JPH0360141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly method and an electrode structure of a cathode ray tube electron gun.

FIGS. 1 and 2 are a front sectional view and a side view showing, together with an assembly jig, an in-line electron gun electrode structure in which the main electron lens used in the prior art adopts a bi-potential focus system.

The electric gun electrode structure 1 is a closed cylindrical body in which the center and both outer holes are bored in a straight line with the same distance S between the holes, and the G1 electrodes 11 to G4 electrodes 14 are arranged at predetermined electrode intervals. maintained and configured. Here, the G3 electrode 13 constitutes an electrode structure by overlapping the open end edges of two sets of closed cylindrical electrodes.

When assembling the electron gun electrode structure 1, an assembly jig 2 is used. 21 and 22 are fitted into each outer opening, and G1-G2 and G2- are fitted between each electrode.
G3, G3-G4 spacers 23, 24, 25 are directly interposed and stacked, thereby determining the relative position of each electrode.

Each electrode stacked on the assembly jig 2 has an electrode supporter 15 integrated with the electrode, or a separately attached electrode supporter 16 that reinforces the electrode support strength, with the tip end fused and buried in an insulator support rod 17. , insulation support rod 17
After curing, G1-G2, G2-G3, G3-G4 spacer 2
3, 24, and 25 are pulled out in a direction perpendicular to the assembly jig core rods 21, 22, and then removed from the core rods 21, 22 to complete the electric gun electrode assembly 1. Spacer 23
Electrode group 11 stacked on assembly jig 2 together with ~25
~14 are fixed to the insulator support rod 17, and a pressing force is applied from the top of the G1 electrode 11 to the G4 electrode 14 side by a pressure mechanism (not shown) so that a predetermined electrode spacing is guaranteed even after the spacer is removed. . However, even if the electron gun electrode assembly is released after assembly, a pressing force remains on the stack of electrode groups and spacers, and the spacers 23 to 25
When the electrodes are pulled out, the contacting electrode surfaces are scratched, and minute protrusions, so-called burrs, occur due to peeling of the electrode surfaces. If this burr is formed on the opposing part of the G3 electrode 13 and G4 electrode 14, which are the main electron lens electrodes where a high potential difference occurs, the electric field will be concentrated in this part during the operation of the cathode ray tube, resulting in deterioration of the withstand voltage characteristics between the two electrodes, or Voltage becomes defective. On the other hand, if there are burrs on the G1 electrode 11 and the G2 electrode 12, which have a small electrode spacing of usually about 0.1 to 0.5 mm, when the spacer is pulled out, a short circuit will occur between the two electrodes during operation of the cathode ray tube. Also G3 electrode 1
The electrode spacing between G1 electrode 11 and G2 electrode 12, G2 electrode 12, and
The electrode spacing between the G3 electrodes 13 is set to a smaller value than this. In particular, as mentioned above, the G1 electrode 11
The interval between the G2 electrodes 12 is small, and if the finishing accuracy for the thickness in manufacturing the spacer is the same, the influence of the dimensional accuracy of the spacer on the electrode interval is greater as the electrode interval is smaller. Among these, there is a drawback that the gap between the G1 electrode 11 and the G2 electrode 12 becomes more dispersive, which increases the dispersion in the characteristics of the electric gun. For example, the G1-2, G3-G4 interval settings are
If the dimensional accuracy of the corresponding spacer for 0.20mm and 1.0mm is the same ±0.05mm, each thickness is 0.20±0.05
mm and 1.0±0.05mm, and the influence of dimensional accuracy tolerance is ±25% and ±5%, respectively, and the electrode spacing is small.
The effect on the G1-2 interval is five times greater than on the G3-4 interval.

Conventionally, a metal material that is softer than the electrode forming material is sometimes used to prevent the spacer from being scratched when pulled out. in this case,
Since the electrodes are made of stainless steel with a high Ni content, phosphor bronze, which is a softer material, is sometimes used for the spacer, but because the material is soft, machining accuracy is poor, and the wear is severe, resulting in a short service life. There was a short drawback.

