JPS6120106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When sealing an electron gun assembly of a color picture tube, the present invention measures and sets the position of the electron gun assembly with respect to the image plane accurately, and seals the electron gun assembly in a predetermined position. The present invention relates to a method and device for sealing a color picture tube.

FIG. 1 shows the color picture tube after the electron gun assembly is sealed, but when sealing the in-line electron gun assembly 11 that forms three electron beams,
An imaginary line XX passing through the center of each of the three electron beam holes
As shown in FIG. 3, it is preferable that the angle is coincident with the imaginary line HH in the long axis direction passing through the center axis of the rectangular image plane of the picture tube bulb 12. FIG. 4 shows a bad state in which the virtual lines HH and XX do not match and are twisted by θ°. Recent convergenceless color picture tubes are required to have sealing accuracy such that the twist angle error θ° is 0.4 degrees or less. Note that the above lines HH and XX are imaginary lines, so in actual adjustment, the imaginary line HH is the butt surface 13 of the valve 12 shown in FIG.
The virtual line XX is measured and managed using one side surface in the longitudinal direction of the electron gun electrode ₁₁₁ shown in FIG. 2 as a reference plane.

By the way, as shown in FIG. ₁ , the electron gun electrode 111 is electrically and mechanically connected to a stem portion 16 having a plurality of stem pins 15 arranged in the lower part of the drawing to form the electron gun assembly 11. After that, the valve 12 is assembled. When connecting the electron gun electrode ₁₁₁ and the stem portion 16, three electron beam holes ₁ of the electron gun electrode 111 are connected as shown in FIG.
Virtual line X passing through the centers of 1 ₂ , 11 ₃ , 11 ₄
Ideally, X and the imaginary line YY passing between the pair of reference stem pins 17 are orthogonal to each other, but in actual manufacturing, some twisting error α° will occur.

On the other hand, when assembling the electron gun assembly 11 and valve 12 configured in this way in the correct positional relationship, a master gauge in which the virtual lines X--X and Y--Y are accurately set is used. , the reference stem pin shown in FIG. 3 is attached to the part supporting the butt surface 13 of the bulb ₁₂ shown in FIG. 17 is fitted and supported in advance,
The valve 12 and the electron gun assembly 11 are attached to these set positions so that they are assembled in the correct positional relationship.

In other words, the above method is based on the matched virtual line H
Since the support angle of the reference stem pin 17 is determined by the virtual line YY perpendicular to the master gauge with respect to -H and XX, the electron gun electrode 11
If the imaginary line XX passing through the centers of the three electron beam holes 11 ₂ , 11 ₃ , 11 ₄ of _{No. 1} and the imaginary line Y-Y passing between the reference stem pin 17 are exactly perpendicular to each other, as shown in FIG. However, in reality, as mentioned above, there is a torsion error α°, and if left as is, this error α° will cause the electron gun electrode 11 to
This results in a torsion error of θ° of ₁ .

Therefore, the present inventors have proposed a method in which the torsional error of the electron gun assembly 11 between the reference stem pins 17 is measured in advance, and the electron gun assembly 11 is classified in advance into several types based on the measured value. I tried. For example, α゜=-10' to +10' is class A, α゜=-10' to -30' is class B, α゜=+10' to +
30' is divided into C classes, and the angle of the virtual line YY with respect to the virtual line HH (XX) is corrected and set for each class. That is, α゜=+
For C class from 10′ to +30′, the median value is +
20', so if you correct and set it to -20' in the opposite direction, the virtual line between the image plane and the electron gun electrode ₁₁₁ will be HH, X-
They can be combined so that X matches or is close to it (twisting error within ±10').

However, in the above method, the electron gun assembly 1
1 must be pre-sorted into several classes according to the torsion angle α°, and a measuring machine and an inspector are required for this purpose. Furthermore, in order to improve the sealing accuracy, it is necessary to subdivide the classification performed in advance, which requires frequent and troublesome correction work. The pre-screening must be carefully performed in a clean room to avoid contamination, deformation, etc., and cannot be easily performed anywhere. Furthermore, when making corrections, there was a possibility that the plus and minus values could be reversed by mistake, so this was not the best method.

