JPH02265143A - Assembling method of electron gun for cathod-ray tube - Google Patents

Abstract

PURPOSE:To improve concentricity of axes of electrode opened holes and obtain cathode-ray tubes with uniforms quality by carrying out sliding fixation of composite electrodes which compose an electron beam on a bearing jig. CONSTITUTION:Electrodes 30, 40, a spacer 10, and a composite electrode are put between a first substrate 1 of a beading jig and a second substrate 4 which is supported at a prescribed position being rectangular to an axis of a core 2 which stands vertically on the first substrate 1 and up and down parts of the composite electrode are in contact with a spacer 10 and the second substrate 4 closely. By this method, both end surfaces of the composite electrode are supported precisely by planes rectangular to the axis of core wire 2 without any influence of the precision of the composing parts. Consequently, concentricity of axes of holes in the interfaces of electrodes and assembling precision e.g. rectangularity of the end surfaces of the composite electrode to the axis of an electron gun is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for assembling an electron gun for a cathode ray tube, which prevents fluctuations in focus characteristics and improves the efficiency of electron gun assembly work.

[Conventional technology]

Hereinafter, an in-line type color cathode ray tube electron gun will be described as an example. An in-line color cathode ray tube electron gun consists of: - an electrode having three electron beam passing apertures arranged in a straight line, and an electrode assembled by laminating a plurality of similar electrode parts (composite electrode) at predetermined intervals; It is constructed with insulation.

Incidentally, the assembly accuracy of the electron gun is determined by the coaxiality of each electron beam passing aperture of each electrode and the perpendicularity between the axis of the electron gun and the end face of each electrode, and influences the fluctuation of the focus characteristics of the color cathode ray tube.

The assembly accuracy of such an electron gun is mainly determined up to the beading process in which a plurality of heat-softened multiform glasses are crimped onto a plurality of electrodes held at predetermined intervals on a jig, or in particular, the assembly accuracy of a plurality of electrode parts. It depends greatly on the accuracy of the laminated Nakaaisho' poles.

Conventionally, composite electrodes were influenced by the end face angles of the constituent electrode parts' f, c (As an assembly method for accurately assembling the perpendicularity of the upper and lower surfaces 1, for example, Japanese Patent Application Laid-Open No. 136134/1983)
(hereinafter referred to as known example 1) is known.

This method involves fitting the components of the composite electrode onto a core metal,
Place it between the upper and lower flat boards perpendicular to the core metal, and
Assemble the composite electrode by laser welding the component parts to each other with the end faces of the parts in close contact with the parallel substrate below.

Next, the composite electrode that has been integrally bonded as described above is removed from the jig described above, and assembled together with a plurality of other electrodes in a beading jig separate from the jig. That is, the composite electrode and the electrodes are fitted onto the core metal of a beading jig, and with a plate-shaped spacer interposed between each electrode to hold each electrode at a predetermined interval, heat is applied to the supporting part of each electrode. A plurality of softened multiform glasses are pressed together. Thereby, each electrode is insulated and supported.

In addition, as another assembly method, JP-A No. 61-22531 (
(hereinafter referred to as known example 2) is known.

This method involves optimizing the cross-sectional shape and dimensions of the core metal of the beading jig, and providing a plane perpendicular to the core metal in the stepped part between the large diameter part and the small diameter part of the core metal, and using this plane to connect the cathode. By holding the inner surfaces of adjacent electrodes perpendicular to the axis of the electron gun and performing beating, errors in displacement of the electron beam are prevented.

[Problem to be solved by the invention]

In the above-mentioned known example, the composite electrode is assembled in advance using an assembly jig, and then assembled together with other electrodes on a beading jig.
It has the following problems. Due to the thermal stress caused by laser welding during composite electrode assembly, the apertures of the electrodes near the laser welding point are slightly deformed, the apertures of the upper and lower electrodes are slightly eccentric, and due to workability, etc. The core metal of the tool needs to be made thinner by about 0.02'ml, which causes deterioration in assembly accuracy of the electron gun. In addition, since the method is a two-step assembly method in which the composite electrode is removed from the assembly jig and then reinserted into the beading jig, it requires many processing steps and is uneconomical.

