JPS6334572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method of manufacturing a cathode ray tube, and particularly to a method of attaching an electron gun to a cathode ray tube bulb.

(Prior Art) In general, a cathode ray tube has an electron gun 13 inserted into a neck portion 12 of a cathode ray tube bulb 11 and fixed at both ends, as shown in FIG. The electron beam 14 travels along the axis of the electron gun 13 and reaches the panel 15,
The phosphor on the inner surface of this panel 15 is illuminated.

In such a cathode ray tube, when the electron gun 13 is tilted and sealed, the electron beam advances as shown by the broken line 14' and does not hit point A, which is the center of the panel 15, as shown in FIG. 1b. , which corresponds to point B which deviates from this. In this case, if the screen is formed using the deflection yoke 17, the screen will be unbalanced vertically. Furthermore, if the electron beam 14' is moved to its original position by the magnet 18, the electron beam 14' will be deformed, causing aberrations and other deterioration in image quality.

Next, a conventional method of sealing a cathode ray tube will be explained. As shown in Figure 2a, the cathode ray tube bulb 1
1 supports the two mutually intersecting side surfaces of the panel 15 with three stoppers 20 for positioning in the plane direction, and presses the corner opposite the intersecting corner of the two side surfaces with a presser 21 to apply pressure. Add and fix. Further, in the vertical direction, as shown in FIG. 2b, the outer surface of the funnel 22 is supported and positioned by a support 23. And valve 11
After the electron gun receiver 24 placed corresponding to the center of the net is raised and the electron gun 13 is inserted into the neck 12 as shown in FIG. 3, it is sealed with a burner (not shown).

In this case, the sealing accuracy is as follows:
Much depends on the accuracy of the panel 15, funnel 22, neck portion 12, and electron gun 13. That is, there are also manufacturing issues, and in reality 18
For inch cathode ray tube bulbs 11, panel 15
and ±1.6mm to funnel 22, neck part 12
The eccentricity is 0.4 mm, the inclination is 0.2 degrees, and an error of about 0.1 to 0.5 mm occurs in sealing the panel 15 and the funnel 22. In addition to this, expansion due to temperature and the springs 26 and 2 of the electron gun 13, as shown in FIG.
There are also inclinations and variations due to the asymmetry of 7.

The dispersion of the electron beam on the panel 15 due to these errors is 1.6 mm deviation between the panel 15 and the funnel 22 for an 18-inch cathode ray tube.
Approximately 12 mm each, approximately 3 mm at the slope of the neck part 12
I become confused.

As described above, various factors cause rotational deviation and axis deviation (tilt) of the electron gun, both of which cause misconvergence. FIG. 12 shows a misconvergence pattern due to rotational deviation and axis deviation of the electron gun. Here, the rotational deviation and axial deviation of the electron gun refer to the rotational deviation and axial deviation of the three electron beams when the electron beams pass through a deflection magnetic field. Incidentally, since the spot position on the fluorescent surface often amplifies the above-mentioned deviation state, the spot position will be used in the explanation. FIG. 12a shows a state in which the electron gun has a rotational deviation, and in this case, the pattern is such that the blue B and the red R are vertically separated from each other in an arcuate manner on the horizontal axis. FIG. 12b shows a state in which the electron gun is axially misaligned in the vertical direction, and the pattern in this case is that blue B and red R are separated from each other in an X-shape in the left and right directions on the vertical axis. Figure 12c shows a state in which the electron gun is misaligned in the left-right direction.The pattern in this case is that the spread of blue B and red R changes toward the periphery, and blue B or red R shifts outward. . Such rotational deviation and axis deviation are misconvergence caused by the position of the electron beam when it passes through the deflection magnetic field.
This misconvergence can be reduced by making the electron beam pass through the deflection center (virtual center).

For this reason, conventionally, for example,
As shown in Japanese Patent No. 52-146168, a method is used to correct the above rotational deviation by forming a pair of light transmission holes on both sides of the electron gun and passing light through the light transmission holes. . That is, since the rotational deviation of the electron gun is a problem of rotational precision with respect to the bulb, it can be easily corrected by the pair of light transmission holes. On the other hand, the above-mentioned axis misalignment includes: (1) The stem side of the electron gun is misaligned.

(2) The converter cup side of the electron gun (fluorescent surface side of the electron gun) is misaligned with respect to the axis of the cathode ray tube.

(3) The electron gun axes are shifted in the same direction.

(4) The electron gun stem and converter cup are misaligned in opposite directions.

There are four possible types.

