JP2000215802A - Color-selecting electrode system and manufacture thereof and color cathode-ray tube and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color-selecting electrode system wherein a compressive load is uniformly loaded on a frame body to which fine electrode bodies of a structural body for the color-selecting electrodes is mounted, and a manufacturing method therefor, and color cathode-ray tube provided with the color-selecting electrode system, and a manufacturing method therefor. SOLUTION: A color-selecting electrode system is provided with a structural body 6 for the color-selecting electrodes formed of a plenty of fine electrode bodies 6a and a nearly rectangular frame body 7, and which is formed in such a way that tension is a pplied by a restoring force of the frame body 7 loaded a compressive loading in the fine electrode bodies 6a of the structural body 6 for the color-selecting electrodes, and where in a metal made block 8 having a hardness of HRC 60 or more and to which the compressive load is loaded is disposed on the frame body 7. The color-electrode system 5 is manufactured as a pressurizing point when the compressive load is loaded on the metal block 8 by means of a pressurizing jig.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection electrode device having a slit-shaped opening, a method of manufacturing the same, a color cathode ray tube having the color selection electrode device, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a color cathode ray tube, red,
An electron gun that emits three electron beams corresponding to each color of green and blue, and red, green, and
A phosphor screen on which a blue phosphor stripe is formed, comprising a color selection electrode device disposed to face the phosphor screen,
A so-called single electron gun three-beam type color cathode ray tube is known. In a color cathode ray tube, a so-called aperture grill has been proposed, in which a color selection electrode assembly in which a slit-shaped opening is formed by a stripe-shaped color selection electrode strip is used as a color selection electrode device to be provided. I have.

In the above-mentioned color cathode ray tube, after three electron beams emitted from an electron gun are prefocused, the main focus is focused on a main lens unit and focused on a central axis, and then a convergence polarizer is used. After passing through a slit-shaped opening of the color selection electrode device. The electron beam is color-selected at the aperture of the color-selecting electrode device and strikes red, green, and blue phosphor stripes formed on the phosphor screen to emit three primary colors.

A conventional color selection electrode device 50 is, for example, shown in FIG.
As shown in FIG. 10, a color selection electrode assembly 51 is welded to a frame 52 composed of a frame member 52a and an arm member 52b. In addition, the color selection electrode device 50 has both ends welded to the damper ridge 53 and a damper wire 54 that suppresses resonance due to shock and vibration from the outside of the electrode strip 51a, and protrudes into the glass bulb inner surface of the color cathode ray tube. An emission support plate 56 to which an emission 55 held by a pin is attached, and an STC (Self thermal comp.) For compensating for the color purity deterioration of the electron beam caused by thermal expansion.
(encoder) 57 and the like. The color selection electrode device 50 is mounted in a glass bulb of a color cathode ray tube (not shown).

[0005] In the above-described color selection electrode device 50, the electrode strip 51a is interposed between the frame members 52a by welding the welding plate portion 51b of the color selection electrode assembly 51 to the frame 52 assembled in a substantially rectangular shape. It is manufactured by being stretched. In particular,
As shown in FIG. 11, the color selection electrode device 50 includes a frame 52
When the and the color selection electrode assembly 51 are welded, they are set on the pressing jig 60 and the assembly holding jig 70, respectively.

The pressing jig 60 includes a frame member 52 a of the frame 52.
A compressive load is applied to. The pressing jig 60 is shown in FIG.
As shown in the figure, one pressing arm 61a is connected to one frame member 52.
a, and the other pressing arm 61b is connected to another frame member 52a.
Is pressed in the direction of arrow C in FIG. The pressing element 62 provided on the pressing holding block 63 of the pressing arms 61a and 61b contacts the pressing jig 60 and presses the frame member 52a. The pressing jig 60 is, as shown in FIG.
The pressure holding block 63 rotates around the groove 64 as a fulcrum so as to follow the shape of 2a, and slightly moves while sliding in the center of the frame 52, that is, in the direction of arrow D in FIG. A compressive load is applied to the central part.

[0007] The color selection electrode device 50 includes a color selection electrode assembly 5.
After welding of the frame 1 and the frame 52, the structure holding jig 70 and the pressing jig 60 are respectively removed. Color sorting electrode device 5
0 indicates that when the compressive load on the frame 52 is removed, FIG.
Appropriate tension is applied to the electrode strip 51a by the restoring force of the frame 52 compressed in the direction of the middle arrow C.