In the above-mentioned known example 2, the electrode surface is held on a plane perpendicular to the core bar provided in the stepped portion of the large diameter part and the small diameter part of the core bar of the beading jig. If the difference between the small parts is small, the holding strength of the electrode becomes weak, and the electrode surface may be tilted due to stress during beading.

An object of the present invention is to provide an electron gun for a cathode ray tube, which improves the assembly accuracy of the electron gun, such as the coaxiality of the openings between the electrodes and the perpendicularity of the end face of the composite electrode to the electron gun axis, and improves the efficiency of the assembly work. The purpose is to provide an assembly method for the.

[Means to solve the problem]

The above object is achieved by the following assembly method.

First, at least one set of electrodes and spacers are alternately stacked on a core metal provided upright on a first substrate of a beading jig. Thereon, the components of this composite electrode are inserted and placed on the metal core without assembling the composite electrode in advance. Thereafter, a second substrate is placed at a predetermined distance from the first substrate and has a reference plane perpendicular to the core metal. and,
The end surfaces of the upper and lower components of the composite electrode are held in close contact with one side on the spacer and the other side on the second substrate.

In this state, the composite electrode is fixed by laser welding.

Thereafter, the second substrate is removed while leaving the electrodes, spacers, and composite electrode as they are, and other spacers and electrodes are alternately inserted into the core metal, stacked, and pressed from above. In this state, a plurality of heat-softened multiform glasses are pressure-bonded to the support portion of each electrode.

If the electrode to be assembled into the beading jig first is a composite electrode, it is assembled in the following manner. First, a first
The components of this composite electrode are inserted and placed on the core bar without assembling the composite electrode in advance. Thereafter, a third substrate is placed at a predetermined distance from the first substrate and has a reference plane perpendicular to the core metal. Then, the end surfaces of the upper and lower components of the first composite electrode are held in close contact with one side on the first substrate and the other side on the third substrate. In this state, the composite electrode is fixed by laser welding. Thereafter, the third substrate is removed while leaving the first composite electrode as it is, and then the first spacer is stacked on top of the first composite electrode, and the second composite electrode is placed thereon without pre-assembling. It is inserted and placed on the core bar in the same manner as the first composite electrode. Thereafter, a second substrate is placed at a predetermined distance from the first substrate in the same manner as the third substrate. Then, one of the end electrode parts of the second composite electric board is held in close contact with the first spacer, and the other is held in close contact with the second substrate. In this state, the second composite electrode is fixed by laser welding in the same manner as the first composite electrode. Thereafter, the second substrate is removed while leaving the first composite electrode, spacer, and second composite electrode as they are, and other spacers and electrodes are alternately inserted into the core metal, stacked, and pressed from above. In this state, a plurality of heat-softened multiform glasses are pressure-bonded to the support portion of each electrode.

[Effect]

In the case of the first means, electrodes and spacers are placed between the first substrate of the beading jig and the second substrate held at a predetermined position perpendicular to the axis of the cored metal standing upright on the first substrate. and a composite electrode, and the upper and lower components of the composite electrode are brought into close contact with the spacer and the second substrate. In the case of the second means, the first composite electrode is arranged between the first substrate and the third substrate held in a predetermined position perpendicular to the axis of the core bar standing upright on the first substrate. In addition, a second composite electrode is arranged between a spacer on the first composite electrode fixed by welding and a second substrate held in a predetermined position with the first substrate perpendicular to the axis of the core metal. However, the upper and lower components of each composite electrode are accurately held in a plane perpendicular to the axis of the spacer and the third core metal arranged on the first composite electrode.

In addition, since composite electrodes do not weld and fix the constituent electrode parts in advance, there is no deformation of the opening, and the core metal diameter can be made thicker.
The coaxiality of the holes is in the opposite direction. Furthermore, since the composite electrode can be fixed and beaded without having to be inserted or removed, the number of assembly steps is reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG. 1, the substrate 1 of the beading jig
A plurality of core metals 2 are inserted into the holes 1b provided perpendicularly to the upper surface 1a of the metal core 2, and are provided in an upright manner. The core metal 2 is provided with a large diameter portion 2a, a middle diameter portion 2b, and a small diameter portion 2c as required. Therefore, the fourth grid 30 with the support 32 attached to the side surface of the square cup 3J, the spacer 10, the cup 4 which constitutes the third grid 40 which is a composite electrode],
The old joint 4 that has left the joint member 42 and the bottom cup 43
2 flange 42b and 7 langes 43 of the bottom cup 43
Insert the spring 20 between b.

