JPH0620594A - Assembling method for electron gun - Google Patents

Abstract

PURPOSE:To assemble an electron gun without generating stress in any grid by heat and external force. CONSTITUTION:Each tip of a plurality of supporting pins 3 is embedded in the inside of a bead glass 4 softened by heating and the plurality of supporting pins 3 are firstly connected with a solidified bead glass 4. Next, a first to a fifth grids G1-G5 installed at the base end of the respective supporting pins 3 at a prescribed position through a spacer C are respectively adhered without pressure, and then, the spacer C is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling an electron gun used in a cathode ray tube.

[0002]

2. Description of the Related Art In a conventional electron gun, as shown in FIG. 3, a support pin 3 is previously welded to or integrally protruded from each of a plurality of grids G, and each grid G is predetermined. The spacers C are supported in order and in a predetermined positional relationship with a spacer C interposed between each grid G. Next, the bead glass 4 is softened by heating, and the bead glass 4 is pressed toward each grid G to embed the tip of each support pin 3 in the bead glass 4. Then, after the bead glass 3 is solidified, the spacer C
Get rid of. This is completed by fixing the cathode and the like to the grid assembly assembled in this manner (Japanese Patent Laid-Open No. 58-1316).
No. 40).

[0003]

However, according to the above-mentioned conventional method, there is thermal contraction in the process of solidification of the bead glass 4 that has been softened by heating, and this thermal contraction easily causes an error in the size of each grid G interval. . Further, due to this influence, the extraction resistance of the spacer C after the bead glass 4 is solidified is increased, and the grid G may be damaged. Furthermore, since the bead glass 4 softened by heating is pressed against the grid G, the grid G may be deformed under pressure.

Therefore, an object of the present invention is to provide an assembling method of an electron gun which can be assembled without causing the above-mentioned inconvenience by preventing the grid from being stressed by heat or an external force.

[0005]

In the method of assembling an electron gun according to the present invention for achieving the above object, a plurality of support pins are supported in a predetermined positional relationship, and each tip of the plurality of support pins is heated. Embedded in the softened bead glass, the plurality of support pins are connected by the solidified bead glass, a plurality of grids are set in a predetermined positional relationship via a spacer, and the plurality of support pins connected by the bead glass The plurality of grids, which are set in a predetermined positional relationship with the base end, are pressurelessly bonded and fixed, and then the spacers are removed.

[0006]

[Function] The tips of a plurality of support pins are embedded in the heat-softened bead glass to solidify the bead glass. However, since the grid is not yet fixed to each support pin, stress due to heat shrinkage acts on the grid. There is no. In addition, since each grid is adhered to each support pin connected by the bead glass without pressure, no external force acts on the grid and it is not deformed under pressure. Furthermore, as described above, stress due to heat or external force acts on the grid. Therefore, the spacer does not have unnecessarily large pulling resistance.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention.

FIG. 2 shows a schematic configuration diagram of an electron gun for a color CRT. In FIG. 2, three cathodes 1
(The other two are not shown) are arranged parallel to the horizontal direction,
Each cathode 1 is supported by the electrode terminal block body 2.

The first to fifth grids G _{1 to} G ₅ are cathodes 1.
Are arranged coaxially in a vertical line at the front position. A pair of support pins 3 are fixed at vertically symmetrical positions of the grids G _{1 to} G ₅ , respectively, and the tips of the upper support pins 3 and the lower support pins 3 are attached to a pair of upper and lower bead glasses 4. Each is buried. This pair of bead glass 4
The grids G _{1 to} G ₅ are connected to each other, and the grids G _{1 to} G ₅ are arranged at a predetermined interval.

Each of the grids G _{1 to} G ₅ is set to a predetermined potential, and a predetermined electric field is formed between the grids G _{1 to} G ₅ and the like by the potential.

The convergence deflector 5 is arranged further in front of the fifth grid G ₅ , and the support pins 3 are fixed at the upper and lower positions thereof. The tips of the support pins 3 are also embedded in the pair of upper and lower bead glasses 4 in the same manner.

