JPH07296724A - Assembling method on electron gun for cathode-ray tube - Google Patents

Abstract

PURPOSE:To improve assembling accuracy of an electron gun for a cathode--ray tube. CONSTITUTION:Electron beam passing holes which are formed in a plurality of electrodes G1-G6 respectively are made to penetrate stepped regular bars 4a-4c having at least one step face in an assembling device and spacers 9a-9f for regulating the electrode intervals are inserted between respective electrodes so as to be incorporated in the assembling device. In an assembling method on an electron gun for a cathode-ray tube by which a plurality of electrodes incorporated in the assembling device are fixedly blanted in an insulation bar 10, a plurality of electrodes are incorporated in the assembling device in such a state as setting at least one step face of the stepped regular bars as a datum face in the central axis direction of the stepped regular bars.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling an electron gun for a cathode ray tube, such as an electron gun for a color cathode ray tube.

[0002]

2. Description of the Related Art Generally, an electron gun for a cathode ray tube is assembled by implanting and fixing a plurality of electrodes having electron beam passage holes and a cathode holder on an insulating support rod, and then attaching a cathode to the cathode holder.

FIG. 4 shows an assembly apparatus for implanting and fixing a plurality of electrodes and a cathode holder on an insulating support rod.
This assembling device is an assembling device for an electron gun for a color cathode ray tube, and has a lower reference stand 1 and an upper reference stand 3 fitted and fixed to a column 2 provided upright on the lower reference stand 1. The lower reference table 1 is provided with three stepped regulation rods 4a to 4c for regulating the coaxiality of a plurality of electrodes (grids), and the upper reference table 3 is provided with three stepped regulation rods 4a to 4c. The stepped regulating rods 5a to 5c are the stepped regulating rods 4a to 4 of the lower reference platform 1 described above.
They are provided so as to be coaxial with c. Further, a pressurizing member 6 is provided on the upper reference table 3 and each step regulation rod 5a is provided.
.About.5c through a buffer spring mechanism having a spring 7 as a main component, the stepped regulation rods 4a to 4c, 5a to 5
It is formed in a structure that pressurizes the plurality of electrodes and the cathode holder inserted in c.

The assembly of the electron gun for the color cathode ray tube is shown in FIG.
As shown for an electron gun with 6 grids in
The step control rods 4a to 4c provided on the lower reference table are first
Through the electron beam passage holes of the sixth grids G1 to G6,
Insert in order of G6 → G1 and each grid G1 ~
Insert spacers 9b to 9f between G6. On the other hand, the cathode holders KHa, KHb, KHc are inserted through the stepped regulation rods 5a-5c provided on the upper reference table. A spacer 9a is arranged on the first grid G1 inserted through the stepped regulation rods 4a to 4c of the lower reference table, and the cathode holders KHa, KHb, KHc are arranged on the columns of the lower reference table.
The inserted upper reference base is fitted and fixed, and pressure is applied by the pressurizer via the buffer spring mechanism provided on the upper reference base. After that, the grids G1 to G6 and the cathode holders KHa, KHb, KHc incorporated in this assembling apparatus are planted in a pair of heat-softened insulating support rods 10. Then, after the insulating support rod 10 is cooled and solidified, the electron gun integrally fixed by the insulating support rod 10 is taken out from the assembling device, and the spacers 9a to 9f are taken out from the taken out electron gun to assemble.

However, in this method of assembling the electron gun, the six grids G1 to G6 and the spacer 9a are used with the plane A (see FIG. 4) of the substrate portion 12 of the lower reference stand 1 shown in FIG. 4 as a reference plane.
~ 9f are stacked and assembled, so that each grid G1 to G6
There is a problem that the position accuracy of is insufficient. In particular Figure 6
The first, second, and third grids G1, G2, shown enlarged in FIG.
The G3 triode requires high assembly accuracy,
It is difficult to assemble the three poles with the required accuracy.

That is, the assembling precision of the three poles is such that the grid spacing is the spacer 9 inserted between them.
It is regulated by b and 9c, and the axial deviation is regulated by stepped regulation rods 4a to 4c (only 4a is shown), but the first, second and third grids G1 and G2 constituting the three poles are regulated.
, G3, since they are arranged at the position farthest from the A surface of the lower reference table, the length of the center axis of each grid and the spacer 9d which are arranged on the A surface side of the lower reference table with respect to the three poles. Thickness errors of ~ 9f are integrated. Therefore, the regulation by the step regulation rods 4a to 4c becomes insufficient, and the grids G1, G2, and G3 forming the three-pole portion are likely to be misaligned. Further, in order to make the intervals between the grids G1 to G6 accurate, if the pressure applied by the pressurizer 6 is increased, the grid is deformed. Also, the assembled electron gun to spacer 9a
When ~ 9f is pulled out, it damages the grid and causes poor pressure resistance.

