JPH10134712A - Manufacture of electron gun cathode structural body and electron gun cathode structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method whereby a cathode structural body of an electron gun can be manufactured by a simple process. SOLUTION: A first grid 7 and a pawl 7 in a spacer 6 are provided, a recessed part for inserting the pawl is provided in an insulator 8. On a surface of a jig, the first grid 7 is mounted with the pawl facing upward, also on this surface, the spacer 6 is mounted by making the pawl face upward. On the first grid 7 and the spacer 6, while inserting the pawl in the recessed part, the insulator 8 is mounted. By a jig 5c, while pressing the insulator 8 to a side of the spacer 6, and by a jig 5d, while pressing the first grid 7 to a side of a jig 5, the first grid 7 spacer 6 and the insulator 8 are secured by a jig with glass in a contact location of the pawl and the recessed part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun in which a spacer for defining a distance between first and second grids and the first grid are fixed to an insulator for supporting them. The present invention relates to a method for manufacturing a cathode structure to be used, and particularly to a method for simplifying a manufacturing process.

[0002]

2. Description of the Related Art In an electron gun mounted on a CRT display for a television receiver or a computer terminal, a distance between a cathode and a first grid and a distance between a first grid and a second grid are controlled in order to suppress variations in cutoff voltage. It is required to define the distance between grids with high accuracy.

In order to precisely define the distance between the first and second grids, a plurality of grids except the first grid are arranged and supported at a predetermined interval on a pair of glass support rods. A spacer defining the distance between the second grids and the first grid are fixed to an insulator for supporting them, and an electron gun in which the first grid is directly attached to the second grid via the spacer has already been provided. The application has been filed (Patent Application Publication No. JP-A-5-36360).

According to the electron gun of this application, since the first grid is directly attached to the second grid via the spacer, the influence of heat, pressure and the like during the beating by the glass support rod is reduced. Less than. Therefore, it is possible to prevent the distance accuracy from being deteriorated due to the deformation of the first grid during the beating as in the related art. Moreover, since the first grid is directly attached to the second grid via the spacer in a state where the spacer and the first grid are fixed on the same insulator, there is no need to remove the spacer after beating. Therefore, the distance between the first and second grids is precisely defined by the spacer.

As described above, since the electron gun according to the present application is very useful for defining the distance with high accuracy, a method of manufacturing a cathode structure used in the electron gun has been conventionally proposed. (Patent Application Publication No. JP-A-5-166457).

As shown in FIG. 6, a spacer 2 for defining the distance d12 between the first and second grids and the first grid 3 are fixed to the same plane 4a of the insulator 4. In the manufacturing method of the electron gun cathode assembly described above, the step between the first and second surfaces 1a and 1b is the distance d1.
Preparing a brazing jig 1 equal to 2;
a mounting the first grid 3 on the second surface 1b
A step of mounting the spacer 2 on the first grid 3 and the step of mounting the insulator 4 on the first grid 3 and the spacer 2 so that the upper surface thereof and the plane 4a are in surface contact with each other; Fixing the first grid 3 and the spacer 2 to the insulator 4 while pressing the jig 1 toward the jig 1.

According to this manufacturing method, either the portion where the insulator 4 is fixed to the first grid 3 or the portion where the insulator 4 is fixed to the spacer 2 plays a role of buffering. The first and second surfaces 1a,
The distance d12 between the first and second grids due to the step of 1b
Can be defined with high accuracy.

[0008]

By the way, in this conventional manufacturing method, it is premised that the first grid 3 and the spacer 2 are fixed to the insulator 4 between their upper surfaces and the plane 4a. Therefore, as an actual fixing method, brazing suitable for fixing between such surfaces has been adopted.

[0009] However, when brazing is performed, many steps are required for the subsequent processing. FIG. 7 is a system diagram showing the whole manufacturing process of the cathode structure when the first grid and the spacer are fixed to the insulator by brazing.

The first of P1 and P2 is a step of manufacturing an insulator by pressing and firing ceramic powder. Subsequent P3 to P12 are steps of the brazing lower processing. That is, P3 is a polishing step for polishing the surface of the insulator to unify its thickness and flatness within a certain range.
P6 is a step of printing a metal layer (for example, an alloy layer of molybdenum and manganese) on the surface of the insulator and drying and firing the surface; P7 to P8 are barrel polishing steps for thickness reduction and surface finishing; and P9 is a brazing material. As a prerequisite for printing, a step of plating the surface of the insulator (for example, plating with a compound of nickel and boron), and P10 to P12 are steps of printing a brazing material on the surface of the insulator, drying and firing the surface. .

