JP2002015667A - Manufacturing method of color selection mechanism body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a color selection mechanism body in which wrinkles are not be generated on an electrode element body after a blackening processing, and to prevent an AG swinging. SOLUTION: In the manufacturing method of the color selection mechanism body including a washing process washing a frame formed by welding two or more members which consist of metal material with each other, a seam- welding process seam-welding the electrode element body with the frame after welding small metallic parts to the washed frame, and a blackening process blackening the united frame and the electrode element body, an annealing process having the same heat schedule with the blacking process, before the seam- welding process after the welding of the small metallic parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color selection mechanism in which a blackening process is performed after an electrode element is seam-welded to a frame made of a metal material.

[0002]

2. Description of the Related Art In a cathode ray tube 1 shown in FIG.
It has green and blue phosphor layers, and irradiates the phosphor with an electron beam to display an image. At that time, a color selection mechanism 5 is used as a means for accurately irradiating the predetermined phosphor with an electron beam that illuminates the three phosphors of red, green, and blue. The color selection mechanism 5 mainly includes a color selection mask (electrode element) 7 for selectively transmitting an electron beam, and a frame 9 supporting the electrode element 7. The frame 9 includes an A member 9a to which the electrode element body 7 is seam-welded, and a B member 9b that supports the A member 9a.

In particular, in a color cathode ray tube 1 of the Trinitron (registered trademark) type, an electrode element (FAG: Flat Apertur
e Grill) 7 has slit holes 11 of vertical stripes shown in FIG. 5, and is stretched on frame 9 in a state where a predetermined tension is applied. In addition, due to the structure of the color selection mechanism 5, the space between the slit holes 11 is substantially a thin tape shape (hereinafter referred to as A) shown in FIG.
G tape 13). For this reason, a phenomenon (hereinafter referred to as AG fluctuation) in which the AG tape 13 resonates in response to vibrations such as external sound and impact may occur.

[0004] This resonance phenomenon causes a mislanding in which the electron beam emitted from the electron gun 14 deviates from its original trajectory, and causes deterioration of the displayed image. Therefore, in this type of cathode ray tube 1, measures are taken to prevent vibration of the AG tape 13.

As the most widely used anti-vibration measures at present, as shown in FIG. 7, the anti-vibration wire 1 is placed on the surface of the electrode body 7 in a state perpendicular to the longitudinal direction of the slit hole 11.
5 is known. This anti-vibration wire 15
Are supported by a spring member 17 attached to the left and right vertical frames (B members 9b), and are stretched on the electrode body 7 with a predetermined tension by the pulling force of the spring member 17. In this configuration, the anti-vibration wire 15 is brought into contact with the AG tape 13 located between the respective spring members 17 so that the AG tape 1 caused by external vibration or the like can be obtained.
3 can be prevented.

[0006]

By the way, in the conventional method for manufacturing a color selection mechanism, as shown in FIG. 6, the electrode element 7 is substantially uniform along the surface curve of the A member 9a. It is stretched so as to form a curved surface with an appropriate radius of curvature (single R), and the contact pressure of the anti-vibration wire 15 stretched on the electrode body 7 is uniformly applied to all the AG tapes 13. ing. Further, after the seam welding of the electrode body 7, the residual distortion of the frame alone, which occurs when the electrode body 7 is stretched,
Thermal (welding) mechanical (pressure) distortion reduction in, called stabilization AG tape tension, rust by Kurokamaku (Fe ₃ O _4), prevention of light diffuse reflection, the blackening purposes such Heat treatment is performed. However, after the blackening treatment, uneven surface irregularities (AG wrinkles) are generated on the surface of the electrode body, and the anti-vibration wire 15
There is a problem that a portion that does not come into contact with the tape 13 is generated and causes AG fluctuation, and depending on the degree thereof, mislanding is caused. The mechanism of the generation of the AG wrinkles is that the internal stress distortion remaining in the color selection mechanism is released by the blackening treatment, and the electrode element 7
May creep. That is, due to the blackening process, the stress distortion remaining inside
, And the deformation causes a concentration of stress in the electrode body 7, and the plastic deformation of the electrode body 7 increases with time. Then, if the AG tape 13 is plastically deformed, the contact with the anti-vibration wire 15 becomes non-uniform, and the above-mentioned AG swing is generated. The present invention has been made in view of the above circumstances, and provides a method of manufacturing a color selection mechanism that does not cause wrinkles in an electrode body after a blackening process.
The purpose is to prevent shaking.

