KR100319091B1 - How to adjust the purity and convergence of cathode ray tube - Google Patents

Abstract

The present invention discloses a method for adjusting the purity and convergence of a cathode ray tube. According to the cathode ray tube purity and convergence adjusting method according to the present invention, a magnetic pole is formed opposite to each other, and a donut-type ferromagnetic magnet and a weak magnetic magnet are placed side by side to form a 4-pole magnet, and the 4-pole magnet In the neck of the cathode ray tube, first adjust the purity based on the G-beam, and then move either one of the donut-type ferromagnetic magnet and the weak magnetic magnet to form the 4-pole magnet. The convergence is adjusted by moving any one of them, and the other one of the ferromagnetic magnet and the weak magnetic magnet forming the 4-pole magnet is moved to adjust the convergence by moving the other of the B beam and the R beam. Therefore, in the method of adjusting the purity and convergence of the cathode ray tube using the six-pole magnet, the use of the six-pole magnet can be omitted, thereby making it possible to make the adjustment operation simpler and easier and to increase the productivity.

Description

How to adjust the purity and convergence of cathode ray tube

The present invention relates to a method for adjusting the purity and convergence of a cathode ray tube, and more particularly, to a method for adjusting the purity and convergence of a cathode ray tube using a 4-pole magnet.

In general, a color cathode ray tube used as a display device such as a color television receiver or a color monitor performs convergence adjustment to faithfully reproduce the color of the displayed image. That is, red, green, and blue electron beams emitted from three primary color electron beams, that is, three electron guns (three beams), respectively, for the entire area of the screen on which an image is displayed. The three-color electron beams (hereinafter referred to as R, G, and B beams) need to be incident at different incidence angles so as to be concentrated by connecting to one point on the shadow mask surface. That is, the three-color electron beam is simultaneously deflected in the deflection field and scanned to every corner of the screen, where the three-electron beam must be concentrated at one point at any place on the shadow mask surface. Thus, the concentration of three electron beams should be regarded as a prerequisite, but in reality, instead of focusing on them, an external magnetic field is applied to adjust the trajectories of the electron beams, which is called convergence adjustment.

In addition, a phenomenon in which some or all of the beams from the electron gun do not collide with the required stripe correctly and collides with another stripe next to the stripe is called mislanding. When the 3 electron beam irradiates only the corresponding fluorescence point by the correct landing, Purity improves. At this time, purity of emission color is called Purity. Originally, Purity is corrected by correlation of electron gun, shadow mask hole, and fluorescence point in structure of cathode ray tube, but beam deflection and mask deflection due to external material such as electron gun eccentricity and geomagnetic Mislanding occurs due to deformation, etc., resulting in poor purity.

The above-mentioned adjustment of purity and convergence is performed by fixing deflection yokes and magnets to the cathode ray tube in a process called ITC (Integrated Tube Components) adjustment in the manufacture of the cathode ray tube to satisfy various needs of users. .

In the accompanying drawings, FIG. 1 is a schematic diagram for explaining the preparation for the purity and convergence adjustment of the cathode ray tube, and FIG. 2 is a diagram for explaining a cathode ray tube purity and convergence adjustment method performed by using a conventional purity and convergence adjustment magnet. Referring to the drawings, a brief description of the conventional cathode ray tube purity and convergence adjusting method is as follows.

First, the deflection yoke and the convergence magnet are attached to the neck portion of the cathode ray tube, and the insulating tape 1 is wound around the magnet attachment position, and the appropriate torque is set to mount the magnet.

In this state, the purity and convergence of the cathode ray tube are adjusted by using the 2-pole magnet 11, the 4-pole magnet 12, and the 6-pole magnet 13 as illustrated in FIG. After adjusting the purity using a 2-pole magnet as a reference, use the 4-pole magnet 12 to adjust the convergence so that the R-beam and B-beam are the same amount, and finally, the 6-pole magnet 13 is used. R beam, B beam, and G beam convergence are adjusted.

However, in the conventional purity and convergence adjustment method as described above, since the convergence adjustment of the R beam and the B beam is sequentially performed on the basis of the G beam using a 2-pole, 4-pole, and 6-pole magnet, a lot of time is required for the adjustment work. There was a problem in that it takes the form of the neck process in the entire manufacturing process, causing a decrease in productivity.

Therefore, the present invention was created in view of the problems with the method of adjusting the purity and convergence of the cathode ray tube, which was performed by the conventional method as described above,

An object of the present invention is to adjust the purity and convergence of the cathode ray tube using a six-pole magnet, omitting the use of the six-pole magnet and by using a four-pole magnet so that a simple and easy adjustment can be made It is to provide a method for adjusting the purity and convergence of the cathode ray tube that can increase productivity.

