JPH11111178A - Adjustment method of crt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust well the convergence of CRT monitor or TV by measuring the convergence under the condition where a deflection yoke not adjusted is mounted in the body of CRT, and adjusting both the yoke and the CRT body at one time according to the result of measurement. SOLUTION: In a CRT maker or TV maker, under the condition where a deflection yoke 11 not adjusted is mounted in a CRT body 10 to be used actually, the convergence is measured by the use of e.g. a display analyzer, and based on the result the yoke 11 and the CRT body 10 are adjusted under their integrated condition. Accordingly, the adjustment considering scattering in CRT bodies 10 with deflection yokes 11 to be used actually is made possible, thereby enabling high quality adjustment and improving the performance of TV adjusted, and also dispensing with the adjustment of deflection yoke in a deflection yoke maker, resulting in cost reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting a CRT used for a television or a display for a personal computer.

[0002]

2. Description of the Related Art A CRT (Cathode-Ray Tube; used for a CRT monitor, a television, and the like).
The cathode ray tube) has an electron gun and a phosphor screen enclosed in a high-vacuum glass outer tube. The neck of the cathode ray tube deflects the electron beam emitted from the electron gun. A deflection yoke is mounted.

[0003] The deflection yoke is generally manufactured by its specialized manufacturer and delivered to a CRT manufacturer or a television manufacturer. A CRT maker manufactures a CRT main body and integrates the CRT main body with a deflection yoke and other components by using an ITC (Integrated Tube).
In a component and components process, the deflection yoke supplied from the deflection yoke maker is mounted on the CRT body, and the television or CRT monitor is finally assembled and manufactured (hereinafter, referred to as "television maker"). The television maker assembles the purchased CRT together with other parts into a television or the like and ships it to a store. In some cases, a television maker purchases a deflection yoke directly from a deflection yoke maker and performs an ITC process by itself to assemble a finished product.

When a deflection yoke maker manufactures a deflection yoke, it usually adjusts the manufactured deflection yoke before shipping it to a CRT maker or a television maker. In this adjustment, a manufactured deflection yoke is mounted on a standard CRT that has been calibrated in advance, and it is checked whether the convergence is within a predetermined range defined by the standard. On the other hand, CRT makers and television makers also
When the deflection yoke supplied from the deflection yoke maker is attached to the CRT body in the process C, the convergence is adjusted due to a deviation between the center axis of the CRT body and the center axis of the deflection yoke, a mounting error in the front-rear position, and the like.

[0005]

As described above, in the deflection yoke maker, the adjustment of the deflection yoke after the manufacturing is performed by the CRT maker or the television maker, after the ITC process is completed, the convergence is set to a predetermined value. There is an advantage that adjustment within the range of becomes easy.

However, the CRT used for adjustment by the deflection yoke maker is not the CRT to which the deflection yoke is finally mounted, but the standard CRT which has been calibrated in advance as described above. For this reason, the variation in the characteristics of each CRT to which the deflection yoke is actually mounted is not considered. Therefore, in an extreme case, the adjustment may be performed even on the deflection yoke which does not need to be adjusted in relation to the CRT mounted as an actual product. In that case, adjustments are made in the CRT maker or the television maker so that they are restored again.

The deflection yoke is adjusted by attaching a magnetic material such as a ferrite sheet. However, a CRT manufacturer or a television manufacturer usually does not peel off the ferrite sheet once applied by the deflection yoke manufacturer. The adjustment is made by attaching another ferrite sheet. If the ferrite sheet is excessively stuck in this way, even if the convergence can be kept within a predetermined range defined by the standard, it is difficult to adjust the convergence more than that.

Further, since the adjustment by the deflection yoke maker and the adjustment after the ITC process are performed with almost the same adjustment work, it is troublesome twice in the whole manufacturing process of the CRT monitor and the television, and However, the cost is increased accordingly. The present invention has been made based on the above circumstances, and enables a better adjustment of the convergence of a CRT monitor and a television, as well as eliminating unnecessary adjustment from the viewpoint of the entire manufacturing process and reducing the cost accordingly. It is an object of the present invention to provide a method of adjusting a CRT that can be performed.

[0009]

According to the first aspect of the present invention, there is provided a method of mounting an unadjusted deflection yoke on a CRT body using the deflection yoke.
A step of measuring convergence in a state where the unadjusted deflection yoke is mounted on the CRT main body, and a step of collectively adjusting the deflection yoke and the CRT main body based on a result of the measurement of the convergence. It is characterized by doing.

According to a second aspect of the present invention, in the first aspect, the step of measuring the convergence includes:
It is characterized by using a display analyzer.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of a CRT main body, FIG. 2 is a longitudinal sectional view of a deflection yoke, and FIG.
It is a longitudinal section showing the state where the deflection yoke was attached to the T main part. The deflection yoke 11 is manufactured by winding a coil around a plastic frame a predetermined number of times. Inside the CRT body 10, an electron gun 20, a three-color fluorescent film 21, a shadow mask 22
Etc. are vacuum sealed.

The deflection yoke 11 is generally manufactured by a specialized manufacturer and delivered to a CRT manufacturer or a television manufacturer. A CRT maker or the like manufactures the CRT main body 10 and performs an ITC process for integrating the CRT main body 10 with the deflection yoke 11 and other components.
The deflection yoke 11, the convergence yoke 12, the color-purifying magnet (CPM) 13, and the like provided by the deflection yoke manufacturer are mounted on the CRT main body 10.

