JPS62202439A - Manufacture of color selection mechanism for cathode-ray tube - Google Patents

Abstract

PURPOSE:To manufacture a color selection mechanism of high accuracy surely, by disposing a support frame around a pedestal for determining a curved surface, and selecting the portions of a thin metal plate for an electrode welded to the support frame, in a prescribed sequence. CONSTITUTION:A pedestal 9 functions to prevent such a fault that an electrode 4 goes off at the corner thereof from the support surface 5a of a frame 5, causing the welding of the electrode 4 to the support surface to be hindered or made impossible. In addition, since the welding of the electrode 4 to the support surface 5a is performed in such a sequence that the welding is started at the center of each side of the electrode and ended at the corners thereof, the looseness of a thin metal plate for the electrode 4 due to a certain torsion, if any, is transferred to the corners. For that reason, the electrode 4 can be attached to the frame 5 without being wrinkled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a color selection mechanism for a cathode ray tube such as a color television picture tube or a color display device.

[Summary of the invention]

In the present invention, a color selection mechanism is constructed by forming a color selection electrode, which is a fully bent thin plate with an electron beam transmission aperture, into a curved surface by simple bending and supporting it on a support frame.
A support frame is placed around the outer periphery of the pedestal that determines the curved surface,
By selecting the welding positions of the thin electrode metal plates relative to the support frame in a specified order, a highly accurate color sorting mechanism is reliably produced.

[Conventional technology]

In a color cathode ray tube, as shown in Fig. 1, which is a cross-sectional view of its main parts, the cathode ray tube body (1) consists of a panel part (IP), a funnel part (IF), and a neck part (IN).
). The panel part (IP) consists of a panel (2a) on which a color fluorescent surface (3) is adhered and formed, and a panel (2a) extending from its periphery toward the funnel part, the end face of which is fritted to the open end face of the funnel part (IF). The skirt part to be attached (
2b) are integrally molded. In this panel part (IP), an electron beam transmission aperture (4) is provided facing the color fluorescent surface (3) formed on the inner surface of the panel (2a).
a) is provided with a perforated color selection electrode (4), for example a shadow mask, which directs three electron beams R, G, B corresponding to each color, for example red, green and blue to a color fluorescent surface (3); The phosphor pattern is designed to land on a corresponding color phosphor pattern. (7) shows horizontal and vertical deflection means for electron beams R, G, and B.

This color selection electrode (4), for example, a shadow mask, is usually formed on a cold-rolled steel plate with a thickness of 0.08 to 0.035 wm by a photochemical method, that is, a photolithography technique, in a large number in the horizontal and vertical directions. A color-selecting electrode with an opening such as a circular hole or a long hole is formed, and this is pressed, or drawn, into a desired surface shape, that is, a shape that corresponds to the curved surface shape of the panel of the cathode ray tube body. ,
Generally, it is formed into a spherical shape. A color sorting mechanism (6) is constructed by explosively contacting its periphery onto a support frame (5).

However, in order to obtain color-selecting electrodes by pressing a metal plate in this way, an elongation of 1 to 3% is added during the press process, and this elongation causes damage to the metal plate, especially in the bridge portions between the openings. In order to prevent breakage, it is necessary to perform annealing at 850 to 950°C in a reducing atmosphere prior to press working, and the yield point elongation caused by this annealing is passed through the plate material using a roller leveler. The manufacturing process is extremely complicated because it requires removal work and press processing is performed after these works (Magazine Nitetsu to Hagane No. 67 (1981) No. 2, pp. 65-70). (see page)
.

Moreover, when using this method, the homogeneity of the material of the metal plate material itself becomes a problem. That is, if a component segregation part exists in this metal plate material, the amount of elongation will not be uniform during press working, causing a non-uniform shape change in the opening, and the transmittance of the electron beam will become non-uniform. The non-uniformity of the material of the metal plate material becomes apparent after the press working, that is, after many processes such as annealing and a leveling process have been carried out, resulting in a large loss of work. Furthermore, if the crystal grains are too large after annealing, electron beam transmittance unevenness will occur due to stretcher strain, so careful examination of the material loft is required.

Furthermore, in the case of this method, it is necessary to take into account in advance changes in the dimensions of the opening and the pitch due to the groaning of the material that occurs during press molding, and therefore there is a large element of instability. In addition, when designing this aperture, it is necessary to consider how to avoid moiré caused by interference between the so-called bridge part between the apertures and the scanning line. Taking shape changes into consideration also becomes complicated.