The present invention has been made in view of the above-mentioned drawbacks, and when assembling an electric gun electrode structure by laminating a plurality of electrodes, at least one pair of electrodes facing each other has a predetermined distance from the electrode facing surface. An electric gun electrode structure and assembly, in which a positioning piece is formed by cutting out or attaching a part of the electrode cylinder to the side of the electrode tube, and a predetermined electrode spacing can be determined by abutting a spacer on the positioning piece. It provides legislation. According to the embodiment of the present invention, since the spacer does not come into direct contact with the electrode surface when assembling the electric gun electrode assembly, the electrode surface is not scratched or burred when the spacer is pulled out, and the spacer is not in direct contact with the electrode surface. Since the thickness of the electron gun can be made larger than the predetermined electrode spacing, the influence of the finishing accuracy of the spacer on the electrode spacing can be reduced, the withstand voltage characteristics of the electron gun electrode structure are improved, and high precision assembly is possible.

The present invention will be described in detail below with reference to the drawings.

FIGS. 3 and 4 show G4 according to an embodiment of the present invention.
FIG. 5 shows a perspective view of the electrode 34 and a side view of the electron gun electrode assembly 3 in the assembly jig, and FIG. 5 shows a perspective view of the spacer 45.

G4 electrode 34 of in-line electron gun electrode structure 3
The central and both outer electron beam transmission apertures 34H are arranged at equal distances S' in the approximately elliptical closed surface 34A (G4 electrode has the above-mentioned S value in order to concentrate both outer electron beams into a central beam at the center of the screen). ) with a value slightly larger than that of the closed surface 34A.
A cylinder side portion 34B is perpendicular to the cylinder side portion 34B, and a mouth edge portion 34C that is continuous with this and parallel to the closing surface 34A is integrally formed.
The center of the mouth edge 34C on the long side is the insulator support rod 17
It is a closed cylindrical body with an electrode supporter 35 embedded therein. A part of the side wall is cut and raised in a V-shape on the long-side cylinder side part 34B, and two positioning holes are provided, respectively, so that the V-shaped part is perpendicular to the cylinder side part 34B and is precisely a predetermined distance a from the closing surface 34A. A piece 37 is formed.
Furthermore, in order to reinforce the electrode support strength, an L-shaped electrode support 36 having an electrode support arm 36A buried in the insulator support rod 17 is fixed by spot welding near the center of the long side cylinder side. Similarly, G3 electrode 33,
A positioning piece 37 is also formed on the long-side cylinder side of the G1 electrode 31 by cutting and raising a part of the side wall precisely positioned from the closed surface in a V-shape. is welded and fixed to the side of the cylinder,
Reinforces electrode support strength. These G1 electrodes 31
~G4 electrode 34 is the core rods 21 and 22 (not shown) of the assembly jig 2 held upright at an interval of 2S as in the conventional case.
The outer openings are fitted into the electrodes, and the G1-G2, G2-G3, and G3-G4 spacers 43, 44, and 45 are brought into contact with the positioning pieces 37 formed on each electrode and stacked. Here, the thickness of the spacers 43, 44, 45 is the sum of the distances from the closed surfaces of the two sets of electrodes facing each other to the positioning piece 37 at a predetermined electrode interval. For example, the G3-G4 spacer 45 has a U-shape that hugs the sides of the G3 and G4 electrode cylinders, as shown in FIG.
If b is the distance from the closed surface of the G3 electrode 33 on the G4 electrode side to the positioning piece 37, then t=d+a+b. However, in the case of the G2 electrode 32 shown in FIG. 4, since the axial length of the electrode is short, the positioning piece 37 is not formed, but a mouth edge integrally formed with the electrode is used. The electrode group, which is stacked in the assembly jig 2 and the relative position of each electrode has been determined, is assembled by embedding the tip of the electrode supporter integrated with the electrode, or the electrode supporter attached separately, into the insulator support rod 17. It will be worn. This is G1− after curing
G2, G2-G3, G3-G4 spacing 43, 44, 45
is pulled out in a direction perpendicular to the assembly jig core rods 21, 22, and then removed from the core rods 21, 22 to obtain the electron gun electrode assembly 3.

