JPH08171867A - Color selecting mechanism and manufacture of it - Google Patents

Abstract

PURPOSE: To provide the specified supporting stress to an aperture grill of a color selecting mechanism of a cathode-ray tube without compressing a frame and without heating the aperture grill. CONSTITUTION: Suspending stress adjusting parts 18 are inserted between the surface of a frame 9 for supporting an aperture grill 1 and the aperture grill. A protrusion or a groove for fixing the aperture grill may be provided on the supporting surface of the frame. The distribution is provided on the depth of the groove, and the distribution is provided on the distance from the groove or the protrusion to the fixed part of the aperture grill, and therefore, the distribution is provided on the stretching stress.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection mechanism in which an aperture grill used for color selection of a cathode ray tube of a color television picture tube, a color display device or the like is properly stretched and fixed to a frame, and a manufacturing method thereof. is there.

[0002]

2. Description of the Related Art A color cathode ray tube (CRT) is provided with a color selection mechanism on the back side of a panel for color selection. As the color selection mechanism, for example, an aperture grill 1 as shown in FIG. 10 is known. This aperture grill 1 is formed of a low carbon steel thin plate by a photoetching method and is formed with a plurality of slits 2 which become electron beam passage holes extending in one direction, that is, generally in the vertical direction, and the aperture grill 1 is opposed to this. A pair of support members 51, 61 (H members for horizontal frame) and U-shaped elastic members 71, 81 (V for vertical frame) supporting both ends thereof.
It is configured by being stretched on a metal support frame 91 made of a member).

In order to weld and assemble the aperture grill on the frame, the frame and the aperture grill are set at predetermined positions, and the vicinity of the center of the H member welding finish surface 4 is resistance-welded or laser-welded. Weld. At this time, as shown in Japanese Patent Publication No. 55-40978, the frame is pressed to weld the frame and the aperture grill by tension welding. This step will be described with reference to the drawings.

First, as shown in FIG. 11 (a), the vertical end portions of the aperture grill 1 are evenly chucked at both ends.
With, the pressing aperture grill 1 is uniformly pulled in the direction of arrow A, that is, in the vertical direction.

Next, as shown in FIGS. 11B and 11C, a compressive load (turnbuckle load) is applied from the side of the support frame 91 in the direction of arrow B, that is, in the vertical direction, and the support frame 91 is opened. Welding is performed by pushing it up in the direction of the grill 1 as shown by arrow C. The restoring force of the support frame 91 gives a tension stress to the aperture grill. When the aperture grill is irradiated with an electron beam, the temperature rises and expands, which tends to cause strain. However, when tension stress is applied, the stress is reduced by the expansion and the strain does not occur.

[0006]

The conventional method of tension welding the aperture grill to the frame adopts the turnbuckle method of deforming the frame as described above, so that the following problems occur.

A pressurizing mechanism and pressurizing contact for bending the support frame 91 are required in the color selecting mechanism manufacturing apparatus, and the apparatus structure becomes complicated and the apparatus becomes expensive. In addition, the tension stress distribution changes with time due to wear of the pressure contact.

Further, in order to ensure the tension stress of the aperture grill sufficiently and accurately, the U-shaped elastic members 71 and 81 (V members for the vertical frame) forming the support frame 91 are located on the H member side. It is necessary to increase the length of the side and bend it to the plastic deformation region. For this reason, it becomes difficult to reduce the weight of the frame, and strength loss of the frame easily occurs.

Further, since the support frame 91 is bent and assembled, the dimensional accuracy after the assembly varies greatly.
Particularly, in the case of a large tube, when the support frame 91 is bent, a rotational moment about the longitudinal direction of the support members 51 and 61 acts. This rotation varies depending on the positions of the supporting members 51, 61 in the longitudinal direction.
1 is twisted, and the reliability of welding is deteriorated due to the occurrence of splash and the unevenness of the nugget diameter. Further, wrinkles on the aperture grille, uneven pitch of the slits 2, and the like occur.

In addition, the support frame 9 has a limited pressure point.
Since 1 is pressurized, the degree of freedom of the tension stress distribution is low, and stress concentration is likely to occur in the support frame 91, which causes thermal deformation in the frit sealing process and the exhaust process of the tube body following the blackening treatment. Occurs and affects the beam landing characteristics.

