JPH097505A - Method for manufacturing color selection electrode device for color cathode ray tube - Google Patents

Abstract

(57) [Abstract] [Purpose] In a method of manufacturing a color selection electrode device for a trinitron color cathode ray tube, an aperture grill 1 is welded to an AG frame 2 so as not to cause wrinkles. [Structure] The upper and lower edges of the aperture grille 1 are first contacted with the support member 3 at one point when viewed from above or below, and the contact area is widened from that point so that all the portions of the upper and lower edges to be welded are A state in which the support member 3 is contacted is formed, and welding is performed in this state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selecting electrode device for a color cathode ray tube, and more particularly to a metal plate called an aperture grill having a large number of stripe-shaped slits extending in the vertical direction as a color selecting electrode body. The present invention relates to a method of manufacturing a color selection electrode device including the color selection electrode element of a color cathode ray tube and a frame-shaped metal structure supporting the color selection electrode element.

[0002]

2. Description of the Related Art A Trinitron (trademark) type color cathode ray tube uses an aperture grill in which a number of stripe-shaped slits (openings) in the vertical scanning direction are formed by selective etching on a metal plate as a color selection electrode body. There is.
The aperture grill has a pair of upper and lower support members (often referred to as "A member" in the applicant company) and a pair of side elastic members (in the applicant company " B member)) are integrated by welding to form a frame-shaped electrode structure, that is, the color selection electrode structure is supported by being welded to an AG frame to form a color selection electrode structure. Installed in a color cathode ray tube.

The above-mentioned pair of supporting members are formed in a cylindrical shape which is convexly curved to the front, and when an aperture grill, which is a color selection electrode body, is welded thereto, it is convexly curved to the front and the axis thereof is oriented vertically. It is designed to form a surface, which is one of the features of the Trinitron color cathode ray tube. Then, the welding has been conventionally performed as shown in FIG. In the drawing, 1 is an aperture grill (strictly speaking, a peripheral 1a) which is a color selection electrode body.
Since it is a stage having a flat aperture grill, it will be simply referred to as "aperture grill" in the present specification for the sake of convenience. ) 2 is an electrode structure A
A pair of support members 3 each having a G frame and an L-shaped cross section,
3 and elastic members 4 and 4.

The supporting members 3 and 3 are the upper and lower members of the AG frame 2, and are welded to the elastic members 4 and 4 which are the side members, so that the AG frame 2 is a substantially rectangular frame-shaped electrode assembly.
Make Reference numerals 5 and 5 denote aperture grill welding surfaces that are convexly curved in the front of the supporting members 3 and 3. The welding surfaces 5 and 5 include upper and lower end edges of the aperture grill 1 (excluding upper and lower peripherals 1a and 1a, to be exact). The edges of both ends are welded. The radius of curvature of the welding surfaces 5 and 5 is R.
F is a supporting member 3 and 3 when welding the aperture grill 1.
Is a force that is applied against the elastic force of the elastic members 4 and 4 so as to reduce the gap between the support members 3 and 3 by a predetermined amount.

After the welding, the welding of the support members 3 and 3 of the aperture grill 1 to the welding surfaces 5 and 5 of the aperture grilles 3 and 5 with the force between the support members 3 and 3 being contracted by a predetermined amount is performed after welding. This is because when the force F is removed, each grill tape (portion between adjacent slits) of the aperture grill 1 receives tension due to the restoring force due to the elasticity of the elastic members 4 and 4 so that it does not easily vibrate. Reference numerals 6 and 6 denote the aperture grill 1 and the support member 3 of the AG frame 2,
A holding jig for preliminarily bending the aperture grill welding surfaces 5 and 5 according to the cylindrical curvature of the aperture grill welding surfaces 5 and 5 before making contact with the aperture grill welding surfaces 5 and 5 for welding. The receiving surface received by the peripherals 1a, 1a is convexly curved. The radius of curvature of the receiving surfaces 7, 7 is r. And
Conventionally, the radius of curvature r has been set smaller than the radius of curvature R of the aperture grill welding surfaces 5, 5 of the support members 3, 3.