[0008] As described above, the color selection electrode device 50 applies resonance to the electrode strip 51a due to vibration and impact from outside the color cathode ray tube by applying an appropriate tension to the electrode strip 51a. Suppress color shift on the display screen.

The color selection electrode device 50 is used as a mask at the time of exposure when forming red, green and blue phosphor stripes on the phosphor screen of the above-mentioned color cathode ray tube. That is, as shown in FIG. 14, the color selection electrode device 50 passes the exposure light 80 through the slit-shaped opening 58 formed in the electrode thin body 51 a of the color selection electrode assembly 51, thereby forming the inner surface of the panel portion 81. The phosphor stripe 82 (8
2R, 82G, and 82B) are formed to be the fluorescent screen 83.

[0010]

However, in the color selecting electrode device 50, the pressing arm portion 61a is provided with the frame member 52.
A phenomenon that the frame member 52a is not uniformly pressurized when the operation speed for pressurizing a, for example, the operation speed of the hydraulic device 65 or the compressed air pressure device 66 serving as the drive source of the pressurizing device shown in FIG. Had occurred.

More specifically, when the pressing operation is relatively slow, the presser 62 moves slightly while sliding toward the center of the frame 52 when the pressing operation is relatively slow. A sufficient compressive load is also applied to the central portion of.

However, when the pressing operation is relatively fast, the color selection electrode device 50 has a frame member 52a as shown in FIG. 15 so as not to cause significant wear between the color selection electrode device 50 and the color selection electrode device 50.
The pressurizing element 62 formed to have a hardness twice or three times that of the pressing member 62 bites into the frame member 52a. When the presser 62 bites, the color selection electrode device 50 has a tension distribution a when slippage occurs between the presser 62 and the frame member 52a as shown in FIG.
In comparison with the above, a tension distribution b in which the tension at the center decreases and the tension at the periphery increases.

As shown in FIG. 17, in the case of the tension distribution a in FIG. 16, the color selection electrode device 50 uses three electron beams 84 (84R, 84G, 84B) to emit phosphor stripes 82 (84R, 84G, 84B) corresponding to each color. 82R, 82G, 82B) is formed on the phosphor screen 83.

On the other hand, in the color selection electrode device 50, in the case of the tension distribution b in FIG. 16, the central electrode strip 51a having a reduced tension is subjected to vibration from outside the color cathode ray tube as shown in FIG. , It is easy to vibrate in resonance with the shock. As shown in FIG. 19, the color selecting electrode device 50
When 1a vibrates, its position is displaced, and the width and position of the opening 58 are changed. For this reason, the color selection electrode device 50 is configured such that the three electron beams 84 emitted from the electron gun are not fixed at one place, and the predetermined phosphor stripe 84 and the phosphor stripe 84 of another color or the carbon stripe 85 A phenomenon occurs in which the operation of moving between is repeated. In such a case, the color cathode ray tube has a problem that the display screen is disturbed and the high definition image quality is significantly deteriorated.

In the color selection electrode device 50, when the tension distribution b in FIG.
5 and the frame body 5 due to variations in the operation of the compressed air pressure device 66.
When the pressing operation on 2a is accelerated, the electrode thin body 51a
The tension of the peripheral part increases. For this reason, in the color selection electrode device 50, the electrode strips 51a at both ends are twisted,
As shown in FIG. 20, when the fluorescent screen 83 is used as a mask for exposure formation, the interval between the openings 58 through which the exposure light 80 passes is disturbed. In the color cathode ray tube, when the color selection electrode device 50 in which the distance between the openings 58 is disturbed is used, the distance between the arbitrary arbitrary phosphor stripes 82 shown in FIG.
As shown in FIG. 0, the width dimensions vary and are not equal. In such a case, in the color cathode ray tube, a plurality of vertical streak-like color unevenness occurs at both ends of the display screen, causing problems such as deteriorating the image quality of the color cathode ray tube.

