KR960006527Y1 - Convergence magnetic devices - Google Patents

Abstract

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Description

Convergence magnet assembly for cathode ray tube with added dummy stimulation

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 focused on a mechanical center by ITC adjustment.

3 is a schematic diagram showing a displacement of an electron beam via a magnet ring as a conventional diagram.

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 convergence according to the present invention.

* Explanation of symbols for main parts of the drawings

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

50: Holder

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

A typical 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.

The CPT is coupled to the neck portion of the cathode ray tube (CRT) and three electron guns are installed transversely so that the cathode rays generated from each electron gun appear on the screen as red beams (R), green beams (G), and blue beams (R). do.

In this case, the RGB beam is designed to be emitted from the electron gun and connected to one point of the shadow mask. However, according to the manufacturing process of the CRT and the manufacturing process of the CPT, it is impossible to obtain a uniform product due to various manufacturing errors. Static focusing on a web site is almost impossible

Therefore, a certain amount of connection deviation is inevitably generated, and convergence has been developed and used to adjust the deviation to static convergence at one point.

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 and is operated by a separate power source to generate a magnetic field, and the magnetic field deflects the electron beam and scans the entire screen. In this case, a so-called beam rotation phenomenon occurs in which both side beams (RB beams) bend in an arc shape with respect to the center beam (G beam) due to a manufacturing error of the deflection yoke. Four pole magnet ring is added to correct this.

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 one horizontal axis.

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 RGB beams to the mechanical center, which is the center point of the CRT, displaces the distributed RGB beams (see reference) by the same distance in the same direction. ,

At this time, the G-beam which is the center beam of the three electron beams is adjusted to be located at the mechanical center. (See me)

Afterwards, the RB beams, which are the side beams, are collected using the four poles while maintaining the position of the G beam, which is the center beam. When the RB beam is closely adjusted, the six poles are adjusted to move the RB beam to both sides of the G beam, and when the adjustment is completed, the RGB beams are statically focused at the mechanical center side by side.

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 RB beams (OCV) is 4 poles, and the center point of the linear separation distance between the RB beams and the straight line between the G beams. The separation distance (CCV) is adjusted to 6 poles so that three beams are focused at one point.

However, as described above, the magnet of convergence for statically converging three electron beams at one point is also difficult to manufacture in an ideal state, and thus CPT in the case where there is little focusing error of each beam or there is a minute error (hereinafter, no CPT) In the case of an error tube).

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 upon initial coupling. do.

In this case, in the case of the error-free tube, the electron beam B1 focused at one point on the shadow mask according to the design value should not be affected by the minimum magnetic field of the converged magnet assembly which 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 extracted 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, and in the near term, the difference in the mean magnetic flux density of each magnetic pole in the combination of each magnet ring or the pair of magnet rings N and S This is the difference in the magnetic flux density of the pole.

When the average magnetic flux density of each magnet ring is different, the minimum beam displacement amount (movement amount) is 0.2-0.5mm at the minimum of the composite magnetic field, and the minimum beam displacement amount is still large at 0.1-0.8mm at the maximum of the magnetic field. The problem is that when the combined magnetic field of each pair of magnet rings is maximized, 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 0.2-0.8mm at the minimum of the composite magnetic field, and 0.1-0.8mm at the center beam displacement at the maximum of the composite magnetic field. Again, the minimum beam displacement cannot be ignored, and the center beam is displaced considerably when the combined magnetic field of each pair of magnets is maximized, making the static focusing 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 10-30%, 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, in consideration of the pair ratio, it is necessary to separately magnetize the magnet ring to be used for the inlet side and the magnet to be used for the outlet side, and the inlet and the outlet side must be selectively assembled and assembled in the assembling process. At the same time, this has a problem that it is difficult to identify with the naked eye and sometimes provides a defect factor due to misassembly.

In addition, even in the case of an ideally manufactured convergence magnet assembly using the above-described technique, the amount of beam shift in the absence of magnetic field is necessarily present due to the dispersion of the CPT, the dispersion of the convergence magnet assembly, and the like.