Thus, the center beam of the three electron beams emitted from the three cathodes 1 goes straight, but both side beams thereof have the second grid G ₂ and the third grid G _3.
It is bent toward the center by the electric field between them and once concentrated at the substantially central position of the fourth grid G ₄ . Then, after that, they are dispersed and enter the convergence deflector 5, where both side beams are again bent toward the center, and the three electron beams are adjusted so as to be concentrated at one point on the CRT screen.

Next, a method of assembling the electron gun will be described with reference to FIG.
Also, description will be made with reference to FIG. 1 (a) and 1
FIG. 3B is a diagram for explaining the procedure for assembling the electron gun. As shown in FIG. 1A, a plurality of upper support pins 3 and a plurality of lower support pins 3 forming a pair of upper and lower support pins 3 are brought into a predetermined positional relationship by a vertical pin positioning member A. Support each.

A pair of upper and lower bead glasses 4 are heated and softened by a gas burner or the like, and the respective bead glasses 4 are pressed into the respective support pins 3 so that the tips of the plurality of upper support pins 3 are inside the upper bead glass 4. First, the tips of the lower support pins 3 are embedded in the lower bead glass 4. If each bead glass 4 is left until it solidifies, each bead glass 4 has its upper support pin 3 and its lower support pin 3
Are respectively connected. Here, an error may occur in the space dimension between the support pins 3 due to the heat shrinkage of the bead glass 4, but since the first to fifth grids G _{1 to} G ₅ are not yet supported, each grid G ₁ to. There is no effect on G ₅ .

Next, as shown in FIG. 1B, the first to fifth grids G _{1 to} G ₅ and the convergence deflector 5 are housed in the grid positioning member B, and each grid G ₁
Each spacer C is interposed between G _{5 and} G ₅ and supported in a predetermined positional relationship. Then, each placed a pair of bead glasses 4 formed by coupling a plurality of support pins 3 up and down positions of the respective grids G ₁ ~G _5, the upper and lower side each grid G ₁ to the proximal end of each support pin 3 of ~G ₅ Laser bonding, which is a type of pressureless bonding, is applied to the upper and lower positions of. This support pin 3 and each grid G ₁ ~
It never is pressurized deformed because no external force at the time of bonding to each grid G ₁ ~G ₅ between G ₅ does not act.

Next, the spacers C are removed, but since the stresses due to heat and external force are not generated in the grids G _{1 to} G ₅ as described above, the spacers C are removed without an excessively large drawing resistance. be able to.

Finally, the electrode terminal block body 2 supporting the cathode 1 is assembled to the assembly bodies of the _first to fifth grids G _{1 to} G ₅ to complete the process.

[0018]

As described above, according to the present invention, a plurality of support pins are first embedded in heat-softened bead glass to be solidified, and then each grid is attached to each support pin connected by the bead glass. Since they are fixed by pressureless bonding, they can be assembled without generating stress due to heat or external force on each grid, and various inconveniences caused by these can be prevented.

[Brief description of drawings]

1A and 1B are diagrams (embodiments) illustrating an assembly procedure of an electron gun.

FIG. 2 is a schematic configuration diagram of an electron gun (example).

FIG. 3 is a diagram illustrating a procedure for assembling an electron gun (conventional example).

[Explanation of symbols]

G ₁ ~G ₅ ... first to fifth grids (grid) C ... spacer 3 ... support pin 4 ... bead glass

Claims (1)

[Claims] 1. A plurality of support pins are supported in a predetermined positional relationship, each tip of the plurality of support pins is embedded in a bead glass that is softened by heating, and the plurality of support pins are connected by a solidified bead glass, A plurality of grids are set in a predetermined positional relationship via a spacer, and the plurality of grids set in a predetermined positional relationship are respectively bonded to the base ends of the support pins connected by the bead glass without pressure. A method of assembling an electron gun, comprising fixing and then removing the spacer.