JP3456024B2 - Method of manufacturing cathode member and assembly jig used in the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cathode member incorporated in an electron gun or the like of a cathode ray tube, and an assembling jig used in the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, for example, a fast-moving cathode structure is used for an electron gun of a cathode ray tube. As shown in the schematic cross-sectional view of FIG. 6A, the cathode member 10 constituting this cathode assembly is composed of a sleeve member 11 and a cap member 12 welded to the top of the sleeve member 11. The sleeve member 11 is made of, for example, a Ni—Cr alloy, has a diameter of 1 to 2 mm, a thickness of 10 to 30 μm, and a length of 6
It has a hollow cylindrical shape with both ends opened up to 7 mm. The sleeve member 11 is blackened in a wet hydrogen atmosphere,
A chromium oxide layer is formed on the surface of the sleeve member 11. The cap member 12 is made of a base metal in which a reducing agent such as magnesium (Mg), tungsten (W), or silicon (Si) of several% or less is added to nickel (Ni). The inner surface of the side wall of the cap member 12 and the outer surface of the top of the sleeve member 11 are engaged with each other. By reducing the diameter of the sleeve member 11, the heat capacity of the cathode member can be reduced, and the operation start-up time of the electron gun can be shortened. However, as a result of the heat capacity of the cathode member being reduced, the temperature of the cathode member is higher than a desired temperature. Rise to. Such a temperature increase leads to a shortened life of the electron gun. Therefore, the sleeve member 11 is subjected to blackening treatment to increase the thermal emissivity of the sleeve member 11 and suppress the temperature rise of the cathode member 10.

As shown in FIG. 6B, the cathode assembly is formed by applying such a cathode member 10, a heater 13 housed inside a sleeve member 11, and a top surface of a cap member 12 by, for example, a spraying method. It is composed of the carbonate 14 which is an emission source formed by the above. Two V tabs (not shown) are welded to the outer surface of the side wall of the sleeve member 11. When assembling a three electron gun type electron gun, the V tabs of each of the three cathode assemblies for RGB are welded to the metal pins (not shown) embedded in the ceramic disc by fusing the glass. .

The conventional method of assembling such a cathode member is
Hereinafter, description will be given with reference to FIG. 7, which is a schematic cross-sectional view of the sleeve member and the like.

[Step-10] First, the cylindrical sleeve member 11 having both ends opened is inserted into the rod-shaped assembly jig 30 from the bottom thereof ((A) in FIG. 7).
reference). The assembly jig 30 is vertically attached to a suitable plate 21. The assembly jig 30 is made of, for example, a stainless steel round bar and has an outer diameter of the sleeve member 11.
Slightly smaller than the inner diameter of. When the inner diameter of the sleeve member 11 is 1.5 mm, for example, the outer diameter of the assembly jig 30 is 1.1.
It is about mm. Further, the length of the assembly jig 30 is slightly shorter than the length of the sleeve member 11, or
Is almost equal to the length of.

[Step-20] Next, after covering the top of the sleeve member 11 with the cap member 12 (see FIG. 7B), the side surface of the cap member 12 is irradiated with a laser beam to allow the sleeve member and the cap member to shine. And are welded together (see FIG. 7C). Sleeve member 1
Since a chromium oxide layer has been previously formed on the outer surface of 1,
Since a spark is generated when the resistance welding method is used, the laser welding method is usually used. There are usually three welding points at 120 ° intervals. In this way, the cathode member 10 is assembled.

[Step-30] Then, the cathode member 10 is taken out from the assembly jig 30.

[0008]

When the sleeve member 11 and the cap member 12 are laser-welded, the sleeve member 11 heated by the laser beam is partially melted. The metal vapor generated at this time adheres to the outer surface of the assembly jig 30, is cooled and solidified on the outer surface of the assembly jig 30, and is deposited on the outer surface of the assembly jig 30. When 5000 to 10000 cathode members are assembled, as schematically shown in FIG. 8A, the metal deposited on the outer surface of the assembly jig 30 (hereinafter referred to as a metal piece) becomes an ice column, and finally, , Sleeve member 11
Until it reaches the inner surface of the side wall.

