KR100389544B1 - Magnet corporation for cathode ray tube - Google Patents

Abstract

The present invention relates to a magnet assembly for cathode ray tube, which improves magnetism structure (CPM) adjustment workability during ITC manufacturing process and at the same time maximizes the quality of cathode ray tube related to color purity by reducing adjustment distribution and defects. It's about a magnet to make it work.

The magnet assembly of the present invention for achieving this, the angle formed by a straight line and the handle central axis (θ3 connected by connecting the two points of the maximum magnetization in the magnet ring of the pair of magnet ring constituting each pole through the center of the ring (θ3) ), And the difference (θ5) between the straight line connecting the two points of the magnetization maximum in the other magnet ring via the center of the ring and the handle central axis (θ5) is 5 ° or more. It is characterized by.

Description

MAGNET CORPORATION FOR CATHODE RAY TUBE}

The present invention relates to a cathode ray tube, and more particularly, because the magnetized positions of the magnet pairs mounted to adjust the path of the electron beam radiated from the electron gun are different from each other based on the magnet handle. The present invention relates to a magnet structure for maintaining good workability during ITC work, even for a cathode ray tube having a large or large OCV or CCV amount.

First, a configuration of a general color cathode ray tube will be described with reference to FIG. 1.

A common color cathode ray tube is a panel 2 which is a front glass having a flat or specific curvature on the outer surface and an inner surface thereof, and a funnel 3 which is a conical shape and a rear glass which is sealed by frit glass to the panel 2. Form a tube. The neck portion 4 of the funnel 3 is equipped with an electron gun 6 for emitting the electron beam 5, and a shadow mask having a color discrimination function in a tube formed of the panel 2 and the funnel 3. 8) is installed to maintain a certain distance from the inner surface of the panel. The frame 9 is used to support the shadow mask 8 and the shadow mask 8 and the frame 9 are usually joined by welding. In addition, the inner shield 12 made of a magnetic material is coupled to the frame 9 by the fixing spring 14 to reduce the movement of the electron beam by an external magnetic field, and the electron beam 5 emitted from the electron gun 6 is separated from the panel ( 2) A deflection yoke 13 for deflecting the electron beam 5 is mounted on the neck portion 4 so as to be emitted to the entire surface of the fluorescent surface 7 formed on the inner surface.

In addition, a magnet structure (CPM) 1 for directly adjusting the red, green and blue electron beams so that the electron beam 5 emitted from the electron gun 6 converges at one point is directly mounted on the neck portion 4 or the yoke portion of the deflection yoke. Coupled to (13) to form a forced magnetic field. A typical CPM (Convergence Purity Magnet) is shown in FIG. 2.

That is, the CPM 1 is typically collected by dividing the dipole portion 21, the quadrupole portion 22, and the six-pole portion 23 into ring spacers 24a, 24b, and 24c. The magnetic part is a pair of two magnets (201, 202) of the ring-shaped magnet having a dipole, a quadrupole, and a six-pole, and by adjusting the proximity distance of the NS pole while rotating the two magnets of each pole portion as shown in Figure 3 Change the strength and path of the magnetic field. At this time, the intensity and path of the magnetic field affect the electron beam 5 so that the path of the electron beam 5 can be adjusted, and ultimately, the convergence of the electron beam is properly maintained.

Unlike the conventional CPM described herein, there may be a CPM to which only 4-pole and 6-pole are applied without dipoles according to the purpose, and the order in which they are collected may be arranged differently.

In addition, a holder 26 to which each magnet is coupled is mounted to surround the neck portion 4, and the holder 26 is wrapped by the band 25 so that it can be properly tightened by the bolt. Also, a locker 27 is provided to hold a plurality of magnets constituting the CPM.

The dipole portion 21 is for adjusting the purity, and may move both red, green, and blue electron beams in the same direction to adjust the horizontal raster shift (HRS) or the vertical raster shift (VRS). The quadrupole part 22 adjusts the convergence between the red and green electron beams, which are the side beams, and moves the side beams by the same distance. Finally, the six-pole portion 23 adjusts the convergence between the side beam and the green electron beam, which is the center beam, that is, moves the side beams and collects them into the center beams.

Figure 4 shows a magnet configuration according to the prior art. As shown, the pair of CPM magnets (socket-side magnet ring 201 + screen-side magnet ring 202) are approximately in the same position with respect to the central axis of the knobs Knob 201a and 202a respectively formed to rotate the magnet ring. Magnetized by magnetizing and forming the opposite polarity only. That is, the angle formed by a straight line connecting the center point of the handle in the magnet ring and the ring with the maximum amount of magnetization in one ring and the center of the ring is θ1, and the center axis and ring of the handle in the other magnet ring. When the angle formed by a straight line connecting the center of the ring and the two points where the maximum amount of magnetization is maximum is θ2, the difference between θ1 and θ2 is generally within 5 °.

In such a configuration, when the handles of the two magnet rings are put together side by side, magnetic forces are completely canceled with each other so that the electron beam is not affected.

In order to combine these two magnet rings and mount them in the cathode ray tube and converge the red and blue side beams, the angles formed by appropriately rotating the two handles are expressed as θ in FIG. 4.

When the distance between the two electron beams (OCV; Outer Convergence Variance) becomes large due to the characteristics of the cathode ray tube, a strong forcing magnetic field is required, and the opening angle θ of the two handles 201a and 202a is increased. When the angle of opening of the two handles increases beyond a certain level, the workability is degraded during the work of I.T. (Integral Tube Component), which is a task to adjust the electron beam path. Thrown away.