[0007]

As described above, in the electron gun for a cathode ray tube, the electron beam passage holes of a plurality of grids are inserted into the stepped regulation rod provided on the lower reference stand of the assembling apparatus, and After inserting a spacer between the grids, fitting and fixing the upper reference table to the lower reference table, the grid and the cathode holder incorporated in this assembly apparatus are planted on a heat-softened insulating support rod for assembly. However, in this electron gun assembling method, since a plurality of grids and spacers are stacked and assembled with reference to the reference surface (A surface) provided on the lower reference table, the positional accuracy of each grid becomes insufficient. There is. For the triode part that requires particularly high assembly accuracy, the errors in the axial length of the grid and the thickness of the spacer arranged on the reference plane side of the lower reference table relative to the triode part are accumulated. Therefore, the regulation by the stepped regulation rod becomes insufficient, and the axis is easily displaced. In addition, if the pressure applied by the pressurizer is increased in order to make the intervals between the grids accurate, the grid will be deformed and the grid will be damaged when the spacers are removed from the assembled electron gun, causing pressure failure. There are problems such as.

The present invention has been made to solve the above problems, and an object thereof is to obtain a method of assembling an electron gun for a cathode ray tube with high assembly accuracy.

[0009]

A plurality of electrodes are inserted through a stepped regulation rod having at least one step surface of the assembling device, and a spacer for regulating an electrode interval is inserted between the electrodes to form an assembling device. In an assembling method of an electron gun for a cathode ray tube in which a plurality of electrodes incorporated in this assembling device are implanted and fixed on an insulating support rod, at least one step surface of the step regulating rod is the center of the step regulating rod. A plurality of electrodes were incorporated into the assembling device as an axial reference surface.

More specifically, a spacer is brought into contact with at least one step surface of the stepped regulation rod to incorporate a plurality of electrodes into the assembly apparatus.

Further, a plurality of electrodes inserted into the step regulation rod and spacers inserted between the respective electrodes are provided via buffer spring mechanisms arranged on both ends of the step regulation rod in the central axis direction. It was made to pressurize.

[0012]

As described above, at least one step surface of the step regulation rod is used as a reference surface in the central axis direction of the step regulation rod, and a spacer is brought into contact with the at least one step surface to form a plurality of electrodes. By incorporating the above, it is possible to disperse the accumulated error of the lengths of the plurality of electrodes in the central axis direction and the thickness of the spacer in the conventional assembling method with the step surface as a boundary, and to improve the accuracy of the axis deviation of the electrodes. .

Further, a plurality of electrodes inserted into the step regulation rod and spacers inserted between the respective electrodes are provided via buffer spring mechanisms arranged on both end sides in the central axis direction of the step regulation rod. By applying the pressure, it is possible to more stably and surely improve the axis deviation accuracy of the electrode inserted through the step regulation rod with at least one step surface of the step regulation rod as a reference surface.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 3 shows an apparatus for assembling an electron gun for a color cathode ray tube according to the embodiment. This assembling apparatus has a lower reference stand 1 and an upper reference stand 3 fitted and fixed to a plurality of columns 2 provided upright on the lower reference stand 1. The lower reference stage 1 is provided with three step regulation rods 4a to 4c for regulating the coaxiality of a plurality of electrodes, and the upper reference stage 3 is provided with three step regulation rods for supporting the cathode holder. The rods 5a to 5c are provided so as to be coaxial with the stepped regulation rods 4a to 4c provided on the lower reference base 1. Further, a pressurizing element 6 is provided on the upper reference base 3, and each stepped regulation rod 4a-4c is provided via a buffer spring mechanism mainly composed of a spring 7 arranged around each stepped regulation rod 5a-5c. , 5a to 5c, and a structure for pressurizing the plurality of electrodes and the cathode holder.

Further, in this assembling apparatus, the reference surface portion 2 which supports the three step regulation rods 4a to 4c of the lower reference table 1 is provided.
0 is configured to be movable back and forth in the direction of the central axis of each of the stepped regulation rods 4a to 4c.
A buffer spring mechanism having a spring 22 disposed inside of the main structure is movable in the central axis direction of each of the stepped restriction rods 4a to 4c.