An object of the present invention is to change the angle of the electron gun assembly with respect to the image plane by passing a laser beam between a pair of through holes provided on the side surface of the electron gun assembly facing the electron gun electrode, thereby utilizing the laser diffraction image. It is an object of the present invention to provide a method and device for sealing a color picture tube, which can be accurately and extremely easily set and sealed at a predetermined position.

That is, the method of the present invention
As shown in the figure, an electron gun assembly ₁ has a pair of through holes 14, 14 on opposite sides of an electron gun electrode 111.
1 on a freely rotatable rotary correction table 32 as shown in FIGS. a step of emitting a laser beam 58 to the through holes 14, 14;
4 and 14, and displaying the diffraction image of the laser beam 58 generated by passing through the laser beams 4 and 14 on the monitor television 52, and adjusting the rotation of the rotation correction table 32 until the displayed diffraction image appears as a predetermined image. a step of holding the bulb 12 on the bulb holder 20 at a predetermined position relative to the optical axis direction of the laser beam 58; and a step of holding the electron gun assembly 11 in the bulb 1
2; and a step of sealing the electron gun assembly 11 with respect to the bulb 12.

Further, the device of the present invention is a rotatable device in which the electron gun assembly ₁₁ is rotatably provided on the support base 25 and has a pair of through holes 14, 14 on opposite sides of the electron gun electrode 111. A correction table 32, a laser light source device 46 whose direction of emitting a laser beam is determined in advance in a direction passing through the central axis Z--Z of the image plane of the picture tube bulb 12, and a laser beam 58 from the laser light source device 46 is electronically transmitted. The through hole 1 of the gun assembly 11
4, 14, and receives a laser diffraction image generated by passing through the through holes 14, 14.
A monitor television 52 that displays the received diffraction image, a bulb holding stand 20 that holds the bulb 12 at a predetermined relative position to the optical axis direction of the laser beam 58, and a support stand 25. supporting the bulb holding stand 20 and the electron gun electrode 11;
A pair of pillars 26 having through holes 53 opposite to the through holes 14, 14 of ₁ and the rotary correction table 32 are raised to move the electron gun assembly 11 to the valve 1.
2; and means 61 for sealing the neck portion 18 of the bulb 12 and the electron gun assembly 11. .

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 5, 20 is a valve holding stand, and the first
A substantially U-shaped valve pad holder 21 that holds the pad surface 13 formed on the side of the rectangular image plane of the picture tube bulb 12 shown in the figure and sets it in a predetermined position, and a neck portion 18 of the bulb 12 connected thereto. It is composed of a neck holder 22 for holding.

A cylindrical base 24 is arranged such that one end thereof faces the lower surface of the valve holding base 20, and is configured to be rotatable along its outer circumferential direction. Reference numeral 25 denotes a support stand attached to the upper end of the base 24 as shown in the figure, and a pair of pillars (hereinafter referred to as stanchion rods) 26 connecting with and supporting the valve holding stand 20 have a rectangular shape. They are provided facing each other in the long axis direction of the surface.

Between the pair of stanchion rods 26 is a correction mechanism for correcting the electron gun electrode 111 of the in-line electron gun assembly ₁₁ forming the three electron beam holes into a predetermined positional relationship with respect to the image plane of the bulb 12. Next, details of this correction mechanism will be explained with reference to FIG. 6.

In FIG. 6, reference numeral 30 denotes a mount rod, which is provided to penetrate inside the support stand 25 and the base 24, and is configured to be movable up and down along the axial direction, and has a support flange 31 at its upper end. provided. Reference numeral 32 denotes a rotary correction table, which includes a cylindrical portion 33 disposed such that its upper end face faces the lower end surface of the neck portion 18 of the valve 12 shown in FIG. 5, and a disc provided at the lower end of the cylindrical portion 33. 34, and is rotatably supported on the support flange 31 along the outer circumferential direction.

A plurality of small holes 36 are provided on the upper end surface of the cylindrical portion 33 constituting the rotation correction table 32 to fit and hold a plurality of stem pins 15 of the stem portion 16 disposed at the lower end of the electron gun assembly 11. Further, an actuating piece 37 is provided on the outer circumferential portion of the disk portion 34 and protrudes in the radial direction, and a plurality of through holes are provided on the plate surface portion of the disk portion 34 along the direction of rotation thereof. A groove 38 is provided, and within this through groove 38 is a presser screw 39 which is screwed onto the support flange 31 and whose head prevents the disk portion 34 from floating up.
is located.

