JPH0365605B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for assembling an electron gun, and in particular, a method for assembling an electron gun, in which a plurality of grid electrodes are arranged coaxially in the tube axis direction, and the implanted portion of each grid electrode is softened. The present invention relates to a method for assembling an electron gun that can reduce deformation of a first grid electrode and misalignment between the second grid electrode and other grid electrodes when assembling the electron gun embedded in a bead glass that has been It is something.

[Technical background of the invention and its problems]

An example of a conventional method of assembling an electron gun will be explained with reference to FIGS. 4 and 5.

That is, the main components of the assembly jig 1 are a center jig 3 implanted in a support base 2 and outer jigs 6 _{1 and} 6 ₂ provided so as to be movable in the direction of arrow 5 via a core rod 4. The fifth grid electrode 7, the fourth grid electrode 8,
The third grid electrode 9, the second grid electrode 10, the first grid electrode 11, the G ₄ /G ₅ spacer 12, and the G ₃ /G ₄ spacer 1 that keep the spacing between these grid electrodes at a predetermined value.
3. G ₂ / G ₃ spacer 14, G ₁ / G ₂ spacer 15
, a spring 16 and a nest 17 for pressing the grid electrode, an upper lid 18 for fixing the pair of outer jigs 6 ₁ and 6 ₂ and the spring 16, and this upper lid 1.
It consists of lock nuts 19 ₁ and 19 ₂ for fixing 8.

To assemble the electron gun, insert the fifth grid electrode 7 with a large electron beam passage hole diameter into the center jig 3, then place the G ₄ /G ₅ spacer 12, and then insert the fourth grid electrode 7 into the center jig 3.
Grid electrode 8, G ₃ /G ₄ spacer 13, third grid electrode 9, G ₂ /G ₃ spacer 14, second grid electrode 10,
The G ₁ /G ₂ spacer 15 and the first grid electrode 11 are similarly inserted into the center jig 3, the nest 17 is placed inside the first grid electrode 11, and the spring 16 is placed on top of the nest 17. Next, the outer jigs 6 ₁ and 6 ₂ are set up, and the upper lid 18 is inserted into the outer jigs 6 ₁ and 6 ₂ and fixed with lock nuts 19 ₁ and 19 ₂ . At this time, each grid electrode 7, 8, 9, 10, 11 is pressed in the axial direction of the center jig 3 by the nest 17,
Further, a portion of the outer side of each grid electrode 7, 8, 9, 10, 11 is substantially held and fixed by outer jigs ₆₁ , ₆₂ .

After assembling in this way, bead glass 20
are heated and softened, and each grid electrode 7, 8, 9, 10,
An electron gun is obtained by implanting and fixing the implanted portions 11 to this bead glass 20.

However, in the conventional electron gun assembly method as described above, each grid electrode 7, 8, 9, 10, 11
Since the position of the grid electrode is determined and fixed by the length of each grid electrode, if the distance between the second grid electrode 10 and the first grid electrode 11 is extremely narrow (0.1 to 0.3 mm), 5 grid electrode 7, 4th
Due to the influence of variations in the lengths of the grid electrode 8 and the third grid electrode 9, the second grid electrode 10 and the first grid electrode 1
1 is often not installed at a specified position on the center jig 3, causing problems such as deformation of these grid electrodes 10 and 11 and misalignment with other grid electrodes.

For example, the fifth, fourth, and third grid electrodes 7, 8,
If the length of the grid electrode 9 is short, the first grid electrode 11 comes into contact with the stepped portion 3b of the center jig 3, causing deformation of the electron beam passage hole. Furthermore, when the lengths of the fifth, fourth, and third grid electrodes 7, 8, and 9 are long, the second grid electrode 10 comes off the reference part 3a of the center jig 3 for the second grid electrode, and This causes a center shift with respect to the grid electrode.

As a result, a cathode ray tube manufactured using such an electric gun has problems in that variations in bright spot erasing voltage and aberrations of the electron lens are significantly increased.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and provides a method for assembling an electron gun that can obtain an electron gun with good characteristics without deformation of the first grid electrode or center shift of the second grid electrode. is intended to provide.