Hitherto, when the deflection yoke maker manufactures the deflection yoke 11, it has adjusted the manufactured deflection yoke before shipping it to a CRT maker or a television maker that performs an ITC process. The method attaches a manufactured deflection yoke to a pre-calibrated standard CRT and uses a dedicated measuring instrument to see if the convergence is within a predetermined standard. When the convergence is out of the predetermined range, the convergence is kept within the predetermined range by attaching a ferrite sheet to an appropriate location of the deflection yoke while measuring the convergence.

On the other hand, a CRT maker or a television maker performing an ITC process also needs a CRT
When the deflection yoke 11 supplied from the deflection yoke maker and other parts are mounted on the main body 10, the CRT main body 10
Of the deflection yoke 11 and the center axis of the deflection yoke 11, and the convergence due to a mounting error in the front-rear position. In this case as well, check whether the convergence is within the range of the standard using a dedicated measuring instrument. If the convergence is out of the range, remove the deflection yoke and temporarily attach the magnetic material such as a ferrite sheet to the deflection yoke or the CRT body. The work of attaching and adjusting the deflection yoke to the CRT body again is performed. However, the difference from the adjustment by the deflection yoke maker is that the adjustment by the deflection yoke maker uses the standard CRT, whereas the adjustment after the ITC process is the CRT that is actually mounted as the deflection yoke and shipped as a product. The point is to use.

Conventionally, in a deflection yoke maker, adjustment of a deflection yoke after manufacturing using a standard CRT has been performed so that convergence within a predetermined range after an ITC process is completed in a CRT maker or a television maker. There was a merit that adjustment to fit in was easy. However, the adjustment by the deflection yoke maker requires that each CR to which the deflection yoke is actually mounted be mounted.
Since the variation in the characteristics of T is not taken into account, unnecessary adjustments may be made when viewed from a CRT mounted as an actual product. For the deflection yoke on which the magnetic material such as the ferrite sheet is excessively attached, the CR
When the T maker or the television maker adjusts by attaching the ferrite sheet again, it becomes difficult to make a better adjustment.

Further, since the adjustment performed by the deflection yoke maker and the adjustment performed by the CRT maker perform almost the same adjustment, it is troublesome twice in view of the entire manufacturing process, and the cost is further increased. Was supposed to be. Therefore, in the present embodiment, the deflection yoke 11 is not adjusted by the deflection yoke maker, and the deflection yoke maker ships the deflection yoke 11 which has not been adjusted after the manufacture, and the ITC of the CRT maker or the television maker ships.
In the process, when the deflection yoke 11 supplied from the deflection yoke maker is mounted on the CRT main body 10, the convergence is adjusted only once. On this occasion,
The convergence is measured for the CRT on which the deflection yoke or the like is mounted by the ITC process, and based on the result, the deflection yoke is removed from the CRT main body, the ferrite sheet is attached to a predetermined portion, and adjustment is performed. The work of attaching the yoke to the CRT body is performed. However,
Depending on the degree of adjustment, the adjustment may be completed simply by inserting a ferrite sheet between the CRT main body and the deflection yoke without removing the deflection yoke from the CRT main body.

In this case, since the adjustment is not performed by the deflection yoke maker, it is difficult for the CRT maker or the television maker to perform the adjustment, which may cause a heavy burden. However, for example, by using a display analyzer MULTI-20 manufactured by Theft (Theft Laboratories, Inc.), convergence can be measured quantitatively and accurately. You can easily find out what to do. The above-mentioned display analyzer is disclosed in Japanese Patent Application Laid-Open No. 7-49660 (Japanese Patent Application No. 4-210628) and Japanese Patent Application Laid-Open No.
4 (Japanese Patent Application No. 7-338630) and Japanese Patent Application No. 9-12.
No. 3883, Japanese Patent Application No. 9-123884, and the like can be referred to.

As described above, in a CRT manufacturer or a television manufacturer, using a display analyzer capable of quantitatively and accurately measuring convergence,
Since the convergence is adjusted in consideration of the variation of the CRT to which the deflection yoke is finally mounted, higher-quality adjustment than before can be performed, and the performance of a television or the like after the adjustment can be improved. Further, since adjustment by the deflection yoke maker is not required, the cost of the final product can be reduced accordingly.

[0019]

As described above, according to the present invention,
With the unadjusted deflection yoke mounted on the CRT main body in which the deflection yoke is actually used, convergence was measured using, for example, a display analyzer, and based on the result, the deflection yoke and the CRT main body were integrated. Since the adjustment is made in the state, the CR that actually uses the deflection yoke is used.
Adjustment can be performed in consideration of the variation in T, and therefore, higher quality adjustment than before can be performed, and the performance of a television or the like after adjustment can be improved. Also,
It becomes unnecessary to adjust the deflection yoke by the deflection yoke maker, and it is possible to provide a CRT adjustment method capable of eliminating wasteful adjustment in the entire manufacturing process and reducing the cost accordingly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a CRT main body.

FIG. 2 is a longitudinal sectional view of a deflection yoke.

FIG. 3 is a longitudinal sectional view showing a state in which a deflection yoke is mounted on a CRT main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 CRT main body 11 Deflection yoke 20 Electron gun 21 Three-color fluorescent film 22 Shadow mask

Claims (2)

[Claims] A step of mounting an unadjusted deflection yoke on a CRT main body using the deflection yoke; a step of measuring convergence with the unadjusted deflection yoke mounted on the CRT main body; Adjusting the deflection yoke and the CRT body collectively on the basis of the result of the measurement of the convergence. 2. The CRT adjustment method according to claim 1, wherein a display analyzer is used in the step of measuring the convergence.