Therefore, when statically focusing three beams of an error-free tube with very small amount of OCV and CCV at one point, the ITC adjustment range is very narrow and the operation is not easy due to the error of OCV and CCV generated in the minimum magnetic field. As described above, the magnetism must be magnetized in consideration of the magnetic field difference, that is, the pair ratio, of the magnetizing stimulus.

The present invention devised in view of the problems of the prior art as described above artificially disperse the focused state of the three beams in the minimum magnetic field state for static focusing in the error-free tube to properly increase the amount of OCV and CCV It is easy to statically focus on three beams by forming additional magnetic poles, and it is also useful for ITC automation and provides convergence for cathode ray tube which can be manufactured without distinguishing magnetization field and magnetization of inlet and outlet of the beam. The purpose is.

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

4 to 5, the pair of magnet poles (10, 20, 30) of P-poles, 4-poles, and 6-poles forming magnetic poles in pairs of two and one to prevent the rotational interference of the magnet rings, respectively. In the convergence in which the spacers 40 interposed between the magnet rings are sequentially inserted into the holders 50 of the nonmagnetic material and fixed,

The formation of separate magnetic poles for increasing the CCV and OCV amounts by inducing displacement of one side beam (R beam, B beam) and the center beam (G beam) among the RGB beams when the magnet ring is in the minimum magnetic field state may include: One side of the spacer 40a may be formed of a resin magnet, and magnetic poles P _N and P _S that may increase the amount of OCV and CCV to one side may be coupled to the holder via the magnet rings. .

On the other hand, the formation of a separate magnetic pole may be configured to additionally insert into the holder by magnetizing the magnetic pole to the magnet ring by providing another magnet ring without forming a magnetic pole in the spacer.

The separately configured magnetic poles may be configured in pairs or as a single body, and may be configured by magnetizing to have a four-pole six-pole complex magnetic field. In addition, the magnet ring forming such a separate magnetic pole may be a deflection yoke ( DY) can also be configured.

Looking at the effect of the present invention to achieve the configuration as described above in more detail as follows.

The convergence for cathode ray tube of the present invention is very useful for ITC work on error-free tubes where the distance difference between each beam, that is, the amount of OCV and CCV is relatively slightly off from the reference value, resulting in the difficulty of static focusing.

That is, as shown in FIG. 5 (a), the error-free tube is in a state in which the RGB thin beams are almost focused (that is, the state of OCV and CCV are extremely small), making ITC adjustment very difficult.

In this case, in the case of convergence combining the separate stimulation of the present invention, the displacement is induced to one side beam (R beam or B beam) and the center beam of the RGB beams as shown in FIG. 5 (b). To artificially increase

As a result, the error-free tube with the increased amount of OCV and CCV is generally a CPT with a large focusing error, so that the coordination of ITC work is increased, thereby facilitating more static concentrating work.

The amount of OCV and CCV will vary depending on the characteristics of the CPT, but there is no problem in practical use if a separate stimulus is formed as a magnetic field that does not affect the characteristics of the CPT and convergence.

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

In order to overcome the difficulty of the ITC work in the error-free tube, the present invention as described above, by dispersing the beam focusing in a separate stimulus and performing a static focus in the dispersed state as compared to the prior art 2 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 has very economical effect, and it is very good to have an advantageous effect on 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 (2)

P-pole, 4-pole, 6-pole three sets of magnet rings (10, 20, 30) that form magnetic poles in pairs to statically focus the electron beam of the CPT, and each magnet ring to block the rotational interference of the magnet rings. In the convergence in which the spacer 40 interposed between the liver is inserted into the holder 50 of the nonmagnetic material and fixed in sequence, When the magnet ring is in the minimum magnetic field, the formation of a separate magnetic pole for inducing the displacement of one side beam (R, B beam) and the center beam (G beam) among the RGB beams to increase the amount of CCV and OCV is performed by the spacer ( One of the spacers 40a is formed of a resin magnetic material, and a magnetic pole (P _N , P _S ) capable of artificially increasing the amount of CCV and OCV to one side is formed between the magnet rings. Magnet assembly. The method of claim 1, And the separate magnetic pole is provided with another magnet ring and forms a magnetic pole in the magnet ring and is further inserted into the holder.