In addition, a problem of deterioration of the quality of the cathode ray tube may occur because color purity is degraded because the electron beam is not accurately landed on the corresponding phosphor.

The present invention has been proposed to solve the above problems in the prior art, and adjusts the electron beam path by maintaining the rotation angle of the magnet even if the distance between the electron beams is increased or the raster movement is increased. The purpose is to improve workability during work.

The above object is, the angle (θ3) between the two points of the magnetization of the magnet ring of the plurality of magnet ring constituting the magnet assembly and the straight line connecting the center of the ring and the center of the handle and the other magnet ring It is possible to achieve by providing a difference (θ5) of the angle (θ4) formed by a straight line connecting the center of the ring and the two points and the maximum magnetizing amount at 5 ° or more.

Through the achievement of the above object it is possible to improve the ITC workability can prevent the color purity of the cathode ray tube.

1 is a configuration diagram of a typical cathode ray tube.

2 is a structural diagram of a CPM for a cathode ray tube.

Figure 3 shows the operating state by the magnetic force of each magnet in the CPM,

3A shows a dipole portion

3B shows a quadrupole portion

3C is a six-pole portion

4 is a block diagram of a quadrupole magnet according to the prior art.

5 is a block diagram of a quadrupole magnet according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: magnet structure 2: panel

3: funnel 4: neck part

5: electron beam 301, 302: 4-pole magnet ring

Hereinafter, a specific embodiment of the present invention will be described with reference to the quadrupole magnet ring of FIG. 5.

In the present embodiment, a pair of four-pole magnets will be described as an example. In one magnet ring (socket-side magnet ring; 301) among pairs of magnet rings, the central axis of the handle 301a and the ring The angle formed by the straight line connecting the two points with the maximum magnetization amount through the center of the ring is called θ3. In the other magnet ring (screen side magnet ring) 302, the center axis of the handle 302a and the ring When the angle between the two points where the maximum amount of magnetization is maximized and the straight line connecting the center of the ring is θ4, the difference between θ3 and θ4 is 5 ° or more.

By changing the angle as described above, even if the handles are gathered side by side as in the prior art, the magnetic fields of the two magnet rings 301 and 302 are not canceled out.

When the magnet pairs 301 and 302 of the present embodiment are mounted on the cathode ray tube to converge the red and blue electron beams, the two magnet knobs 301 a and 302 a are slightly reduced even if the distance (OCV) between the two side electron beams is large due to the characteristics of the cathode ray tube. Since it can be converged to one point even by rotating, the ITC work becomes easier, and the electron beam path can be precisely adjusted so that it can be accurately landed on the phosphor corresponding to the electron beam, thereby realizing a cathode ray tube of excellent image quality.

In FIG. 5, the angles between the handles 301a and 302a of the present embodiment are expressed as θ 5, and when applied to a cathode ray tube having the same amount of OCV, the present invention is compared with θ in FIG. 4. It can be seen that θ5 is relatively small.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the magnet structure of the present invention may be variously modified and implemented by those skilled in the art.

For example, the above-described embodiment of the present invention has described the 4-pole as an example, which is not only applicable to the 4-pole but also the dipole or 6 as in the case of a tube having a large amount of Raster Shift or a large amount of Center Convergence Variance (CCV). The same can be said of the ultimatons.

In addition, the method of applying this may be implemented by changing the position of the magnetization in the existing CPM manufacturing equipment, in some cases may be implemented by changing the position of the handle of the magnet ring while leaving the position of the magnetization as it is. .

Therefore, such modified applications should not be individually understood from the technical spirit or the prospect of the present invention, and other modified embodiments should fall within the appended claims of the present invention.

As described above, the magnet of the present invention provides excellent CPM workability and low misalignment of CPM even in the manufacturing process of cathode ray tube with large OCV, CCV, Raster Shift, etc. It can be seen that the image quality can be improved by increasing the color purity of the tube.

Claims (4)

A panel coated with a fluorescent surface for image realization on an inner surface thereof, a funnel having a neck portion at a rear end thereof coupled to the rear of the panel to maintain an interior in a vacuum state and to which an electron gun is to be mounted, a deflection yoke coupled to the funnel, and In a cathode ray tube including a magnet assembly composed of a ring-shaped pair for adjusting convergence of red, green, and blue 3 electron beams by being fastened to the rear end of the deflection yoke to form a forced magnetic field: The magnet assembly has an angle (θ3) formed by a straight line connecting the two points of the magnetization of one magnet ring of the magnet ring pairs through the center of the ring and the handle central axis, and the amount of magnetization in the other magnet ring. The magnet assembly for cathode ray tube, characterized in that the difference (θ5) of the angle (θ4) formed by the straight line connecting the two points to the maximum via the center of the ring and the handle central axis (5) is 5 ° or more. The method according to claim 1, The pair of magnets form a dipole, where θ5 is 5 ° ≦ | θ3 − θ4 | Magnet assembly for cathode ray tube, characterized in that provided to satisfy the range of ≤180 °. The method according to claim 1, The magnet pairs form quadrupoles, and θ5 is 5 ° ≦ | θ3 − θ4 | Magnet assembly for cathode ray tube, characterized in that provided to satisfy the range of ≤90 °. The method according to claim 1, The pair of magnets form a six-pole, θ5 is 5 ° ≤ | θ3-θ4 | Magnet assembly for cathode ray tube, characterized in that provided to satisfy the range of ≤ 60 °.