KR0137263B1 - Image display apparatus and manufacturing method therefor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel image display device using an electron beam, in particular, wherein the electron beam control electrode is not laminated, but has a problem such as "curvature" and "squeezing", and is laminated with a rigidity as a structure. The object of the present invention is to provide a fixing structure and a method thereof, and in the configuration, at least, the face plate 1 on which the phosphor screen 3 is formed, the electron beam passing holes 6a-1, and 6- b-1), (6-c-1), (6-d-1), and a plurality of electron beam control electrodes (6-a), (6-b), (6- A flat panel image display device comprising: an electrode unit 6 having a stack of 6-c), (6-d), and (6-e) fixed thereto, an electron source, and a container holding the inside under vacuum; The stacking and fixing structure of the electron beam control electrodes constituting the unit 6 is formed in the insulating spacer 10-a formed between the electron beam through holes of the N-th electron beam control electrode and the N-th electron beam control electrode. Anchor holes formed in the (N + 1) th electron beam control electrode corresponding to the position of the formed insulation spacer, and the Nth and Nth electron beam control electrodes through the insulation spacer, After the lamination, at least the anchor hole is covered with each other to form a thermal sprayed film 10-b, 10-c, 10-d, and 10-e, and a manufacturing method thereof. To provide.

Description

Image Display Device and Manufacturing Method of Image Display Device

1 is a cross-sectional view showing main parts of an example of an electrode unit according to a first embodiment of the present invention.

2 is a perspective view showing main parts of an example of an electrode unit in a manufacturing process according to a first embodiment of the present invention;

3 is a cross-sectional view showing main parts of an image display apparatus using an example of an electrode unit according to a first embodiment of the present invention.

4 is a cross sectional view showing an essential part of the first example in which a thermal spraying film is selectively formed only around the anchor hole;

5 is a cross sectional view showing a main part of a second example in which a thermal spray coating is selectively formed only around the anchor hole;

6 is a cross-sectional view showing main parts of an electrode module according to a second embodiment of the present invention.

7 is a cross-sectional view showing main parts of an electrode unit according to a second embodiment of the present invention.

8 is a cross-sectional view showing a main part of an image display apparatus using an electrode unit according to a second embodiment of the present invention.

9 is a sectional view showing the main part of a first example of a conventional electrode unit;

10 is a perspective view showing main parts of a first example of a conventional electrode unit

11 is a sectional view showing the main part of a second example of an image display apparatus using a conventional electrode unit.

12 is a sectional view showing the main part of a first example of an image display apparatus using a conventional electrode unit;

Fig. 13 is a sectional view showing the main part of a second example of an image display apparatus using a conventional electrode unit;

* Explanation of symbols for main parts of the drawings

(6): electrode unit

(6-a), (6-b), (6-c), (6-d), (6-e): electron beam control electrode

(6-a-1), (6-b-1), (6-c-1), (6-d-1), (6-e-1): electron beam through hole

(6-a-2), (6-b-2), (6-c-2), (6-d-2), (6-e-2): anchor hole

(10-a): Insulation spacer

(10-b), (10-c), (10-d), (10-e): thermal sprayed coating

The present invention particularly relates to a flat panel image display device using an electron beam.

Hereinafter, an example of the structure of the conventional image display apparatus is demonstrated, referring drawings.

9 shows a cross section of the main part of the first example of the conventional electrode unit. 10 shows a perspective view of an essential part of an example of a conventional electrode unit. 11 shows a cross sectional view of an essential part of an example of an image display apparatus using a conventional electrode unit. In FIG. 11, reference numeral 101 denotes a face plate which also serves as a surface container coated with a phosphor screen 103 made of R, G, and B on its inner surface, and 102 denotes a back electrode 104 made of a conductive film on its inner surface. ) Is a backside container, 105 is a linear phase cathode, and 106 is an electron beam control electrode 106a, 106b, 106c. (In this conventional example, shown to 106e), it is an electrode unit formed by laminating | stacking. In the image display apparatus, the electron beam generated from the shaped image cathode 105 includes electron beam control electrodes 106a, 106b, 106c,. Electron beam through holes 106-a-1, 106-b-1 formed in the trenches; The control of connection, deflection, modulation, etc. is performed during the passage, and then the image is displayed by colliding and emitting light on the phosphor screen 103 of R, G, and B.