On the other hand, while the aperture grill 1 is separated from the support frame 91, the aperture grill 1 is heated and thermally expanded, and is fixed to the support frame 91 having a temperature difference from the aperture grill 1 in this thermal expansion state at room temperature. In the method of Japanese Patent Laid-Open No. 62-252031, in which a predetermined tension stress is generated in the aperture grill 1 when the aperture grill 1 is returned to the position, the aperture grill 1 thermally expands not only in the grill direction but also in the direction perpendicular to the grill. The slit width of the grill changes depending on the location. There is a problem in that pitch unevenness and the like occur.

The present invention solves the problems in the turnbuckle system and the thermal expansion system described above, and provides a cathode ray tube color selection mechanism and a method for manufacturing the same, which can favorably manufacture an aperture grill.

[0013]

According to the first aspect of the present invention, after fixing the aperture grill to the frame, a tension stress adjusting component is inserted between the aperture grill and the fixing surface of the frame to apply a desired tension stress. With the obtained structure, a color selection mechanism for the cathode ray tube with the aperture grill stretched well can be obtained.

According to a second aspect of the present invention, a groove or a projection for fixing the tension stress adjusting component is formed on the surface of the frame on which the aperture grill is stretched, so that the tension stress adjusting jig can be easily mounted. As a result, the aperture grill is satisfactorily stretched while obtaining a desired stretching stress, and a color selection mechanism for the cathode ray tube is obtained.

According to the present invention, the tension stress distribution of the aperture grill can be arbitrarily set by distributing the depth of the groove for fixing the tension stress adjusting component formed on the surface of the frame where the aperture grill is stretched. By adjusting to, the color selection mechanism of the cathode ray tube with the aperture grill stretched well can be obtained.

According to a fourth aspect of the present invention, the groove or protrusion for fixing the tension stress adjusting component formed on the surface of the frame on which the aperture grill is stretched is fixed, and the distance between the frame and the fixed portion of the aperture grill is distributed. By providing a distribution of the tension stress of the aperture grill, a color selection mechanism of a well-stretched cathode ray tube is obtained.

In the fifth aspect, the tension stress adjusting component is a wire, so that the tension stress adjusting component can be simplified.

In the present invention, after the aperture grill is stretched on the frame, a tension stress adjusting component is inserted between the aperture grill and the tension surface of the frame to apply a predetermined tension stress to the aperture grill. A method of manufacturing a color selecting mechanism is proposed.

[0019]

According to the present invention, the aperture grill is stretched on the frame, and the tension stress adjusting component is inserted between the tension faces of the aperture grill and the frame so that the aperture grill remains restrained at the fixed point. Be postponed. This gives a turnbuckle load to the frame,
Stretching stress can be applied to the aperture grill without thermally expanding the aperture grill.

According to the second aspect of the present invention, the reaction force received from the aperture grill by the tension stress adjusting component is formed by forming a groove or a protrusion for fixing the tension stress adjusting component on the aperture grill tension surface of the frame. Can easily prevent desorption. As a result, the tension stress adjusting component can be easily and arbitrarily attached and detached.

According to the third aspect of the present invention, the depth of the groove for fixing the tension stress adjusting component formed on the aperture grill tension surface of the frame is distributed so that the aperture grill extends when the groove is deep. Reduces the tension stress,
When the groove is shallow, the extension of the aperture grill increases and the tension stress can be increased. As a result, the tension stress distribution of the aperture grill can be changed arbitrarily.

According to a fourth aspect of the present invention, the distance between the groove or the projection for fixing the tension stress adjusting component formed on the tension surface of the aperture grill of the frame and the distance between the frame and the welded portion of the aperture grill is distributed. When the distance is long, the extension of the aperture grill is small and the tension stress is low, and when the distance is short, the extension of the aperture grill is large and the tension stress can be high. As a result, the tension stress distribution of the aperture grill can be changed arbitrarily.

In the fifth aspect, the tension stress adjusting component is a wire, so that the tension stress adjusting component having a good diameter accuracy and a smooth surface can be easily obtained.

According to the sixth aspect, the aperture grill is extended by tensioning the aperture grill on the frame and then inserting the tension stress adjusting component between the aperture grill and the tension surface of the frame. As a result, tension stress can be applied without applying a turnbuckle load to the frame and without thermally expanding the aperture grill.