Next, a plurality of support columns 3 whose upper and lower surfaces 3a are precisely machined to be parallel to each other are placed on the upper surface 1a of the substrate 1 at a predetermined height Ll. Subsequently, the plurality of holes 4a provided in the substrate 4 are inserted into the tips of the core bar 2, and the lower surface 4b of the substrate 40 is placed on the upper surface 3a of the support column 3. Thereafter, the substrate 4 is pressed with a push rod 5 to bring the substrate 1, support column 3, and substrate 4 into close contact with each other. This causes spring 2
00 elastic force acts, and this elastic force causes the coupling member 42, cup 4, and spacer which constitute the third grid 40 to
The 0 and 4th grids 30 are biased toward the substrate 1 side, and the bottom cup 43 constituting the third grid 40 is biased toward the substrate 4 side, and the bottom surface 43c of the bottom cup 43 is in close contact with the lower surface 4b of the substrate 4. is retained.

That is, the bottom surface 43c of the bottom cup 43 is held accurately at right angles to the axis of the core metal 2, which is the axis of the electron gun.

At 71, the tip of the cup 410 and the connecting member 4
At the welding point 44, the tip of the flange 42b of No. 2 is connected to the joint hole 4.
2 and the bottom cup 43 are joined from the side at a welding point 45 to fix the third grid 40 of the composite electrode. Then, lift the push rod 5 and remove the board 4, support column 3, and spring 20.

Next, as shown in FIG. 2, a spacer 11 of a predetermined thickness, a second grid 50 . The spacer 12 previously inserts the first grid 60 into the side surface of the cup 61 into the respective openings 11a, 150a, 12a.

61a are fitted onto the core bar 2 and stacked one after another. Next, each electrode is fixed by applying pressure with a push rod 5.

The beating jig holding each electrode in this way was placed on a beading machine (not shown), and
The multiform crow 80 heated to ℃ is shown in the same figure (bl
Press-fit into the supports or flanges of each electrode from the left and right sides to insulate and support each electrode. After beading, the push rod 5 is removed, the beaded electron gun is removed in the axial direction of the core metal 2, and the plate spacer 10.11.1 between the electrodes is removed.
Just take out 2.

3 to 5 show other embodiments of the invention.

Note that the same or equivalent departments as in FIGS. 1 and 2 will be described with the same reference numerals. In the above embodiment, the fourth grid 3
The assembly method in which the fourth grid 30 consists of a single electrode has been shown, but in this embodiment, the fourth grid 30 consists of a coupling member 33 and a cup 34.
The method for assembling the composite electrode is shown below.

First, as shown in FIG. 3, the plurality of openings 33a and 34a of the joint portion 33 and cup 34 of the fourth grid 30, which is a composite electrode, are fitted into the core metal 2 and stacked.

Further, a spring 21 is inserted between the flange portion 33b of the coupling portion phase 33 and the flange portion 34b of the cup 34.

Next, a predetermined number of columns 6, whose upper and lower surfaces 6a are precisely machined to be parallel, are placed on the upper surface 1a of the substrate 1. Subsequently, the plurality of holes 7a provided in the substrate 7 are inserted into the core bar 2, and the elastic force of the overlapping ring 210 acts on the upper surface 6a of the support column 6, and this elastic force causes the joint part constituting the fourth grind 30 to be formed. The flange portion 33b of the moon 33 is on the upper surface 1a of the substrate 1,
The top surface 34c of the cup 34 is held in close contact with the lower surface 7a of the substrate 7, respectively. Therefore, the top surface 34c of the cup 34
is held accurately at right angles to the axis of the core metal 2, which is the axis of the electron gun.

The component parts of the fourth grid 30 held in this way are joined to the fourth grid 30 of the composite electrode by joining the cup 34 and the coupling member 33 from the side at the welding point 35 using a laser beam 72 as shown by the arrow in FIG. to be fixed. Then, lift the push rod 5 and remove the board 7, support column 6, and spring 21.