Here, the electron beam control electrodes 106a, 106b, 106c,... Of the electrode unit 106. As a method of laminating and fixing each other, as shown in FIG. 12 (a), the glass rod 110 is used as a core, and the frit glass 111 is coated around it in FIG. 12 (b). As shown, the frit is disposed between the electron beam passing holes 106-a-1 and between the electron beam passing holes 106-b-1, and is pressurized and ions as shown in FIG. 12C. Is dissolved and bonded. Here, electron beam control electrodes 106a, 106b, 106c,... The diameters of the glass rods 110 are maintained.

The electrode unit 106 produced as described above is supported and fixed at the peripheral portion by a post 108 bonded and fixed to the back container 102 by the frit glass 107.

13 shows a cross section of the main part of the second example of the conventional electrode unit.

Electron beam control electrodes 106a, 106b, 106c,... The lamination / fixing method of the present conventional example (shown up to 106e) includes electron beam control electrodes 106a, 106b, 106c,... The insulating spacers 120a, 120b, 120c, 120d, and 120e, for example, made of ceramics are disposed to maintain the gap therebetween, and in this state, the electron beam control electrode 106a is disposed. It is fastened by the fastening pin 120 joined to. Specifically, the distal end of the fastening pin 121 is reliably tightened by melting with a laser beam, for example.

Here, electron beam control electrodes 106a, 106b, 106c,... Is a planar shape, and thus the fastening pins 121 are also arranged at appropriate intervals in two dimensions. Then, the fastening pin portion 121 discretely stacks and fixes the electron beam control electrodes 106a, 106b, 106c, 106d, and 106e.

However, with the method as described above, there was a problem as described below.

First, in the first example, in order to bond the electron beam control electrodes, it is necessary to raise the temperature to the melting temperature of the frit glass. Therefore, after joining in a state of thermal expansion, it is cooled to room temperature. However, in this process, "warpage" often occurs, and thus, the finished electrode unit is often warped greatly. In addition, in the step of melting the frit, an electric furnace capable of precisely controlling the temperature profile has to be used, and thus there is a problem that the cost is increased and the efficiency of the system is lowered.

In addition, in the second example, since the electron beam control electrode is fastened by the structure using the fin, "warping" caused by thermal expansion as in the first example does not occur. However, in this configuration, the electron beam control electrodes 106a, 106b, 106c,... Except for the fastening pin portion. Since there is no member for regulating the lamination interval of, there has been a problem that "squiggle" occurs corresponding to the position where the fastening pin is arranged. In addition, the rigidity as a structure of the electrode unit becomes considerably low, and as a result, it was not possible to maintain the shape and install it in the configuration of fixing only the periphery as a fixing method.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a structure and a method of stacking and fixing an electron beam control electrode in a state of overcoming the problems of "bending" and "inverting" and securing rigidity as a structure. do.

In order to solve the above problems, the electron source of the present invention is as follows.

According to a first aspect of the present invention, there is provided a face plate on which a phosphor screen is formed, an electrode unit in which a plurality of electron beam control electrodes having an electron beam through hole are stacked and fixed, an electron source, and a container for keeping a vacuum inside. In one flat panel image display device, the lamination and fixing arrangement of the electron beam control electrodes constituting the electrode unit includes an insulating spacer formed between the electron beam through holes of the Nth electron beam control electrode, and the Nth electron beam control. Anchor holes formed in the (N + 1) th electron beam control electrode and the Nth and Nth (N + 1) th electron beam control electrodes corresponding to the positions of the insulating spacers formed on the electrodes are formed in the insulating spacer. The present invention provides an image display apparatus comprising a thermal spraying film formed by interposing at least the anchor hole after lamination.

According to a second aspect of the present invention, there is provided an electrode unit formed by arranging a face plate on which a phosphor screen is formed, and an electrode module, in which a plurality of electron beam control electrodes are stacked and fixed at predetermined intervals, and an electron source and an inside under vacuum. A flat panel image display device having at least a container, wherein the stacking and fixing arrangement of the electron beam control electrodes constituting the electrode module comprises: an insulating spacer having an Nth electron beam control electrode formed at least approximately at the center thereof; A thermally sprayed film formed by stacking (N + 1) th electron beam control electrodes through the insulating spacers and covering at least the anchor holes, corresponding to the positions of the insulating spacers formed on the electron beam control electrodes Provided is an image display device comprising: a.

