JPH0676757A - Convergence device - Google Patents

Abstract

PURPOSE:To provide a small convergence device of high efficiency, for reproducing an accurate color image at a cathode-ray electron tube in which an in-line electron gun is stored. CONSTITUTION:A convergence device has a structure of four sets of magnets for forming a static magnetic field, consisting of a quadrupole magnet 3, a purity magnet 4, a sextipolar magnet 5, and a quadrupole magnet 6. Convergence is adjusted accurately over the entire screen by adjusting the two quadrupole magnetic fields in a state that they are separated from one another at a distance, and by also adjusting special misconvergence of simple pattern, which is formed by the rotation of am electron gun.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence device used in a television receiver such as a high definition display monitor for computers and a high definition receiver.

[0002]

2. Description of the Related Art Generally, in a television receiver of in-line electron gun type, a deflection yoke having a winding distribution changed so that a vertical deflection magnetic field has a barrel shape and a horizontal deflection magnetic field has a pincushion type, is used to converge a peripheral portion of a screen. The correction is performed, and the static magnetic field distribution is given by three sets of six ring-shaped magnets to perform the convergence correction and the color purity (purity) correction at the center of the screen.

FIG. 3 shows an example of static convergence used in a conventional television receiver of the in-line electron gun type, in which a metal band 13 mounted and fixed to the neck portion of a cathode ray tube containing the in-line electron gun is arranged on one side. The cylindrical holder 1 includes a convergence magnet 14 composed of four magnets and a purity magnet 15 composed of two magnets.

[0004]

Usually, in an in-line electron gun type television receiver, the horizontal axis of the deflection center and the arrangement axis of the three electron beams are rotated in the deflection center plane due to beam rotation. A special pattern of misconvergence occurs as shown in FIG. The amount of misconvergence does not pose a practical problem in current TV sets such as NTSC, PAL, and SECAM, but high-definition display monitors for computers and television receivers such as high-definition receivers that require accurate convergence characteristics. In this case, the image quality is deteriorated due to the color shift, and especially in a fine image, the resolution is deteriorated, which is a serious quality problem.

The present invention aims to solve the above-mentioned drawbacks and realizes a convergence device having an additional function.

[0006]

In order to solve the above problems, according to the present invention, two sets of four-pole magnets for performing convergence adjustment among the static magnetic field generating magnets on the outer peripheral surface of the cylindrical holder are provided on the screen side and the socket side. It is arranged such that two 2-pole magnets and two 6-pole magnets are incorporated between them.

[0007]

According to the above construction, in the two sets of four-pole magnets, the additional four-pole magnets on the screen side can be adjusted so that the red and blue beams pass through the horizontal axis of the deflection center of the deflection yoke. In addition, it is possible to realize a high-quality in-line electron gun type cathode electron tube convergence device in which misconvergence is almost completely reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

An embodiment of the present invention has a structure as shown in FIG. That is, several circular arc pieces 2 are provided on the upper portion of a cylindrical holder 1 formed of an elastic synthetic resin to form a cylindrical portion having a diameter smaller than that of the holder 1, and a tightening band fitted into the circular arc piece 2 portion. Thirteen
It is designed to be attached to a cathode ray tube. The holder 1 includes a pair of 4-pole magnets 3, a pair of purity magnets 4, a pair of 6-pole magnets 5, and a pair of 4 magnets.
A spacer 7 is fitted between the pole magnet 6 and each pair of magnets to restrict and hold the positions of these. The four sets of static magnetic field generating magnets have 4-pole magnets on the screen side and the socket side, that is, on both sides, and 2-pole and 6-pole magnets are incorporated between them.

The holder 1 is provided on the inner peripheral edge of the spacer 7.
A plurality of convex portions 9 that fit into the plurality of concave portions 8 and are prevented from rotating, and an elastic convex portion 10 that is in contact with the magnet and has a notch 10 'for giving a rotational torque are formed.

In this structure, eight magnets 3, 4, 5, 6 and three spacers 7 are held between the fixed plate 11 and the plurality of retaining projections 12 provided on the holder 1. When the spacer 7 is inserted into the holder 1, the spacer 7 has a curved shape with the elastic protrusion 10 as a fulcrum, so that a spring effect is produced and an appropriate rotational torque is given to the magnets 3, 4, 5, and 6. .

Usually, in a television receiver of an in-line electron gun type, in order to correct the positional relationship of the three electron guns corresponding to red, green and blue, the red and blue beams are directed in opposite directions with respect to the center green. A 4-pole magnet that moves the same amount in the same direction and a 6-pole magnet that moves the same amount in the same direction are combined. By moving these two sets of magnets, the red and blue beams are adjusted to be superimposed on the green beam on the shadow mask.

Also, the electron beams emitted from the three electron guns of red, green and blue do not hit the phosphors of the corresponding colors, but hit the phosphors of other colors to emit light, resulting in uneven color. It is a two-pole magnet that makes this correction. Two
The pole magnet adjusts the three electron beams by moving them in the same direction and by the same amount.

However, when the electron beam rotates and the deflection horizontal axis and the arrangement axis of the three electron beams rotate on the deflection center plane of the deflection yoke, the conventional two-pole, four-pole, and six-pole magnets alone are used. The misconvergence of special patterns cannot be adjusted.

In the present invention, two sets of two 4-pole magnets 3 and 6 are combined separately on the screen side and the socket side, and the socket-side 4-pole magnet 3 is used to pre-set the screen-side 4-pole magnet 6 as shown in FIG. The red and blue beams are adjusted so that they pass through the horizontal axis of the deflection center plane on the correction surface, and the red and blue beams are turned into green beams on the shadow mask by the screen side 4-pole magnet 6 and 6-pole magnet 5. Adjust to overlap with.

The method of correcting the misconvergence caused by the beam rotation by using the two sets of four-pole magnets 3 and 6 can be applied only to a television receiver such as a high-definition display monitor for computer or a high-definition receiver. No, it is also valid on current TV.

[0017]

As described above, according to the convergence device of the present invention, as shown in FIG. 4, the horizontal axis of the deflection center and the arrangement axis of the three electron beams rotate on the deflection center plane due to the beam rotation. In the in-line electron gun type television receiver that causes a special pattern of misconvergence as shown, the convergence can be accurately adjusted over the entire screen, high quality image can be realized, and it is of great practical value. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a convergence device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the effect of convergence according to the present invention.

FIG. 3 is an exploded perspective view of a conventional convergence device.

FIG. 4 is an explanatory diagram showing basic misconvergence of the inline self-convergence method.

[Explanation of symbols]

 1 Holder 2 Arc Piece 3 4 Poles Magnet 4 Purity Magnet 5 6 Poles Magnet 6 4 Poles Magnet 7 Spacer 8 Wedge Protrusion 9 Recess 10 Elastic Convex 11 Fixing Plate 12 Pullout Protrusion 13 Tightening Band

Claims (1)

[Claims] 1. A cylindrical holder fitted in a neck portion of a cathode ray tube has four poles at both ends of a screen side and a socket side, and two ring-shaped magnets are magnetized to have two poles and six poles between them. Convergence device that combines and arranges one by one.