[0025]

【Example】

Example 1. FIG. 1 is an example applied to the manufacture of a color selection mechanism according to an embodiment of the present invention. In this example, a large number of slits serving as electron beam transmission holes were formed on a low carbon steel thin plate by photoetching, and an aperture grill 1 was produced in which each strip-shaped grid element body 3 was connected at the periphery. further,
A pair of supporting members 5 and 6 made of stainless steel facing each other and a U-shaped high-rigidity member 7 and 8 supporting between both ends of the supporting frame 9 were produced.

As shown in FIG. 1A, the support frame 9
Was positioned and arranged at a predetermined position, and the aperture grill 1 was arranged above the support frame 9. The aperture grille 1 was held in a state in which both longitudinal ends of the grid element body 3 were pulled by chucks 10 and 11 that required a pulling function to such an extent that the aperture grille 1 was not loosened.

Next, as shown in FIG. 1 (b), the support frame 9 is raised to bring the welding finish surface 4 of the support members 5 and 6 into contact with the aperture grille 1 and the laser is applied at the contacted portion. Both were welded and fixed by laser welding with light 12. Further, after removing unnecessary portions of the aperture grille 1, the color selection mechanism was subjected to blackening treatment at a holding temperature of 450 ° C., a holding time of 15 minutes, and a heat treatment time of 90 minutes.
The blackening treatment is to form black rust on the surface to prevent the generation of other harmful rust.

Next, the tension stress adjusting component 18 shown in FIG. 1C is inserted between the aperture grille 1 and the H member of the color selecting mechanism after the blackening treatment, and the tension stress adjusting component 18 and H member are inserted. The members were laser welded and welded together. At this time, the tension stress adjusting component 18 has a distribution in the thickness in the longitudinal direction in order to adjust the tension stress distribution as described later. As a result, the grid element body was stretched and stretched between the supporting members 5 and 6 with a required tension. As a result, the color selection mechanism shown in FIG. 10 was obtained.

FIG. 2 shows the stress-strain curve of the low carbon steel which is the material for the above aperture grill. From the figure, it is necessary to add a strain of about 0.3% in the low carbon steel having a thickness of 0.1 mm used in this embodiment to obtain the maximum tensile stress of 50 kg / mm ² in this embodiment. Therefore, if a stretch corresponding to this strain is generated in the aperture grill 1 by the tension stress adjusting component 18, tension is applied to the aperture grill 1.

FIG. 3 shows a schematic view of the insertion portion of the tension stress adjusting component 18. Before inserting the tension stress adjusting component, the length from the welding point 13 of the aperture grill 1 and the supporting frame to the welding point 13 along the aperture grill 1 is L, the tension stress adjusting component height h, and the tension from the welding point 13. If the distance between the contact point between the stress adjusting component 18 and the aperture grill 1 is D,
From welding point 13 before and after insertion of tension stress adjusting parts to welding point 13
The difference in length along the aperture grill 1 up to is represented by the following equation.

[0031]

[Equation 1]

In order to obtain the tension stress of 50 kg / mm ² , the equation 1 may be divided by L to obtain 0.003.

In advance, h = 1 mm, D = 0.8 mm, L = 3
Tensile stress of 50 kg / mm when the experiment was conducted at 10 mm
² was obtained, and the above calculation was found to be almost valid. In this example, based on this experiment, at the end of the aperture grill, h = 1 mm, D = 1 mm, and L = 310 mm, the tension stress was 43 kg / mm ² , and at the center, h = 0.7 mm.
23 kg / mm ^{2 when} D = 1 mm and L = 310 mm, and a smooth thickness distribution in the longitudinal direction of the jig was added to the tension stress adjusting component height. As a result, the tension distribution in the arrangement direction of the grid element bodies 3 became larger in the tension in the grid element bodies 3 at both ends than in the central portion, as shown in FIG. If the tension distribution is uniform, the frequencies are the same, and the vibrations are not damped. It is preferable to make the tension distribution non-uniform because the vibration is quickly attenuated.