[Summary of the Invention] That is, the present invention provides a center jig in which a reference portion into which each electron beam passing hole of a plurality of grid electrodes having different electron beam passing hole diameters is inserted is formed coaxially with a step portion interposed therebetween. The plurality of grid electrodes are arranged coaxially through spacers that hold them at predetermined intervals, and each grid electrode is implanted while pressing the plurality of coaxially arranged grid electrodes in the axial direction of the center jig. In the method for assembling an electron gun in which a portion is embedded in bead glass that has been softened by heating, a spacer for holding the first and second grid electrodes at a predetermined interval among the plurality of grid electrodes is attached to each of the first and second grid electrodes. abutting the step portion between the reference portions, and making contact with the spacer of the step portion with reference to the step portion between each reference portion and the spacer that abuts the step portion with respect to the first and second grid electrodes; The method for assembling an electron gun is characterized in that the plurality of grid electrodes are implanted in the bead glass while applying pressure from both sides in the axial direction of the center jig so that the center jig is maintained.

[Embodiments of the invention]

Next, a method of assembling the unipotential electron gun will be explained with reference to FIGS. 1 and 2.

That is, the electron gun assembly jig 31 includes a support base 32,
A fifth grid electrode 37 is supported by this support stand 32,
A center jig in which reference parts into which the electron beam passing holes of the fourth grid electrode 38, the third grid electrode 39, the second grid electrode 40, and the first grid electrode 41 are inserted are coaxially formed via a stepped part. 33 and outer jigs 36 ₁ and 36 ₂ that are movable in the direction of arrow 35 via the core rod 34 are provided on the support base 32, which is almost the same as the conventional one, but is used in this embodiment. In the electron gun assembly jig 31, a sleeve 51 supporting the fifth grid electrode 37 is disposed on the center jig 33, and this sleeve 51 is always pushed up by a sleeve spring 52. Grid electrode 37, fourth grid electrode 38, third
G ₄ /G ₅ spacers 42 and G ₃ /G ₄ spacers 4 that maintain constant spacing between the grid electrodes 39, second grid electrodes 40, and first grid electrodes 41.
3. G ₂ / G ₃ spacer 44, G ₁ / G ₂ spacer 45
, a spring 46 and a nest 47 for pressing the grid electrode, an upper lid 48 for fixing the pair of outer jigs 36 ₁ , 36 ₂ and the spring 46 , and lock nuts 49 ₁ , 49 ₂ for fixing the upper lid 48 . It is configured.

To assemble the electron gun, the fifth grid electrode 37 having a large diameter electron beam passage hole is inserted into the center jig 33 and supported by the sleeve 51. Next G ₄ /G ₅
placed on the spacer 42, and in order the fourth grid electrode 38,
G ₃ /G ₄ spacer 43, third grid electrode 39, G ₂ /
The G ₃ spacer 44, the second grid electrode 40, the G ₁ /G ₂ spacer 45, and the first grid electrode 41 are similarly inserted into the center jig 33, and the nest 47 is inserted into the first grid electrode 4.
1, and place spring 4 on top of this nest 47.
Place 6. Next, the outer jigs 36 ₁ and 36 ₂ are set up, and the upper lid 48 is inserted into the outer jigs 36 ₁ and 36 ₂ .
Secure with lock nuts 49 ₁ and 49 ₂ .

In this embodiment, the center jig 33 and G ₁ /
The relationship of the _G2 spacer 45 is as shown in Figure 2.
A through hole 53 having a diameter close to the diameter of the reference portion 33 _a1 into which the electron beam passage hole of the first grid electrode 41 of the center jig 33 is inserted is formed in the G ₁ /G ₂ spacer 45. When inserted into the reference part _33a1 , the electron beam passage hole of the second grid electrode 40 comes into contact with the stepped part _33b between the inserted reference part _33a2 . Note that the reference portion 33 _a2 is formed to have a diameter close to the diameter of the reference portion for other grid electrodes.