When the cathode member is assembled in such a state, the metal piece is fixed to the inner surface of the side wall of the sleeve member 11.
After assembling the cathode member 10, when the cathode member 10 is taken out from the assembly jig 30, the metal piece remains on the inner surface of the side wall of the sleeve member 11 (see FIG. 8B). When the heater 13 is inserted into the hollow portion of the cathode member 10 as described above, the heater 13 cannot be inserted into the hollow portion of the cathode member 10 due to the obstruction of the metal piece. In the conventional method of assembling the cathode member, manufacturing defects of the cathode member due to the laser welding method and the assembling jig have occurred.

Therefore, it is an object of the present invention to provide a method of manufacturing a cathode member, which can surely suppress the occurrence of manufacturing defects of the cathode member when assembling the cathode member based on the conventional laser welding method, and a manufacturing method thereof. It is to provide an assembly jig to be used.

[0011]

[Means for Solving the Problems] The above object, both ends inserted a cylindrical sleeve member having an opening from the bottom to the rod-shaped assembly jig, then, after capped member on top of said sleeve member a method of manufacturing a cathode member, including the step of welding the said cap member and said sleeve member by irradiating a laser beam on the side surface of the cap member,
The sleeve member is located farther than the laser beam irradiation position.
Of the bottom side can top surface is achieved by a method for producing a cathode member according to the first aspect of the present invention, which comprises using the assembly jig of the rod-shaped located, or alternatively, before
The sleeve heated by irradiation with a laser beam
The metal vapor generated when the member partially melts,
Before being formed to a length that will not stick to the outside of the assembly jig
The present invention is characterized in that a stick-shaped assembly jig is used.
Achieved by the method for manufacturing a cathode member according to the second aspect.
You can

[0012] Alternatively, the above object is achieved, both ends inserted a cylindrical sleeve member having an opening from the bottom to the rod-shaped assembly jig, then, after capped member on top of said sleeve member, said cap a method of manufacturing a cathode member which is irradiated with a laser beam to the side surface of the member comprising the step of welding the said cap member and said sleeve member, said <br/> laser beam irradiation position, the assembly jig of the bar Can be achieved by the method for manufacturing a cathode member according to the third aspect of the present invention, characterized in that the relationship with the relative position in the circumferential direction is changed for each manufacture of the cathode member.

[0013] The above objects, after capped member on top of the cylindrical sleeve member having opposite open ends, the said sleeve member by irradiating a laser beam on the side surface of the cab <br/>-up member used in the manufacturing process of the cathode member to be welded and a cap member, said sleeve member is inserted and the the assembly jig rod-shaped for fixing the sleeve member, than the laser beam irradiation position, the scan
This can be achieved by the assembly jig according to the first aspect of the present invention, characterized in that the top surface is located on the bottom side of the leave member , or by irradiation with the laser beam.
When the sleeve member heated by
Prevent the generated metal vapor from adhering to the outside of the assembly jig.
Second aspect of the present invention characterized in that the second length is formed in various lengths.
This can be achieved by the assembling jig according to the above aspect .

[0014]

In the rod-shaped assembling jig according to the first aspect of the present invention, the sleeve member is positioned more than the laser beam irradiation position.
The top surface of the rod-shaped assembly jig is located on the bottom side, or
The sleeve member heated by the irradiation of the laser beam
The metal vapor generated during partial melting is outside the assembly jig.
Form a rod-shaped assembly jig with a length that will not adhere to the side
It Further, in the method for manufacturing a cathode member according to the first aspect or the second aspect of the present invention, such a method of the present invention
The assembling jig according to the first aspect or the second aspect is used. Therefore, the metal vapor generated when the sleeve member heated by the irradiation of the laser beam partially melts adheres to the inner surface of the side wall of the sleeve member, but does not adhere to the outer surface of the assembly jig. Even if it adheres to the outer surface (particularly the top surface) of the assembly jig, it does not grow into an ice column shape or to the inner surface of the side wall of the sleeve member.