According to the above-described manufacturing method, a desired tension can be applied to the aperture grill 1 without applying a turnbuckle to the support frame 9, so that the support frame 9 can be provided.
The pressure mechanism and the pressure contact for the above can be omitted, and the structure of the manufacturing apparatus can be simplified. Further, since the support frame 9 is not bent, the rotation moment does not act on the support members 5 and 6, the reliability of welding is improved, and wrinkles, pitch irregularities of slits, etc. do not occur, and after assembly, Variation in dimensional accuracy could be reduced. Further, since the stress concentration does not occur on the supporting frame 9, the frit seal following the blackening treatment and the thermal deformation in the exhaust process do not occur, and the beam landing characteristics are improved. Further, since there is no plastic deformation of the frame and the frame strength can be effectively utilized, the weight of the frame structure can be reduced. Further, in the present invention, since tension tension is applied after the blackening of the aperture grille 1, pitch unevenness due to plastic deformation of the grille body during the blackening treatment can be suppressed.

Example 2. FIG. 5 shows an example applied to the manufacture of a color selection mechanism according to another embodiment of the present invention. Also in this embodiment, as in the case of the first embodiment, a plurality of slits to be electron beam transmitting holes are formed in the low carbon steel thin plate by photo-etching, and the aperture grille 1 in which each strip-shaped grid element body 3 is connected in the periphery is formed. It was made. Further, a support frame 9 including a pair of support members 5 and 6 facing each other and a U-shaped high-rigidity member 7 and 8 supporting between both ends thereof was manufactured. This time,
The finished surfaces of the support members 5 and 6 for welding the aperture grille were machined to form grooves 14 for fixing the tension stress adjusting component as shown in FIG.

As shown in FIG. 5A, the support frame 9
Was positioned and arranged at a predetermined position, and the aperture grill 1 was arranged above the support frame 9. Aperture grill 1 Both ends of the grid element body 3 in the longitudinal direction were held in a state of being pulled by chucks 10 and 11 that require a pulling function to such an extent that there is no slack in the aperture grill 1.

Next, as shown in FIG. 5B, the supporting frame 9 is raised to bring the surfaces of the supporting members 5 and 6 into contact with the aperture grille 1, and the laser beam 12 is used to emit laser light at the contacted portions. Both were welded and fixed by welding.
Furthermore, after removing unnecessary parts of the aperture grill 1,
This color selection mechanism has a holding temperature of 450 ° C, a holding time of 15 minutes,
A blackening treatment was performed at a heat treatment time of 90 minutes.

Next, as shown in FIG. 5C, a jig 15 for pushing the tension stress adjusting component 18 between the aperture grill 1 and the H member of the color selection mechanism after the blackening treatment is supported by the supporting member 5. , 6, and the tension stress adjusting component 18 was placed on the support members 5, 6. In this embodiment, as the tension stress adjusting component 18, a steel wire having a diameter of 1 mm was used. After that, the jig 15 is used to adjust the tension stress adjusting component 18
Was attached to the groove 14 and fixed between the H member and the aperture grill 1. At this time, the groove 14 has a depth distribution in the longitudinal direction in order to adjust the tension stress distribution. As a result, the grid element was stretched and stretched between the supporting members 5 and 6 with a required tension, and the color selecting mechanism shown in FIG. 10 was obtained.

According to the manufacturing method described above, the desired tension can be applied to the aperture grill 1 without applying a turnbuckle to the supporting frame 9, so that the supporting frame 9
The pressure mechanism and the pressure contact for the above can be omitted, and the structure of the manufacturing apparatus can be simplified. Further, since the support frame 9 is not bent, the rotation moment does not act on the support members 5 and 6, the reliability of welding is improved, and wrinkles, pitch irregularities of slits, etc. do not occur, and after assembly, Variation in dimensional accuracy could be reduced. Further, since the stress concentration does not occur on the supporting frame 9, the frit seal following the blackening treatment and the thermal deformation in the exhaust process do not occur, and the beam landing characteristics are improved. Further, since there is no plastic deformation of the frame and the frame strength can be effectively utilized, the weight of the frame structure can be reduced. Further, in the present invention, since tension tension is applied after the blackening of the aperture grille 1, pitch unevenness due to plastic deformation of the grille body during the blackening treatment can be suppressed.
Furthermore, since the tension stress adjusting component 18 can be fixed without welding, the mounting is facilitated and the tension stress can be changed even after the tension stress is once applied. Moreover, the manufacturing apparatus could be simplified. Moreover, since a wire is used as the tension stress adjusting component 18, a highly accurate tension stress adjusting jig can be easily obtained at low cost.

Example 3. In Example 2, the groove depth for fixing the tension stress was changed in order to adjust the tension stress distribution. However, as shown in FIG. 7, the aperture grille 1 from the groove 14 is changed.
It was also possible to adjust the tension stress distribution because the extension of the grill also changed by changing the distance between the welding member and the welding line of the support member.