Purity and convergence adjustment method of the cathode ray tube according to the present invention for achieving the above object,

Ferromagnetic magnets and weak magnetic magnets having opposite magnetic poles are placed side by side to form a 4-pole magnet,

After placing the 4-pole magnet on the neck of the cathode ray tube, first adjust the purity based on the G-beam,

The convergence is adjusted by moving one of the B beam and the R beam by moving the other of the ferromagnetic magnet and the weak magnetic magnet forming the 4-pole magnet.

The convergence is adjusted by moving the other one of the ferromagnetic magnet and the weak magnetic magnet forming the quadrupole magnet to move the other of the B beam and the R beam.

In the method for adjusting the purity and convergence of the cathode ray tube according to the present invention, in particular, when the donut-type ferromagnetic magnet and the weak magnetic magnet coincide with the center thereof, the ferromagnetic magnet has a magnetic pole downward S, based on the handle. It is preferably formed of N, and the weak magnetic magnet is preferably formed of N, S. In addition, it is preferable to adjust the convergence by moving the weak magnetic magnet among the donut type ferromagnetic magnet and the weak magnetic magnet forming the 4-pole magnet, and moving the B beam, and moving the ferromagnetic magnet to move the R beam.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the purity and convergence adjustment method of the cathode ray tube according to the present invention.

Among the accompanying drawings, Figure 3 schematically shows a diagram for explaining a method for adjusting the purity and convergence of the cathode ray tube using a purity and convergence adjustment magnet according to the present invention.

In the cathode ray tube purity and convergence method according to the present invention, first, as shown in FIG. 3, magnetic poles are formed opposite to each other, and a donut-type ferromagnetic magnet 22 having a handle 2, 2 'on the top thereof is provided. The ferromagnetic magnets 22 and the weak magnetic magnets 21 are arranged side by side so that their centers coincide with each other so that the ferromagnetic magnets 22 and the weak magnetic magnets 21 have the same ferromagnetic properties. The magnet 22 is formed with S and N magnetic poles, respectively, based on the handle 2, and the weak magnetic magnet 21 is formed with N and S.

The four-pole magnet 20 thus formed is placed in the neck portion of the cathode ray tube, and the purity is adjusted based on the G beam. Then, any one of the donut-type ferromagnetic magnet 22 and the weak magnetic magnet 21 forming the 4-pole magnet 20 is moved to move either the B-beam or the R-beam, and the 4-pole magnet ( 20, the convergence is adjusted by moving the other one of the ferromagnetic magnet 22 and the weak magnetic magnet 21 to form the other of the B beam or the R beam, in the present embodiment, the weak magnetic magnet ( 21 is moved to move the B beam, and the ferromagnetic magnet 22 is moved to move the R beam to adjust the convergence. At this time, when the beam arrangement of the electron gun is made in various patterns, the angle formed by the magnetic poles of the magnet is adjusted to move the R beam and the B beam with respect to the G beam.

As described above, according to the characteristics of the cathode ray tube purity and convergence adjusting method according to the present invention, in the method of adjusting the purity and convergence of the cathode ray tube using a conventional 6 pole magnet, the use of the 6 pole magnet is omitted. It is possible to improve productivity by easily and easily adjusting the purity and convergence of the cathode ray tube.

1 is a schematic view for explaining the preparation for the purity and convergence adjustment of the cathode ray tube,

2 is a schematic diagram for explaining a method of adjusting the purity and convergence of a cathode ray tube using a conventional purity and convergence adjusting magnet, and

3 is a schematic view for explaining a method of adjusting the purity and convergence of the cathode ray tube using the purity and convergence adjusting magnet according to the present invention.

* Explanation of symbols for main parts of the drawings

1 .. Insulation tape 11 .. 2-pole magnet 12 .. 4-pole magnet

13 .. 6-pole magnet 20 .. 4-pole magnet 21 .. Weak magnetic magnet

22 .. Ferromagnetic magnet 2, 2 '.. Handle

Claims (3)

Magnetic poles are formed opposite to each other and the donut-type ferromagnetic magnet and the weak magnetic magnet are placed side by side to form a 4-pole magnet, After placing the 4-pole magnet on the neck of the cathode ray tube, first adjust the purity based on the G-beam, The convergence is adjusted by moving any one of a donor type ferromagnetic magnet and a weak magnetic magnet to form the 4-pole magnet, and moving either one of a B beam and an R beam. And adjusting the convergence by moving the other of the ferromagnetic magnet and the weak magnetic magnet forming the 4-pole magnet to move the other of the B beam and the R beam. The method of claim 1, When the donut-type ferromagnetic magnet and the weak magnetic magnet coincide with their centers, the ferromagnetic magnet is formed with S and N downwardly with respect to the handle, and the weak magnetic magnet is formed with N and S. Cathode ray tube purity and convergence adjustment method characterized in that. The method of claim 1, Donut-type ferromagnetic magnets and weak magnetic magnets forming the 4-pole magnets The cathode beam tube is characterized by adjusting the convergence by moving the weak magnetic magnet to move the B beam, and moving the ferromagnetic magnet to move the R beam. How to adjust purity and convergence.