In the method for manufacturing a cathode member according to the third aspect of the present invention, the relationship between the laser beam irradiation position and the relative position in the circumferential direction of the rod-shaped assembly jig is determined for each manufacturing of the cathode member. Be different. Therefore, the metal vapor generated when the sleeve member heated by the irradiation of the laser beam partially melts adheres to different portions on the outer surface of the assembly jig for each production of the cathode member. Therefore, it is possible to prevent the metal pieces from growing in an ice column shape on the outer surface of the assembly jig for a long time.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

[0017] (Example 1) Example 1, assembly jig according to the first aspect and the second aspect of the present invention, as well as the first and second embodiments <br/> of the present invention The present invention relates to a method for manufacturing such a cathode member. Sleeve member 11
The assembly jig 20 of the first embodiment will be described with reference to FIG. 1C schematically showing a state in which the cap member 12 and the cap member 12 are laser-welded. In the assembly jig 20 of the first embodiment, the cap member 12 is placed on the top of the cylindrical sleeve member 11 having open ends, and then the side surface of the cap member 12 is irradiated with a laser beam to allow the sleeve member 11 and the cap member 12 to shine. It is a rod-shaped assembly jig that is used in the manufacturing process of the cathode member for welding and to insert the sleeve member 11 and fixes the sleeve member 11.

The top surface 2 of the assembly jig 20 of the first embodiment
0A is located at a position lower than the laser beam irradiation position. The length (L) of the assembly jig 20 may be any length as long as the top surface 20A has such a positional relationship, for example, about 1/10 to 2/3 of the length of the sleeve member 11. However, it is not limited to this value. In short, the metal vapor generated when the sleeve member 11 heated by the irradiation of the laser beam is partially melted does not adhere to the outer surface (top surface) of the assembly jig 20 in the assembly jig 20. You can decide the length. The assembly jig 20 is made of, for example, a stainless steel round bar, and its outer diameter is slightly smaller than the inner diameter of the sleeve member 11. The inner diameter of the sleeve member 11 is, for example, 1.5 m
In the case of m, the outer diameter of the assembly jig 20 is about 1.1 mm. The assembly jig 20 is vertically attached to an appropriate plate 21.

The method of manufacturing the cathode member of Example 1 will be described below with reference to FIG.

[Step-100] First, the cylindrical sleeve member 11 having both open ends is inserted into the rod-shaped assembly jig 20 from the bottom thereof ((A) in FIG. 1).
reference). A V tab (not shown) may be welded to the outer surface of the side wall of the sleeve member 11 in advance.

[Step-110] Next, after covering the top of the sleeve member 11 with the cap member 12 (see FIG. 1 (B)), the side surface of the cap member 12 is irradiated with a laser beam and the sleeve member and the cap member. And are welded together (see FIG. 1C). There are usually three welding points at 120 ° intervals. In this way, the cathode member 10 is assembled.

[Step-120] Then, the cathode member 10 is taken out from the assembly jig 20.

In the first embodiment, since the top surface 20A of the assembly jig 20 is located at a position lower than the laser beam irradiation position, the sleeve member 11 heated by the laser beam irradiation in [Step-110]. The metal vapor generated when the metal is partially melted does not adhere to the outer surface of the assembly jig 20, but mainly adheres to the inner surface of the side wall of the sleeve member 11 as schematically shown in FIG. is there.

[0024] With reference to Reference Example sleeves member 11 and a state of laser welding the cap member 12 of Figure 3 showing schematically (A), following
The assembly jig of the reference example will be described below. Assembly jig 2 for reference example
2 is similar to the assembly jig 20 of the first embodiment, the cap member 12 is provided on the top of the cylindrical sleeve member 11 having both ends opened.
Used in the manufacturing process of the cathode member in which the side surface of the cap member 12 is irradiated with a laser beam and the sleeve member 11 and the cap member 12 are welded together, the sleeve member 11 is inserted and the sleeve member 11 is fixed. It is a rod-shaped assembly jig for.

In the assembly jig 22 of the reference example , the root portion 22A is thick and the portion 2 corresponding to the laser beam irradiation position is formed.
2B has a small diameter. When the diameter of the root portion 22A is D, the diameter of the portion 22B corresponding to the laser beam irradiation position is preferably, for example, 0.1D to 0.7D, but is not limited to this value. The length of the root portion 22A is preferably, for example, about 1/10 to 2/3 of the length of the sleeve member 11, but is not limited to this value. The assembly jig 22 can be manufactured by cutting a round bar of stainless steel, for example. When the inner diameter of the sleeve member 11 is 1.5 mm, for example, the outer diameter of the root portion 22A of the assembly jig 22 is about 1.1 mm. The diameter of the portion 22B corresponding to the laser beam irradiation position is 0.8 mm, for example.

