KR200242233Y1 - Convergence Magnet Assembly for Cathode Ray Tube - Google Patents

Abstract

The present invention facilitates three beams by forming a separate six-pole stimulus to increase the amount of CCV by inducing one side beam or both side beams among R, G, and B when the magnetic field is in the minimum magnetic field for static focusing. It is characterized by providing a convergence magnet assembly for cathode ray tube which is useful for ITC automation and can be manufactured without distinguishing the magnetic field and the inlet and outlet magnet ring of the beam.

Description

Convergence Magnet Assembly for Cathode Ray Tubes

The present invention relates to a magnet assembly installed in the net portion of an inline cathode ray tube (CRT) for adjusting static focusing. In particular, the CRT electron beam has a very small focusing error in controlling static connection with each pair of magnets. The invention relates to a convergence for cathode ray tubes that additionally has a magnetic pole that enables artificial dispersal of the array.

A conventional CRT includes a deflection yoke (DY) and a convergence (PCM) as means for deflecting and adjusting an electron beam by coupling an electron gun to an exhausted glass tube as shown in FIG.

In the CRT, three electron guns are installed laterally so that the cathode ray generated from each electron gun is displayed on the screen as a red beam (R), a green beam (G), and a blue beam (B).

At this time, the R, G, B beams are designed to be emitted from the electron gun and focused on one point of the shadow mask, but in reality, the CRT manufacturing process cannot obtain a uniform product due to various manufacturing errors. It is almost impossible to do so.

Therefore, a certain amount of focusing deviation is inevitably generated, and convergence has been developed and used to adjust the deviation to focus on one point statically.

The convergence includes a pair of magnetized magnets magnetized into P-poles, 4-poles, and 6-poles, and this conventional convergence causes the electron beam emitted by Fleming's left-hand law and Lorentz force to be displaced.

On the other hand, the deflection yoke (DY) is composed of a ferrite core, a pair of vertical deflection coils and a pair of horizontal deflection coils, which are operated by a separate power source to generate a magnetic field, and the magnetic field deflects the electron beam to the entire screen. Scanned raster is formed, which is also called beam rotation in which both side beams (R, B beam) are curved in a shape of the center beam (G beam) due to a manufacturing error of the deflection yoke. Phenomenon occurs, and a 4-pole magnet ring is added to correct it.

The beam rotation phenomenon caused when the statically focused beams are formed as a raster over the entire screen is positioned as a four-pole magnetized magnet ring and corrected on a horizontal one axis line.

The deflection yoke and the convergence may be made as one body or may be separately configured and used.

As shown in FIG. 2, the magnetization magnetized to the P-pole in the static focusing of the R, G, and B beams in the central mechanical center of the CRT is distributed R, G, and B beams (see "ga"). Are displaced by the same distance in the same direction (see “b”), and the R and B beams, which are side beams, are collected using four poles while maintaining the position of the G beam, which is the center beam, among the three electron beams. Bar (refer to "C") The four poles cause the R and B beams, which are side beams, to be displaced by the same distance in opposite directions. Adjust the 6 poles as much as possible, and when this adjustment is completed, the R, G, and B beams will be statically focused at the mechanical center (see "D").

At this time, the work process is called ITC work. In this case, in the static focusing using 4 poles and 6 poles, the linear separation distance between the R and B beams (OCV) is 4 poles. The linear separation distance (called CCV) between the G beams is adjusted to 6 poles so that the three beams are connected to one point.

However, as described above, the magnet of convergence for static converging three electron beams at one point is also difficult to manufacture in an ideal state, and thus, CRTs having little or no focusing error of each beam or having a small error (hereinafter, referred to as "error-free" In the case of a tube ", rather it causes dysfunction.

That is, as shown in FIG. 3, the pair of magnet rings are formed so that the N pole and the S pole may face each other so as to form a minimum magnetic field that is a canceled state of the magnetic field in order to minimize the displacement amount of each beam during the initial coupling. .

In this case, in the case of an error-free tube, the electron beam B1, which is focused on one point on the shadow mask as designed, should not be affected by the minimum magnetic field of the converged magnet assembly that is ideally manufactured (ie, the beam should not move). This is facilitated.

However, in the case of a convergent magnet assembly which is not ideally manufactured, the electron beam B1 is displaced like the electron beam B2 (i.e., the beam moves) and thus causes considerable difficulty in adjustment.