Accordingly, the present invention provides a color selection electrode device in which a compressive load is uniformly applied to a frame on which an electrode strip of a color selection electrode structure is stretched, a method of manufacturing the color selection electrode device, and a color selection electrode device. An object of the present invention is to provide a color cathode ray tube provided with an electrode device and a method of manufacturing the color cathode ray tube.

[0017]

According to a first aspect of the present invention, there is provided a color-selecting electrode device comprising a color-selecting electrode assembly formed with a plurality of electrode strips and a substantially rectangular frame. At the same time, the electrode strip of the color selection electrode assembly is stretched over a frame to which a compressive load is applied, tension is applied by the restoring force of the frame, and the frame has a hardness of HRC60 or more, and is compressed. A metal pressurized member to which a load is applied is provided.

Further, the method for manufacturing a color selection electrode device according to the present invention is characterized in that a color selection electrode assembly having a large number of electrode strips is stretched over a frame to which a compressive load is applied. The hardness, which is the pressure point when a compressive load is applied to the frame, is HR
A pressurized member made of metal of C60 or more is provided, and the pressurized member is manufactured by applying a compressive load.

The color cathode ray tube and the method for manufacturing the same according to the present invention are provided with the color selection electrode device manufactured through the above-described steps.

According to the color selection electrode device and the method for manufacturing the color selection electrode device of the present invention, by providing a metal pressurized member having a hardness of HRC60 or more at a press point for pressing the frame, Even when the pressing operation in which a compressive load is applied to the frame is relatively fast, the compressive load is applied evenly to the center of the frame without the pressing member such as the pressurizer biting. Is done.

Further, according to the color cathode ray tube and the method for manufacturing a color cathode ray tube according to the present invention, the color selection electrode device to which the compressive load is uniformly applied is attached to the frame.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a color selection electrode device, a method of manufacturing a color selection electrode device, a color cathode ray tube, and a method of manufacturing a color cathode ray tube according to the present invention will be described with reference to the drawings. This will be described in detail.

The color cathode ray tube 1 according to the present embodiment
As shown in FIG. 1, the neck 2a and the funnel 2
b, a glass bulb 2 composed of a panel portion 2c, an electron gun 3 disposed without the neck portion 2a, a fluorescent surface 4 formed on the inner surface of the panel portion 2c, and disposed facing the fluorescent surface 4. And a color selection electrode device 5. The electron gun 3 emits three electron beams corresponding to red, green, and blue colors to the phosphor screen 4. On the phosphor screen 4,
Phosphor stripes corresponding to each of the red, green, and blue colors reached by the above-described electron beam are formed. The color cathode ray tube 1 includes, for example, a polarizer, although not shown, in addition to the above-described configuration.

The color selection electrode device 5 performs color selection of the electron beam emitted toward the phosphor screen 4. As shown in FIG. 2, the color selection electrode device 5 includes a color selection electrode assembly 6 and a frame 7 that supports the color selection electrode assembly 6.

The color selection electrode assembly 6 is composed of a plurality of electrode strips 6a formed on a thin metal plate such as mild steel, and a welding plate 6b for supporting the electrode strips 6a. A predetermined tension is applied to the electrode strip 6a by stretching the color selection electrode assembly 6 around the frame 7. The welding plate portion 6b is formed in a substantially rectangular frame shape, and the electrode strip 6 is formed.
a at both ends in the longitudinal direction.

The color selecting electrode assembly 6 is formed with a plurality of electrode strips 6a, both ends of which are supported by a welding plate 6b, so that a plurality of slit-shaped strips are formed between the electrode strips 6a. An opening is formed.

The frame 7 is composed of a pair of frame members 7a and a pair of arm members 7b. One end and the other end of a pair of frame members 7a arranged in parallel at a predetermined interval. And the arm members 7b are welded,
Assembled in a substantially rectangular frame shape. The frame 7 has a welding plate 6b of the color selection electrode assembly 2 welded to a surface of the frame member 7a opposite to the surface to which the arm member 7b is welded.

The pair of frame members 7a are formed to have a substantially L-shaped cross section, and are curved with respect to the outside of the frame-like frame 7 (hereinafter, simply used as "outward"). The arm member 7b is formed so as to be curved on the opposite side to the side to which the arm member 7b is welded, that is, upwardly in FIG. 2 (hereinafter, simply referred to as "upward"). Arm member 7b
Are formed in a substantially U-shape.

