible to prevent the generation of eddy currents due to the horizontal deflection magnetic field. On the other hand, eddy current is generated in the magnetic plate 8 due to the horizontal deflection magnetic field. However, the magnetic field generated by this eddy current is shielded by the magnetic piece 9 and does not affect the electron beam.

Further, as shown in FIG. 5, as the magnetic plate 8,
The connecting portion 10 may have a simple arc shape, and the clamping portions 11A and 11B may extend vertically from both sides of the connecting portion 10.

``Effect of the invention'' According to this invention, it is possible to install the metal magnetic plate and the high-resistance magnetic piece in a fitted state, so it is possible to easily meet the specified specifications without using parts such as attachments. A correction magnetic body can be placed at the position. In addition, with this invention, eddy currents are generated by the horizontal deflection magnetic field, and the adverse effects of the magnetic field due to this can be prevented, and the occurrence of asymmetric misconvergence can be suppressed. Furthermore, the shape of the high-resistance magnetic piece is relatively simple, and even if ferrite or the like is used, the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view, a cross-sectional view, and a top view used to explain an example of a conventional deflection device, FIG. 2 is a perspective view and a top view used to explain another example of a conventional deflection device, and FIG. 4 is a side view, a rear view, and a partial perspective view used to explain the correction magnetic body in an embodiment of this invention, and FIG. 4 is a cross-sectional view of an embodiment of this invention.
FIG. 5 is a rear view of another example of this invention. 1...Separator, 2...Horizontal deflection coil, 4
... Vertical deflection coil, 8 ... Magnetic plate, 9 ... Magnetic piece.

Claims (1)

[Scope of utility model registration request] At the position on the electron gun side of the color cathode ray tube's deflection device, high-resistance ferromagnetic pieces extending in the tube axis direction are installed at the upper and lower positions, and an arc-shaped metal piece is placed across the ferromagnetic pieces at the position on the electron gun side. A deflection device characterized by arranging a ferromagnetic plate.