KR19990038862U - Convergence Magnet Assembly for Cathode Ray Tubes - 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 neck portion of an inline cathode ray tube (CRT) for adjusting static focusing. In particular, in the case of adjusting static focusing with each pair of magnets, the CRT 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.

The 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 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, the beam rotation phenomenon in which both side beams (R and B beams) bend in a bow shape with respect to the center beam (G beam) due to manufacturing errors of the deflection yoke. 4 pole magnet ring is added to correct this.

The beam rotation phenomenon caused when the tangent-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 centering of the R, G, and B beams at the mechanical center, which is the center point of the CRT, is distributed R, G, and B beams (see " ga "). To displace by the same distance in the same direction,

At this time, the R and B 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, among the three electron beams (see "C"). When the R and B beams are closely adjusted, adjust the 6 poles so that the R and B beams are moved to both sides of the G beam. When the adjustment is completed, the R, G and B beams are side by side. Static concentration will be achieved 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 focused at 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. Therefore, CRTs in which there is little focusing error of each beam or minute errors are referred to as " In the case of "error-free tubes", rather they cause 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 focused at one point on the shadow mask according to the design value should not be affected by the minimum magnetic field of the convergent 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 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, and in the near term, the difference in the average 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.

The minimum beam displacement amount (movement amount) is 0.2-0.5mm at the synthesized magnetic field that varies the average magnetic flux density of each magnet ring, and the central beam displacement at the synthesized magnetic field is 0.1-0.8mm. When the combined magnetic field of each pair of magnet rings is maximized, there is a problem in that the G beam, which is the center beam, is moved considerably, 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 0.2-0.6mm minimum beam displacement at the minimum of the composite magnetic field and 0.1-0.6mm at the center beam displacement at the maximum of the 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 average 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 made so that the average magnetic flux density is larger than 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 defective 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 CRT, the dispersion of the convergence magnet assembly, and the like.

On the other hand, in order to solve the above problems, the present applicant filed on May 1, 1993 (Korean Utility Model Registration Application No. 93-7214) and filed on July 29, 1996 (Utility Model Notification No. 96-6527). As announced, the dummy poles P _N and P _S magnetized by two poles are added to the spacer, but the side beams R and B are simultaneously in the same direction (up, down, left, right). There is a problem in that it is not easy to statically focus the three beams on the CRT by not being displaced by.

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 researched to fundamentally cure conventional problems as described above, 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 the minimum magnetic field for static focusing on an error-free tube to form a separate six-pole stimulus that increases the amount of CCV. It is an object of the present invention to provide a convergence 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 view 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 via a conventional magnet ring;

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

Figure 5 is a state diagram for explaining the dispersion of the electron beam in the minimum magnetic field state by the convergence 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 FIG. 4 or FIG. 5, three sets of magnet rings 10, 20, and 30 of P-pole, 4-pole, and 6-pole which form magnetic poles in pairs of two and one to prevent the rotational interference of the magnet rings Among the spacers 40 interposed between the magnet rings, in the convergence of the magnets 10, 20, and 30 when the magnet rings 10, 20, and 30 are in the minimum magnetic field, the magnets 10, 20, and 30 are arranged in the holder 50 of the nonmagnetic material. The formation of a separate six-pole pole (P _N , P _S ) that induces one side beam or both side beams to increase the amount of CCV is formed by forming one of the spacers 40a of the spacers 40 by using a resin magnetic material. It is coupled to the holder 50 via the (10, 20, 30).

The direction in which the separate six-pole stimulation (P _N , P _S ) increases the CCV is upper and lower (+ direction increase) (a, b), lower left (-direction increase) (c, d) with respect to the center beam (G). It can be displaced in one direction or in the synthesis direction.

The amount of the additional six-pole stimulation (P _N , P _S ) to increase the CCV is made of + 0.3mm ~ + 1.5mm, -0.3mm ~ -1.5mm.

The separate six-pole poles P _N and P _S are formed at one of the spacer 40 and the spacer 40a.

The cathode ray tube convergence of the present invention is very useful for the ITC work on the error-free tube where the distance difference between each beam, that is, the CCV amount is relatively small 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 the R, G, and B 3 beams are almost focused (a state where the amount of CCV is extremely small) makes ITC adjustment very difficult.

In this case, in the case of convergence combining the separate stimulation 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 ITC work, thereby facilitating the static concentrating work.

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.

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 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 (4)

Nonmagnetic material among three pairs of magnet rings (10,20.30) that form magnetic poles in pairs of two and one, and the spacers 40 interposed between the magnet rings to block the rotational interference of the magnet rings. In the convergence fixed to the holder 50 of the When the magnet rings 10, 20, and 30 are in the minimum magnetic field, a separate six-pole pole (P _N , P _S ) that induces one side beam or both side beams of R, G, and B increases the amount of CCV. The formation of the spacer 40 is one side of the spacer (40a) formed of a resin magnetic material and the coupling between the magnet ring (10, 20, 30) to the holder 50, characterized in that the configuration of the cathode ray tube convergence magnet Assembly. The method of claim 1, The direction in which the separate six-pole stimulation (P _N , P _S ) increases the CCV is upper and lower (+ direction increase) (a, b), lower left (-direction increase) (c, d) with respect to the center beam (G). Convergence magnet assembly for cathode ray tube, characterized in that the displacement in one direction or a synthetic direction. The method of claim 1, Condensation magnet assembly for cathode ray tube, characterized in that the additional 6-pole stimulation (P _N , P _S ) to increase the CCV is + 0.3mm ~ + 1.5mm, -0.3mm ~ -1.5mm. The method of claim 1, The separate six-pole pole (P _N , P _S ) is a magnet assembly for cathode ray tube, characterized in that formed in one of the spacer 40 and the spacer (40a).