In the case of (1), correction can be made by providing a pair of light transmission holes as in the conventional case. In other words, if you make a pair of light transmitting holes in the electrode wall near the stem side and align the pair of light transmitting holes with the cathode ray tube axis, there will be no problem on the converter cup side, so align the electron gun axis with the cathode ray tube axis. be able to. However, in the case of (2), (3), and (4) above,
Adjustment cannot be made with a pair of light transmission holes.

(Problems to be Solved by the Invention) As described above, it is difficult to adjust the axis misalignment of the electron gun using the conventional method.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a cathode ray tube in which the axis misalignment of an electron gun can be easily adjusted, the mounting precision of the electron gun can be improved, and high-quality images can be obtained.

[Structure of the invention]

(Means for Solving the Problems) The method for manufacturing a cathode ray tube of the present invention is to transmit light in the upper and lower electrode walls in order to transmit light in the arrangement direction of the three axes of the integrated in-line electron gun or in a direction perpendicular to the direction. An electron gun having two or more pairs of light transmission holes is inserted into the neck portion of the cathode ray tube bulb, and a light source placed on the side of the neck portion transmits the light from the two or more pairs of electron gun inserted into the neck portion. Light is projected into the transmission hole, and the light that passes through the two or more pairs of light transmission holes is received by a sensor installed on the opposite side, which is enlarged and displayed on the monitor, and the two or more transmitted light that are projected here are The inclination of the electron gun is expressed by the positional relationship of the image of the hole, and the position of the electron gun pedestal that supports the electron gun is adjusted so that this positional relationship becomes a predetermined relationship.
The electron gun is set in a predetermined positional relationship within the valve neck.

(Function) In the present invention, the electron gun is supported on an electron gun holder and inserted into the neck of the cathode ray tube bulb, and the light emitted from the light source is passed through the plurality of pairs of light transmission holes of the electron gun to the detector. This is then displayed on a monitor, and the lower part of the electron gun is adjusted by moving the electron gun holder according to the deviation of each image from the set range, so that the positional relationship of each image falls within the set range.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 4 shows the outer diameter of the electron gun 13.
A converter cup 28 is the top of the electron gun 13, and a third electrode 29 is the bottom of the cup-shaped electrode.
A pair of light transmission holes 30a and 30b are provided on the side walls of the
are provided, and each of the light transmission holes 30a and 30b has a light beam axis passing through these holes, and the three of the integrated in-line electron gun
It is formed along the direction in which the book axes are arranged.

FIG. 5 shows a device for sealing the electron gun 13 having the above structure inside the cathode ray tube bulb 11. Note that parts corresponding to those shown in FIG. 2 are given the same reference numerals, and detailed explanation thereof will be omitted. In FIGS. 5a and 5b, the panel 15 of the cathode ray tube bulb 11 is positioned by the three stoppers 20 and the pusher 21, and the funnel 22 is placed on the pedestal 2.
Positioning by supporting with 3 is the same as before. Further, a light source 33 and a sensor, such as a television camera 34, are arranged on both sides of the neck portion 12 of the bulb 11. A light transmission hole 30 is formed in the electron gun 13 inserted into the network portion 12.
A, 30b is emitted from the light source 33, and the light passing through the light transmission holes 30a, 30b is transmitted to the sensor 34.
This is then enlarged and displayed on a monitor television 35 as shown in FIG. 5b.

Next, regarding the receiving part of the electron gun 13, the sixth
This will be explained with reference to FIGS. 9 to 9. In FIG. 6, long holes 40 are provided in the support rods 37 and 38 where the bulb 11 is located on both sides of the neck portion 12 to ensure a light transmission path between the light source 33 and the sensor 34. Further, as shown in FIGS. 7 and 8, the electron gun pedestal 44 includes a holding part 44a that fits with and holds the lower end stem pin of the electron gun 13, and a holding part 44a that supports the holding part 44a on the upper part. It also consists of a slide base 44b having a slide groove on the lower surface, and a slide support base 46 on which this slide base 44b is movably provided, and a spring 48 is interposed between this slide support base 46 and the slide base 44b. A screw 47 for fine movement adjustment is provided.

FIG. 9 shows the detailed structure of the holding section 44a. When the electron gun 13 is inserted into the neck portion 12 as shown in FIG. The tilt correction is performed by moving the lower end of the electron gun 13 using the slide table 44b. In this case, some clearance is required between the pin provided at the lower end of the electron gun 13 and its holding portion 44a. For example, the slide stand 44b
To move about 0.5mm, a gap of about 0.15mm is required. However, if this was used as a gap between the holding holes, it would be too large, so as shown in Figure 9, the holding hole 5
The entrance of 0 is narrowed and it is formed so that it quickly widens. As a result, the opening of the gap can be reduced to about 0.05 mm, and the movement caused by the slide is directly transmitted to the electron gun 13.