According to a third aspect of the present invention, there is provided a manufacturing method of an image display apparatus including at least a step of manufacturing an electrode unit formed by stacking and fixing a plurality of electron beam control electrodes. Forming an insulating spacer between the electron beam passing holes of the N-th electron beam control electrode having a hole, and an (N + 1) th electron beam control electrode having an anchor hole corresponding to the position of the insulating spacer; A method of manufacturing an image display apparatus comprising the step of laminating to the N-th electron beam control electrode via the insulating spacer, and the step of forming a sprayed film so as to cover the anchor hole.

According to a fourth aspect of the present invention, there is provided a method of manufacturing an image display apparatus, the method comprising: manufacturing an electrode module formed by stacking and fixing a plurality of electron beam control electrodes; and arranging the modules at predetermined intervals. The manufacturing step of the electrode module includes the steps of forming an insulating spacer in at least substantially the center of the N-th electron beam control electrode, and the (N + 1) -th sheet having an anchor hole corresponding to the position of the insulating spacer. Laminating an electron beam control electrode to the Nth electron beam control electrode via the insulating spacer; and forming a thermal spraying film to cover the anchor hole. A manufacturing method of an image display apparatus is provided.

The action by the above configuration is as follows.

According to the first aspect of the present invention, there is provided a structure in which a plurality of electron beam control electrodes are stacked and fixed as an electrode unit for driving an electron beam or the like by a flat panel image display device. The electrode unit comprising the N-th electron beam control electrode and the (N + 1) -th electron beam control electrode forms a thermal spray film so as to cover the (N + 1) -th anchor hole, and the thermal spray film passes through the anchor hole. It has a structure laminated and fixed by fusion with an insulating spacer formed on the N-th electron beam control electrode. At the same time, the thermal sprayed coating formed on the (N + 1) th electron beam control electrode becomes an insulating spacer for laminating and fixing the (N + 2) th electron beam control electrode. By repetition of this structure, a plurality of electron beam control electrodes are stacked and fixed to form an electrode unit.

According to this structure, the thermal sprayed coating which is the joining means of the electron beam control electrode can be formed at a considerably lower temperature than frit glass or the like, and therefore, deformation due to thermal expansion does not occur when laminating and fixing the electron beam control electrode. At the same time, the present invention can also be used as a reference plane for stacking and fixing the following electron beam control electrodes, which is advantageous in terms of cost.

In addition, by appropriately setting the joining area, that is, the size of the anchor hole, rigidity as an appropriate structure can be ensured.

According to the second aspect of the present invention, there is provided an electrode unit for driving an electron beam or the like by a flat panel image display device, wherein a plurality of electrode modules having a structure in which a plurality of electron beam control electrodes are stacked and fixed are arranged at predetermined intervals. Has

In addition to the operation of the present invention according to the first aspect, it is modularized in order to reduce the influence on the precision of the electrode (time change such as initial processing precision and thermal deformation) which is a problem, especially when large screen.

The present invention according to the third aspect is a manufacturing method for stacking and fixing a plurality of electron beam control electrodes as an electrode unit for driving an electron beam or the like by a flat panel image display device. The electrode unit comprising the N-th electron beam control electrode and the (N + 1) -th electron beam control electrode is formed by passing through the anchor hole and being the N-th sheet by a thermal spray film formed so as to cover the (N + 1) -th anchor hole. The lamination and fixing are performed by joining with an insulating spacer formed on the electron beam control electrode. At the same time, the thermal sprayed coating formed on the (N + 1) th electron beam control electrode becomes an insulating spacer for laminating and fixing the (N + 2) th electron beam control electrode. By repeating this process, a plurality of electron beam control electrodes are laminated and fixed to form an electrode unit.

According to this method, the thermal sprayed coating which is the joining means of the electron beam control electrode can be formed at a considerably lower temperature than the frit glass or the like, and therefore, deformation due to thermal expansion does not occur when laminating and fixing the electron beam control electrode. At the same time, a reference plane for stacking and fixing the following electron beam control electrodes can also be formed, which is advantageous in terms of cost.

In addition, by appropriately setting the bonding area, that is, the size of the anchor hole, rigidity as an appropriate structure can be ensured.

According to the fourth aspect of the present invention, there is provided an electrode unit for driving an electron beam or the like by a flat panel image display device, the structure comprising a plurality of electrode modules having a structure in which a plurality of electron beam control electrodes are stacked and fixed at a predetermined interval. It is a manufacturing method for.

The action by the above configuration is the same as that of the present invention according to the third aspect.