Furthermore, when designing the spherical surface of this color selection electrode, consideration must be given to its spring bank.

In other words, when a metal plate is drawn into a spherical shape by press working, the metal plate is deformed in a plastic region that exceeds its elastic limit, but after this plastic deformation, it undergoes elastic recovery, that is, a spring bank. arise. Therefore, for example, if we consider the case where press working is performed using a mold with a radius of curvature R, the radius of curvature of the electrode finally obtained will be R+ΔR, which is larger by 62 minutes. Therefore, in order to finally obtain an electrode having a curved surface with a radius of curvature R, it is necessary to correct the radius of curvature of the press mold in advance in anticipation of the above-mentioned springback. Generally, the mold is modified several times to press-mold an electrode having a surface with the desired curvature.

Modifying this mold is extremely troublesome, and the amount of springback changes depending on changes in the composition of the metal plate material, so it is extremely difficult and complicated to obtain a highly accurate color sorting mechanism with the desired dimensions and shape. It is.

On the other hand, the dot-like or stripe-like phosphor patterns of each color forming the color phosphor surface in a color cathode ray tube are required to be arranged as evenly as possible on the inner surface of the panel (2a) of the cathode ray tube. Accordingly, each of the beams R, G, and B is required to be sorted by a color sorting mechanism and landed in the form of a phosphor of a corresponding color. As is well known, in order to coat the inner surface of the panel (2a) with a fluorescent pattern of each color, a phosphor slurry containing a photosensitive binder is applied to the inner surface of the panel, and a color sorting mechanism A method is adopted in which the electron beam path is replaced by light, and the phosphor slurry of each color is sequentially optically printed using the actual color selection mechanism as an exposure mask.

As mentioned above, in order to obtain a proper state in which the phosphors of each color are arranged in an equal arrangement relationship, and therefore each electron beam R, G, and B is landed in an equal arrangement relation, the color selection electrode (4) is required.
and panel (2a) need to be set in a predetermined relationship.

In general, color cathode ray tube panels have either spherical or cylindrical surface shapes, and as mentioned above, the phosphor patterns of each color are arranged evenly. Therefore, in order to set the color selection electrode (4) and the panel (2a) in a proper relationship, if the color selection electrode (4) is spherical, the panel (2a) is also spherical. Further, when the color selection electrode (4) has a cylindrical surface, it is desirable to use a panel (2a) having a cylindrical surface in combination.

As the cylindrical color selection electrode (4), there is one in which the electron beam transmission aperture consists of slits extending over the entire area in the vertical direction of the effective screen, and the slits are arranged in parallel. In this case, without using the drawing process described above, the color selection electrodes having slits arranged therein are welded to the pair of frame sides curved along the cylindrical surface of the support frame at both ends of the extension of the slits. The color selection electrode is stretched under tension and curved into a cylindrical shape. With this configuration, the above-mentioned annealing process and leveling process associated with the drawing process can be avoided. However, since this is to maintain tension, the direction of tension is completely limited to an infinite radius of curvature, that is, a linear shape, and there is no degree of freedom in design.

Therefore, in this case, there are restrictions on the size and shape of the panel portion (IP) of the tube used in combination with this.

Next, to explain this, as mentioned above, the phosphor patterns of each color, in other words, the landing positions of the electron beams R1G and B on the panel (2a) corresponding to each color set by the color selection mechanism are , the other electrode (4) and the panel (2a) are arranged in an appropriate relationship in the panel (2a).
It is known that the appropriate distance LSG of each part with 2a) is given by: However, here So, three electron beams R, G, and B corresponding to red, green, and blue are arranged linearly on the horizontal line when viewed from the panel (2a> side, as shown in Figure 1. , the distance between the deflection centers Pc and Ps of the beam located at the center and the beams located on both sides, PG is the opening distance, and Ls is the distance between the deflection center Pc and the fluorescent surface (3). Ls and SD are values that change depending on the deflection of the electron beam.In other words, if the above equation (11) is satisfied over the entire area of the fluorescent surface (3), there will be three beams over the entire area of the fluorescent surface (3). The R, G, and B landing positions are properly placed.