After the completion of the preparation, a barrel polishing step P13 for finishing the surface of the insulator and a first grid (G
1), a step P14 of setting the spacer and the sleeve holder to the insulator, a step P15 of brazing and firing, a step P16 of inserting the sleeve to which the oxide has been absorbed into the sleeve holder and fixing it by welding, and a second grid. (G2) is fixed to the spacer by welding, a step P18 for beading the third and subsequent grids, a step P19 for attaching a heater by welding, and a connecting line step P20, and the electron gun cathode assembly Is completed.

As described above, in the conventional method for manufacturing a cathode structure, many steps are required as a pretreatment for brazing, which has led to a complicated, long-time, and high-cost manufacturing operation.

The present invention has been made in view of the above points, and a spacer for defining the distance between the first and second grids and the first grid are fixed to an insulator for supporting them. It is an object of the present invention to provide a method capable of manufacturing the cathode structure of the electron gun in a simple process.

[0014]

According to a method of manufacturing an electron gun cathode assembly according to the present invention, a spacer for defining a distance between a first grid and a second grid and the first grid support the spacers. The method for manufacturing a cathode structure of an electron gun fixed to an insulator is characterized in that the first grid and the spacer are fixed to the insulator by attaching glass.

According to this manufacturing method, the first grid and the spacer are fixed to the insulator by attaching the glass. However, when the attaching is performed with the glass, the metal layer required for the brazing is required. Printing and firing and brazing material printing
It eliminates the need for a pretreatment step such as firing. Therefore, the manufacturing process of the electron gun cathode assembly is greatly simplified as compared with the related art.

Further, according to the method of manufacturing an electron gun cathode structure according to the present invention, the spacer for defining the distance between the first and second grids and the first grid are formed of an insulator for supporting them. In a method for manufacturing a fixed electron gun cathode assembly, a step of preparing a member in which a step between a first surface and a second surface is equal to this distance; a step of mounting a first grid on the first surface; Placing the spacer on the second surface, placing the insulator on the first grid and the spacer, and pressing the insulator toward the spacer and pressing the first grid toward the member; Fixing the first grid and the spacer to the insulator.

According to this manufacturing method, the insulator placed on the first grid and the spacer is pressed toward the spacer and the first grid is pressed against the member.
The first grid 3 and the spacer 2 can be brought into contact with the insulator 4 in a manner different from the surface contact as shown in FIG. Therefore, instead of brazing, it is possible to employ a fixing method (for example, with glass) that is suitable for fixing other than the surfaces and does not require a preparation step, so that the manufacturing process of the electron gun cathode assembly is significantly larger than before. Simplified.

In addition, as in the manufacturing method shown in FIG. 6, either the portion where the insulator is fixed to the first grid or the portion where the insulator is fixed to the spacer plays a role of buffering. , The distance between the first and second grids is also defined with high accuracy by the step between the first and second surfaces.

Further, according to the method for manufacturing an electron gun cathode assembly according to the present invention, the spacer for defining the distance between the first and second grids and the first grid are formed of an insulator for supporting them. In the method for manufacturing the fixed electron gun cathode assembly, a step of preparing a member in which the steps of the first and second surfaces are equal to this distance, providing projections on the first grid and the spacer, and forming these projections Providing a concave portion for insertion in the insulator;
Mounting the first grid with the protrusions facing upward on the surface of the surface, mounting the spacer with the protrusions facing upward on the second surface, and inserting the spacers into the recesses. The method is characterized by comprising a step of placing an insulator on one grid and the spacer, and a step of fixing the first grid and the spacer to the insulator at a contact portion between the projection and the recess.

According to this manufacturing method, the first grid, the spacer, and the insulator are fixed at the contact portion between the projection and the concave portion, so that the first grid, the spacer, and the insulator are suitable for fixing at such a contact portion instead of brazing. An unnecessary fixing method (for example, with glass) in the preparation process can be employed.
Therefore, the manufacturing process of the electron gun cathode assembly is greatly simplified as compared with the related art.

In addition, as in the manufacturing method shown in FIG. 6, either the portion where the insulator is fixed to the first grid or the portion where the insulator is fixed to the spacer plays a role of buffering, so that the dimensional accuracy of each part is reduced. , The distance between the first and second grids is also defined with high accuracy by the step between the first and second surfaces.

In the electron gun cathode structure according to the present invention, a spacer for defining a distance between the first and second grids and the first grid are fixed to an insulator for supporting the first and second grids. In the electron gun cathode assembly, projections are provided on the first grid and the spacer, respectively, and recesses for inserting these projections are provided on the insulator.
An insulator is placed on the grid and the spacer, and the first grid and the spacer are fixed to the insulator by glass at a contact portion between the projection and the recess.