EMBODIMENT OF THE INVENTION Hereinafter, the image display apparatus which concerns on one Embodiment of this invention, and its manufacturing method are demonstrated, referring drawings.

1 is a cross-sectional view of an essential part of an example of an electrode unit according to a first embodiment of the present invention. 2 is a perspective view of principal parts of an example of an electrode unit in the manufacturing process according to the first embodiment of the present invention. 3 is a cross-sectional view of an essential part of an example of an image display apparatus using an example of an electrode unit according to a first embodiment of the present invention. In Fig. 3, reference numeral 1 denotes a face plate which also serves as a surface container coated with a phosphor screen 3 made of R, G, and B on the inner surface, and (2) a back electrode 4 formed of a conductive film on the inner surface. It is a backing container formed. (5) is a linear cathode, (6) electron beam control electrodes 6a, 6b, 6c, 6c,. (In this embodiment, shown to (6-e)), the electrode unit is formed by stacking. In the image display apparatus, the electron beams generated from the linear cathodes 5 are the electron beam control electrodes 6a, 6b, 6c, 6c,. Electron beam through holes formed in the holes 6-a-1, 6-b-1,... While passing through the control panel, control of connection, deflection, modulation, and the like is performed, and then image display is caused by colliding and emitting light on the phosphor screen 3 of R, G, and B.

The electrode unit 6 is supported and fixed at the periphery by the post 8 bonded and fixed to the back container 2 by the frit glass 7.

Herein, electron beam control electrodes 6a, 6b, 6c, ... of the electrode unit 6. The structure and method of lamination and fixation will be described.

First, with respect to the insulating film 10-a formed by a predetermined method between the electron beam through holes 6a-1 of the first electron beam control electrode 6a, the anchor hole 6b is positioned at that position. The second electron beam control electrode 6-b having the -2) formed thereon is laminated, and the thermal sprayed film 10-b is formed so as to cover the anchor hole 6-b-2, and the thermal sprayed film 10 -b is fused with the insulating film 10-a through the anchor hole 6b-2, so that the first electron beam control electrode 6a and the second electron beam control electrode 6b are fixed. do. At the same time, the thermal sprayed film 10-b serves as a reference plane for stacking and fixing the third electron beam control electrode 6-c. The reason why the thermal spray film is used as the film for performing the above-mentioned adhesion action is that the method using the thermal spray film for forming the insulating film 10-a may be advantageous without incurring the complexity of the process. It doesn't happen.

Electron beam control electrodes 6-c, 6-d, 6-e after the third sheet; What is necessary is just to perform said repetition as a structure and manufacturing method of lamination | stacking and fixing (it shows to (6-e) in this Example).

According to this structure, the thermal sprayed coating which is the joining means of the electron beam control electrode can be formed at a considerably lower temperature than the frit glass or the like, and therefore, deformation due to thermal expansion does not occur when the electron beam control electrode is laminated and fixed. At the same time, it can also be used as a reference plane for stacking and fixing the following electron beam control electrodes, which is advantageous in terms of the number of steps and the cost. In addition, by appropriately setting the joining area, that is, the size of the anchor hole, it is possible to ensure appropriate rigidity as a structure. The shape of the anchor hole is not limited to the round hole shape as shown in Fig. 2, but may be a suitable shape such as a slit shape. However, the size is not to be larger than the ground plane of the insulation spacer, which is a standard for lamination. For this reason, it is difficult to form a thermal sprayed coating so as to cover the anchor hole when the anchor hole is larger than the ground plane of the insulating spacer, which is a reference for stacking. Also, when the thermal sprayed film is formed, the thermal sprayed material is scattered between the electrodes. This is because there is a possibility that a problem arises, and the performance as an electrode unit may be impaired.

For the same reason as described above, as a method of selectively forming the thermal spray coating only around the anchor hole when forming the thermal spray coating so as to cover the anchor hole, the formation of the thermal spray coating according to the surface roughness of one base is used. That is, as shown in FIG. 4, the anchor holes 6b-2, 6c-2,. Area roughened selectively around (6-a-3), (6-b-3),... In this state, the electron beam passing holes 6-a-1, 6-b-1,... There is a method in which the thermal spraying is avoided to prevent the sprayed particles from scattering between the stacked electron beam control electrodes and to form a thermal sprayed coating only in the roughened area of the hole.

According to this method, although the apparatus is simple, there is a possibility that the state of the accuracy such as the thermal sprayed coating is slightly worsened.