The method of manufacturing the cathode member of the reference example is substantially the same as the method of manufacturing the cathode member of Example 1 except that the shape of the assembly jig used is different from that of Example 1. That is,
The cylindrical sleeve member 11 with both ends opened is inserted into the rod-shaped assembly jig 22 from the bottom, and then the cap member 12 is covered on the top of the sleeve member 11, and then the side surface of the cap member 12 is irradiated with a laser beam. Then sleeve member 1
1 and the cap member 12 are welded together, and then the cathode member 1
0 is taken out from the assembly jig 22.

The assembling jig of the reference example is an assembling jig in which the diameter of the portion corresponding to the laser beam irradiation position is thin, and in the manufacturing method of the cathode member of the reference example , such an assembling jig is used. Is used. Therefore, even if the metal piece adheres to the outer surface of the assembly jig by the metal vapor generated when the sleeve member heated by the irradiation of the laser beam partially melts, the metal piece adheres to the inner surface of the side wall of the sleeve member 11. Never reach.

In the assembly jig 22 of the reference example , the diameter of the portion 22B corresponding to the laser beam irradiation position may be small. Therefore, for example, as shown in FIG. 3B, the diameter of the top portion 22C of the assembly jig may be larger than the diameter of the portion 22B corresponding to the laser beam irradiation position.

( Example 2 ) Example 2 relates to a method for manufacturing a cathode member according to the third aspect of the present invention. In the second embodiment , the conventional assembly jig 3
0 is used. In the method for manufacturing the cathode member of Example 2 , the cylindrical sleeve member 11 having both ends opened is inserted into the rod-shaped assembly jig 30 from the bottom thereof, and then the cap member 12 is put on the top of the sleeve member 11. , Cap member 12
And irradiating the side surface of the sleeve member with a laser beam to weld the sleeve member 11 and the cap member 12 together. Then, the relationship between the laser beam irradiation position and the relative position of the rod-shaped assembly jig in the circumferential direction is made different for each manufacture of the cathode member.
Specifically, a cylindrical sleeve member 11 with both ends open
The assembly jig 30 is rotated by, for example, 1 ° before being inserted into the rod-shaped assembly jig 30 from the bottom thereof. Then, the sleeve member 11 is inserted into the assembly jig 30 from the bottom thereof. Hereinafter, [Step-110] and [Step-120] of Example 1.
To execute. Note that, for example, the assembly jig 30 may be rotatably attached to a shaft, and the assembly jig 30 may be rotated by a combination of a motor and a gear.

In the method of manufacturing the cathode member of the second embodiment, the metal vapor generated when the sleeve member heated by the irradiation of the laser beam is partially melted, the assembling jig 30 is used every time the cathode member is manufactured. Adheres to different parts of the outer surface of. Therefore, it is possible to prevent the metal piece from growing in the shape of an ice column on the outer surface of the assembly jig 30 for a long time.

In the case of automating the manufacturing method of the cathode member of Example 1 , Reference Example and Example 2 , assembling jigs 20, 22,
30 is attached to the turntable 21A, for example. Then, the sleeve member 11 is inserted into the rod-shaped assembly jig located at the sleeve insertion portion from the bottom using a parts feeder (not shown) or the like. Then turntable 21A
Is rotated, and the cap member 12 is put on the top of the sleeve member 11 using a parts feeder (not shown). Then, the turntable 21A is rotated again to move the assembly jig to the laser welding portion. Then, the side surface of the cap member 12 is irradiated with a laser beam using a laser welding device (not shown) to weld the sleeve member and the cap member. After that, the turntable 21A is rotated again to move the assembly jig to the take-out portion, and the cathode member 10 is taken out from the assembly jig by using an appropriate take-out device (not shown). An apparatus that automates the method for manufacturing such a cathode member is schematically shown in FIG. It should be noted that such a device is an example, and it is possible to appropriately change the design such as using a linear assembly line instead of the turntable.