When this electron gun cathode assembly is used in an electron gun, the deformation of the first grid at the time of beating in the electron gun is the same as in the above-mentioned invention filed by the present applicant (Patent Application Publication No. JP-A-5-36360). And the distance between the first and second grids is precisely defined by the spacer. In addition, since the manufacturing process is greatly simplified by using glass, the cost of the electron gun can be reduced.

[0024]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a system diagram illustrating the entire manufacturing process of an electron gun cathode assembly when the first grid and spacer are fixed to an insulator by attaching glass.

The first P21 to P22 correspond to P1 to P in FIG.
In the same manner as in step 2, the ceramic powder is press-molded and fired to produce an insulator for a support. P23 is a barrel polishing step of finishing the surface of the insulator, similarly to P13 in FIG. P24 is also a step of setting the first grid, the spacer, and the sleeve holder to an insulator, similarly to P14 of FIG.

The following P25 is a step of applying glass to contact points between the first grid and the spacer and the insulator, and P26 is a step of firing this glass.
Through these two steps, the first grid and the spacer are fixed to the insulator by attaching the glass. The following P2
7 to P31 are the same steps as P16 to P20 in FIG.

As is clear from the comparison between FIG. 1 and FIG.
Since the first grid and the spacer are fixed to the insulator by attaching the glass, all the steps P3 to P12 in FIG. Therefore, the manufacturing process of the electron gun cathode assembly is greatly simplified as compared with the related art.

Next, an embodiment of the present invention will be described with reference to FIGS. First, as shown in FIG. 2, a central surface 5a and two surfaces 5b on both sides thereof which are lower than the surface 5a.
And the step between surface 5a and surface 5b is made of metal spacer 6
Distance d12 between the first and second grids defined by
A jig 5 with a glass equivalent to is prepared.

Further, as shown in FIG.
Are provided at both ends thereof, and the spacer 6 is provided with the protruding claws 6a. Insulator 8 is provided with concave portions 8a for inserting claws 6a near both ends, respectively, and concave portions 8b for inserting claws 7a.
Are provided at positions closer to the center than the recess 8a, and a hole 8c for passing the sleeve is penetrated through the center. Then, the first grid 7, the claws 7a of the spacer 6,
A non-crystalline sealing glass is applied to each of 6a.

Subsequently, as shown in FIG. 3, a first grid 7 is placed on the surface 5a of the jig 5 with glass so that the claws 7a face upward, and a spacer is provided on each surface 5b. 6 is placed such that the claws 6a face upward. Then, the insulator 8 is placed on the first grid 7 and the spacer 6 while inserting the claws 7a, 6a into the recesses 8b, 8a, respectively. The first grid 7 and the spacer 6
The dimensions of the insulator 8 when the insulator 8 is placed in this way
Are determined so that the lower surface of the first grid 7 contacts the upper surface of the spacer 6 but does not contact the upper surface of the first grid 7.

Subsequently, as shown in FIG. 4, jigs 5c are placed on both ends of the insulator 8, respectively.
Another jig 5 d is placed on the first grid 7 through the hole 8 c of the insulator 8. In this state, the insulator 8 is pressed against the spacer 6 by the jig 5c, and the nails 7a, 6a are pressed independently of the first grid 7 by pressing the first grid 7 toward the glass-provided jig 5 side. Baking the sealing glass applied to the substrate.
Thereby, the first grid 7 and the spacer 6 and the insulator 8
Are fixed at the contact portions between the claws 7a and 6a and the concave portions 8b and 8a by attaching a glass.

According to this embodiment, not only is the manufacturing process of the electron gun cathode assembly greatly simplified than in the prior art, but also the fixing portion between the insulator 8 and the first grid 7 or the insulator 8
Either of the fixing portions of the glass and the spacer 6 plays a role of a buffer, so that even if the dimensional accuracy of each component varies, the first and second portions are formed by the step between the surfaces 5a and 5b of the jig 5 with glass. The distance d12 between the two grids is defined with high accuracy.

FIG. 5 shows the first example of each sample when 49 steps of the cathode assembly sample were manufactured with the step between the surfaces 5a and 5b of the jig with glass 5 determined to be 0.247 mm in this embodiment. And the actual measurement result of the distance d12 between the second grid and the focal point microscope. The average value of the distance d12 is 0.2465 mm, which is very close to 0.247 mm, and the standard deviation representing the variation of the distance d12 is a very small value of 0.0025 mm.
It is also proved by the actual measurement result that the distance d12 is defined with high accuracy.

In the above embodiment, as a specific method of attaching glass, an insulator is made of ceramic and an amorphous sealing glass is applied to the claws of the first grid and the spacer. However, the present invention is not limited to this. For example, the insulator is made of crystallized glass, and the crystallized glass is also applied to the first grid and the claw of the spacer (hermetic seal).
By doing so, the glass may be attached.

