JP2002170497A - Mask frame structure and color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mask frame structure and a color picture tube with an easy constitution that can solve problems like deformation is generated on a soldered part comprising the mask frame by a heat load in a manufacturing process, and color shifting or aggravation of the vibration characteristic caused by weakend extension for preventing the heat load in the manufacturing process in the mask frame structure and the color cathode-ray tube that are attached by extending and stretching a shadow mask on the substantially rectangular shaped mask frame structure comprised of respective pair of first and second arm materials separately arranged each other. SOLUTION: A pair of first arm materials 26 fixing a shadow mask 16 is correspondingly arranged apart in a vertical direction. A pair of second arm materials 27 that defines the distance of the first arm materials and that gives extension to the shadow mask 16 are correspondingly arranged with distance in a horizontal direction. The first and the second arm materials 26, 27 are fixed by soldering, and bending parts 31-34 are formed on the second arm materials in order to disperse stress.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mask frame structure in which a shadow mask is stretched and held, and a color picture tube using the mask frame structure.

[0002]

2. Description of the Related Art At present, a color picture tube generally used for a color television receiver, a color terminal display and the like includes a face panel 71 having a substantially rectangular screen as shown in FIG. An envelope having a funnel 72 integrally joined to the face panel 71 is provided. A phosphor screen 73 having a three-color phosphor layer for emitting red, green, and blue light is provided on the inner surface of the face panel 71.
Are formed.

In the envelope, a shadow mask 75 for color selection by passing an electron beam 74 is provided on the inner surface of the face panel 71 via a mask frame 76 in opposition to the phosphor screen 73. Has been attached.

An electron gun 78 for emitting an electron beam 74 is provided in a neck 77 of the funnel 72. The electron beam 74 emitted from the electron gun 78 is provided.
A deflection yoke 79 mounted outside the funnel 72.
The electron beam 74 scans the phosphor screen 73 in the horizontal and vertical directions, thereby reproducing a color image on the phosphor screen 73.

Further, on the outer peripheral surface of the face panel 71,
The reinforcing band 80 is fitted, and a magnetic shield plate 81 is disposed inside the funnel 72.

[0006] Recently, as the size and screen size of such a color picture tube have been increased, the demand for flattening the screen has been increasing from the viewpoint of easy viewing. In particular, a color picture tube for a color terminal display has been required. Tubes also require higher resolution in addition to this.

In order to improve the resolution, it is necessary to reduce the pitch of the openings of the shadow mask 75 to achieve higher definition. However, since the openings of the shadow mask 75 are generally formed by etching, the openings are not formed. In consideration of the etching process, it is more efficient that the thickness of the shadow mask 75 is smaller. On the other hand, from the viewpoint of the mechanical strength of the shadow mask 75, a thicker plate is more advantageous, and in order to achieve higher definition, it is necessary to clear such conflicting conditions.

From this viewpoint, various methods have been proposed for holding the shadow mask 75 on the mask frame 76 by applying tension to a flat shadow mask 75 having a relatively small thickness. These methods use a flat shadow mask 75 having a large number of openings 82 as shown in FIG.
Then, with sufficient tension applied, the shadow mask 75
A pair of first arm members 83 which are vertically spaced apart and opposed to each other for welding and fixing the peripheral portions of the arm members;
The mask frame 7 is composed of a pair of second arm members 84 that are arranged to be orthogonal to 3 and that are spaced apart and opposed to each other in the horizontal direction to apply tension to the shadow mask 75.
6 is fixedly held.

An elastic support 85 for fitting and fixing with a stud pin (not shown) is fixed to the outer surface of each of the arm members 83 and 84 by spot welding or the like.

As a method of applying tension to the shadow mask 75, various methods have been considered. One of the methods is to form a thin slit as shown in Japanese Patent No. 609225. The shadow mask 75 thus formed is moved to a mask frame 76 having elasticity in the vertical off-axis direction.
Are fixed to mask fixing pieces attached to both ends of the substrate and tension is applied in the vertical direction.

The mask frame 76 used in this method
Are formed in a frame shape as a whole, but a pair of first arm members 83 of the two sets that are spaced apart and opposed to each other are used as mask fixing pieces that hold the shadow mask 75 by welding. The second arm member 84 is formed from a bar having a rectangular cross-section, which is disposed orthogonally to the vicinity of the end of the first arm member 83 and has a cross-sectional shape formed from an L-shaped bar. The first and second arm members 83 and 84 are fixed at their ends to form a frame-shaped mask frame 76.

With such a configuration, the shadow mask 75 in the form of a fine line slit does not have a horizontal connection, and therefore, if it is mounted on the mask frame 76 having elasticity added in the vertical off-axis direction, a high tension can be obtained. The shadow mask 75 itself has an advantage that wrinkling does not occur because it can be applied.

[0013] These mask frames 7 of the stretch-stretch type.
In No. 6, for example, as shown in JP-A-9-323126 and JP-A-9-167578, a hollow mask frame 76 is formed by forming a mask frame 76 from a metal plate by a method such as roll forming. By using the mask frame 76 having a hollow shape, the weight can be reduced, and the second moment of area can be improved by taking a sufficiently large cross section.
It is possible to obtain a strength that balances the tension of the shadow mask 75.

[0014]

In such a configuration,
In order to reduce color misregistration due to thermal expansion of the shadow mask 75 during operation of the color picture tube, and vibrations caused by speakers or external forces of the television receiver or the terminal display, etc., it is necessary to take sufficient tension of the shadow mask 75. There is. When obtaining this high tension, the first arm member 8
Stress concentrates on the welded portion between the third and second arm members 84.

[0015] In this case, even if the strength sufficient to withstand at room temperature is secured, if a temperature load is applied in a manufacturing process such as a sealing process or an exhausting process for manufacturing a color picture tube, the elasticity may be reduced. Since the strength such as the limit or the proof strength is reduced to about ２〜 to の of the room temperature, the first and second arm members 83 and 8 are passed after these manufacturing steps.
In some cases, the welded portion 4 may be deformed.

If the force applied to the mask frame 76 is set small in order to prevent this deformation, the tension applied to the shadow mask 75 also decreases, which causes color misregistration and vibration to increase, resulting in a color picture tube. The performance of had been degraded.

The present invention is particularly effective in a tension-retaining shadow mask structure, and has a high strength and does not deform even when a thermal load is applied in the process of manufacturing a color picture tube. It is an object of the present invention to provide a mask frame structure and a color picture tube which can improve the performance of the present invention and can reduce the weight.

[0018]

SUMMARY OF THE INVENTION According to the present invention, there is provided a pair of first arm members which are opposed to each other for extending and extending a shadow mask, and which are arranged opposite to each other so as to be substantially perpendicular to the first arm members. A mask frame structure including a pair of second arm members for defining a distance between the first arm members and applying tension to the shadow mask, wherein a bent portion is formed in the second arm member.

By configuring the mask frame structure as described above, when tension is applied to the shadow mask, the stress applied to the mask frame structure is dispersed to the bent portion provided on the second arm member, so that the first arm member is bent. In addition, stress does not concentrate on the welded portion of the second arm member, and deformation does not occur even when a thermal load is applied.

The present invention also provides a rectangular face panel having a phosphor screen on the inner surface, a funnel-shaped funnel connected to the face panel, and a predetermined distance from the phosphor screen disposed in the face panel. , A pair of first arm members arranged to hold the shadow mask in a stretched state, and a pair of second arm members fixed to the pair of first arm members arranged to face each other. A color picture tube having a mask frame structure composed of the above arm members and an electron gun for emitting an electron beam for scanning the phosphor screen through the shadow mask, and having a bent portion formed in the second arm member.

With this configuration, since the mask frame structure is not deformed due to the thermal load, the shadow mask can be stretched and stretched with high tension, thereby suppressing the occurrence of color shift and vibration. It is possible to obtain a high-performance color picture tube.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a multi-neck type color picture tube having two necks, and FIG. 2 is a perspective view thereof. That is, the face panel 11 includes a face panel 11 having a substantially rectangular screen, and an envelope having a funnel 13 integrally provided with the face panel 11 and having two necks 12. Is formed with a phosphor screen 14 having a three-color phosphor layer that emits red, green, and blue light.

In the envelope, a shadow mask 16 through which an electron beam 15 passes for color selection is provided on the inner surface of the face panel 11 so as to face the phosphor screen 14. Has been attached through.

Further, the two necks 1 of the funnel 13
An electron gun 18 for emitting an electron beam 15 is provided in each of the two. The electron beam 15 emitted from the electron gun 18 is attached to the outside of a funnel 13 corresponding to each neck 12. By deflected by the magnetic fields generated by the deflection yokes 19 and scanning the phosphor screen 14 in the horizontal and vertical directions with the electron beam 15, the single electron synthesized by the respective electron guns 18 on the phosphor screen 14. Alternatively, the color picture tube 20 is configured to reproduce and display individual color images.

As shown in FIG. 3, the mask frame structure 17 has four stud pins 22 fixed to the inner surfaces of the four corners of the skirt portion 21 of the face panel 11 and the outer surfaces of the four corners of the mask frame structure 17. The fixed four elastic supports 23 are locked in the face panel 11.

The mask frame structure 17 is a flat plate made of a thin metal plate of a stripe type in which, for example, a large number of rectangular openings 24 are arranged in a large number of openings separated by bridge portions 25. A shadow mask 16 having a substantially rectangular shape is welded and fixed, and its long side is parallel to the first axis (horizontal axis X) and its short side is parallel to the second axis (vertical axis Y). is there.

On the other hand, the mask frame structure 17 holds the shadow mask 16 by welding, and a pair of opposed first arm members formed by hollowing a metal plate into a triangular cross section. (A beam) 26 and a pair of opposing second arms formed by hollowing a metal plate, which is disposed orthogonally to the end of the first arm member 26 and has a triangular cross section. The first and second arm members 26, 27 are welded to the end of each
And a connecting member 28 for connecting and fixing between the second arm members 26 and 27 and maintaining the shape thereof.

The second arm member 27 regulates the interval between the first arm members 26 so as to be a predetermined interval, and plays a role of applying tension to the shadow mask 16.

The connecting member 28 is engaged with the above-mentioned stud pin 22 on the outer surface thereof.
An intermediate portion 29 to which the first and second arm members 2 are fixed by spot welding is located at the center.
A fixing portion 30 that is welded and fixed to each of 6, 6 and 27 is provided.

The second arm member 27 has an intermediate portion in the direction opposite to the shadow mask 16 as indicated by the arrow in the drawing, in other words, in the drawing orthogonal to the longitudinal direction of the first arm member 26. An intermediate arm portion 35 displaced downward by a plurality of bent portions 31 to 34 is provided.

That is, the intermediate arm portion 35 is positioned further lower than the lower end surface of the fixed portion A fixed via the first arm member 26 and the connecting member 28 via the connecting member 28.
It is arranged so as to protrude toward the electron gun 18 corresponding to the side opposite to the shadow mask 16.

Here, the "bent portion" is a portion which is bent in the longitudinal direction of the arm member.
The bent portions 31 and 32 and the bent portions 33 and 34 are configured to have different bending directions. In other words, the arm member is configured to substantially have an inflection point at the bent portions 31 to 32 and the bent portions 33 to 34.

The mask frame structure 17 has a vertical axis Y
In this direction, the first arm members 26 are pressurized so as to approach each other to compress the mask frame structure 17, and the shadow mask 16 is preliminarily tensioned in the vertical axis Y direction. The end of the shadow mask 16 is welded to the first arm member 26, and after this welding, the respective loads of the mask frame structure 17 and the shadow mask 16 are removed, so that the shadow mask 16 is extended on the mask frame structure 17. It is suspended.

With such a configuration of the mask frame structure 17, when a tension is applied to the shadow mask 16, the stress applied to the mask frame structure 17 is reduced by the first and second arm members 26 and 27 and the connecting member 28. Is not concentrated only on the welded portion, and the stress is also distributed to the bent portions 31 to 34.

As a result, the maximum stress value of the mask frame structure 17 is remarkably reduced. As a result of performing a calculation by the finite element method and confirming the same, the mask frame 76 has the same size as the conventional mask frame 76 of the same size. Maximum stress value is about 1 /
2 was found to be reduced.

Further, as a result of a trial production test using the mask frame structure 17, in the mask frame 76 of the conventional structure having the same tension, deformation was observed in the welded portion of the frame after passing through the heat process. It was confirmed that no deformation occurred in the mask frame structure 17 of the embodiment.

Therefore, such a mask frame structure 1
The use of No. 7 not only prevents deformation at the welded portion (fixed portion) A, but also allows higher tension to be achieved. The performance of the color picture tube 20, such as vibration characteristics, can also be improved.

FIG. 4 shows a mask frame structure 17 of the present invention.
FIG. 14 is a perspective view showing another embodiment, in which the same components as those described in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the first and second arm members 26 and 27 are connected to the first
And the second arm members 26 and 27 have their ends directly welded and fixed, and the elastic support 23 fitted and fixed to the stud pin 22 also has the first and second arm members 26 and 2.
7 is spot-welded directly to the side surface.

The bent portions 31 to 34 provided on the second arm member 27 are different from those of the above-described embodiment, and are different from the first embodiment.
In the same direction as the longitudinal direction of the arm member 26, the second arm member 27 is bent outward with respect to the second arm member 27 as indicated by an arrow in the drawing. The intermediate arm 35 is located on the same plane, and is located outside the outer surface of the end.

With this configuration, not only the same effects as in the above-described embodiment can be exhibited, but also the first and second arm members 26 and 27 and the inner wall of the skirt portion 21 of the face panel 11 can be accommodated. Therefore, even if the connecting members 28 are not arranged at the four corners, the elastic support 23 can be directly fixed to each of the frame members 26 and 27 by welding, so that the configuration of the mask frame structure 17 itself is simplified. The effect occurs.

In this embodiment, the shadow mask 16 is a dot type in which a round opening 24 is formed. Of course, the shadow type mask is a stripe type in the above embodiment. You can use
Similarly, the dot-type shadow mask 16 exemplified in this embodiment may be applied to the above-described embodiment.

The present invention is not limited to the above-described embodiments, but can be applied to, for example, a multi-neck type having three necks 12 as shown in FIG. The present invention is also applicable to a multi-neck type having the above-described neck 12.

Further, the present invention can be applied not only to the multi-neck type color picture tube 20 but also to the single-neck type generally used color picture tube 20 as shown in FIG. It is possible.

Further, it is possible to combine the respective embodiments, and the mounting position of the elastic support member 23 is not shown at the center of the first and second arm members 26 and 27 shown in FIG. The shape of the elastic support 23 is not limited to the U-shape, but may be an N-shape or the like.

Further, the shape of the opening 24 of the shadow mask 16 is not limited to a round hole or a rectangular shape, but may be any other shape.
Various applications and modifications are possible, for example, the cross-sectional shapes of 6, 27 may be other shapes without being restricted to triangles, and the phosphor screen 14 may have a black matrix configuration.

[0048]

As described above, according to the present invention, the second
By providing a bent portion on the arm member, the stress applied to the mask frame structure when tension is applied to the shadow mask is not concentrated on the welded portions of the first and second arm members, and the bent portion is also provided on the bent portion. By dispersing the stress, it is possible to reduce the maximum stress value, and it is possible to suppress deformation when a thermal load is applied in the manufacturing process. It is possible to provide a mask frame structure and a color picture tube which can be stretched and have improved color shift and vibration characteristics.

If a material having a hollow triangular cross section is used for the first and second arm members, the total weight of the entire mask frame structure can be reduced, and the total weight of the entire color picture tube can be reduced. Can be made lighter.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a multi-neck type color picture tube using a mask frame structure according to the present invention.

FIG. 2 is a perspective view showing a multi-neck type color picture tube.

FIG. 3 is a perspective view showing a mask frame structure according to the present invention.

FIG. 4 is a perspective view showing another embodiment of the mask frame structure.

FIG. 5 is a sectional view showing another embodiment of the color picture tube according to the present invention.

FIG. 6 is a sectional view showing another embodiment of the color picture tube.

FIG. 7 is a sectional view showing a conventional color picture tube.

FIG. 8 is a perspective view showing a conventional mask frame structure.

[Explanation of symbols]

 11: face panel 12: neck 13: funnel 14: phosphor screen 15: electron beam 16: shadow mask 17: mask frame structure 18: electron gun 20: color picture tube 26: first arm member 27: second arm Members 31 to 34: bent portion

Claims (4)

[Claims] 1. A pair of first arm members which are opposed to each other for extending and stretching a shadow mask, and are opposed to each other so as to be substantially perpendicular to the first arm members, and a distance between the first arm members. And a pair of second arm members for providing tension to the shadow mask, wherein a bent portion is formed in the second arm member. 2. The mask frame structure according to claim 1, wherein said bent portion is bent in a direction orthogonal to a longitudinal direction of said first arm member. 3. The mask frame structure according to claim 1, wherein the bent portion is bent in a longitudinal direction of the first arm member. 4. A rectangular face panel having a phosphor screen on an inner surface thereof; a funnel-shaped funnel connected to the face panel; and a funnel disposed in the face panel and having a predetermined distance from the phosphor screen. A pair of opposed shadow masks, a pair of first arm members arranged to hold the shadow mask in a stretched state, and a pair of second arm members fixed to the pair of first arm members arranged to be opposed to each other. A mask frame structure composed of an arm member; and an electron gun that emits an electron beam that scans the phosphor screen through the shadow mask, wherein a bent portion is formed in the second arm member. Color picture tube.