The frame 7 is provided with a metal block 8 on a surface perpendicular to the surface of the frame member 7a to which the color selection electrode assembly 6 is welded. The metal block 8 is, as shown in FIG.
It is provided near each of both ends of the pair of frame members 7a, and serves as a pressure point where a compressive load is applied in a manufacturing process described later. The metal block 8 has a hardness of HRC60 or more, and does not cause the pressurizing element 22 of the pressurizing jig 20 described later to bite even when the metal block 8 is at the pressing point.

As shown in FIG. 3, the metal block 8 is fitted in a recess 9 formed in advance in the frame member 7a, and is attached by, for example, screwing with a bolt 10 and a nut 11. The metal block 8 is not limited to the above-described fixing by screwing. For example, as shown in FIG.
After fitting in the concave portion 9 formed in the frame member 7a, the frame member 7a may be attached by welding, or may be attached by an attachment method such as embedded fixing.

Hereinafter, a method of manufacturing the color cathode ray tube 1 having the above-described configuration and a method of manufacturing the color selection electrode device 5 provided in the color cathode ray tube 1 will be described.

The color cathode ray tube 1 is manufactured by arranging an electron gun 3 and a color selection electrode device 5 on a glass bulb 2 evacuated and evacuated to form a fluorescent screen 4.

First, a method of manufacturing the color selection electrode device 1 disposed in the color cathode ray tube 1 and used as a mask at the time of exposure when forming the fluorescent screen 4 will be described.

In the color selection electrode device 5, a color selection electrode structure 6 on which an electrode strip 6a is formed is manufactured. The color selection electrode assembly 6 is formed by performing an etching process using a photoresist patterned on a thin metal plate such as mild steel as a mask, thereby forming electrode strips 6a and slits between the electrode strips 6a. An opening is formed. In addition, a frame-like welding plate portion 6b is formed on the color selection electrode assembly 6 so as to surround the plurality of electrode strips 6a.

Next, the color selection electrode device 5 is formed into a substantially rectangular frame shape by welding a pair of arm members 7b to both ends of a pair of frame members 7a arranged in parallel at a predetermined interval. The frame 7 to be formed is assembled.

Finally, the color selection electrode device 5 is manufactured by welding the color selection electrode structure 6 and the frame 7 manufactured as described above. The color selection electrode device 5 includes a color selection electrode structure 6.
5 is welded to the frame 7, as shown in FIGS. 5 and 6, the arm member 7 a curved outward by the pressurizing device 20 is applied to the frame 7 on the inner side, that is, a pair of frames. Arrow A in FIGS. 5 and 6 toward the direction in which the interval between the members 7a is reduced.
A compressive load is applied in the direction.

As shown in FIGS. 5 and 6, the pressurizing device 20 is a first pressurizing device that contacts and supports one of the frame members 7a of the frame 3.
5A and the other frame member 7a of the frame body 7 in FIG.
And a second pressing arm 21b pressing in the direction of arrow A in FIG.
And is provided. The pressurizing device 20 includes a second pressurizing arm 2 using a compressed air pressure device and a hydraulic device (not shown).
1b is the first pressing arm 21a side, that is, FIGS.
It is moved in the direction of the middle arrow A.

A pressure holding block 23 provided with a pressure element 22 is attached to each of the first pressure arm 21a and the second pressure arm 21b near both ends. First pressing arm 21a and second pressing arm 21b
Is formed in a slightly curved shape similar to the shape of the curved frame member 7a, and both end portions on which the pressure holding block 23 is provided are inclined inside the central portion, that is, on the side where the frame body 7 is disposed. It is formed.

The pressure holding block 23 is rotatably attached to grooves 24 formed in the first pressure arm 21a and the second pressure arm 21b, respectively. The pressure holding block 23 has a top portion 23a fitted in the groove 24 of the first pressing arm portion 21a and the second pressing arm portion 21b, and a pressing element 22 on a pressing surface 23b facing the top portion 23a. Installed. The pressurizing element 22 is connected to the frame member 7 of the frame 7.
In addition to applying a compressive load to the frame body 7 by contacting the metal block 8 attached to the metal block b, the contact surface with the metal block 8 is formed into a smooth curved surface.