Then, to seal the electron gun 13, as shown in FIG.
Insert it into the specified position inside. In this state, light is emitted by the light source 33 shown in FIG. 5, the light passing through the plurality of pairs of light transmission holes 30a and 30b is received by the sensor 34, and an image of this light is enlarged and displayed on the monitor television 35. As shown in FIG. 5B, two images are generated, one above the other and one above the other. If the electron gun 13 is tilted due to axis deviation, the two images above and below will also shift to the left and right and fall out of the set range. Therefore, the lower end of the electron gun 13 is moved by the slide table 44b while monitoring the positional relationship between the two upper and lower images. As mentioned above, electron gun 1
Since the upper end of 3 is inserted into the neck portion 12 and positioned by the leaf spring, the inclination can be corrected by moving only the lower end. In this way, if the positional relationship between the two upper and lower images on the monitor television 35 falls within the set range, it means that the correction of the inclination is completed, and the next welding and sealing process begins. In this way, the two pairs of light transmitting holes 30a, 3
By determining the electron gun axis by 0b and moving the lower part of the electron gun 13 so that the axis passes through the center of deflection, the axis deviations caused by the above (2), (3), and (4) can be adjusted. Since the axis deviation caused by many factors is corrected as a whole rather than each factor individually, the operation is simple and the effect is great.

In the above embodiment, two pairs of light transmitting holes are provided above and below the electrode wall of the electron gun 13, but of course two or more pairs may be provided. 10 and 11 are both views of the light transmission holes 30a and 30b viewed from the light source side, but as mentioned above, FIG.
The light transmission hole 3 is arranged so that the light beam passing through 0a and 30b is along the arrangement direction of the three axes of the integrated in-line electron gun.
0a and 30b are provided. On the other hand, the 11th
In the illustrated example, light transmission holes 30a and 30b are provided so that the direction of the light beam forms a right angle to the above-mentioned direction. Both of these can correct the inclination in each direction, but by combining the two, it is possible to bring the electron beam to the center of the panel. However, in general, one of the conditions is more important than the other, and tilt correction is often performed in one direction.

〔Effect of the invention〕

According to the present invention, the electron gun axis is determined by two or more pairs of light transmission holes provided in the electron gun, and the lower part of the electron gun is moved so that the axis passes through the center of deflection.
It is possible to adjust the axis misalignment caused by various factors, and the axis misalignment caused by many factors is corrected as a whole rather than each factor individually, so it is easy to operate and has many effects. Furthermore, by increasing the precision of mounting the electron gun on the neck, the precision is improved 5 to 10 times compared to the conventional method, making it possible to provide a high quality cathode ray tube.

[Brief explanation of the drawing]

Figures 1a and 1b are side and front views showing the structure of a typical cathode ray tube and the state of the electron beam;
2a and 2b are a plan view and a side view showing a conventional sealing device, FIG. 3 is a partial sectional view showing the relationship between a conventional electron gun and a neck portion, and FIG. 4 is an electron gun used in the present invention. FIGS. 5a and 5b are a perspective view showing an embodiment of the present invention; FIGS.
The figure is a perspective view showing the electron gun holder and related parts of the device shown in Fig. 5, Fig. 7 is an exploded perspective view showing the electron gun holder shown in Fig. 6, and Fig. 8 is an exploded perspective view of the electron gun holder shown in Fig. 6. 9 is a partial sectional view showing the electron gun holding part of the electron gun holder, and FIGS. 10 and 11 are side views showing the light transmission hole of the electron gun as seen from the light source. , FIG. 12 is an explanatory diagram showing the state of rotational deviation and axis deviation of the electron gun. 11... Braun tube bulb, 12... Network part, 13... Electron gun, 30a, 30b... Light transmission hole, 33... Light source, 34... Sensor, 34... Monitor TV, 44... Electron gun holder The stand.

Claims (1)

[Claims] 1 An electron gun having two or more pairs of light transmission holes on the top and bottom of the electrode wall to transmit light in the arrangement direction of the three axes of the integrated in-line electron gun or in a direction perpendicular to the direction is connected to the cathode ray tube bulb. A light source inserted into the neck part and placed on the side of the neck part emits light into the two or more pairs of light transmission holes of the electron gun inserted into the neck part, and the light passes through the two or more pairs of light transmission holes. The light is received by a sensor installed on the opposite side, magnified and displayed on a monitor, and the tilt of the electron gun is expressed by the positional relationship of two or more transmitted light images projected here. A method for manufacturing a cathode ray tube, comprising adjusting the position of an electron gun pedestal that supports an electron gun so that the relationship is in a predetermined relationship, and setting the electron gun in a predetermined positional relationship within a neck portion of a bulb.