In the above assembly, the spacers 43, 44, and 45 are not in contact with the electrode facing surface, so there are no scratches or burrs on the electrode surface due to the removal of the spacers during assembly. Even if scratches or burrs occur on the contact surface of the spacer 37, the G3 electrode 33 and G4, which are the main electron lens forming electrodes, are sufficiently far away from the electrode facing surface, and a high potential difference occurs due to the minute protrusions.
Poor withstand voltage between electrodes 34 or small electrode spacing
Short circuit defects between the G1 electrode 31 and the G2 electrode 32 can be completely avoided.

In addition, since the influence of scratches caused by pulling out the spacers 43, 44, and 45 is eliminated, the material for forming the spacers can be selected to be sufficiently hard, and the wear caused by their use can be minimized, and the thickness machining accuracy can be improved compared to the conventional one. It is possible to increase this even further.

Furthermore, since the thickness of the spacers 43, 44, and 45 can be made sufficiently larger than the predetermined electrode spacing, even if the thickness machining accuracy of the spacer is the same as before, the thickness machining accuracy will not match the electrode spacing accuracy. This makes it possible to minimize the impact.

Alternatively, by appropriately selecting the attachment position of the positioning piece with respect to each electrode closing surface, it is possible to make the thickness of a plurality of spacers the same, and to use spacers all having the same thickness.

FIG. 6 shows a side view of an electron gun electrode assembly 3 in an assembly jig showing another embodiment of the present invention, and FIG. 7 shows a perspective view of an electrode supporter 38 provided with a positioning piece. The electrode supporter 38 has a roughly U-shape in which an electrode support arm 38A embedded in the insulator support rod 17 and a positioning piece 38B parallel to this and having a shorter length are integrally formed. The middle part is welded and fixed to the side part of the electrode cylinder. For example, G4 electrode 3
4, the positioning piece 38 is precisely positioned and fixed at a predetermined distance a from the closed surface 34A. In assembling the electron gun electrode structure, the spacer is attached to the positioning piece 38 in the same manner as described above.
It comes into contact with B.

In the above explanation, the side part of the electrode cylinder is cut and raised, and the positioning piece integrally formed on the electrode supporter is separated from the electrode facing surface and is not embedded in the insulator support rod, so its presence reduces the withstand voltage between the electrodes. It does not deteriorate the characteristics.

Furthermore, the shape and number of the cut and raised portions on the side of the electrode cylinder are not limited to the above-mentioned example, and the present invention is applicable to various shapes such as simply cutting and raising a pair in an L shape. Not even.

As mentioned above, we have explained the electron gun electrode structure in which the main electron lens is of the bi-potential type. It goes without saying that the present invention is also applicable to type electron gun electrode structures and single electron gun electrode structures.

As described above, according to the embodiments of the present invention, it is possible to obtain an electron gun electrode structure which has extremely good withstand voltage characteristics and can be assembled with high precision, and its industrial value is extremely large.

[Brief explanation of drawings]

Figures 1 and 2 are a front cross-sectional view and a side view showing an in-line electron gun electrode assembly in which the main electron lens used in the past adopts a bipotential focus system, together with an assembly jig, and Figure 3 is a side view. , 4th
The figures are a perspective view of a G4 electrode according to an embodiment of the present invention and a side view of an electron gun electrode assembly in an assembly jig, FIG. 5 is a perspective view of a spacer, and FIGS. FIG. 7 shows a side view of an electron gun electrode assembly and a perspective view of an electrode supporter in an assembly jig according to another embodiment of the invention. 11, 31: G1 electrode, 12, 32: G2 electrode,
13, 33: G3 electrode, 14, 34: G4 electrode, 1
6, 36: Electrode supporter, 37: Positioning piece, 2
1, 22: Assembly jig core rod, 23, 24, 25, 4
3, 44, 45: Spacer.

Claims (1)

[Claims] 1. A positioning piece is provided at a predetermined distance from the electrode facing surface on the electrode cylinder side of at least one electron gun electrode facing each other among the electron gun electrodes having an electrode cylinder side and an electrode facing surface, and positioning is performed. An electron gun electrode assembly characterized in that a spacer for determining the electrode interval of the electron gun electrode assembly is brought into direct contact between the pieces so that a predetermined electrode interval can be determined.