As shown in FIG. 7, the pressurizing device 20
When the pressing arm 21b moves in the direction of the arrow A in the figure and the pressing element 22 contacts the upper surface of the metal block 8 provided on the frame member 7a, which is a pressing point, the pressing holding block 23 It is rotated so as to follow the shape of 7a. Then, when the second pressing arm portion 21b is further moved in the direction of arrow A in the drawing and the pressing is advanced, the pressing device 22 moves the pressing member 22 toward the center of the frame member 7a, that is, in the drawing. The slider 7 slightly moves while sliding in the direction of the middle arrow B, and applies a compressive load in the direction of the arrow A to the center of the frame member 7a.

As described above, the pressing device 20 includes the pressing element 22
Since the pressing point with which the contact is made is on the metal block 8 having a hardness of HRC60 or more and being harder than the pressing element 22, even if the pressing operation varies and becomes relatively fast, the pressing element Since slight movement occurs between the frame member 7a and the frame member 7a so as to slide toward the center side of the frame member 7a, phenomena such as biting of the pressurizer 22 do not occur. Therefore, in the color selection electrode device 5, the central portion and the end portion of the frame 7 can be uniformly pressed even by a relatively fast pressing operation.

In the color selection electrode device 5, the frame 7 is pressed against the pair of frame members 7a by the pressing jig 20 having the above-described structure, and the color selection electrode Welding is performed.

As shown in FIG. 8 (a), the color selection electrode assembly 5 is configured such that the color selection electrode assembly 6 curved along the curvature of the upwardly curved frame member 7 a is fixed to the frame 7 by the fixing jig 30.
Placed on top and welded. The fixing jig 30 includes a pair of supporting members 31a and 31b and a pair of pressing members 32a and 32.
b and sandwiches a metal sheet on which the electrode strips 6a are formed.

As shown in FIG. 8B, after the welding of the color selection electrode structure 6 and the frame member 7 is completed, the fixing jig 20 is moved from the color selection electrode structure 6 to the frame body 7 as shown in FIG. The pressing jig 20 is removed from, and the pressing on the frame member 7a is released. The color selection electrode device 5 is stretched between the frame members 7a as a result of the color selection electrode assembly 6 being welded to the frame 7 by the force for releasing the pressurization to the frame 7 and returning to the natural state. The tension is applied to the electrode strip 6a.

As described above, the color selecting electrode device 5 has a hardness HRC which is higher than that of the pressing element 22 when the pressing by the pressing device 20 is performed.
Since the metal block 8 of 60 or more is used as a pressure point, the electrode strip 6a is stretched on the frame 7 with a constant tension.

In the color selection electrode device 1, an extra thin metal plate remaining outside the frame 7 is cut, and the color selection electrode structure 6 is cut into a predetermined shape. In addition, the color selection electrode device 5 has S for compensating for the color purity deterioration of the electron beam due to thermal expansion.
A TC, a damper wire or the like which is stretched in a direction orthogonal to the electrode strip 2a and suppresses color shift due to resonance of the electrode strip 6a is provided. Further, the color selection electrode device 5 is manufactured by performing a blackening process that passes through a hot gas furnace, a heat treatment that removes processing distortion, and the like.

Thereafter, an electron gun 3 (not shown) is assembled and disposed on the neck 2a of the glass bulb 2. Further, the fluorescent screen 4 is formed on the inner surface of the panel portion 2c using the color selecting electrode device 5 manufactured as described above, and the color selecting electrode device 5 is disposed to face the fluorescent screen 4.
The color cathode ray tube 1 is manufactured by welding the neck portion 2a, the funnel portion 2b, and the panel portion 2c of the glass bulb 2 and evacuating the inside to produce a vacuum.

[0048]

As described above in detail, the color selection electrode device, the method for manufacturing the same, the color cathode ray tube and the method for manufacturing the same according to the present invention provide a compression load when welding the color selection electrode assembly to the frame. Is provided with a metal block having a hardness of HRC60 or more on a frame member of the frame body to be loaded, and this metal block is set as a pressing point when pressed by a pressurizing element of a pressing jig. Is relatively fast, slippage occurs between the frame member of the frame and the pressurizing element. Therefore, according to the color selection electrode device, the method for manufacturing the same, the color cathode ray tube, and the method for manufacturing the same according to the present invention, a compressive load can be uniformly applied even when the pressing operation on the frame is relatively fast.

