KR20000041760A - Magnet assembly for cathode ray tube - Google Patents

Abstract

PURPOSE: A magnet assembly for a cathode ray tube is provided which contributes to improve the image quality of a cathode ray tube by enabling the fine controlling of convergence of red and blue colors. CONSTITUTION: A magnet assembly(28) is made by assembling a dipole(30), four poles part(32,34) and a six pole(36), which is composed of a pair of ring magnets(30a,32a,34a,36a) having a dipole, a four pole and a six pole. At least more than two four poles are arranged, which has a magnetic flux of 80 Gauss and another has a magnetic flux below 80 Gauss. The magnet assembly can improve the productivity by reducing the time required to control the convergence minutely.

Description

Magnet Joiner for Cathode Ray Tubes

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet assembly for cathode ray tubes, and more particularly, to a magnet assembly capable of adjusting not only an electron beam scanned from an electron gun of a cathode ray tube to converge but also an adjustment of a blue and green electron beam.

In general, the cathode ray tube is a red, green, and blue electron beam emitted from the neck of the neck portion is converted into the mask hole of the face panel by the deflection yoke and the magnet combination (hereinafter referred to as CPM) and deflected by the deflection yoke and patterned on the face panel. A predetermined image and an icon are displayed by landing with green and blue phosphors, respectively.

Here, the deflection yoke is mounted on the neck portion of the cathode ray tube and deflects the electron beam scanned from the electron gun up, down, left, and right by a magnetic field of two coils crossing vertically.

In addition, the CPM 2 is a semi-permanent magnet mounted directly to the neck portion 4 of the cathode ray tube or coupled to the yoke portion 6 of the deflection yoke as shown in FIG. By moving the electron beam to match or converge the red, green, and blue electron beams, the purity, convergence characteristics, etc. are adjusted.

As shown in the figure, the CPM 2 is composed of a dipole portion 8, a quadrupole portion 10, and a dipole portion 12 separated by a separation ring 14, and each pole portion 8 and 10. 12 is a pair of ring-shaped magnets 8a, 10a and 12a having a dipole, a quadrupole, and a dipole, and a pair of two magnets 8a (8) of each pole portion 8, 10 and 12 ( By rotating 10a) 12a, the proximity distance between the NS poles is properly adjusted so that the convergence between the electron beams is properly maintained.

The dipole portion 8 is for the purpose of purity control with a magnetization amount of about 110 G (gauss). The red, green, and blue electron beams are moved in the same direction to adjust HRS (Horizontal Raster Shift) or VRS (Vertical Raster Shift). Can be.

The quadrupole part 10 adjusts the convergence between the red and green electron beams, which are the side beams, with a magnetization amount of about 80G, and moves the side beams by the same distance.

Finally, the hexapole portion 12 has a magnetization amount of about 70G and adjusts the convergence between the green electron beam, which is the side beam and the center beam, that is, moves the side beam to collect the center beam.

However, the current convergence process is a situation in which double work is performed by converging all of the red, green, and blue electron beams by using the deflection yoke, and then attempting to move as many electron beams as necessary between the three color electron beams.

The present invention devised to solve this problem is to provide a magnet assembly that can serve not only to adjust the electron beam scanned from the electron gun of the cathode ray tube to converge, but also to adjust the blue and green electron beams.

To this end, the magnet assembly of the present invention has at least two quadrupoles arranged in a structure in which a pair of dipoles, quadrupoles, and hexapoles of a pair of ring-shaped magnets having dipoles, quadrupoles, and hexapoles are combined. One has a magnetization amount of about 80 gauss and the other has a smaller magnetization amount than 80 gauss.

In the case where there are two quadrupoles, the dipole and the dipole may be disposed between the two quadrupoles.

In particular, the quadrupole magnetic portion having a small amount of magnetization among the quadrupole magnetic portions can be arranged between the dipole and the six pole magnetic portions.

At this time, the quadrupole part with small magnetization amount uses about 10-30 gauss.

1 is an exploded perspective view illustrating a magnet assembly according to the present invention mounted on a neck portion of a cathode ray tube;

2 is a view showing the influence of the magnet assembly according to the present invention,

Figure 3 is an exploded perspective view showing the neck portion of a cathode ray tube equipped with a conventionally known magnet assembly.