Therefore, convergence magnet assemblies in such error free tubes require a technique for minimizing the amount of electron beam shift at the minimum magnetic field.

Conventionally, various types of technologies have been developed and drawn to manufacture a converged magnet assembly requiring such characteristics.

In other words, the focus has been on reducing the deviation between the north pole and the south pole of each magnet ring. In the near term, the combination of the magnet rings has a difference in the mean magnetic flux density of each magnetic pole or a pair of magnet rings in the N pole and the S pole. The difference in magnetic flux density is

The minimum beam displacement amount (movement amount) is 0.2-0.5mm at the combined magnetic field, which is different from the average magnetic flux density of each magnet ring, and the central beam displacement amount at 0.1-0.8mm is still large, and the minimum beam displacement is still large. When the combined magnetic field of each pair of magnet rings is maximized, there is a problem that the G beam, which is the center beam, is moved a considerable amount, making adjustment difficult.

In addition, the difference in the magnetic flux density of the N pole and the S pole in the single magnet ring is the minimum beam displacement of 0.2 ~ 0.6mm at the minimum of the composite magnetic field, the center beam displacement of 0.1 ~ 0.6mm at the maximum of the composite magnetic field. The minimum beam displacement is not negligible, and when the composite magnetic field of each pair of magnets is maximized, the center beam is displaced considerably, making the static focusing composition even more difficult.

On the other hand, according to the conventional technique, the difference in the mean magnetic flux density of each pair of magnet rings, that is, a pair rate of about 10 to 30%, is applied to the inlet side magnet ring and the outlet side magnet ring of the beam and the inlet side The magnet ring is formed so that the average magnetic flux density is larger than that of the outlet magnet ring. In this case, it is troublesome to manufacture the magnet ring to be used on the inlet side and the magnet ring to be used on the outlet side separately in consideration of the pair ratio. In the assembling process, there is a problem in that the inlet and the outlet side must be selectively assembled, and at the same time, it is difficult to identify with the naked eye, which sometimes leads to a problem of poor quality due to misassembly.

In addition, even if the converged magnet assembly is ideally manufactured using the above-described technique, the beam drift in the absence of magnetism will necessarily exist due to the dispersion of the CRT, the dispersion of the convergence magnet assembly, and the like.

On the other hand, the present applicant filed on May 1, 1993 (Korean Utility Model Registration Application No. 93-7214) to solve the problems described above, and filed December 10, 1994 (Utility Model Publication No. 94-27562) ), Followed by the addition of a dummy pole (P _N , P _S ) magnetized in two poles to the spacer, as published July 29, 1996 (Utility Model Notification No. 96-6527). In addition, the side beams (R beams, B beams) are not easily displaced in the same direction (up, down, left, right) at the same time, thereby making it difficult to statically focus three beams on the CRT.

Therefore, when statically focusing three beams of an error-free tube with a very small amount of CCV at one point, the ITC adjustment range is very narrow and the operation is not easy due to the CCV error generated in the minimum magnetic field. It is a situation where extremely complex technology is used in terms of construction, manufacturing, and assembly since it must be magnetized in consideration of a magnetic field vehicle, that is, a pair ratio.

The present invention has been devised to fundamentally cure the above-mentioned conventional problems, and has the following objectives.

The present invention induces one side beam or two side beams of R, G, and B when the magnetic field is in a minimum magnetic field for static focusing on an error-free tube to form a separate six-pole magnetic pole that increases the amount of CCV. It is an object of the present invention to provide a convergent magnet assembly for cathode ray tubes that can be easily static focused and useful for ITC automation, and can be manufactured without distinguishing the magnetization field and the inlet and outlet magnet rings of the beam.

1 is a schematic diagram showing the configuration of a typical cathode ray tube.

2 is a conceptual diagram showing a state in which an electron beam is connected to a mechanical center by ITC adjustment.

3 is a schematic diagram showing displacement of an electron beam in the case of a conventional magnet ring.

Figure 4 is a side view showing the convergence according to the present invention.

5 is a state diagram for explaining the degree of dispersion of the electron beam in the minimum magnetic field state by the cover voltage according to the present invention.