Normally, the holding jigs 6, 6 are appropriately spaced apart from the AG frame 2 on the front side (upper side in FIG. 4) of the AG frame 2, and the aperture grill 1 is further pressed from the front side. The jigs are moved to the holding jigs 6, 6 side while being pressed, and the jigs hold the aperture grill 1 (peripheral 1a, 1a thereof) against the holding jigs 6, 6. The so-called aperture grill 1
The upper and lower sides of the are clamped by a holding jig and holding jigs 6, 6. Then, since the aperture grill 1 is thin, it is flexible, and therefore bends along the receiving surfaces of the holding jigs 6, 6. That is, the shape is warped to a shape close to the final cylindrical shape.

Then, the aperture grill 1, the holding jigs 6, 6 and the crimping jig are integrally moved to the AG frame 2 side, and the upper and lower end edges of the aperture grill 1 in a cylindrically warped state are supported by the supporting members 3, 3, 3. Aperture grille welding surfaces 5 and 5 are hit with a predetermined strength. Further, a force is applied so as to extend vertically (in the vertical scanning direction). This is to eliminate wrinkles on the aperture grille 1. Then, welding is performed in that state. Incidentally, as described above, this welding is performed in a state in which the force F on the support members 3 and 3 is applied.

After welding, the holding jigs 6, 6 and the pressing jig are moved to release the clamped state of the aperture grill 1, and then the peripherals 1a, 1a of the aperture grill 1 are cut and removed. Then, an aperture grill 1 which is a color selection electrode element body and an AG frame 2 which is an electrode structure can substantially form a color selection electrode device. still,
After that, a damper wire that presses the grill tape of the aperture grill 1 to suppress its vibration is attached to the elastic members 4 and 4 via a damper spring welded to the elastic members 4 and 4.

[0009]

By the way, in the prior art, the aperture grill 1 welded to the AG frame 2 is conventionally used.
In many cases, wrinkles 8 and 8 as shown in FIGS. 5A and 5B were formed. Incidentally, FIG. 5A is a front view of the color selection electrode device, and FIG. 5B is a view of the arrow of FIG. Wrinkles 8,
8 is an aperture grill 1 which is an electrode body during welding,
This is caused by the unstable contact between the AG frame 2 which is the electrode structure and the supporting members 3 and 3, and inhibits the favorable formation of the phosphor stripes and the carbon stripes in the subsequent phosphor screen forming step, and the stripe width. This is a major cause of disturbance in the image quality, and eventually causes deterioration of image quality.

Further, the generation of the wrinkles 8 and 8 causes a non-contact portion between the grill tape and the damper wire, which reduces the vibration suppressing effect of the damper wire by the damper wire. That is, in the Trinitron color cathode ray tube, since the aperture grill formed with the stripe-shaped slit extending in the vertical scanning direction as the opening through which the electron beam passes is used as the color selection electrode element, the grill tape existing between the adjacent slits is Easy to vibrate. This hinders accurate image reproduction and causes color misregistration. Therefore, as described above, the pressing force F is applied to the support members 3 so that a predetermined tension is applied to each grill tape.
Welding is performed in a state where the pressure is applied to the grill tape, and when the applied pressure F is removed after the welding, the restoring force of the elastic members 4 and 4 causes the grill tape to receive a predetermined tension, and the tension suppresses the vibration. There is.

However, in some cases, such tension cannot prevent the vibration caused by a strong shock and a strong sound (television receiver, computer sound). Therefore, as shown in FIGS. 6 (A) and 6 (B), a damper wire is stretched horizontally on the front surface of the aperture grill 1 and each grill tape is pressed by the damper wire to more reliably suppress the vibration and to make it strong. The image is prevented from being deteriorated by shock and voice. 6A is a front view of the color selection electrode device, and FIG. 6B is a view taken in the direction of arrow A of FIG. Figure 6
In, 9, 9 are damper wires, 10, 10, 1
Reference numerals 0 and 10 denote damper springs welded to the elastic members 4 and 4 and supporting the damper wires 9 and 9, and the damper wires 9 and 9 are attached by welding.