Now, as shown in FIG. 11A, the landing positions LpR, LpG, L of each beam R, G, and B regulated by the aperture (4a) of the color selection electrode (4) on the fluorescent surface (3) are determined.
If the distance between the panel (2a) and the electrode (4) when pB shows a proper alignment is the relationship shown in Figure 11B, then the curvature of the panel (2a) is as shown in Figure 12B. When the radius is large, each landing position 1pR, LpG, LpB becomes a degrooving that widens at a part of the corner as shown in Figure 12A, and when the radius of curvature of the panel is small as shown in Figure 13, , excessive grooving occurs at some corners as shown in FIG. 13A.

Actually, the opening of the color selection electrode (4), that is, the slit (4)
a) Pitch PG, deflection angle, electron gun beam space,
There are some differences depending on the specifications of the deflection means (7), etc., but if you try to obtain a properly aligned striped phosphor pattern using the above-mentioned completely cylindrical color selection electrode, the panel (
For example, when the horizontal direction on the surface along the panel surface (2a) is the X-axis direction, the vertical direction is the y-axis direction, and the central axis is the two-axis direction, the shape of 2a) is Radius of curvature in direction Rpy.

And the radius of curvature Rpys of the outside of the wound located parallel to this is 1? pys< Rpyo...
Assuming the relationship (2), the radius of curvature Rpx in the X direction passing through the z-axis
o and the radius of curvature Rpxs on the outside of the wound located parallel to this
means that Rpxs< Rpxo”
...The relationship is as shown in (3).

[Problem that the invention seeks to solve]

As mentioned above, in the conventional method of obtaining a color selection mechanism, if the color selection electrode has a spherical shape, a complicated manufacturing process is required, and if the color selection electrode has a completely cylindrical surface, a phosphor pattern is required. In order to make the arrangement appropriate, there are problems such as the need for complicated adjustment or selection of the inner surface shape of the panel.

The present invention aims to eliminate or alleviate such problems and to realize a color selection mechanism with even higher accuracy.

[Means for solving problems]

As explained in FIG. 1, the present invention first has a thickness of 0.08 m in order to obtain a rectangular, ie, rectangular, color selection mechanism for selecting the landing position of an electron beam on a fluorescent surface.
On a thin cold rolled metal sheet with a thickness of m~O1, 35mm,
A plurality of electron beam transmission apertures are formed in a predetermined pattern in both the horizontal and vertical directions using a well-known high-precision technique such as photolithography (photoetching) to fabricate the color selection electrode (4). - As shown in Fig. 2 of the power cylinder, for example, the front end surface is the electrode support surface (5a), and the overall surface shape of the support surface (5a) is basically a cylindrical surface ( A frame (5) is provided, and a thin plate electrode (4) is mounted on the support surface (5a) of the frame (5) by simple bending within the elastic limit that does not produce a squeezing effect.
) and place it in a curved manner along the electrode support surface (5a). That is, the thin plate-shaped color selection electrode (4) is curved so that its basic surface shape is approximately cylindrical. Then, this electrode (4) is placed on the support surface (5a) of the frame (5).
Weld at the abutting part.

In this way, as shown in FIG. 3 as a perspective view, and as shown in FIGS. 4 and 5 as a front view and a sectional view taken along line A-A, A color selection mechanism (6) is obtained having a color selection electrode (4) whose basic surface shape is approximately cylindrical. Here, the basic surface shape is 1
In a direction such as the horizontal direction, the shape should have the required radius of curvature, but in other directions orthogonal to this, such as the vertical direction, the radius of curvature should be infinite or considerably larger than that in the horizontal direction. It refers to a shape that approximates a cylindrical surface as a whole, such as curved only at a part of the corner.

The apertures (4a) of the color selection electrodes (4) are formed into a plurality of long holes or circular holes in both the horizontal and vertical directions, thereby avoiding a slit shape that covers the entire area of the effective screen in one direction.