The present invention is not limited to the above embodiment,
It goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0036]

As described above, according to the method for manufacturing the cathode structure of the electron gun according to the present invention, it is necessary to carry out the pretreatment necessary for fixing the first grid and the spacer to the insulator by brazing. There is an advantage that the process is not required and the manufacturing process of the electron gun cathode assembly can be greatly simplified as compared with the related art.

Further, in the method for manufacturing an electron gun cathode assembly according to the present invention, a member having first and second surfaces with steps equal to the distance between the first and second grids defined by the spacer is prepared. In the method of mounting a first grid and a spacer on the first and second surfaces, respectively, and mounting an insulator thereon, the first grid and the spacer are fixed to the insulator by a fixing method other than brazing. According to the structure which can be made to work, in addition to the above-mentioned benefits, either the fixing portion between the insulator and the first grid or the fixing portion between the insulator and the spacer serves as a buffer. In addition, there is an advantage that the distance between the first and second grids can be defined with high accuracy by the step between the first and second surfaces even if the dimensional accuracy of each component varies.

Further, when the electron gun cathode structure according to the present invention is used for an electron gun, the first grid can be directly attached to the second grid via the spacer, so that the heat generated during the beating by the glass support rod can be reduced. The influence of pressure etc. does not reach the first grid. Therefore, there is an advantage that the distance accuracy can be prevented from being deteriorated due to the deformation of the first grid during the beating as in the related art. In addition, since the first grid can be directly attached to the second grid via the spacer while the spacer and the first grid are fixed on the same insulator, there is no need to remove the spacer after beating. Therefore, there is an advantage that the distance between the first and second grids can be precisely defined by the spacer. In addition, the adoption of the glass attachment greatly simplifies the manufacturing process as compared with the related art, so that there is an advantage that the cost of the electron gun can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating the entire manufacturing process of an electron gun cathode assembly employing the present invention.

FIG. 2 is a partially sectional front view showing an embodiment of the present invention.

FIG. 3 is a front view showing one embodiment of the present invention.

FIG. 4 is a front view showing one embodiment of the present invention.

FIG. 5 is a frequency distribution diagram showing an actual measurement result of a distance between first and second grids.

FIG. 6 is a view showing an example of a conventional method for manufacturing a cathode structure of an electron gun.

FIG. 7 is a system diagram showing an entire manufacturing process of a conventional electron gun cathode assembly.

[Explanation of symbols]

1 jig with brazing, 1c, 5c, 5d jig, 2, 6
Spacer, 3, 7 First grid, 4, 8 Insulator, 5 Jig with glass, 6a, 7a Nail, 8
a, 8b recess

Claims (4)

[Claims] 1. A method for manufacturing an electron gun cathode assembly, wherein a spacer for defining a distance between first and second grids and the first grid are fixed to an insulator for supporting the first and second grids. A method for manufacturing an electron gun cathode assembly, comprising: fixing the first grid and the spacer to the insulator by attaching glass. 2. A method for manufacturing an electron gun cathode assembly, wherein a spacer for defining a distance between first and second grids and the first grid are fixed to an insulator for supporting the first and second grids. A step of preparing a member having a step between the first and second surfaces equal to the distance; a step of placing the first grid on the first surface; and a step of placing the spacer on the second surface. Placing the insulator on the first grid and the spacer; and pressing the insulator toward the spacer and pressing the first grid toward the member, Fixing the grid and the spacer to the insulator. 3. A method for manufacturing an electron gun cathode assembly, wherein a spacer for defining a distance between first and second grids and the first grid are fixed to an insulator for supporting the first and second grids. A step of preparing a member having a step difference between the first and second surfaces equal to the distance; and a step of providing projections on the first grid and the spacer, and providing a recess in the insulator for inserting the projections. Mounting the first grid on the first surface with the protrusions facing upward; mounting the spacer on the second surface with the protrusions facing upward; Placing the insulator on the first grid and the spacer while inserting the protrusion into the recess; and removing the first grid and the spacer at a contact portion between the protrusion and the recess. Manufacturing method of the electron gun cathode structure, characterized in that a step of fixing the edge thereof. 4. An electron gun cathode structure in which a spacer for defining a distance between first and second grids and the first grid are fixed to an insulator for supporting the first and second grids. A projection is provided on each of the grid and the spacer, and a recess for inserting the projection is provided on the insulator. The insulator is placed on the first grid and the spacer by inserting the projection into the recess. An electron gun cathode structure, wherein the first grid and the spacer are fixed to the insulator by a glass at a contact portion between the protrusion and the recess.