However, when wrinkles 8 and 8 as shown in FIG. 5 are formed, a gap, that is, a non-contact portion is formed between the grill tape and the damper wires 9 and 9 at that portion, and inevitably at that portion. The vibration suppressing effect on the grill tape by the damper wires 9, 9 does not occur. Therefore, the grill tape vibrates due to a strong shock or sound, which may cause a problem of image quality deterioration. Then, the inventors of the present application pursued the cause of the wrinkle, and when the aperture grill 1 was brought into contact with the support members 3 and 3 of the AG frame 2, the aperture grill 1 was in contact with both sides of the aperture grill 1, and the contact areas were formed from both sides. It was found that it spreads out and there are some parts that cannot be completely adhered to, resulting in wrinkles 8 and 8.

Further, pursuing the cause thereof, the curvature of the receiving surfaces 7, 7 of the holding jigs 6, 6 shown in FIG. 4 is more than the curvature of the aperture grill welding surfaces 5, 5 of the supporting members 3, 3. It has been found that the strength is high (the radius of curvature is small, that is, r <R), so that the first contact from two points when viewed from above or below the outside causes the contact area to spread from the two points to the inside. That is, in the case of the conventional case where the contact is made at two points first and then the contact area is expanded inward from the contact point,
There is a slight discrepancy in the length between the contact regions of the support members 3 and 3 and the region of the aperture grill 1 to be in contact with, and the region of the aperture grill 1 in contact with is slightly longer, so that there is a non-contact portion. It ends up becoming wrinkles. Therefore, the inventors have searched for a method for preventing such a situation, and have completed the present invention.

The present invention has been made to solve such a problem, and the upper and lower edges of a color selection electrode body made of a metal plate in which a large number of stripe-shaped slits extending in the vertical direction are arranged side by side, In a method for manufacturing a color selection electrode device for a color cathode ray tube, in which upper and lower cylindrical support members are welded to upper and lower support members of a frame-shaped electrode structure held by left and right elastic members, a color selection electrode element is wrinkled on the electrode structure. The purpose is to enable welding so as to prevent the occurrence of

[0015]

According to a first aspect of the present invention, there is provided a method for manufacturing a color selection electrode device for a color cathode ray tube, wherein the upper and lower edges of the color selection electrode body are first viewed from above or below at one point prior to welding. By making contact with the cylindrical support member and expanding the contact area from one point thereof to form a state in which all the portions to be welded at the upper and lower end edges are in contact with the support member, and performing the welding in that state. Characterize.

[0016]

According to the method of manufacturing a color selection electrode device for a color cathode ray tube of claim 1, the color selection electrode body is brought into contact with the support member at one point thereof, and the contact area is expanded from that point to obtain the color. Since the entire area of the selection electrode body to be welded is brought into contact with the electrode structure, the contact area of the support member and the color selection electrode are contacted as in the conventional case in which the contact area is expanded from the two points by contacting the electrode assembly. There is no difference in length between the contact area of the body and wrinkles.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a perspective view for explaining the outline of one embodiment of a method of manufacturing a color selection electrode device for a color cathode ray tube according to the present invention, and FIGS. 2 (A) to 2 (C) are explanatory views of the main part of the embodiment. Three
(A) thru | or (D) are perspective views which show this Example in detail. In the drawing, 1 is a (flat) aperture grill having a peripheral 1a which is a color selection electrode body, and 2 is an AG frame which is an electrode structure and has a cross-sectional shape of L.
It is composed of a pair of support members 3 and 3 and elastic members 4 and 4.