[0007]

According to a first aspect of the present invention, there is provided a method of manufacturing a color selecting mechanism, comprising: forming a frame formed by welding a plurality of members made of a metal material; A step of washing, and a step of seam-welding the electrode body to the frame after welding the small metal parts to the washed frame, and blackening the integrated frame and the electrode body. And a method of manufacturing a color selection mechanism including a process of performing, before the seam welding process after welding of the small metal parts, performing an annealing process of the same heat schedule as the blackening process. I do.

In this method of manufacturing a color selection mechanism, an annealing process having the same heat schedule as that of the blackening process is performed before the seam welding process after the welding of the small metal parts, so that the final black A metal internal structure state equivalent to the metal internal structure formed during the annealing in the passivation process can be obtained in advance. Accordingly, the electrode element body is seam-welded with the degree of release of the internal stress remaining in the frame being made equal. That is, it becomes meaningful to set the same heat schedule as the blackening process. As a result, it is possible to prevent wrinkles of the electrode element body caused by distortion that appears in the frame only after the blackening process.

A second aspect of the present invention is a method of manufacturing a color selection mechanism, wherein the annealing is performed in an atmosphere of a modified gas that does not generate red rust on the object to be heat-treated.

[0010] In the method of manufacturing the color selection mechanism, in the annealing treatment performed before the blackening treatment, the atmosphere is a transformed gas that does not generate red rust on the heat-treated object.
No red rust occurs on the heat-treated material before the blackening treatment.

According to a third aspect of the present invention, in the method of manufacturing a color selection mechanism, the annealing is a blackening performed in a subsequent process.

In this method of manufacturing a color selection mechanism, the annealing process is the same as the blackening process performed in the subsequent process.
The same heat treatment furnace (blackening furnace) as the blackening treatment can be used, and a separate heat treatment furnace for the annealing treatment is not required. Also,
Since the same atmosphere as that of the blackening treatment is used in addition to the annealing treatment, it is not necessary to use a separate metamorphic gas generation facility that does not generate red rust on the heat-treated object during the annealing treatment. Will be effectively substituted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for manufacturing a color selection mechanism according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a flowchart showing a procedure of a method for manufacturing a color selection mechanism according to the present invention, FIG.
FIG. 3 is a graph showing a heat schedule of the blackening process. The same members as those shown in FIGS. 4 to 7 are denoted by the same reference numerals, and overlapping description will be omitted.

As shown in FIG. 1, in the method of manufacturing the color selection mechanism according to the present embodiment, first, similarly to the conventional method, the frame 9 after the A members 9a and B members 9b are formed by welding. Cleaning is performed (step 1). This cleaning is performed to remove rust-preventive oil and dust adhering to the frame 9. Specifically, after degreasing with a degreasing detergent,
Rinsing is performed with pure water, followed by washing with hot water and rust prevention, and finally drying by blowing with hot air to complete the process.

After the cleaning step, small metal parts are welded to the cleaned frame 9 (steps 2 and 3). As this small metal part, an STC plate 2 shown in FIG.
1. There is a spring holder 23. STC21 is Se
It is an abbreviation of lf Thermal Compensator and is made of a stainless steel flat plate having a larger expansion coefficient than the B member 9b. Since the STC plate 21 is spot-welded to the lower portion of the B member 9b, image degradation due to temperature expansion of the electrode element body 7 during operation of the cathode ray tube is reduced by the bimetal effect.

The spring holder 23 is spot-welded as a seat plate for attaching the spring to the frame 9. The spring holder 23 is a bimetal plate, and serves to correct the temperature expansion of the electrode element 7 which bends in a specific direction when the temperature of the cathode ray tube rises when the cathode ray tube is activated and adversely affects image quality.

The frame 9 to which the small metal parts 21 and 23 are attached is subjected to an annealing process (step 4). This annealing process is performed according to the same heat schedule as the blackening process performed later. That is, as shown in FIG. 2, for example, a heating rate of 10 to 20 ° C./min, 45
Keep more than 5 ℃ for 15-20min, temperature lowering rate 5-10 ℃
/ Min, and the furnace outlet temperature is 160 ° C. or less.

The atmosphere in the furnace in the annealing process
Is in a modified gas atmosphere that does not generate red rust
Done in This transformed gas is, for example, CO 2_Two , CO, H
_Two, H _Two O, N_Two Mixed gas. this
The red rust (Fe_Two O_Three ) Is prevented.

Further, when the altered gas is the same as the altered gas used for the blackening process, the modified gas supply means 24 and the electric heater 25 shown in FIG. The blackening furnace 27 may perform the blackening process.
Therefore, in this case, two blackening processes are performed before and after the subsequent electrode body seam welding step.
It should be noted that the modified gas used in the annealing treatment may not be the same as the modified gas used in the blackening treatment performed later, as long as the generation of red rust can be prevented.