Since the subsequent operations are the same as those shown in FIGS. 1 and 2, they will be briefly explained. That is, as shown in FIG. 4, the spacer 10, the cup 41 constituting the third grid 40, which is a composite electrode, the coupling member 42, and the bottom 43 are stacked one after another on the fourth grid 30, and then the support 3 is attached to the substrate. 1, and 11 substrates 4 are hung on the support 3. Then press the board 4 with the rod 5
Pressure is applied to bring the substrate 1, support column 3, and substrate 4 into close contact with each other. Next, the cup 41 and the coupling member 42 are coupled at the welding point 44 and the coupling member 42 and the bottom cup 43 are coupled at the welding point 45 using a laser beam 70.7 to fix the third grid 40 of the composite electrode. After that, lift up the push rod 5 and remove the board 4, support column 3, and spring 20.

Next, as shown in FIG. 5, the spacer 11, the second grid 50, the spacer 12, and the first grid 6° are fitted onto the core metal 2 and stacked for the first time. Fix each electrode.

Finally, each electrode is placed on a beading machine, which is a beading jig, holding each electrode as described above, and the heated multiform glass 80 is press-fitted into the support or flange of each electrode. After beating, the push rod 5 is removed to show the beaded electron gun. This embodiment is the same as the embodiment shown in FIGS. 3 to 5 except for the third grid 40. That is, in this embodiment, the coupling member 42 is arranged in the opposite direction, and the cup 41 and the coupling member 42 are welded from the side at the welding point 46, and the 7 flange 42b of the old coupling part 42 is welded from the side.
The third grid 40 of the composite electrode is fixed by joining the tip of the flange portion 43b of the bottom cup 43 at a welding point 47 with a laser beam of 70.7 J.

As is clear from the above description, in the case of the first embodiment, a substrate 1. 4 and welded with laser beam 70.71. In the case of the second and third embodiments, the components of the fourth grid 30 and the third grid 40, which are composite electrodes, are mounted on a substrate 1.7 having a wide reference surface, which is provided on a beading jig in a surface manner or indirectly. .4 and laser beam 72.70.
Weld at 71. Therefore, each electron lens forming surface can be accurately fixed on a surface perpendicular to the axis of the core bar 2, which is the axis of the electron gun.

Further, since the composite electrode is welded and fixed on the beading jig, and only the composite electrode is inserted and removed, the core metal 2 of the beading jig can be made approximately 0.02 mm thicker than before. This improves the degree of coaxiality between the openings. Further, since there is no need to insert or remove the composite electrode 30.4o, the efficiency of the electron gun assembly work is improved.

Note that the connecting members 33, 42 of the fourth grid 30 and the third grid 4° are not limited to the shapes shown in the embodiments, but may be a plurality of connecting members or plate-shaped members. Further, in the third grid 40, the cup 41 or the bottom cup 4
The tongue piece provided in 3 may also be used. In addition, if the parallelism of each of the cup 41 and the bottom cup 43 is not extremely bad, by optimizing the length of each, the coupling member 4
2 can also be omitted.

In addition to the composite electrode fixed by welding, a spacer and an electrode or a composite electrode assembled and fixed may be arranged between the substrates of the beading jig or between the spacer and the substrate.

In the above embodiment, three core metals 2 were used, but two core metals inserted into the openings on both sides of the electrode may also be used. A single core metal may also be used.

Further, in a multi-stage focusing electron gun or the like having a large number of electrodes, three or more composite electrodes may be assembled on a beading jig.