As described above, in this embodiment, the fifth grid electrode 37 is connected to the sleeve 51 and the sleeve spring 5.
2, and the first grid electrode 4
1 is pushed down by a nest 47 and a spring 46, and G ₁ /G between the stepped portion 33 _b between the reference portions 33 _a1 and 33 _a2 , and the first grating electrode 41 and the second grating electrode 40 that contact this stepped portion 33 _b . ₂ spacer 45 as a reference, the electron gun is assembled while applying pressure from both sides in the axial direction of each grid electrode center jig 33 so that the G ₁ /G ₂ spacer 45 is maintained in contact with the stepped portion 33b. Therefore, regardless of the length of the fifth, fourth, and third grid electrodes 37, 38, and 39, for example, the deformation of the first grid electrode 41 and the passage of the electron beam through the second grid electrode 40 can be prevented as in the conventional case. The holes 40a are assembled with the electron beam passage holes of other grid electrodes without center deviation, and bead glass 50 softened by heating is implanted in the implantation parts of each of these grid electrodes 37, 38, 39, 40, and 41. The quality of the electron gun obtained by using such an electron gun is extremely high, and the cathode ray tube manufactured using such an electron gun has no variation in bright spot extinguishing voltage and has a good quality electron lens with extremely low aberration. It was done.

In the above embodiment, the G ₁ /G ₂ spacer 45 between the first grid electrode 41 and the second grid electrode 40 is shaped like a flat plate, but the shape is not limited to this, and as shown in FIG. Tool reference part 33 _a1 , 33
Of course, the G ₁ /G ₂ spacer 66 may be formed such that the stepped portion 33b between _{the a2} portions is located in the middle of the G ₁ /G ₂ spacer 66.

Furthermore, in the above embodiment, the single electron gun is
Although the unipotential type electron gun has been described, it is not limited thereto, and is particularly suitable for assembling a structure in which the distance between the first grid electrode and the second grid electrode is narrow.

〔Effect of the invention〕

As described above, according to the method for assembling an electron gun of the present invention, an electron gun of good quality can be obtained.

[Brief explanation of drawings]

1 and 2 are diagrams showing an embodiment of the electron gun assembly method of the present invention, FIG. 1 is a partially cutaway side view for explanation, and FIG. 2 is an enlarged view of the main part of FIG. 1. , 3rd
The figure is an enlarged view of the main part of another embodiment of the present invention, FIG. 4 is an explanatory partially cutaway side view showing an example of a conventional electron gun assembly method, and FIG. 5 is an enlarged view of the main part of FIG. 4. It is. 2, 22... Support stand, 3, 33... Center jig, 3 _a , 3 _a1 , 3 _a2 ... Reference part, 3 _b , 33 _b ...
Stepped portion, 4, 34... Core rod, 6 ₁ , 6 ₂ , 36 ₁ ,
36 ₂ ... outer jig, 7, 37 ... fifth grid electrode,
8,38...Fourth grid electrode, 9,39...Third grid electrode, 10,40...Second grid electrode, 11,4
1...First grid electrode, 12,42... _G4 / _G5 spacer, 13,43... _G3 / _G4 spacer, 14,
44... _G2 / _G3 ...Spacer, 15,45...
G ₁ / G ₂ spacer, 16, 46... spring,
17,47...Nest, 18,48...Upper lid,
20, 50...bead glass, 51...sleeve, 52...sleeve spring.

Claims (1)

[Scope of Claims] 1. The plurality of grid electrodes are held at predetermined intervals in a center jig in which a reference part into which each electron beam passing hole of the plurality of grid electrodes is inserted is formed coaxially with a step part interposed therebetween. A plurality of coaxially arranged grid electrodes are arranged coaxially through a spacer, and while pressing the plurality of coaxially arranged grid electrodes in the axial direction of the center jig, the planting part of each grid electrode is planted in the heated and softened bead glass. In the method for assembling an electron gun, spacers for holding the first and second grid electrodes at a predetermined interval among the plurality of grid electrodes are attached to the first and second grid electrodes.
The step part between each reference part with respect to the grid electrode is brought into contact with the spacer, and the step part and the spacer are brought into contact with each other with respect to the step part between each reference part with respect to the first and second grid electrodes and the spacer which is in contact with this step part. A method for assembling an electron gun, characterized in that the plurality of grid electrodes are implanted in the bead glass while applying pressure from both sides in the axial direction of the center jig so that contact between the grid electrodes and the grid electrodes is maintained.