As one method, as shown in FIG. 5, the mask 20 is used. According to this method, the anchor holes 6-b-2, (6-c-2),... The thermal sprayed coatings 10-b, 10-c formed on the substrate, and the like; The shape of is obtained more precisely than in the method of FIG. 4, and as a result, the electron beam control electrode can be laminated with high precision.

It is preferable that the mask 20 can be used again as many times as possible, and in order to do so, the thermal spray film should not adhere to the mask itself. As such a mask, for example, there is a mask in which a surface is mirror-finished.

Further, anchor holes 6-b-2, 6-c-2,... The sprayed film 10-e formed on the outermost side of the electrode unit 6 among the sprayed films over which the film is covered with, for example, an electron beam passing hole 6-a-1, (6- b-1),... … Charge-up or the like may occur due to the leakage electrons or the like of the electron beam passing through (6-e-1), which may affect the electron beam trajectory. In such a case, a conductive material may be used as the material of the thermal sprayed film 10-e. The thermal spraying film 10-e is formed of a conductive material so that insulation between the electron beam control electrodes 10-d and 10-e is maintained in structure.

In addition, according to the present invention, in order to more reliably solve the problem caused by thermal expansion, the electron beam control electrodes 6a, 6b, 6c, 6c,. The material of (6-e) is made of an inert material (36Ni alloy), which is a low-expansion metal material, and at the same time, a spraying process is performed while cooling the electron beam control electrode substrate while at least anchor holes are covered. do.

According to this method, the thermal expansion of the electron beam control electrode can be minimized by the synergistic effect of using a material having a small coefficient of thermal expansion and suppressing the temperature rise by cooling, thereby forming a bonding process by forming a thermal sprayed coating. It is possible to more reliably prevent the bending due to the difference in thermal expansion during and after. In particular, the inver material exhibits low thermal expansion characteristics in the temperature range of about 200 ° C from room temperature to about 200 ° C, so that the substrate (electron beam control electrode covering the anchor hole) is preferably cooled to 200 ° C or lower.

In addition, as shown in Fig. 5, the method of thermal spraying around the anchor hole by the mask also has the effect of blocking radiant heat from the thermal spray torch by the mask, which is further effective in solving the problem caused by heat. .

6 is a sectional view of an essential part of an example of an electrode module according to a second embodiment of the present invention. 7 is a sectional view of principal parts of an example of the electrode unit according to the second embodiment of the present invention. 8 is a sectional view of an essential part of an image display apparatus using an example of an electrode unit according to a second embodiment of the present invention. Components having the same operation as those in the first embodiment are assigned the same numbers.

This configuration is a plurality of electron beam control electrodes 6a, 6b, 6c, and the like as an electrode unit 6 for driving an electron beam. The plurality of electrode modules 6 having the laminated and fixed structure are arranged at predetermined intervals P. FIG. Then, the gap between the modules becomes an electron beam passing gap, and performs the same operation as the electron beam passing hole in the first embodiment.

By modularizing the electrode unit, it is possible to reduce the influence on the precision of the electrode (time change such as initial processing accuracy and thermal deformation) which is a problem, especially when it is a large screen.

In this hole, the structure and manufacturing method of the electrode module are the same as in the first embodiment, and the specific configurations, shapes, materials, and the like regarding the insulation spacer, the anchor hole, and the like are the same as in the first embodiment.

As described above, the present invention uses a thermal spray film as a spacer for bonding the electron beam control electrode and stacking the next electron beam control electrode, and can be formed at a considerably lower temperature than frit glass and the like, and stacking and fixing the electron beam control electrode. No deformation occurs due to thermal expansion of the city.

Moreover, the electrode unit joined in this way can ensure rigidity as a structure.

Claims (18)