A support piece 40 is attached to the support flange 31 so as to face the actuation piece 37. Reference numeral 41 denotes a correction screw for rotationally driving the rotary correction table 32, and the tip thereof is screwed into the support piece 40 so as to be in contact with the plate surface of the operating piece 37. 42 is the actuating piece 37
A spring stretched between the support piece 40 and the support piece 40 acts to constantly press the operating piece 37 against the tip of the correction screw 41. A pair of rollers 43 are provided to sandwich the stanchion rod 26, are rotatably supported by the support flange 31, and are used to smoothly move up and down the support flange 31 by the action of the mount rod 30. It acts on

Returning to FIG. 5, as shown in the figure, the electron gun assembly 11 is mounted on the rotary correction table 32 described in FIG.
1. An optical device for position correction is placed between the _two . Note that this electron gun electrode ₁₁₁ includes a so-called convergence cap. The optical device is shown in FIG. 2, including a laser light source device 46 that emits a light beam toward the side surface of the electron gun electrode ₁₁₁ , and a laser light source device 46 that emits a light beam toward the side surface of the electron gun electrode ₁₁₁ . a pair of through holes 14,
14 includes a light receiving device that receives a laser beam 58 passing through the camera 14, for example, a television camera 49 having a built-in image pickup tube 48. The pair of through holes 14, 14 are the three electron beam holes 11 ₂ , 11 ₃ , 1 of the electron gun assembly 11.
1 horizontal electron gun electrode 11 across each center of ₄
A rectangular hole is formed on the opposite side surface of ₁ .

The laser light source device 46 is controlled to blink by a control device 50, and a spot size enlarging lens 51 is provided at its laser beam sending section. Also,
The television camera 49 is connected to a monitor television 52. Further, the stanchion rod 26 is provided with a through hole 53 for transmitting a laser beam 58, as shown in the figure.

Reference numeral 55 denotes a rotation stopper mechanism that stops the valve 12 at a predetermined position, and is provided on the side of the base 24 so as to be movable forward and backward by an operating cylinder 56, and a pair of protrusions 57 are formed on a flat surface formed on the base 24. By coming into contact with the shaped joint 28, the base 24 and the bulb holding base 20 connected thereto are moved in the long axis direction that crosses the central axis Z-Z of the rectangular image plane of the bulb 12.
That is, the virtual line HH shown in FIG. 1 is fixed so as to coincide with the laser beam 58 shown in FIG. 5.

In addition, what is indicated by the reference numeral 60 in FIG. 5 is a case in which a plurality of heads (No. 1 to No. 8 in the figure) consisting of the above-mentioned valve holding table 20, base 24, etc. are mounted in the circumferential direction, and the head is rotated. This is a multi-head support that sequentially seals the valve 12 and the electron gun assembly 11.
Since it is not directly related to the present invention, detailed explanation will be omitted.

Next, the operation will be explained.

First, the in-line electron gun assembly ₁₁ , which forms a three-electron beam hole and is composed of the electron gun electrode 111, the stem portion 16, etc., is mounted on the rotary correction table 32 shown in FIG. 6 as shown in FIG. . That is,
The stem pin 15 of the electron gun assembly 11 is fitted into the small hole 36 provided at the upper end of the rotation correction table 32. In this case, a pair of through holes 14 formed on opposite sides of the electron gun electrode ₁₁₁ are arranged so as to face the laser light source device 46 and the television camera 49, respectively. In addition, the picture tube bulb 12 is attached to the bulb holding stand 2.
0, and is fixed by the rotation stop mechanism 55 at a predetermined position where the imaginary line H-H in the long axis direction passing through the central axis Z-Z of the rectangular image plane coincides with the optical axis direction of the laser beam 58. .

When a laser beam 58 is emitted from the laser light source device 46 in this state, the laser beam 58 passes through a pair of through holes 14, 14 provided on opposite sides of the electron gun electrode ₁₁₁ , as shown in FIG. At this time, since the laser beam 58 is substantially monochromatic, the through hole 1
The overlap between 4 and 14 forms a kind of slit, which causes a strong diffraction phenomenon. That is, the laser beam 58 passes through the through holes 14, 14, generates laser diffracted lights 59, 59, reaches the image pickup tube 48 of the television camera 49, and the diffraction image is electrically magnified, as shown in FIG. A diffraction image (diffraction fringes) is displayed on the monitor television 52.

When the through holes 14, 14 are square holes, this diffraction image shows a cross-shaped pattern consisting of several laser diffraction projection images on the display section of the monitor television 52 shown in FIG.

Here, the optical axis direction of the laser beam 58 and the through hole 1
If the imaginary line XX shown in FIG. rapidly approach each other, the pitch between the diffraction images becomes minimum, and the pattern shape changes from a cross to a diamond. On the other hand, when they do not match, the more the laser diffraction images do not match, the further the several laser diffraction images on the left, right, top, and bottom of the cross-shaped pattern move away from the center of the cross-shaped pattern, and the pitch between the diffraction images also widens and disappears while changing. Therefore, by using the laser diffraction image, it is extremely easy to accurately position the electron gun assembly 11 with respect to the image plane of the bulb 12. Therefore, while monitoring the image displayed on the monitor television 52, the correction screw 41 shown in FIG.
The electron gun assembly 11 is rotated through the operating piece 37 and the rotation correction table 32, and the width of the diffraction image displayed on the monitor television 52 is adjusted until it becomes a predetermined shape. If done, the positional relationship of the virtual line XX of the electron gun assembly 11 with respect to the virtual line H-H of the image plane shown in FIG. 1 will be adjusted to the correct position (±
2' high accuracy).

Note that when the electron gun assembly 11 is set on the rotation correction table 32, if the electron gun assembly 11 is not set in a normal state, the laser diffraction image will not appear at all or a tilted cross-shaped pattern will appear. may appear, and in this case there is an advantage that the set can be corrected in advance.

Once the correct positional relationship has been set as described above, the mount rod 30 shown in FIG. and seal it with a burner 61.

In the actual sealing, the assembly of the valve 12 and the electron gun assembly 11 is sequentially transferred to each position from No. 1 to No. 8 by the multi-head support 60, and While rotating the assembly, it is sequentially heated and sealed by a burner 61 disposed on the moving part.

In such an apparatus, a rotary correction table 32 for mounting the electron gun assembly 11 on the support table 25 is provided, and a bulb holding table 20 for holding the picture tube bulb 12 on the support table 25 is mounted on a pair of stanchion rods. A through hole 53 is formed in the pair of stanchion rods 26 to face the pair of through holes ₁₄ , 14 on opposite sides of the electron gun electrode ₁₁₁ . The laser beam 58 passing through the stanchion rod 26
Since the through hole 53 of the valve holder 20 is assembled with the rotation correction table 32 on the support 25, the pair of stanchion rods 26 supporting the valve holder 20 are The light beam from the gun assembly 11 does not interfere with measurement, and therefore the bulb 12 and the electron gun assembly 1 are directed toward the pair of stanchion rods 26.
1. In particular, the electron gun electrode ₁₁ can be installed along the long axis direction of the plane, and measurement using a light beam in the long axis direction can improve accuracy compared to measurement in the short axis direction. Furthermore, if the distance between the pair of stanchion rods 26 is narrow, these stanchion rods 26 will be close to the sealing part, causing the valve 12 and electron gun assembly 11 to rotate, and the fixed burner 61 to close the valve. When the electron gun assembly 11 is sealed in the stanchion rod 12, the stanchion rod 26 becomes a shadow of the burner flame and obstructs the heating of the sealing part. Since the distance between the valve 12 and the electron gun assembly 11 can be widened corresponding to the distance between both ends of the valve 12 in the longitudinal direction, the valve 12 and the electron gun assembly 11 can be rotated and the fixed burner 61 can be used to connect the electron gun assembly 11 to the valve 12. Burner flame can also be applied well when sealing. Furthermore, it becomes possible to install the laser light source device 46 and the laser light receiving device 49 on the outside of the stanchion rod 26, and since a sufficient distance can be maintained between these devices, they can be installed in a narrow space inside the stanchion rod 26. Laser beam compared to case 5
8 can be arranged with high precision, and therefore the electron gun assembly 11 can be sealed with high precision.

Next, the embodiment shown in FIG. 8 will be described.

In this embodiment, the laser beam 58 is emitted by a prism 62, and with this configuration, the positions of the laser light source device 46 and the television camera 49 can be freely selected.

In each of the embodiments described above, it has been explained that the positions of the valve 12 and the electron gun assembly 11 are corrected when they are in a separated state. However, as in the embodiment shown in FIG. After being inserted into the neck portion 18, the laser beam 58 may be passed between the through holes 14 through the glass of the neck portion 18, and subsequent position correction operations can be performed in the same manner.
With this configuration, it is possible to seal with the burner 61 immediately after correction.

In the above embodiment, the pair of through holes 14, 14 of the electron gun electrode ₁₁₁ are the three electron beam holes 11.
₂ , 11 ₃ , and 11 ₄ are formed on opposing side surfaces in the horizontal direction that cross the centers of the bulbs 12 and 11 , and the laser beam 58 passes through the central axis of the rectangular image plane of the bulb 12 in the long axis direction, so that the image of the bulb 12 is The long axis direction of the surface coincides with the optical axis direction of the laser beam 58 to facilitate alignment and improve accuracy. However, in actual sealing, the electron gun electrode 11 ₁ The pair of through holes 14, 14 can be formed on desired opposite sides, and the laser beam 58 can be
In this case, the bulb 12 can be set at a predetermined angle with the optical axis direction of the laser beam 58, that is, the setting direction of the electron gun assembly 11. In short, it is sufficient to hold the bulb 12 at a predetermined position relative to the optical axis direction of the laser beam 58.

As described above, according to the present invention, when the electron gun assembly is sealed in the picture tube bulb, the laser beam from the laser light source device is directed into the pair of through holes of the electron gun assembly mounted on the rotary correction table. The laser beam passes through the through hole, is received and displayed on the monitor TV, and the electron gun assembly is rotated and positioned using the rotary correction table.At this time, the laser beam passes through the through hole and generates diffracted light, which is displayed on the monitor TV. The diffraction image appears as stripes.

Therefore, it has the advantage that monitoring using a monitor television can be extremely easily performed, and it can also be easily determined whether the electron gun assembly has been installed in the correct position, and that correction can be easily performed. In addition, since the position of the electron gun assembly is directly compared with the direction of the image plane without using a reference stem pin, etc., there is no need to perform prior measurement and selection of the electron gun assembly, which saves labor for the measurer. , and there is no longer a need for a measuring device for this purpose.Furthermore, since it can be confirmed visually, there is no need to make mistakes in the past, such as incorrectly setting the correction direction in the opposite direction, and high sealing accuracy can be achieved. can.
Furthermore, since the electron gun assembly can be directly set on-machine, there is no possibility of defects such as deformation due to handling during conventional pre-screening or stains due to dirt from hands. In addition, electron gun assemblies and stem pins that are often twisted and that would have been considered defective in the past can now be used as good products, improving the yield of electron gun assemblies.

In addition, in the device, a rotary correction table is provided on the support stand for mounting the electron gun, and a valve holding stand for holding the picture tube bulb is supported on the support stand via a pair of supports, and the electron gun is attached to the support stand. A through hole is formed opposite to the pair of through holes on the opposite side of the gun electrode, so that the laser beam passing between the through holes of the electron gun electrode also passes through the through hole of the column.
When the valve holder is assembled with the rotation correction table on the support, the pair of pillars that support the valve holder will not interfere with measurement due to the beam from the electron gun assembly. If the valve and electron gun assembly are provided with through holes in the long axis direction of the rectangular electrode, they can be easily installed in alignment with the long axis direction of the electron gun electrode plane, and the distance between the through holes can be increased. Therefore, the accuracy can be improved by measuring with the light beam in the major axis direction compared to measurement in the minor axis direction. Also, if the spacing between a pair of struts is narrow, these struts will have their sealing parts close together, causing the valve and electron gun assembly to rotate.
When the electron gun assembly is sealed in the bulb using a fixed burner as a sealing means, the pillars will cast a shadow on the burner flame and will hinder heating of the sealing part. Since the distance between the two ends can be made sufficiently wide to correspond to the distance between both ends of the valve in the longitudinal direction, the valve and the electron gun assembly are rotated and the electron gun assembly is sealed to the valve by a fixed burner. When doing so, you can also apply burner flame well. In addition, it is now possible to install the laser light source device and the light receiving device on the outside of the column, and because there is sufficient distance between these devices, the laser beam can be placed more precisely than when installed in a narrow space inside the column. Therefore, the electron gun assembly can be sealed with high precision.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a color picture tube to which the present invention is applied, FIG. 2 is a perspective view showing an electron gun electrode, which is a part of FIG. 1, and FIG. FIG. 4 is a plan view showing the positional relationship, FIG. 4 is a plan view showing a state where a torsion error has occurred in the positional relationship between the bulb and the electron gun assembly, and FIG. 5 is an implementation of the color picture tube sealing device according to the present invention. A perspective view showing an example,
6 is an enlarged perspective view of the main part of FIG. 5, FIG. 7 is a structural principle diagram illustrating the relationship between the light source device and the light receiving device used in the present invention and the electron gun assembly, and FIG. 8 is a perspective view showing the main parts of FIG. FIG. 9 is a perspective view showing another embodiment of the apparatus of the present invention. 11... Electron gun assembly, 11 ₁ ... Electron gun electrode, 1
1 ₂ , 11 ₃ , 11 ₄ ...Three electron beam holes, 12...
Picture tube bulb, 14...Through hole on both sides of electron gun electrode, 18...Network part, 20...Bulb holding stand, 25
...Support stand, 26...Strut, 30...Mount rod as a means for lifting the electron gun assembly and inserting it into the neck part of the bulb, 32...Rotation correction table, 46...Laser light source device, 49...Light receiving device, 52...Monitor Television, 53... Through hole, 58... Laser beam, 59... Laser diffraction light, 61... Burner as means for sealing.

Claims (1)

[Claims] 1. A step of mounting an electron gun assembly having a pair of through holes on opposite sides of the electron gun electrode on a rotatable rotation correction table, and a direction passing through the central axis of the image plane of the picture tube bulb. a step of emitting a laser beam whose emission direction is determined in advance to the through hole; a step of displaying a diffraction image of the laser beam generated by passing through the through hole on a monitor television; and a step of displaying the displayed diffraction image. a step of rotating and adjusting the rotary correction table until a predetermined image appears; a step of holding the bulb on a bulb holding table so that the bulb is at a predetermined relative position to the optical axis direction of the laser beam; A method for sealing a color picture tube, comprising the steps of: inserting the electron gun assembly into a neck portion of the bulb; and sealing the electron gun assembly with respect to the bulb. 2. The method of sealing a color picture tube according to claim 1, wherein the pair of through holes are square holes. 3. The method of sealing a color picture tube according to claim 1 or 2, wherein the pair of through holes are formed in a horizontal direction that crosses each center of the three electron beam holes. 4. The laser beam according to any one of claims 1 to 3, wherein the emission direction of the laser beam is determined in the long axis direction passing through the central axis of the rectangular image plane of the picture tube bulb. How to seal a color picture tube. 5. A rotatable rotary correction table on which an electron gun assembly having a pair of through holes is mounted on opposite sides of an electron gun electrode rotatably provided on a support table; and a central axis of the image plane of the picture tube bulb. a laser light source device whose direction of emitting a laser beam is determined in advance in a direction passing through the electron gun assembly; and a laser diffraction image generated when the laser beam from the laser light source device hits the through hole of the electron gun assembly and passes through the through hole. a light receiving device that receives the light; a monitor television that displays the received diffraction image; a bulb holding stand that holds the bulb at a predetermined position relative to the optical axis direction of the laser beam; a pair of pillars supporting the valve holding table and having a through hole opposite to the through hole of the electron gun electrode; and raising the rotation correction table and inserting the electron gun assembly into the neck portion of the valve. A sealing device for a color picture tube, comprising: means for sealing a neck portion of the bulb and an electron gun assembly.