The assembly of the electron gun for the color cathode ray tube is shown in FIG.
As shown in FIG. 6, the electron beam passage holes of the first to sixth grids G1 to G6 are inserted into the stepped regulation rods 4a to 4c of the lower reference table in the order of G6 to G1 and the grids G to G1 are inserted.
Insert spacers 9b to 9f between 1 and G6. on the other hand,
The cathode holder K is attached to the stepped regulation rods 5a to 5c of the upper reference table.
Insert Ha, KHb, and KHc. The first grid G1 inserted through the stepped regulation rods 4a to 4c of the lower reference table
A spacer 9a is arranged on the upper side, and the upper reference table in which the cathode holders KHa, KHb, KHc are inserted is fitted and fixed to the column of the lower reference table, and a buffer spring mechanism provided on the upper reference table is used to fix the spacers. Pressurize with a presser. By this pressurization, the first to sixth grids G1 to G6 inserted through the stepped regulation rods 4a to 4c of the lower reference stage and the cathode holders KHa arranged on the stepped regulation rods 5a to 5c of the upper reference stage,
KHb and KHc are pressed and sandwiched by the compressive force of the spring of the buffer spring mechanism provided on the upper reference table and the compressive force of the spring of the buffer spring mechanism provided on the lower reference table by the pressurizer.

At this time, in assembling the electron gun of this example,
As shown in the enlarged view of FIG. 2, a spacer 9c is inserted between the second grid G2 and the third grid G3 of the three-pole part composed of the first, second and third grids G1, G2 and G3.
Of the two spacers 9c1 and 9c2, the spacer 9c1 arranged on the second grid G2 side is divided into the spacers 9c1 and 9c2 on the step surface 24 of the step regulation rods 4a to 4c (only 4a is shown). The spacer 9c2, which abuts and is arranged on the side of the third grid G3, adheres closely to the back surface of the spacer 9c1 and supports it from the side of the third grid G3. That is, the assembly of the electron gun of this example is performed by the stepped regulation rods 4a to 4c of the lower reference table.
Of the first, second, and third grids G1, G2, G3 using the step surface 24 formed in the portion corresponding to the three poles of
The arrangement of the step regulation rods 4a to 4c in the direction of the central axis is regulated.

To assemble the electron gun, the grids G1 to G6 and the cathode holders KHa, KHb and KHc assembled in the assembly apparatus as described above are heated to 1300 to 1400 ° C. by a gas burner and then softened. The glass insulating support rod 10 is planted. And insulating support rod 1
After 0 is cooled and solidified, the electron gun integrally fixed by the insulating support rod 10 is taken out from the assembling apparatus. After that, the spacers 9a to 9f are taken out from the taken out electron gun to be assembled.

When the electron gun is assembled as described above, the first to sixth members inserted through the stepped regulating rods 4a to 4c of the lower reference base 1 are inserted.
Of the grids G1 to G6, the third, fourth, fifth, and sixth grids G3, G4, G5, and G6 are assembled by using the A surface of the reference surface portion 20 of the lower reference platform 1 as a reference surface, and 2,
The third grids G1, G2, G3 and the cathode holders KHa, KHb, KHc are assembled with the stepped surface 24 of the step regulation rods 4a-4c as a reference surface. Therefore, in the conventional assembling method in which the surface A of the lower reference table is used as the reference surface, the error in the length of each grid in the central axis direction and the thickness of the spacer inserted between them is integrated, and the regulation by the step regulation rod is performed. However, the axis of the grid forming the three-pole portion farthest from the surface A of the lower reference platform is apt to be displaced. However, in the assembly method of this example, the three-pole portion is particularly likely to have the step regulation rod 4a. 4c are assembled using the step surface 24 formed in the portion corresponding to the three poles as a reference surface, and the second grid G2 and the spacers 9b and 9c1 are arranged between the step surface 24 and the first grid G1. Therefore, the cumulative error of the length of the grid in the central axis direction and the thickness of the spacer with respect to the triode can be significantly reduced. Moreover, when the stepped surface 24 formed in the portion corresponding to the three poles is used as the reference surface, the insertion portions of the first and second grids G1 and G2 of the step regulation rods 4a to 4c can be lengthened. The step regulation rods 4a to 4c can sufficiently regulate the first and second grids G1 and G2 to reliably prevent the axis deviation.