The present invention basically produces a color selection mechanism for a cathode ray tube using the method described above, but the present invention also uses a special method for welding the electrodes (4) to the support frame (5). Take. That is, in the present invention, a pedestal (9) is provided that determines the curved surface of the rectangular color selection electrode, and a support frame (5) is provided around the periphery of the pedestal (9). The pedestal (9) is attached to the central axis 2 of the color selection electrode (4) finally obtained as shown in Fig. 3.
A receiving surface (9a) with curved surfaces having respective radii of curvature Rxo and Ryo in the horizontal direction It consists of On the other hand, the supporting frame (
The support surface (5a) of 5) is on the same curved surface as required so as to extend in the X and Y directions passing through the above-mentioned central axis Z at least with the above-mentioned receiving surface (9a) of the pedestal (9). That is, the radii of curvature Rxo and Ry to be finally obtained.

be present on the surface that forms it. In this state, an electron beam transmission aperture is drilled in the cold-rolled thin metal plate across the receiving surface (9a) of the pedestal (9) and the supporting surface (5a) of the supporting frame (5) as described above. color selection electrode (4
) is placed in a curved manner along the curved surface formed by the receiving surface (9a) and the supporting surface (5a) formed by an extension surface thereof by bending within the elastic limit of this electrode material so as not to cause a drawing effect. . In this state, first, the color selection electrode (4
) are spot welded to the electrode support surface (5a) of the support frame (5) at the centers of the four long and short edges of the electrode. Thereafter, welding to the support surface (5a) is continued from these welding points toward the corners of the support frame (5).

[Effect]

As described above, in the present invention, the surface shape of the color selection electrode is processed by simple bending without drawing, so that all the problems associated with the drawing described at the beginning can be solved.

In particular, according to the present invention, when attaching the color selection electrodes (4) to the support frame (5),
) in which a pedestal (9) is provided to set the curved surface of the electrode (4), and in this case, some corners are left free without being set.
If there is some twist in the frame (5),
The electrode support surface (5a) generally maintains a predetermined shape in the X direction and Y direction passing through the central axis Z, but as it gets further away from these, that is, in a part of the corner, This tends to occur in the form of a slight displacement forward or backward, but even if such a slight twist exists, the electrode (4) may be bent over the frame (5) by, for example, the pedestal (9) at a part of the corner. It is avoided that the welding of the electrode (4) to the support surface (5a) becomes obstructed or impossible due to the electrode (4) floating up from the support surface (5a).

In addition, due to the procedure of welding the electrodes (4) to the support surface (5a) from the center of each side to a part of the corner, even if there is a slight twist as described above, the twist will not occur. As a result, the slack produced in the thin metal plate of the electrode (4) can be released to a part of the corner, so that the electrode (4) can be attached to the frame (5) without causing wrinkles.

Further, according to the manufacturing method of the present invention, the basic shape of the surface shape of the color selection electrode is a cylindrical surface, but it can be formed into a shape that is not limited to a completely cylindrical surface, so that it has an appropriate relationship with the panel (2a). The degree of freedom in design for setting the IP and therefore the degree of freedom in adjusting and selecting the shape of the panel portion (IP) increases.

〔Example〕

Cold rolled steel plates, such as rimmed steel plates and guild steel plates.

Alternatively, a thin metal plate such as an amber (36% Ni-balance Fe) plate is formed with elongated holes having a long sleeve direction in the vertical direction (X direction) using a well-known photolithography technique, for example, as shown in FIG. A plurality of electron beam transmission apertures (4a) are arranged vertically at a predetermined pitch p with a required interval wB.
y, and a plurality of rows are arranged in the horizontal direction (X direction) with a predetermined pitch PX.

In this case, the openings (4a) in adjacent rows are arranged so as to be on the threshold of each other, and the bridge portion (4a) between the openings (4a) in each row is
8) should not be arranged in the horizontal scanning line direction for all columns.

Meanwhile, a support frame (5) is prepared. As shown in FIG. 7, this support frame (5) can be formed into a ring shape with four integrated sides by press molding a metal steel plate, but in this case, in order to increase the strength, the electrode support surface (5a )
A flange portion (5b) that bends and projects inward on the opposite side is integrally molded.

The flange portion (5b) inside this support frame (5)
), as shown in FIG. 8, the pedestal (9) having the receiving surface (9a) described in FIG. 2 is inserted and arranged.

As shown in FIG. 9, this pedestal (9) has a surface having a radius of curvature R of 0 and Rxy in the X direction and Y direction passing through the central axis Z, respectively, and does not reach a part of the corner. It has a receiving surface (9a) in a narrow cross pattern.