The support members 3 and 3 are upper and lower members of the AG frame 2, and are welded to the elastic members 4 and 4 which are side members to form the AG frame 2 having a substantially rectangular frame shape. 5,5
Is an aperture grill welding surface that is curved in a cylindrical shape on the front surface of the supporting members 3 and 3. The upper and lower end edges of the aperture grill 1 (strictly speaking, the upper and lower peripheral parts 1a and 1a are excluded from the welding surfaces 5 and 5). Both edges are welded. Then, this radius of curvature is R. F is a force applied to the support members 3 and 3 when the aperture grill 1 is welded so as to reduce the gap between the support members 3 and 3 against the elastic force of the elastic members 4 and 4 by a predetermined amount. The reason for applying such a force is as described above.

Reference numerals 6 and 6 are used to bring the aperture grill 1 into contact with the aperture grill welding surfaces 5 and 5 of the supporting members 3 and 3 of the AG frame 2 for welding in advance to form a cylindrical curved surface of the aperture grill welding surfaces 5 and 5. A holding jig for bending together is a receiving surface for receiving the aperture grill 1 by the upper and lower peripherals 1a, 1a and is convexly curved. This radius of curvature is r.
The radius of curvature r is larger than the radius of curvature R of the aperture grill welding surfaces 5, 5 of the holding jig 3.

That is, holding jigs 6, 6 whose radius of curvature r of the receiving surfaces 7, 7 is larger than the radius of curvature R of the aperture grill welding surfaces 5, 5 of the supporting members 3, 3 are used. because,
With this arrangement, when the upper and lower edges of the aperture grill 1 are brought into contact with the support members 3 and 3, they first come into contact with each other at one point, and the contact areas spread from there to both sides.
This is because the support members 3 and 3 can be brought into contact with each other without a gap therebetween.

Normally, the holding jigs 6, 6 are appropriately spaced apart from the AG frame 2 on the front side (upper side in FIG. 4) of the AG frame 2, and further hold the aperture grille 1 while holding it from the front side. Move to the jig 6, 6 side,
As shown in (A), the crimping jigs 11 and 11 bring the aperture grill 1 (of which the peripherals 1a and 1a are) to the holding jigs 6 and 6 by crimping. So to speak, the upper and lower parts (periphery 1a, 1a) of the aperture grill 1 are attached to the crimping jig 1
It is in a state of being clamped by the holding jigs 1 and 11 and the holding jigs 6 and 6. Further, a predetermined weight f, f is applied to extend the wrinkles of the aperture grill 1. FIG. 2A shows the positional relationship between the aperture grill 1 and the support members 3 and 3 at that time.

Then, since the aperture grill 1 is thin and flexible, it bends along the receiving surfaces of the holding jigs 6, 6. The radius of curvature of the curved surface caused by the bending is inevitably
The radius of curvature r of the receiving surfaces 7, 7 of the holding jigs 6, 6 is the same. Then, the aperture grill 1, the crimping jigs 11, 1
1 and the holding jigs 6, 6 move integrally to the AG frame 2 side. Then, as shown in FIG. 2 (B), the upper and lower edges of the aperture grill 1 in a cylindrically warped state first come into contact with each other at the central portion P at one point. Further, when the movement continues, the contact area spreads from the point P to both sides,
Eventually, as shown in FIG. 2C, all the upper and lower edges of the aperture grill 1 to be welded are in complete contact with the support members 3 and 3 without any gap (non-contact portion) therebetween.

In the above contact state, welding is performed as shown in FIG. As described above, this welding is performed by the support member 3,
It is performed under the condition that the force F for 3 is applied. After welding, the holding jigs 6 and 6 and the crimping jig are moved, and then, as shown in FIG.
As shown in (C), the state in which the aperture grill 1 is clamped is released, and then the peripherals 1a, 1a of the aperture grill 1 are cut and removed. Then
As shown in FIG. 3 (D), an aperture grill 1 which is a color selection electrode element body and an AG frame 2 which is an electrode structure can form a color selection electrode device. A damper wire for pressing the grill tape of the aperture grill 1 to suppress the vibration later is attached to the elastic members 4 and 4 via a welded damper spring.