The electrode body 7 shown in FIG. 2C is seam-welded to the annealed frame 9 in the same manner as in the prior art (step 5).

The color selection mechanism 5 in which the electrode element 7 is seam-welded to the frame 9 is finally subjected to a blackening process (step 6). In the blackening process, the blackening furnace 27 used in the above-described annealing process is used, and the process is performed in the same atmosphere of the modified gas and the heat schedule as in the above-described annealing process.
In this blackening treatment, the color selection mechanism 5 is put into the blackening furnace 27 and heat-treated according to the above-mentioned heat schedule, thereby stabilizing the color selection mechanism 5 and mixing and burning air and gas. An oxide film (Fe3 O4) is formed on the surface of the color selection mechanism 5 with the combustion gas (denatured gas).

That is, the blackening process allows the electrode element 7
And the stress on the surface of the electrode element body 7 is removed. Since the heat treatment due to the blackening is the highest in the cathode ray tube manufacturing process, the stress of the color selection mechanism 5 is not released any more thereafter. Also,
The blackening film prevents the reflection of the electron beam and the generation of red rust.

As described above, in the above-described method of manufacturing the color selection mechanism, the annealing process having the same heat schedule as the blackening process is performed before the seam welding process after the welding of the small metal parts. Thus, a metal internal structure state equivalent to the metal internal structure of the frame 9 formed in the annealing in the final blackening process can be obtained in advance. Therefore, the degree of release of internal stress remaining in the frame is set to the same state,
The electrode body 7 is seam-welded. As a result, the occurrence of wrinkles of the electrode element body 7 due to the distortion that first appears in the frame 9 after the blackening process is conventionally prevented.

Further, in the annealing treatment performed before the blackening treatment, the atmosphere is a modified gas that does not generate red rust on the heat treatment target, so that red rust does not occur on the heat treatment target before the blackening treatment.

Further, in the present embodiment, the annealing
Since the blackening treatment is performed in a later step, that is, the same heat treatment furnace (blackening furnace 27) as the blackening treatment can be used, a separate heat treatment furnace for the annealing treatment is not required.
In addition, since the same atmosphere as that of the blackening treatment is used in addition to the annealing treatment, it is not necessary to use a separate transformed gas generation facility that does not generate red rust on the heat-treated object during the annealing treatment. The wrinkling of the electrode element body 7 can be prevented by effectively using the two blackening furnaces 27.

[0026]

As described above in detail, according to the method for manufacturing a color selection mechanism according to the present invention, before the seam welding process, the annealing process having the same heat schedule as the blackening process is performed. It is possible to obtain in advance a metal internal structure state equivalent to the metal internal structure formed during annealing in the final blackening process, and to equalize the degree of release of internal stress remaining in the frame to seam welding the electrode body can do. As a result, it is possible to prevent wrinkling of the electrode element body due to distortion generated in the frame after the blackening process, and to uniformly contact the anti-vibration wire with the AG tape to reliably prevent the AG swing. it can.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure of a method for manufacturing a color selection mechanism according to the present invention.

FIG. 2 is an explanatory view of the situation of the step of FIG. 1;

FIG. 3 is a graph showing a heat schedule of a blackening process.

FIG. 4 is a partially cutaway perspective view of a cathode ray tube.

FIG. 5 is a front view of the color selection mechanism shown in FIG. 4;

FIG. 6 is a side view of the color selecting mechanism shown in FIG. 4 as viewed from the longitudinal direction of the tape.

FIG. 7 is an enlarged perspective view of an anti-vibration wire support portion of the color selection mechanism shown in FIG.

[Explanation of symbols]

5 ... color selection mechanism, 7 ... electrode body, 9 ... frame, 9a
... A member, 9b ... B member, 21 ... STC plate (small metal part), 23 ... Spring holder (small metal part)

Claims (3)

[Claims] 1. A step of cleaning a frame formed by welding a plurality of members made of a metal material to each other, and after welding a small metal part to the cleaned frame, an electrode element body is attached to the frame. A method of manufacturing a color selection mechanism including a step of seam welding and a step of blackening the integrated frame and electrode body, wherein the seam welding step after welding of the small metal parts is performed. A method of manufacturing a color selection mechanism, wherein an annealing process having the same heat schedule as that of the blackening process is performed before. 2. The method for manufacturing a color selection mechanism according to claim 1, wherein the annealing treatment is performed in an atmosphere using a modified gas that does not generate red rust on the object to be heat-treated. 3. The method according to claim 1, wherein the annealing process is a blackening process performed in a subsequent process.