Further, the stepped surface 24 of the step regulation rods 4a-4c
As the reference plane, the first to sixth grids G1 to G6 inserted into the stepped regulation rods 4a to 4c of the lower reference table 1 and the cathode holder KHa arranged on the stepped regulation rods 5a to 5c of the upper reference table 2 , KHb, KHc and the first to sixth grids G1 to G6, cathode holders KHa, KHb,
Since the spacers 9a to 9f arranged between the KHc are pressed and sandwiched from both sides by the compressive force of the buffer spring mechanism provided on the upper reference table 2 and the buffer spring mechanism provided on the lower reference table 1, the conventional spacers 9a to 9f are clamped. The positions of the grids G1 to G6 and the cathode holders KHa, KHb, KHc can be sufficiently regulated even if the pressure of the pressurizer 5 is weakened as compared with the assembly of the electron gun. As a result, it is possible to significantly reduce deformation and scratches when the spacers 9a to 9f are removed after the electron gun is assembled.

In the above embodiment, the assembly of the color CRT electron gun having six grids has been described, but the present invention can be applied to the assembly of the color CRT electron gun having different numbers of electrodes. It can also be applied to the assembly of cathode ray tube electron guns other than cathode ray tube electron guns.

[0023]

According to the present invention, a plurality of electrodes are inserted through a stepped regulation rod having at least one step surface of the assembling device, and a spacer for regulating the electrode interval is inserted between the electrodes and incorporated into the assembling device. In an assembling method of an electron gun for a cathode ray tube in which a plurality of electrodes incorporated in a device are implanted and fixed to an insulating support rod, at least one step surface of the step regulating rod is used as a reference in the central axis direction of the step regulating rod. Assembling a plurality of electrodes as a surface into the assembling device and assembling the plurality of electrodes into the assembling device by bringing the spacer into contact with the step surface, the lengths of the plurality of electrodes in the central axis direction and the spacers in the conventional assembling method can be improved. It is possible to disperse the accumulated error of the thickness at the stepped surface as a boundary, and improve the accuracy of the axis deviation of the electrodes.

Further, a plurality of electrodes inserted into the step regulation rod and spacers inserted between the respective electrodes are provided via buffer spring mechanisms arranged at both end sides in the central axis direction of the step regulation rod. By applying the pressure, it is possible to more stably and surely improve the axis deviation accuracy of the electrode inserted through the step regulation rod with at least one step surface of the step regulation rod as a reference surface.

[Brief description of drawings]

1A is a top view of a grid and a cathode holder of an electron gun for a color CRT incorporated in an electron gun assembling apparatus for explaining an embodiment of the present invention; FIG.
(B) is the front view.

FIG. 2 is a diagram showing the triode.

FIG. 3 is a diagram showing a configuration of an electron gun assembly device for a color cathode ray tube according to an embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional electron gun assembly apparatus for a color cathode ray tube.

5 (a) is a top view of a grid and a cathode holder of an electron gun for a color cathode ray tube incorporated in a conventional electron gun assembly apparatus, and FIG. 5 (b) is a front view thereof.

FIG. 6 is a diagram showing the triode.

[Explanation of symbols]

 1 ... Lower reference stand 3 ... Upper reference stand 4a-4c ... Step control rod 5a-5c ... Step control rod 6 ... Pressurizer 7 ... Spring 9a-9f ... Spacer 9c1, 9c2 ... Spacer 10 ... Insulation support rod 20 ... Reference surface portion 22 ... Spring 24 ... Step surface G1 ... First grid G2 ... Second grid G3 ... Third grid G4 ... Fourth grid G5 ... Fifth grid G6 ... Sixth grid KHa, KHb. KHc ... Cathode holder

Claims (3)

[Claims] 1. An assembly apparatus, wherein a plurality of electrodes are inserted through a stepped regulation rod having at least one step surface, and a spacer for regulating an electrode interval is inserted between the electrodes to be incorporated in the assembly apparatus. In an assembling method of an electron gun for a cathode ray tube, wherein a plurality of electrodes incorporated in this assembling device are planted and fixed on an insulating support rod, at least one step surface of the step regulating rod is a center of the step regulating rod. A method for assembling an electron gun for a cathode ray tube, characterized in that the plurality of electrodes are incorporated in the assembling device as an axial reference surface. 2. The method of assembling an electron gun for a cathode ray tube according to claim 1, wherein a spacer is brought into contact with the stepped surface of the stepped regulation rod to incorporate a plurality of electrodes into the assembling apparatus. 3. A plurality of electrodes inserted through the stepped regulation rod and spacers inserted between the electrodes are provided via buffer spring mechanisms arranged on both ends of the stepped regulation rod in the central axis direction. The method for assembling an electron gun for a cathode ray tube according to claim 1, wherein the method is performed by applying pressure.