According to this manufacturing method, it is not necessary to change the depth of the grooves formed in the supporting members 5 and 6, so that the supporting members 5 and 6 can be easily machined.

Example 4. FIG. 8 is an example applied to manufacture of a color selection mechanism according to another embodiment of the present invention. Also in this example, as in the case of Example 1, a large number of slits to be electron beam transmitting holes were formed in a low carbon steel thin plate by photoetching, and an aperture grill 1 in which each strip-shaped grid element 3 was connected at the periphery was produced. did. Furthermore, a pair of support members 5 and 6 facing each other and a U-shaped high-rigidity member 7 supporting between both ends thereof,
A support frame 9 composed of 8 was produced. At this time, the welding surfaces of the supporting members 5 and 6 with the aperture grill 1 were machined to form a protrusion 16 for fixing the tension stress adjusting component as shown in FIG.

As shown in FIG. 8A, the support frame 9
Was positioned and arranged at a predetermined position, and the aperture grill 1 was arranged above the support frame 9. The aperture grill 1 was held in a state in which both longitudinal ends of the grid element body 3 were pulled by chucks 12 and 13 that required a pulling function to such an extent that there was no slack in the aperture grill 1. At this time, a steel wire having a diameter of 1 mm was placed on the H member as the tension stress adjusting component 18.

Next, as shown in FIG. 8 (b), the support frame 9 is raised to bring the surfaces of the support members 6 and 7 into contact with the aperture grille 1, and the contacted portions are resistance-welded to each other. Welded and fixed. Further, after removing unnecessary portions of the aperture grille 1, the color selection mechanism was subjected to blackening treatment at a holding temperature of 450 ° C., a holding time of 15 minutes, and a heat treatment time of 90 minutes.

Next, as shown in FIG. 8C, a jig 15 for pushing the tension stress adjusting component 18 between the aperture grill 1 and the H member of the color selecting mechanism after the blackening treatment is supported by the supporting member 5. , 6, and the jig 15 was used to move the tension stress adjusting component 18 to the outside of the protrusion to fix it between the H member and the aperture grill 1. At this time, the protrusion 16
The distance between the welding line and the welding line has a longitudinal distribution in order to adjust the tension stress distribution. As a result, the grid element was stretched and stretched between the supporting members 5 and 6 with a required tension, and the color selecting mechanism shown in FIG. 10 was obtained.

According to the manufacturing method described above, the desired tension can be applied to the aperture grill 1 without applying a turnbuckle to the support frame 9, so that the support frame 9 can be provided.
The pressure mechanism and the pressure contact for the above can be omitted, and the structure of the manufacturing apparatus can be simplified. In addition, since the support frame is not bent, a rotational moment does not act on the support members 5 and 6, the reliability of welding is improved, wrinkles and uneven pitch of slits do not occur, and the dimensions after assembly are improved. The variation in accuracy could be reduced. Further, since stress concentration does not occur in the support frame, the frit seal following the blackening treatment and the thermal deformation in the exhaust process do not occur, and the beam landing characteristics are improved. Further, since there is no plastic deformation of the frame and the frame strength can be effectively utilized, the weight of the frame structure can be reduced. Further, in the present invention, since tension tension is applied after the blackening of the aperture grille 1, pitch unevenness due to plastic deformation of the grille body during the blackening treatment can be suppressed. Furthermore, since the tension stress adjusting component 18 can be fixed without welding, the mounting is facilitated and the tension stress can be changed even after the tension stress is once applied. Moreover, the manufacturing apparatus could be simplified. Further, by using the wire as the tension stress adjusting component 18, it has become possible to easily obtain a highly accurate tension stress adjusting component at low cost.

In the first to fourth embodiments, the tension stress is generated only by inserting the tension stress adjusting component, but the present invention may be used in combination with the turnbuckle method and the thermal expansion method. When used in combination with the turnbuckle method, the amount of turnbuckle can be reduced to reduce problems such as plastic deformation of the support frame. When used in combination with the thermal expansion method, it is possible to reduce the temperature rise of the mask and reduce problems such as pitch unevenness.