Then, the color selection electrode (4) is placed across the receiving surface (9a) of the pedestal (9) and the electrode supporting surface (5a) of the supporting frame (5).
) Place it on top. In this way, the electrode (4) is moved from above by its own weight to the receiving surface (9a) of the pedestal (9).
and curved along the curved surface of the end surface (5a) of the frame (5), or furthermore, a concave curved surface (
By pressing the holding jig (11) having the holding jig (10a) toward the pedestal (9), the electrode (4) is bent within its elastic limit so as to follow the support surface (5a) of the frame (5).

In that state, the electrode (4) is attached to its support frame (5),
The electrode support surface (5a) is welded at the joint (F). As shown in FIG. ~ Spot weld to P4, then each of these points 2
The welding points are moved outward from points P5 to P12 outside points P5 to P12, respectively, and finally welding is completed at points PC1 to PC4, which are part of each corner.

The curved surface formed by bending the color selection electrode (4), that is, the surface shape of the end surface (5a) of the support frame (5), can be a completely cylindrical surface, but as shown in FIG. The radius of curvature (hereinafter referred to as the radius of curvature in the Y direction) in a cross section (Z-Y plane) that includes Z and the vertical direction (Y direction) is the (Z-X plane) that includes the central axis Z and the horizontal direction (X direction). (hereinafter referred to as the radius of curvature in the
When Rxo and Rxs, Ryo>Rys> R
xo>Rxs.

In other words, considering the panel (2a) of a cathode ray tube, this panel (2a) has a vertical (X direction) radius of curvature Rpy in order to avoid the influence of external light, especially indoor ceiling lighting, on the screen. is the horizontal (X direction) radius of curvature Rp
It is desirable that the basic shape is a cylindrical surface, for example, a complete cylindrical surface, which is larger than x as much as possible. Now, a cylindrical panel (
Considering 2a), if this panel (2a) is a perfect cylindrical surface, the panel (2a) shown in FIG.
The height h of the arc on the x-z plane can be expressed as h=Rpy-fiπ97 (5), where the lengths of each part in the X and X directions are 1x and ly. Also, the shape h = Rpx + R close to a cylindrical surface
The following can be considered. However, in both cases, Rpy>Rpx.

The above formulas (61, (7), (81) have a so-called barrel-shaped surface shape. Generally, the shapes of formulas (5) to (8) are used as the surface shape of the panel (2a). In large cathode ray tubes, in consideration of the fact that the panel (2a) will be deformed by external pressure when the inside of the tube is evacuated, the panel (2a) should be designed so that its outer surface does not become convex toward the inside of the cathode ray tube after the tube is evacuated. The radius of curvature Rpy is given.In addition, regarding the inner surface of the panel (2a), the glass thickness of the panel (2a) is molded so that it becomes thicker from the center to the periphery, taking into consideration the strength of the pipe body after evacuation. The radius of curvature in each direction on the inner surface of the panel is selected to be slightly smaller than that on the outer surface.The shape of the inner surface of the panel (2a) is determined by the characteristics of the deflection means (7), etc. It is sometimes considered to be a bilobal hyperboloid.

In this way, the panel (2a) of the actual panel part (IP) often does not have a perfect cylindrical shape due to various circumstances, and for this reason, the arrangement of the phosphor backs of each color is uniform in each part. In this case, the surface shape of the color selection electrode (4) is selected according to the surface shape of the panel (2a), and it is appropriate to change the curvature in each of the X and Y directions without taking a completely cylindrical surface. It may happen.

In fact, in the manufacturing process of cathode ray tubes, for example, in the process of blackening the color selection mechanism, or in the frit sealing process of joining the panel part (IP) and the funnel part (IF>), the color selection mechanism also uses 430~ When heat of about 480'C is applied, recrystallization occurs in the thin metal plate of the color selection electrode.
This may cause deformation of the color selection electrodes in the finally completed cathode ray tube. Therefore, it is desirable to heat the thin metal plate at a temperature of about 480° C., which is the highest heating temperature applied to the thin metal plate, or a temperature much higher than this before fabricating and processing the color selection electrode. However, even in this case, since the heating temperature is different from the high-temperature heating of 850 to 950°C for annealing mentioned at the beginning, the leveler treatment required after this high-temperature heating is not necessary. .