Although the present invention has been described based on the preferred embodiments, the present invention is not limited to these embodiments. The materials, numerical values, etc. described in the examples are merely examples, and can be changed as appropriate. The structure of the cap member 12 can be changed to the structure shown in FIGS. Also when the cap member 12 having such a structure is welded to the sleeve member 11 by the laser welding method, it is used in the method for manufacturing the cathode member according to the first to third aspects of the present invention, or these methods. The assembly jig of the present invention can be applied.

[0033]

According to the present invention, it is possible to effectively prevent the production failure of the cathode member due to the metal adhering to the inner surface of the side wall of the sleeve member.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a sleeve member and the like for explaining a method for assembling a cathode member and an assembling jig according to a first embodiment.

FIG. 2 is a schematic cross-sectional view of a cathode member and the like showing a state in which metal after laser welding is attached to an inner surface of a side wall of a sleeve member in Example 1.

FIG. 3 is a schematic cross-sectional view of a sleeve member and the like for explaining a method of assembling a cathode member and an assembling jig of a reference example .

FIG. 4 is a schematic view of an apparatus in which a method for manufacturing a cathode member is automated.

5 is a schematic cross-sectional view of a cathode member using a cap member having a structure different from that of FIG.

FIG. 6 is a schematic cross-sectional view of a cathode member and a cathode assembly.

FIG. 7 is a schematic sectional view of a sleeve member and the like for explaining a conventional method of assembling a cathode member.

FIG. 8 is a schematic cross-sectional view of a sleeve member and the like for explaining problems of a conventional method of assembling a cathode member.

[Explanation of symbols]

10 Cathode member 11 Sleeve member 12 Cap member 13 heater 14 carbonate 20,22 Assembly jig 20A Top of assembly jig 21 plates 21A turntable 30 Conventional assembly jig

Claims (5)

(57) [Claims] 1. A both ends inserted a cylindrical sleeve member having an opening from the bottom to the rod-shaped assembly jig, then, after capped member on top of the ground <br/> over blanking member, the cap <br/> a method of manufacturing a cathode member, including the step of the side surface of the flop members by irradiating a laser beam welding the said cap member and said sleeve member, than the laser beam irradiation position, the sleeve member
A method of manufacturing a cathode member, characterized in that the rod-shaped assembling jig whose top surface is located on the bottom side is used. Wherein both ends inserted a cylindrical sleeve member having an opening from the bottom to the rod-shaped assembly jig, then, after capped member on top of the ground <br/> over blanking member, the cap <br/> a method of manufacturing a cathode member to the side surface of the flop member is irradiated with a laser beam comprising the step of welding the said cap member and said sleeve member, said three heated by irradiation of the laser beam
The metal vapor generated when the
The length was set so that it would not adhere to the outside of the assembly jig.
A method for manufacturing a cathode member, characterized in that the rod-shaped assembly jig is used. 3. Insert the cylindrical sleeve member having opposite open ends from the bottom to the rod-shaped assembly jig, then, after capped member on top of the ground <br/> over blanking member, the cap <br/> a method of manufacturing a cathode member including the side surface of the flop members by irradiating a laser beam step of welding said cap member and said sleeve member, and the laser beam irradiation position, an assembly jig of the bar A method of manufacturing a cathode member, characterized in that the relationship with the relative position of the tool in the circumferential direction is made different every time the cathode member is manufactured. After wherein both ends capped member on top of the cylindrical sleeve member having an opening, by irradiating a laser beam on the side surface of said cap member and said sleeve member and said calibration <br/>-up member used in the manufacturing process of the cathode member to be welded, said sleeve member is inserted and a assembly jig rod-shaped for fixing the three <br/> blanking member, than the laser beam irradiation position, wherein Sleeve member
An assembly jig having a top surface located on the bottom side of the . After wherein both ends capped member on top of the cylindrical sleeve member having an opening, by irradiating a laser beam on the side surface of said cap member and said sleeve member and said calibration <br/>-up member used in the manufacturing process of the cathode member to be welded, said sleeve member is inserted and a assembly jig rod-shaped for fixing the three <br/> blanking member, heated by irradiation of the laser beam The three
The metal vapor generated during partial melting of the
An assembly jig, characterized in that the assembly jig is formed in such a length that it does not adhere to the outside of the standing jig.