Explanation of symbols on the main parts of the drawings

20: neck part 24: deflection yoke

26: yoke portion 28: magnet assembly

30, 32, 34, 36: pole part 38: clamp

40: separation ring

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 shows an exploded view of the magnet assembly according to the present invention mounted on the neck portion of the cathode ray tube.

In the drawing, reference numeral 20 denotes the neck portion 20 of the cathode ray tube, and the electron gun 22 is embedded therein so that the red, green, and blue electron beams may be landed on the shadow mask of the face panel, not shown.

Here, a deflection yoke 24 is mounted on the outer periphery of the neck portion 20 for landing of the electron beam. The deflection yoke 24 has two coils vertically arranged with the separator interposed therebetween. By changing the magnetic field, the electron beam is deflected up, down, left and right.

The deflected red, green, and blue electron beams must have purity and convergence to obtain the desired image, but the convergence must be accurately adjusted through ITC work. However, by mounting the CPM according to the present invention to the yoke portion 26 of the deflection yoke, the convergence and the electron beam The correction function can be performed.

CPM 28 according to the present invention is a structure in which a plurality of ring-shaped magnets are arranged, each magnet has a dipole 30a, quadrupole 32a (34a), six depending on how many N and S poles The magnets 30a, 32a, 34a and 36a of the polar poles are paired to form a dipole portion, a first quadrupole portion, a second quadrupole portion, and a hexapole portion.

In the CPM 28, the second quadrupole portion 34, the dipole portion 30, the dipole portion 36, and the first quadrupole portion 32 are sequentially disposed from the side close to the clamp 38. It is divided by the separating ring (40).

In this state, the proximity distance of the N-S poles is appropriately adjusted while rotating the two magnets of each of the pole portions 34, 30, 36, 32 so that the convergence of the electron beam is properly maintained.

Here, the dipole portion 30 is composed of a pair of magnets (30a) having a dipole, so that the magnetization amount is approximately 110G to move the red, green, and blue electron beams in the same direction to exactly the phosphor corresponding to each electron beam. Used to adjust the purity by adjusting to reach.

In addition, the hexapole portion 36 is composed of a pair of magnets 36a having a hexapole, and the magnetization amount is about 70G so that the convergence is adjusted by collecting the red and blue beams, which are the two side beams, and collecting them into the green electron beam which is the center beam. .

The first and second quadrupole portions 32 and 34 have an effect as shown in FIG. 2, and the first quadrupole magnetic pole portion 32 is composed of a pair of magnets 32a having a quadrupole magnetization amount. This is about 80G, which adjusts the convergence between the red and green electron beams, which are side beams, and moves the side beams by the same distance.

In particular, the second quadrupole portion 34 has a smaller magnetization amount than the first quadrupole portion 32 and is used for fine convergence adjustment that is not covered by the first quadrupole portion 32 at about 10 to 30G. The existing convergence adjustment can be replaced by two quadrupoles.

As described above, the embodiment of the present invention substantially solves the conventional problems.

That is, without the convergence of the blue and red electron beams conventionally performed in the deflection yoke of the cathode ray tube, not only the convergence of the three color electron beams but also the correction of the blue and red electron beams can be simultaneously performed using the CPM according to the present invention. Convergence adjustment and correction can be done in a short time.

Therefore, the time required for convergence adjustment and correction can be shortened and productivity can be improved.

Claims (4)

Ring magnets with dipoles, quadrupoles, and hexapoles combine a pair of dipoles, quadrupoles, and hexapoles and attach them to the neck of the cathode ray tube or to the yoke of the deflection yoke. In the magnet assembly for adjusting the electron beam of At least two or more quadrupole portions (32) (34) are arranged, at least one magnetizing amount of about 80 gauss and the other magnetizing amount of the cathode tube, characterized in that less than 80 gauss. 2. The dipole portion 30 and the dipole portion 36 are disposed between the two quadrupole portions 32 and 34 when the quadrupole portions 32 and 34 are two. Magnet assembly for cathode ray tube. 3. The magnet assembly for cathode ray tube according to claim 2, wherein the quadrupole portion (34) having a small amount of magnetization among the quadrupole portions (32) (34) is disposed between the dipole portion and the hexapole portion. 4. The magnet assembly for cathode ray tubes according to claim 3, wherein the quadrupole portion (34) having a small amount of magnetization is about 10 to 30 gauss.