〔Effect of the invention〕

According to the present invention, by welding and fixing the composite electrodes constituting the electron gun on a beading jig, the end surfaces of the electrodes that face each other and form the electron lens can be aligned with a plane orthogonal to the axis of the electron gun. I can do it. Furthermore, since the displacement error of the electron beam is reduced by improving the coaxiality of the electrode apertures, a cathode ray tube with uniform quality and less variation in focus characteristics can be obtained. Furthermore, since the number of insertions and removals of composite electrodes is reduced, the efficiency of electron gun assembly work is improved.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 shows the composite electrode in an assembled state, (a) is a front cross-sectional view, (a) is a side cross-sectional view, and FIG. 2 is a beading state. (a) is a front sectional view, (b) is a side sectional view, FIGS. 3 to 5 show other embodiments of the present invention, and FIG. 3 shows the assembled state of the first composite electrode, (a) is a front sectional view, a) is a side sectional view, Fig. 4 is an assembled state of the second composite electrode, (a) is a front sectional view, a) is a side sectional view, and Fig. 5 is a beading (a) is a front sectional view, (b) is a side sectional view, FIGS. 6 and 7 show still other embodiments of the present invention, and FIG. 6 shows the assembled state of the second composite electrode. (ai is a front sectional view, (bl is a side sectional view, FIG. 7 is a beading state, (a) is a front sectional view,
(b) is a side sectional view. DESCRIPTION OF SYMBOLS 1... Board, 2... Core metal, 3... Support column, 4... Board, 5... Push rod, 6...
...Strut, 7...Substrate, ]0, Jl, 12...
・Spacer, 20.2] Spring, 30
... Fourth grid, 33... Connecting member, 34.
- Cup, 35... Welding point, 40... Third grid, 41... Cup, 42... Connecting member,
43...Bottom cup, 44,45...Welding point,
50...Second grid, 70. 71.72...Rheome glass. 60...1st Grid, The Light, 80...Multifu 2nd (a) (b) 1: Makuhan 2: Fanzur 5: 1 o to 12: Human pacer 30: 47th '°18th V゛4o: 50: 6o: 8o: 3rd'7'''HasoV゛27th' Lid 11 Field 1 Rutif - 4 Force Figure 5 (b) 1: Base Status 2 - Payment 5 2 ↑ ↑; F. 60; 17th inch reset °. 8o: Ma ν laser 7 ohm curve ° ° Las Fig. 6 (b) Base, 1 reaction, Kinshi No. 1, $ 1 - Anti-Jukou L Suena spacer splint 7 “ 49th Pari R゛ 37th Ritz V' Power/Soft. Extra unit 4i sound β 14 years old, Pathumkaff 0 wo Ryougaku, sail racer 7th point (b) 1: Violence 2: Shinkin 5-1 Koshimoto 1o-12 Ni spacer 3o: 47th °' Hibiki hat 40: 5o: 6o: 8o: Tate 3, 7...So, 7F $2 Lid.

Claims (1)

[Claims] 1. At least one set of electrodes and spacers are fitted to a core bar provided upright on a first substrate and stacked alternately;
Next, two end electrode parts constituting a composite electrode and, if necessary, a required number of connecting parts between the end electrode parts are placed on top of the metal core, and then the first A second board having a reference plane perpendicular to the core bar is arranged at a predetermined distance from the board, and one of the end electrode parts is brought into close contact with the spacer and the other part is brought into close contact with the second board. , then 2
The composite electrode is fixed by laser welding between the two end electrode parts or between the end electrode parts and the joining parts, and then the second
Next, spacers and electrodes are alternately placed and pressed onto the core bar, and in this state, a plurality of heat-softened multi-form glasses are crimped onto the supporting part of each electrode to form each electrode. A method for assembling an electron gun for a cathode ray tube, characterized in that the electron gun is insulated and supported. 2. Fit the two end electrode parts constituting the first composite electrode to the core metal provided upright on the first substrate, and the required number of coupling parts between the end electrode parts as necessary. and placed on the first substrate, and then at a predetermined distance from the first substrate,
and a third substrate having a reference plane perpendicular to the core bar, one of the end electrode parts is brought into close contact with the first board and the other with the third board, and then two The first composite electrode is fixed by laser welding the end electrode parts or between the end electrode parts and the coupling parts, and then the third substrate is removed, and then the first composite electrode is welded onto the first composite electrode. 1 spacer is stacked on top of the first spacer, and the components constituting the second composite electrode are placed on top of it in the same manner as the first composite electrode, and then the first
A second substrate is arranged at a predetermined distance from the substrate in the same way as the third substrate, and one of the end electrode parts of the second composite electrode is placed on the first spacer, and the other is placed on the second substrate. The second composite electrode is fixed by laser welding in the same manner as the first composite electrode, and then the second composite electrode is removed.
Next, spacers and electrodes are alternately placed and pressed on the core metal, and in this state, a plurality of heat-softened multi-form glasses are crimped to the support portion of each electrode to insulate and support each electrode. A method for assembling an electron gun for a cathode ray tube, characterized by: