JPH11345574A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the support of a color sorting electrode mechanism from becoming unstable after a frit sealing process and to prevent mislanding during an operating condition. SOLUTION: A color cathode-ray tube includes a color sorting electrode mechanism 4 consisting of an aperture grill 8 and a frame 5 supporting the aperture grill 8, a glass tube body to which a panel formed with a fluorescent surface on its inner surface and provided with pins at predetermined positions on its interior wall and a funnel with at least an electron gun mounted therein are welded, and mask springs 7 each made of a strip of elastic material, having at one end a fixed part to the frame 5 and at the other end a pin fitting hole 71 which fits over the pin and having at its mid part a V-shaped curved part 72 which absorbs its deformation toward the inside of its strip surface. The fixed part of the mask spring 7 is fixed to the frame and the pin fitting holes 7 are fitted over the pins on the interior wall of the panel to support the color sorting electrode mechanism 4 inside the panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube having a color selection electrode mechanism supported by a mask spring, and more particularly to a cathode ray tube which prevents the color selection electrode mechanism from becoming unstable after a frit sealing process and operates. The present invention relates to a color cathode ray tube in which the occurrence of mislanding in a state is prevented.

[0002]

2. Description of the Related Art FIG. 7 is an explanatory view showing the structure of a general color cathode ray tube. FIG. 8 is an explanatory view illustrating a color selection electrode mechanism of a general color cathode ray tube. As shown in FIG. 7, a general color cathode ray tube is provided between the electron gun 3 and the phosphor screen 12 so that the electron beam 31 emitted from the electron gun 3 reaches only a predetermined phosphor on the phosphor screen 12. The color selection electrode structure mechanism 4 is disposed. The color selection electrode mechanism 4 has several types of structures, one of which is a color selection electrode called an aperture grill 8 having a large number of slit-like pores 82 as shown in FIG. , Frame 5. The color selection electrode mechanism 4 is supported on the inner surface of the panel 1 via a mask spring 7 made of a band-like elastic material. 8, the frame 5 includes, for example, a pair of opposing support rods 51 having an L-shaped cross section, and a pair of elastic support members 52 that are mounted across the pair of support rods 51. The aperture grille 8 is made of a thin metal plate having a large number of slits 82 arranged at predetermined intervals in one direction by, for example, chemical etching. Further, when welding both ends of the slit 82 of the aperture grill 8 in the extending direction to the pair of support rods 51, a load is applied to the support rods 51 in a direction approaching each other, and after the welding, the load is released and the grid 81 is released. At a certain tension.

A mask spring 7 having a pin fitting hole 71 for fitting to a pin 11 provided on the inner wall of the panel 1 is attached to the frame 5 of the color selecting electrode mechanism 4 via a mask clip 6. The color selection electrode mechanism 4 is supported inside the panel 1 by fitting the pin fitting hole 71 with the pin 11. The frame 5, the mask clip 6, and the mask spring 7 are attached by welding or the like. On the other hand, the color cathode ray tube manufacturing process includes a process of welding the panel 1 and the funnel 2 with frit glass. This is called a frit sealing step. In the frit sealing step, it is necessary to heat the color cathode ray tube to a temperature close to 450 ° C. to melt the frit glass. At this time, the color selection electrode mechanism 4 disposed inside is also heated to the same temperature. The color cathode ray tube completed through the frit sealing process causes the electron beam 31 emitted from the electron gun 3 to reach only a predetermined phosphor through the aperture grill 8 and projects a screen.
For this purpose, the color selection electrode mechanism 4 after the frit sealing process is used.
Must be located at predetermined positions in the color cathode ray tube.

[0004]

However, in the conventional color cathode ray tube as described above, the color selection electrode mechanism 4 is heated to a high temperature in the frit sealing step. Since the color selection electrode mechanism 4 is heated to a high temperature in a state where tension is applied to the grid 81 of the aperture grill 8, the frame 5 and the aperture grill 8 are deformed in a high temperature state. Further, the color selection electrode mechanism 4 in a high temperature state is also deformed by thermal expansion of each member, and both are generated at the same time, so that the color selection electrode mechanism 4 is complicatedly deformed. Due to this deformation, a force acts to shift the relative position between the pin fitting hole 71 of the mask spring 7 and the pin 11 provided on the inner wall of the panel 1. When this force exceeds the allowable range of elasticity of each member in a high temperature state, plastic deformation occurs. However, due to the structure of the color selection electrode mechanism 4, the mask spring 7 having low rigidity and the welded portion between the mask spring 7 and the mask clip 6 are formed. Plastically deforms. In particular, since the mask spring 7 has a belt-like structure, the in-plane direction (D direction and E (Z) direction, FIG.
(See (a) and (b)). Therefore, after returning to the normal temperature state after the frit sealing process, the relative positions of the pin fitting holes 71 of the mask spring 7 and the pins 11 provided on the inner wall of the panel 1 are shifted, and the color selection electrode mechanism 4 is stably supported. The problem of not being performed occurs.

As another problem, in the operating state of the completed color cathode ray tube, a part of the electron beam 31 emitted from the electron gun 3 hits the grid 81 of the aperture grill 8, and the aperture grill 8 generates heat. This heat is transmitted to the support rod 51 to which the aperture grill 8 is welded, and the support rod 51 thermally expands. This thermal expansion causes a phenomenon called mislanding in which the electron beam 31 does not hit a predetermined phosphor. That is, as shown by a chain line in FIG. 9A, when the support rod 51 thermally expands in the longitudinal direction indicated by A, the grid 81 of the aperture grill 8 is displaced following the thermal expansion. On the other hand, the mask spring 7 also expands due to thermal expansion, but the panel 1 whose outer surface is exposed to the outside air does not thermally expand. Therefore, the electron beam 31 that has reached the predetermined phosphor 12a through an arbitrary slit 82 when not thermally expanded passes through the displaced slit 82 as indicated by a dashed line after the support rod 51 is thermally deformed. As a result, it reaches a position shifted from the predetermined phosphor 12a. That is, mislanding occurs.

As a method of correcting the mislanding, as shown in FIG. 9B, the support rod 51 to which the aperture grill 8 is welded is displaced toward the panel 1 (in the direction of arrow B). In many cases, the slit 82 is returned to the trajectory of the electron beam 31 that has passed through the slit 82 when the thermal expansion is not performed. In a conventional color cathode ray tube, mislanding is corrected by using a bimetal structure material for the mask clip 6 to which the mask spring 7 is attached.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The color selection electrode mechanism support member is provided with an in-plane direction deformation absorbing portion formed of a V-shaped curved portion, so that the color selection electrode is supported. Prevents the mechanism support member from being plastically deformed and reduces the deviation of the relative position between the pin fitting hole of the color selection electrode mechanism support member and the pin provided on the panel inner wall when returning to room temperature after frit sealing. It is another object of the present invention to provide a color cathode ray tube which prevents a problem that a color selection electrode mechanism is unstablely supported. In addition, by mounting a color selection electrode mechanism support member having a V-shaped curved portion on a frame to which the color selection electrodes are fixed so that the pin fitting hole sides thereof face each other, mislanding in an operating state occurs. It is an object of the present invention to obtain a color cathode ray tube which prevents the occurrence of color cathode ray tubes.

[0008]

A color cathode ray tube according to the present invention has a color selection electrode mechanism including a color selection electrode and a frame supporting the color selection electrode. A glass tube consisting of a panel provided with pins at predetermined positions, a funnel having at least an electron gun mounted inside, a band-shaped elastic material fixed at one end to the frame, and fitted at the other end to the pin. A pin selection hole to be fitted, a color selection electrode mechanism support member provided with an in-plane direction deformation absorbing portion for absorbing deformation in the in-plane direction in the middle portion, and a fixing portion of the color selection electrode mechanism support member is a frame. And the pin fitting hole is fitted to the pin on the panel inner wall,
A color selection electrode mechanism is supported inside the panel.

[0009] Further, the in-plane direction deformation absorbing portion is constituted by a V-shaped curved portion. Further, the color selection electrode mechanism has a frame including a pair of support rods facing each other, a pair of elastic supports attached across the pair of support rods, and an aperture fixed to the pair of support rods. It is constituted by a color selection electrode composed of a grill. In addition, two color selection electrode mechanism support members are attached to a support rod to which the aperture grill is fixed so that their pin fitting hole sides face each other. Further, the color selection electrode mechanism is formed by a frame formed of a long side member and a short side member in a frame shape, and a color selection electrode including a shadow mask fixed to the long side member and the short side member. And two color selection electrode mechanism support members are attached to at least one member of the frame such that the pin fitting hole sides thereof face each other.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a perspective view showing a color selection electrode mechanism according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a color selection electrode mechanism using a mask spring different from FIG. 1 in Embodiment 1, and FIG. FIG. 4 is an explanatory view illustrating a mask spring in Embodiment 1.
(A) is a diagram for explaining the operation of the mask spring of the first embodiment, (b) is a diagram for explaining the operation of the conventional mask spring, and (c) is an example of the dimensions of the mask spring of the first embodiment. FIG. 1 and 2, FIG.
The same parts as those described above are denoted by the same reference numerals, and description thereof will be omitted. The first embodiment differs from the conventional example shown in FIG. 8 in that a curved portion 72 is provided in the mask spring 7. The curved portion 72 is formed in a V-shape when viewed from the Z-axis (tube axis) direction in FIGS. 1 and 2.

Hereinafter, the curved portion 72 will be described in more detail. The curved portion 72 is formed such that the cross section of the curved surface perpendicular to the belt-shaped surface of the mask spring 7 and parallel to the long side thereof is V-shaped. Also, the boundary lines 73 and 74 on the belt-like surface are formed such that the vertices are V-shaped with one vertex near one long side. Therefore, V of the cross-sectional shape increases from one long side to the other. Here, the curved portion 72 is referred to as a V-shaped curved portion. FIG. 1 shows a V-shaped curved portion 72 provided on the outside, and FIG. 2 shows a V-shaped curved portion 72 provided on the inside. Next, the V-shaped curved portion 72
3 will be described with reference to FIG. First, of the deformation of the color selection electrode mechanism, the deformation in the direction (bending direction C) perpendicular to the belt-shaped surface of the mask spring 7 is caused by the V-shaped curved portion 72.
Irrespective of the above, the flexure of the mask spring 7 is absorbed and no plastic deformation occurs. Next, the deformation in the belt-like surface (D and E
In-plane deformation indicated by. The E direction coincides with the tube axis direction Z). The V-shaped bent portion (hereinafter simply referred to as a bent portion) 72 provided on the mask spring 7 changes the V-shaped bending angle. And plastic deformation does not occur.

Regarding the effect of the mask spring 7,
A description will be given of an example of a color selection electrode mechanism for a 21-inch color cathode ray tube. A color selection electrode mechanism for a 21-inch color cathode ray tube is supported inside the panel 1 with a structure as shown in FIG. The mask spring 7 is provided with a curved portion 72, the dimensions of which are as shown in FIG. With respect to this color selection electrode mechanism 4, the amount of displacement of the relative position between the pin fitting hole 71 of the mask spring 7 and the pin 11 of the panel 1 after the frit sealing process was measured. In the measurement, the pin fitting hole 71 of the other one of the four pin fitting holes 71 of the mask spring 7 was measured with respect to the virtual plane of three places.
Was measured. As a result, the results shown in Table 1 were obtained.

[0013]

[Table 1]

In Table 1, in the color selection electrode mechanism using the mask spring 7 according to the first embodiment, the displacement amount of the pin fitting hole 71 is reduced as compared with the conventional color selection electrode mechanism using the mask spring 7. doing. This is because the curved portion 72 is provided on the mask spring 7.

Embodiment 2 FIG. 4 is an explanatory diagram illustrating Embodiment 2 of the present invention. In FIG. 4, portions denoted by the same reference numerals as those in FIGS. 1 and 2 indicate the same portions. The second embodiment differs from the first embodiment in that two mask springs 7 are attached to a support rod 51 such that the pin fitting holes 71 thereof face each other. With this mounting, mislanding due to thermal expansion of the support rod 51 can be corrected. In addition,
In order to correct the mislanding, it is necessary to provide the curved portion 72 such that the vertex of the V-shape is located on the opposite side to the panel 1, that is, on the electron gun side, as shown in FIG.
Hereinafter, mislanding correction will be described. When the support rod 51 to which the aperture grille 8 is attached thermally expands in the longitudinal direction, the mounting position of the mask spring 7 (the position of the mask clip 6) is displaced in the same direction following this, but the panel 1 thermally expands. Therefore, the position of the pin 11 is not displaced. The difference in this displacement is the mask spring 7
Work in the longitudinal direction. As a result, as shown by the dashed line, the curved portion 72 provided on the mask spring 7 is deformed so as to expand, and the support bar 51 to which the aperture grill 8 is welded is displaced in the direction of the panel 1. Therefore, mislanding due to thermal expansion of the support rod 51 can be corrected.

It is not necessary to attach two mask springs 7 to the elastic support 52 so that the pin fitting holes 71 thereof face each other. The reason is that the aperture grill 8 of the color selection electrode mechanism 4 is welded only to the support bar 51, and the displacement due to the thermal expansion of the support bar 51 becomes the displacement of the aperture grill 8.

Embodiment 3 FIG. 5 is a perspective view showing a color selection electrode mechanism according to Embodiment 3 of the present invention. The color selection electrode mechanism 9 according to the third embodiment includes a color selection electrode 91 having a shadow mask structure in which a thin metal plate having a large number of pores is formed into a dome shape, and a frame type to which the color selection electrode 91 is welded. And a frame 92. The mask spring 7 is attached to the frame 92.
The mask spring 7 is the same as that of the second embodiment, and has a curved portion 72. Since the color selection electrodes 91 of the shadow mask structure are welded to the frame 92 on both the long side and the short side, displacement due to thermal expansion of the frame 92 becomes displacement of the color selection electrodes 91. Accordingly, two mask springs 7 are respectively provided on the long side member and the short side member of the frame 92 with the pin fitting holes 71.
By attaching so that the sides face each other,
Mislanding due to thermal expansion of the frame 92 can be corrected. In addition, two mask springs 7 are provided on only one of the long side member and the short side member.
The same effect can be obtained even if the pins are mounted so that the pin fitting holes 71 face each other.

FIG. 6 is an explanatory view for explaining another example of the mask spring 7. The curved portion 7 of the mask spring 7
2 is formed such that the vertex of the V-shape formed by the boundary lines 73 and 74 is outside one long side. The same effect can be obtained by using this mask spring 7 in the first to third embodiments.

[0019]

As described above, the present invention provides a color selection electrode mechanism including a color selection electrode and a frame supporting the color selection electrode, a fluorescent screen formed on the inner surface, and a pin at a predetermined position on the inner wall. , A glass tube body comprising a panel provided with a funnel having at least an electron gun mounted therein, and a pin fitting which is made of a band-shaped elastic material and has a fixed portion with a frame at one end and a pin at the other end. The hole is provided with a color selection electrode mechanism supporting member provided with an in-plane direction deformation absorbing portion for absorbing deformation in the in-plane direction in the middle portion, and a fixing portion of the color selection electrode mechanism supporting member is fixed to the frame, and a pin is provided. Since the fitting hole is fitted to the pin on the inner wall of the panel and the color selection electrode mechanism is supported inside the panel, the color selection electrode mechanism supporting member generated when the temperature returns to normal temperature after the frit sealing step is returned. pin Reduces the deviation of the relative position of the pin provided on Goana and the panel inner wall, it is possible to prevent a problem that the color selection electrode mechanism is unstable support.

Further, the color selection electrode mechanism is fixed to a frame including a pair of support rods facing each other, a pair of elastic supports attached across the pair of support rods, and a pair of support rods. A color selection electrode composed of a set aperture grille, and two color selection electrode mechanism support members are attached to a support rod to which the aperture grill is fixed so that their pin fitting hole sides face each other. Therefore, it is possible to prevent the occurrence of mislanding during the operation of the color cathode ray tube using the aperture grill.

Further, the color selection electrode mechanism is provided with a frame formed of a long side member and a short side member in a frame shape, and a color formed by a shadow mask fixed to the long side member and the short side member. It is constituted by a selection electrode, and two color selection electrode mechanism support members are attached to at least one member of the frame such that their pin fitting hole sides face each other. It is possible to prevent the occurrence of mislanding during the operation of the color cathode ray tube using the shadow mask.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a color selection electrode mechanism according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a color selection electrode mechanism using a mask spring different from that in FIG. 1 according to Embodiment 1 of the present invention;

FIG. 3 is an explanatory diagram illustrating a mask spring according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating Embodiment 2 of the present invention.

FIG. 5 is a perspective view showing a color selection electrode mechanism according to Embodiment 3 of the present invention.

FIG. 6 is an explanatory diagram illustrating another example of a mask spring.

FIG. 7 is an explanatory view showing the structure of a general color cathode ray tube.

FIG. 8 is an explanatory diagram illustrating a color selection electrode mechanism of a general color cathode ray tube.

FIG. 9 is an explanatory diagram illustrating a mislanding phenomenon of a color selection electrode mechanism of a general color cathode ray tube.

[Explanation of symbols]

1 panel, 2 funnel, 3 electron gun, 4 color selection electrode mechanism, 5 frame, 51 support rod, 52 elastic support, 7 mask spring, 71 pin fitting hole, 72
V-shaped curved section, 8 aperture grille, 11 pins, 12 phosphor screen.

Claims (5)

[Claims] 1. A color selection electrode mechanism comprising a color selection electrode and a frame supporting the color selection electrode, a panel having a fluorescent surface formed on an inner surface and a pin provided at a predetermined position on an inner wall; A glass tube comprising at least a funnel equipped with an electron gun, and a band-shaped elastic material, and a fixing portion for fixing to the frame at one end, and a pin fitting hole for fitting to the pin at the other end. A color selecting electrode mechanism supporting member provided with an in-plane direction deformation absorbing portion for absorbing the deformation in the in-plane direction; a fixing portion of the color selecting electrode mechanism supporting member is fixed to the frame; Are fitted to pins on the inner wall of the panel, and the color selection electrode mechanism is supported inside the panel. 2. The color cathode ray tube according to claim 1, wherein the in-plane direction deformation absorbing portion is constituted by a V-shaped curved portion. 3. A frame comprising a pair of support rods facing each other, a pair of elastic supports attached across the pair of support rods, and a pair of support rods. 3. A color cathode ray tube according to claim 1, wherein said color cathode ray tube is constituted by a color selection electrode comprising a fixed aperture grill. 4. The support member to which the aperture grill is fixed, wherein two color selection electrode mechanism support members are attached so that their pin fitting hole sides face each other. Color cathode ray tube. 5. A color selection electrode mechanism comprising a frame formed of a long side member and a short side member in a frame shape, and a shadow mask fixed to the long side member and the short side member. 2. A color selection electrode, wherein two color selection electrode mechanism support members are attached to at least one member of the frame such that their pin fitting holes face each other. Or a color cathode ray tube according to claim 2.