[Brief description of the drawings]

FIG. 1 is a sectional view of a color cathode ray tube.

FIG. 2 is a perspective view of a color selection structure.

FIG. 3 is a sectional view of a main part of a frame member for explaining a method of attaching a metal block.

FIG. 4 is a sectional view of a main part of a frame member for explaining another method of attaching a metal block.

FIG. 5 is a perspective view showing a state of a frame installed on the pressing jig.

FIG. 6 is a plan view showing a state of a frame installed on the pressing jig.

FIG. 7 is an enlarged view of a main part showing a state of a frame pressed by a pressing jig.

FIG. 8A is a perspective view showing a state in which a thin metal plate sandwiched between fixing jigs is arranged on a frame, and FIG.
FIG. 4 is a perspective view showing a state in which a fixing jig is removed from a thin metal plate.

FIG. 9 is a perspective view showing a state before assembly of a conventional color selection electrode device.

FIG. 10 is a perspective view of the same color selection electrode device.

FIG. 11 is a perspective view showing a state in which the same-color selection electrode device is assembled using a pressing jig and a structure holding jig.

FIG. 12 is a plan view showing a state in which a conventional frame is set on a pressing jig.

FIG. 13 is an enlarged view of a main part showing a state where the frame is pressed by a pressing jig.

FIG. 14 is an enlarged cross-sectional view of a main part illustrating a state where the color selection electrode device is used as a mask when exposing a phosphor stripe.

FIG. 15 is an enlarged view of a main part showing a state where the frame is pressed by a pressing jig.

FIG. 16 is a characteristic diagram showing a tension distribution of an electrode strip of a conventional color selection electrode device.

FIG. 17 is an enlarged sectional view of a main part for explaining a state in which an electron beam emitted from an electron gun passes through a color selection electrode device.

FIG. 18 is a longitudinal sectional view showing a state where an electrode strip of the same color selection electrode device is vibrating.

FIG. 19 is an enlarged longitudinal sectional view of a main part showing a state where the same color selection electrode device is arranged in a color cathode ray tube.

FIG. 20 is an enlarged vertical sectional view of a main part showing a state where the same color selection electrode device is used as a mask when forming a fluorescent stripe.

[Explanation of symbols]

1 color cathode ray tube, 2 glass bulb, 3 electron gun,
4 phosphor screen, 5 color selection electrode device, 6 color selection electrode structure, 6a electrode strip, 6b welding plate, 7 frame,
8 metal block, 9 concave part, 20 pressing jig, 30
Holding jig

Claims (4)

[Claims] 1. A color selection electrode device comprising a color selection electrode assembly having a plurality of electrode strips formed thereon and a substantially rectangular frame, wherein the electrode strip of the color selection electrode assembly comprises: While being stretched over the frame body to which the compressive load is applied, tension is applied by the restoring force of the frame body, and the frame body has a hardness of HRC60 or more and is made of a metal to which a compressive load is applied. A color selecting electrode device comprising a member to be pressed. 2. A method for manufacturing a color selection electrode device in which a color selection electrode structure having a plurality of electrode strips formed thereon is stretched over a frame to which a compression load is applied. A pressed member made of a metal having a hardness of HRC60 or more provided as a pressing point to be loaded is provided,
A method for manufacturing a color selection electrode device, wherein a compression load is applied to the member to be pressed. 3. A color cathode ray tube provided with a color selection electrode device having a color selection electrode structure having a plurality of electrode strips formed thereon and a substantially rectangular frame, wherein the color selection electrode device is provided. A color cathode ray tube, characterized in that a metal pressurized member having a hardness of HRC60 or more and a compressive load is provided on the frame body. 4. A method for manufacturing a color cathode ray tube to which a color selection electrode device manufactured through a color selection electrode device assembly process is attached, wherein the color selection electrode device assembly process includes the step of setting the hardness of the HRC60 provided on the frame body. A compressive load is applied to the metal pressurized member, and a color selection electrode assembly in which a large number of electrode strips are formed on the frame is stretched, connected and assembled. To manufacture a color cathode ray tube.