〔Effect of the invention〕

As described above, according to the manufacturing method of the present invention, the surface shape of the electrode (4) of the color sorting mechanism (6) is formed by a simple bending process within the elastic limit, so the various aspects of the conventional press process described in WHI are avoided. You can solve all your problems. In other words, for example, high-temperature heat treatment for annealing, leveler treatment, etc. are no longer necessary.
The manufacturing process is simplified, and problems such as the occurrence of defective products and reliability problems due to component segregation associated with this press processing are avoided. In addition, by avoiding the drawing process by pressing, that is, by not giving elongation to the electrode material, the distance between the openings (4a) explained in FIG. This can be made as small as about /2, and thereby, depending on the distance between the color selection electrode and the panel, it is possible to avoid a shadow caused by this bridge portion on the screen. In addition, since the pitch py can be made larger than the conventional one, the problem of moire with the scanning line is also improved.
SC, PAL.

Due to the differences in broadcasting systems such as SECAM, the inconvenience of having different color sorting mechanisms built in depending on the destination can be avoided by making it possible to apply a common color sorting mechanism, allowing for greater mass production and lower costs. It is possible to reduce the

Furthermore, in a color cathode ray tube, the total area of the color selection electrode aperture is around 20%, and most of the electron beam that passes through the aperture during electron beam scanning is converted into light that collides with the phosphor. , the remaining 80% or so of the electron beam collides with the color selection electrode, and most of it is converted into heat. At this time, thermal expansion occurs in the electrode, causing elongation (doming). In this case, a deviation in the trajectory of the electron beam (mislanding) occurs.

This is an unavoidable phenomenon in a color selection electrode made of a steel plate or thin metal plate that has been heat-treated at a high temperature, that is, has been annealed, and is press-molded into a spherical shape. However, cold-rolled thin metal sheets are in a work-hardened state as they are, that is, they have residual stress and have high deformation resistance. In the case of the color selection mechanism, even if the temperature of the color selection electrode increases during operation of the cathode ray tube, the amount of deformation is smaller than that of conventional annealed and press-molded electrodes, thus providing a cathode ray tube with less mislanding. It is possible.

Furthermore, in the present invention, when attaching the electrode (4) to the support frame (5), the support frame (91) is used, and the limitation of the curved surface setting position, welding procedure, etc. are specified. Even if there is a slight twist in the electrode (4), the electrode (4) can be attached reliably without causing wrinkles, so a more accurate color selection mechanism can be obtained, and even higher quality color cathode rays can be produced. You can get the tube.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a cathode ray tube used to explain the present invention;
The figure is a sectional view in one step of the manufacturing method of the present invention, FIG. 3 is a perspective view of the color sorting mechanism according to the manufacturing method of the present invention, FIG. 4 is a front view thereof, and FIG. 6 is a pattern diagram of an example of a color selection electrode in the manufacturing method of the present invention, FIG. 7 is a perspective view of an example of a support frame, and FIG. 8 is a state in which a pedestal is fitted to the support frame. FIG. 9 is a perspective view of the cradle, FIG. 10 is an explanatory view of the panel, and FIG. 11 is a perspective view of the cradle.
figure. 12 and 13 are front views showing the beam landing of the cathode ray tube, and each drawing B in FIGS. 12 and 13 is a schematic side view showing the relationship between the panel section of the cathode ray tube and the color selection mechanism. (IP) is the panel part, (2a) is the panel, (3) is the fluorescent surface, (6) is the color selection mechanism, (4) is the color selection electrode, (
4a) is its opening, (5) is its support frame, (5a) is its electrode support surface, (9) is its pedestal, and (9a) is its receiving surface.

Claims (1)

[Claims] A support frame for supporting the color selection electrode is arranged around the outer periphery of a pedestal that determines the curved surface of the square color selection electrode, and cooling is applied across the support surface of the color selection electrode of the support frame and the pedestal. A color-selecting electrode made of a thin rolled metal plate with an electron beam transmission aperture is bent along the above-mentioned curved surface by bending within the elastic limit of the electrode material so as not to produce a drawing effect. In this state, the centers of the four long and short edges of the color-selecting electrode are spot-welded to the support surface of the support frame, and then the colors are welded from these welding points to the corners of the support frame. A method for manufacturing a color sorting mechanism for a cathode ray tube, characterized in that welding of a sorting electrode to the supporting surface of the supporting frame is progressing.