[0048]

As described above, according to the first and sixth aspects, the aperture grill is stretched on the frame, and the tension stress adjusting component is inserted between the aperture grill and the frame to obtain a desired tension. By using a structure that obtains stress,
The aperture grill is stretched well, the reliability of the aperture grill stretch is improved, and wrinkles and slit pitch irregularities do not occur, and it is possible to obtain a cathode ray tube color selection mechanism with good beam landing characteristics. .

According to a second aspect of the present invention, a groove or a protrusion for fixing the tension stress adjusting jig is formed on the surface of the frame on which the aperture grill is stretched, so that the tension stress adjusting component can be easily mounted. As a result, in addition to the effect of the first aspect, it becomes easy to mount the tension stress adjusting component, and the change can be made even after the tension stress is once applied. Also,
The manufacturing apparatus can also be simplified.

In the third aspect, the tension stress distribution of the aperture grill is simplified by providing the depth of the groove for fixing the tension stress adjusting component formed on the surface of the frame on which the aperture grill is stretched. It becomes possible to adjust it arbitrarily.

According to the present invention, the distance between the groove or the projection for fixing the tension stress adjusting component formed on the surface of the frame on which the aperture grill is stretched and the distance between the frame and the fixed portion of the aperture grill is distributed. , It becomes possible to easily and arbitrarily adjust the tension stress distribution of the aperture grill.

In the fifth aspect, since the wire is used as the tension stress adjusting component, it is possible to easily obtain a highly accurate tension stress adjusting component at low cost.

[Brief description of drawings]

FIG. 1 is a process diagram of a method for manufacturing a color selection mechanism according to a first embodiment of the present invention.

FIG. 2 is a stress-strain curve of an aperture grill material used in one example of the present invention.

FIG. 3 is a schematic view showing an aperture grill weld portion according to an embodiment of the present invention.

FIG. 4 is a tension stress distribution of an aperture grill according to an embodiment of the present invention.

FIG. 5 is a process drawing of a method of manufacturing a color selection mechanism according to another embodiment of the present invention.

FIG. 6 is a schematic view of a finish surface for aperture grill welding of a color selection mechanism according to another embodiment of the present invention.

FIG. 7 is a schematic view of a finish surface for aperture grill welding of a color selection mechanism according to another embodiment of the present invention.

FIG. 8 is a process drawing of a method of manufacturing a color selection mechanism according to another embodiment of the present invention.

FIG. 9 is a schematic view of a finished surface for aperture grill welding of a color selection mechanism according to another embodiment of the present invention.

FIG. 10 is a schematic view of a color selection mechanism.

FIG. 11 is a process diagram of a conventional method for manufacturing a color selection mechanism.

[Explanation of symbols]

1 Aperture Grill 2 Slit 3 Grid Element 4 Finished Surface for Welding 5 Support Member (H Member) 6 Support Member (H Member) 7 Support Member (V Member) 8 Support Member (V Member) 9 Support Frame 10 Chuck 11 Chuck 12 Laser light 13 Welding point 14 Tension stress adjustment component installation groove 15 Tension stress adjustment component installation jig 16 Tension stress adjustment component fixing protrusion 17 Resistance welding electrode 18 Tension stress adjustment component

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaharu Moriyasu 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Production Technology Center (72) Inventor Haruo Watanuki No. 1 Nagaokakyo Baba Institute Mitsubishi Electric Stock Association Company tube factory

Claims (6)

[Claims] 1. A frame having a surface on which an aperture grill used for color selection of a cathode ray tube is stretched, and a tension which is inserted between the surface of the frame and the aperture grill to apply a predetermined stress to the aperture grill. Color selection mechanism with stress adjusting parts. 2. A frame having a surface on which an aperture grill used for color selection of a cathode ray tube is stretched and fixed, and a predetermined stress applied to the aperture grill by being fixed to a groove or a protrusion provided on the surface of the frame. A color selection mechanism having a tension stress adjusting component for giving a tension. 3. The color selection mechanism according to claim 1, wherein the depth of the groove has a distribution. 4. The color selection mechanism according to claim 1, wherein the distance between the fixed portion of the aperture grill and the groove or the projection is distributed. 5. The color selection mechanism according to claim 1, wherein the tension stress adjusting component is a wire. 6. A step of tensioning and fixing an aperture grill used for color selection of a cathode ray tube on a surface of a frame, and inserting a tension stress adjusting component between the tensioned aperture grill and the surface of the frame. And a step of applying a predetermined tension to the aperture grille.