A face plate on which a phosphor screen is formed; An electrode unit in which a plurality of electron beam control electrodes having electron beam passage holes are stacked and fixed; An electron source; In a flat panel image display device having at least a container for keeping the interior vacuum, the stacking and fixing arrangement of electron beam through holes constituting the electrode unit is insulated between the electron beam through holes of the Nth electron beam control electrode. A spacer; An anchor hole formed in the (N + 1) th electron beam control electrode corresponding to the position of the insulating spacer formed on the Nth electron beam control electrode; And the thermal spraying film formed by stacking the N-th and the (N + 1) th electron beam control electrodes via the insulating spacer, and then covering at least the anchor hole. An image display device. A face plate on which a phosphor screen is formed; An electrode unit formed by stacking and fixing a plurality of electron beam control electrodes at predetermined intervals; An electron source; In a flat panel image display device having at least a container for keeping the interior vacuum, the stacking / fixing configuration of the electron beam control electrodes constituting the electrode module includes an insulating spacer formed at least in the center of the Nth electron beam control electrode. Wow; An anchor hole formed in the (N + 1) th electron beam control electrode corresponding to the position of the insulating spacer formed on the Nth electron beam control electrode; The N-th and the (N + 1) -th electron beam control electrodes, which are formed by laminating the insulating spacers therebetween and formed by spraying at least the anchor hole to form a thermal spraying film. . 2. An image display apparatus according to claim 1, wherein the size of the anchor hole is smaller than the ground plane with the insulating spacer formed on the Nth electron beam control electrode. A manufacturing method of an image display apparatus comprising at least a step of manufacturing an electrode unit formed by stacking and fixing a plurality of electron beam control electrodes, wherein the manufacturing step of the electrode unit is the N-th sheet electron beam control having an electron beam through hole. Forming an insulating spacer between the electron beam passing holes of the electrode; Laminating the (N + 1) th electron beam control electrode having the anchor hole corresponding to the position of the insulation spacer to the Nth electron beam control electrode via the insulation spacer; And forming a thermal sprayed coating so as to cover said anchor hole. Manufacturing an electrode module formed by stacking and fixing a plurality of electron beam control electrodes; A manufacturing method of an image display apparatus comprising at least a step of arranging the electrode modules at predetermined intervals, wherein the manufacturing step of the electrode module is a step of forming an insulating spacer on at least approximately the center of the Nth electron beam control electrode. and; Laminating the (N + 1) th electron beam control electrode having an anchor hole corresponding to the position of the insulation spacer to the Nth electron beam control electrode via the insulation spacer; And forming a thermal sprayed coating so as to cover said anchor hole. The image display apparatus according to claim 1, wherein the thermal spraying coating covering the anchor hole formed in the electron beam control electrode constituting the outermost part of the electrode unit is formed of a conductive material. A plurality of electron beam control electrodes are formed of an inver material (36Ni alloy), and the thermal sprayed film is formed by thermally spraying at least the (N + 1) th electron beam control electrode while spraying. An image display device. The image display apparatus according to any one of claims 1, 6, and 7, wherein the thermal spraying film is formed after forming a mask in an area except for the region where the thermal spraying film is to be formed. 3. An image display apparatus according to claim 2, wherein the size of the anchor hole is smaller than the ground plane with the insulating spacer formed on the Nth electron beam control electrode. 3. An image display apparatus according to claim 2, wherein the thermal sprayed coating covering the anchor hole formed in the electron beam control electrode constituting the outermost part of the electrode unit is formed of a conductive material. 3. The plurality of electron beam control electrodes are formed of an inver material (36Ni alloy), and the thermal sprayed film is formed by thermally spraying at least the (N + 1) th electron beam control electrode while spraying. An image display device. 5. An image display apparatus according to claim 4, wherein the thermal spraying film covering the anchor hole formed in the electron beam control electrode constituting the outermost part of the electrode unit is formed of a conductive material. A plurality of electron beam control electrodes are formed of an inver material (36Ni alloy), and the thermal sprayed film is formed by thermally spraying at least the (N + 1) th electron beam control electrode while spraying. An image display device. 6. The plurality of electron beam control electrodes are made of an inver material (36Ni alloy), and the thermal sprayed coating covering the anchor hole formed in the electron beam control electrode constituting the outermost part of the electrode unit is formed of a conductive material. An image display apparatus. 6. The image display apparatus according to claim 5, wherein the thermal sprayed coating is formed by thermally spraying at least the (N + 1) th electron beam control electrode while thermally spraying. 12. The image display apparatus according to any one of claims 2, 10, and 11, wherein the thermal sprayed coating is formed after forming a mask in a region other than the region in which the thermal spraying coating is to be formed. The manufacturing method of an image display apparatus according to any one of claims 4, 12, and 13, wherein the thermal sprayed coating is formed after forming a mask in a region other than a region in which the thermal spraying coating is to be formed. The manufacturing method of an image display apparatus according to any one of claims 5, 14, and 15, wherein the thermal spraying film is formed after forming a mask in a region other than a region in which the thermal spraying film is to be formed.