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

10,20,30: Magnet ring 40,40a: Spacer

50: holder P _N , P _S : separate stimulus

OCV: straight separation distance between R and B beams

CCV: Linear separation distance between center point of G and R beams

CRT: Cathode Ray Tube PCM: Convergence

DY: deflection yoke

Hereinafter, with reference to the accompanying drawings the technical configuration of the present invention made to embody the above object.

As shown in Figs. 4 and 5, three pairs of magnet rings (10, 20, 30) of P-pole, 4-pole, and 6-pole forming magnetic poles in pairs of two and one pair are blocked. The spacers 40 interposed between the magnet rings so as to be sequentially fixed to the holder 50 of the nonmagnetic material, and when the magnet rings 10, 20, 30 are in the minimum magnetic field, R, G, B beams Separate magnetic poles (P _N , P _S ) to increase the amount of CCV by inducing to form one spacer (40a) of the spacer 40 of the resin magnet to interpose between the magnet ring (10, 20, 30) In the converging magnet assembly configured to be coupled to the holder 50, the separate magnetic poles P _N and P _S are formed in six poles to guide both side beams of the R, G, and B beams in the same direction at the same time. However, the direction in which the separate six-pole magnetic poles P _N and P _S increase the CCV is based on the center beam G. At least one or two of the R and B beams increases by +0.3 mm to +1.5 mm in the up direction (+ direction) (a, b) or -0.3 in the down direction (-direction) (c, d). It can be shifted in one direction or in the synthetic direction by increasing mm ~ -1.5mm.

The separate six-pole magnetic poles P _N and P _S may be formed at any one of the spacer 40 and the spacer 40a.

The convergence for cathode ray tube of the present invention is very useful for the ITC work on the error free tube that the distance difference between each beam, that is, the CCV amount is relatively small away from the reference value, causes the difficulty of static focusing.

That is, as shown in FIG. 5, the error-free tube is in a state in which R, G, and B 3 beams are almost focused (a state in which the amount of CCV is extremely small), which makes ITC adjustment very difficult.

In this case, in the case of convergence combining the separate magnetic poles of the present invention, the amount of CCV is artificially increased by inducing one side beam or both side beams of the R, G, and B beams to be displaced.

As a result, the error-free tube with the increased amount of CCV is generally a CRT with a large focusing error, so that the adjustment range is increased during the ITC operation, thereby facilitating the static concentrating operation.

Here, the CCV amount varies depending on the characteristics of the CRT, but the magnetic field does not affect the characteristics of the CRT (color picture tube) and convergence.

In addition, the present invention can significantly reduce the error of automation equipment and measurement by automatically adjusting with increased CCV amount in case of automating ITC work in the future, and the servo mechanism that rotates the magnet ring can be configured at low cost. This is useful for automation.

As described above, in order to overcome the difficulty of ITC work in the error-free tube, the present invention distributes the focus of the beam with a separate stimulus and performs the static focus in the dispersed state. It does not require complicated technical configuration such as magnetization of the middle magnetic field, and it is easy to work due to the large range of ITC coordination, while its structure is simple and very economical, and it has a very good effect for future ITC automation. It is

Finally, the present invention can be implemented in the deflection yoke (DY) and convergence (PCM), respectively, and of course, even if the convergence (PCM) is integrally configured to the rear end of the deflection yoke (DY) of the present invention The technical idea is the same.

Claims (1)

Three pairs of magnet rings (10, 20, 30) of P-pole, 4-pole, and 6-pole forming magnetic poles in pairs of two, and the spacers 40 interposed between the magnet rings to block the rotational interference of the magnet rings. A separate stimulus is inserted into and fixed to the holder 50 of the nonmagnetic material, and induces R, G, and B beams to increase the CCV amount when the magnet rings 10, 20, and 30 are in the minimum magnetic field state. Convergence magnet P _N , P _S to form one spacer (40a) of the spacer 40 made of a resin magnetic material to be coupled to the holder 50 via the magnet rings (10, 20, 30) In the assembly, the separate magnetic poles (P _N , P _S ) to form a six-pole to make both side beams of the R, G, B beams in the same direction at the same time, the separate six-pole magnetic poles (P _N , P _S) the direction of expanding the CCV is the basis of the center beam (G) R, B bimjung at least one beam or two Beam increases by +0.3 mm to +1.5 mm in the upward direction (+ direction) (a, b) or -0.3 mm to 1.5 mm in downward direction (-direction) (c, d). A convergence magnet assembly for cathode ray tubes, which can be displaced.