According to such a method, the holding jigs 6, 6 are
As the receiving surfaces 7, 7, the radius of curvature of which is smaller than that of the aperture grill welding surfaces 5, 5 of the supporting members 3, 3 is used, and the aperture grill 1 is first brought into contact with the supporting members 3, 3 at one point thereof. Since the entire contact area of the aperture grill 1 is brought into contact with the supporting members 3 and 3 of the AG frame 2 by expanding the contact area from one point thereof, the contact area is expanded to the inside by contacting from two points. Unlike the conventional case, wrinkles do not occur due to the length difference between the contact regions of the support members 3 and 3 and the contact region of the aperture grill 1. Therefore, the aperture grill 1 can be welded to the supporting members 3 and 3 without causing wrinkles, and there is no possibility of causing the problems as shown in FIGS. 5 and 6 which were caused by wrinkles.

Table 1 below shows the receiving surface 7 of the holding jig 6.
Of the wrinkle occurrence rate [%] on the surface of the aperture grill 1 and the difference r−R [mm] between the radius of curvature r of the support grille 3 and the curvature radius R of the aperture grill welding surface 7 of the support member 3 were obtained by experiments. It is a table showing the results.

[0026]

[Table 1]

From Table 1, it is proved that the wrinkle occurrence rate is considerably high if r <R (r-R <0), and the wrinkle occurrence rate is small if r≥R (r-R≥0). There is.

[0028]

According to the method of manufacturing a color selection electrode device for a color cathode ray tube of claim 1, the color selection electrode element is brought into contact with the support member at one point thereof, and the contact area is expanded from that point. Since the entire area to be welded of the color selection electrode assembly is brought into contact with the electrode assembly, the contact area of the support member and the color of the support member are colored as in the conventional case where the contact area is expanded from two points to the inside. There is no difference in length between the contact area of the selection electrode body and wrinkles. Therefore, the color selection electrode body can be welded to the support member without causing wrinkles, and there is no fear of the conventional problems as shown in FIGS. 5 and 6 which were caused by wrinkles.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining the outline of one embodiment of a method for manufacturing a color selection electrode device for a color cathode ray tube according to the present invention.

FIG. 2A to FIG. 2C are explanatory views of the main part of the above embodiment.

FIG. 3A to FIG. 3D are perspective views showing the above embodiment in detail.

FIG. 4 is a perspective view illustrating a conventional example.

5A and 5B are explanatory views of one problem of the conventional example, FIG. 5A is a front view, and FIG. 5B is an arrow view of FIG.

6A and 6B are explanatory views of other problems of the conventional example, FIG. 6A is a front view, and FIG. 6B is an arrow view of FIG.

[Explanation of symbols]

1 Aperture grill (color selection electrode body) 2 AG frame (electrode structure) 3 Support member 4 Elastic member 5 Support member aperture grill (color selection electrode body) Welding surface 6 Holding jig 7 Holding jig receiving surface R Support member aperture grille (color selection electrode body)
Curvature radius of welding surface r Curvature radius of receiving surface of holding jig

Claims (1)

[Claims] 1. A frame-shaped electrode in which upper and lower end edges of a color selection electrode body made of a metal plate in which a large number of vertically extending striped slits are arranged in parallel are held by upper and lower cylindrical support members by left and right elastic members. In the method of manufacturing a color selection electrode device for a color cathode ray tube, which is welded to the upper and lower support members of a structure, the upper and lower end edges of the color selection electrode body are first contacted with the cylindrical support member at one point to form a contact area. By expanding from one point, a state in which all of the upper and lower end edges to be welded are in contact with the supporting member is formed, and the welding is performed in this state. Production method