JPH1021842A - Extended mask structure body of color cathode-ray tube and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extended mask structure body for a color cathoderay tube and which is provided with tensile force and can absorb thermal expansion in the case partial thermal expansion occurs in a metal thin strip and to provide a manufacturing method of the body. SOLUTION: Elastic plates 17 are installed successively and respectively in a pair of supporting rods 9, 10, which compose a frame 13 together with a pair of elastic supporting bodies 11, 12, along the longitudinal direction, the fixed ends 17a of the elastic plates 17 having elasticity in the direction in which their free end 17c are parted from the counterpart supporting rods 9 and 10 are fixed in the outside faces of the supporting rods 9, 10 by resistance welding, and a large number of metal thin strips 14 are so arranged in parallel as to bridge both supporting rods 9, 10 to give a grid element body 15. The free ends 17c of respective elastic plates 17 are fixed by seam welding to extend the grid element body 15 between both supporting rods 9, 10 and support them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly, to an extended mask structure used for an extended mask type color cathode ray tube and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 9 is a schematic sectional view showing an extended mask type color cathode ray tube. In the figure, 1 is a tube,
A panel part 4 is provided at the open end of the funnel 3 having the neck part 2.
Are joined. Reference numeral 5 denotes an electron gun arranged in the neck portion 2, 6 denotes a stripe-shaped fluorescent screen formed on the inner surface of the face plate 7 of the panel section 4, and 8 denotes a fluorescent screen 6.
Is an expansion mask structure that is disposed in the panel unit 4 so as to oppose the electron beam and determines the arrival position of the electron beam. The light is projected onto the phosphor stripe of the corresponding color.

FIG. 10 shows, for example, Japanese Patent Publication No. 59-18826.
FIG. 1 is a perspective view showing a conventional expanding mask structure disclosed in Japanese Patent Application Laid-Open Publication No. H10-86,004. The unfolded mask structure 8 includes a pair of support rods 9 and 10 which are arranged at a predetermined interval in parallel and opposed to each other, and a pair of support rods 9 and 10 which are attached between the Bessel points or positions in the vicinity thereof. A grid element 15 having a number of metal strips 14 provided in parallel so as to extend between two support rods 9 and 10 is stretched on a frame 13 including elastic supports 11 and 12. And an electron beam passage hole 16 through which an electron beam passes between adjacent metal strips 14.
Are formed. The extension mask structure 8 usually has through holes formed at the free ends of elastic holding members (not shown) attached to one of the support rods 9 and the two elastic supports 11 and 12, respectively. At a predetermined position in the panel portion 4 by fitting a stud pin (not shown) provided on the
Attached with point support.

In the extended mask type color cathode ray tube having such a structure, about 80% of the electron beam emitted from the electron gun 5 at the time of its operation does not pass through the electron beam passage hole 16 of the grid element 15 and the metal strip. 14, the temperature of the grid body 15 is raised by about 20 to 40 ° C., the grid body 15 thermally expands, and the metal strips 14 elongate (loose).
This lowers the color purity of the color cathode ray tube. In order to absorb the elongation of the metal strip 14 due to the thermal expansion, when the grid element 15 is stretched over the support rods 9 and 10, that is, when the grid element 15 is attached to the support rods 9 and 10, both support rods 9 and 10 are supported. A load is applied to the rods 9 and 10 from outside thereof, that is, from both sides of the support rods 9 and 10 opposite to each other, and the elastic support bodies 11 and 12 are bent while applying a load to the support rods 9 and 10. The tension is applied to the metal strip 14 by the restoring force of the two elastic supports 11 and 12 when the grid element body 15 is welded and the above-mentioned load is released, whereby the grid during the operation of the color cathode ray tube is provided. Prime field 1
5 is prevented from lowering in color purity due to thermal expansion.

Actually, when a video signal is input such that the amount of electron beam incident on the spreading mask structure 8 becomes substantially uniform continuously over the entire screen of the cathode ray tube, the temperature of the grid element 15 rises entirely. Therefore, the extension ΔL of the metal strip 14 due to the thermal expansion of the grid element 15 causes the two support rods 9, 10 to move outward by the restoring force of the two elastic supports 11, 12 as shown by broken lines in FIG. 11. Since it is spread and absorbed so as to apply tension to the entire surface of the grid element 15, color purity does not decrease.

[0006]

The conventional expanding mask structure 8 is constructed as described above, and the grid element 15 is directly supported by the two support rods 9 and 10 so that only the displacement of the two support rods 9 and 10 is achieved. Since a tension is applied to the image, a discontinuous image pattern on the screen of the cathode ray tube, such as a vertical line shown in FIG. 12A or a cross hatch shown in FIG. When a video signal of a video pattern in which the amount of the incident electron beam is significantly different in the unit of several tens of the strips 14 is input, a difference occurs in the extension of the metal strips 14, and the extension is applied to each metal strip 14. Since the tension is governed by the metal strips 14 having a small elongation, the required tension is not applied to the metal strips 14 having a large elongation, causing a problem that color shift occurs. In other words, the conventional expanding mask structure 8 can uniformly apply tension to the metal strips 14 fixed to the support rods 9 and 10, but does not respond to local thermal expansion of the metal strips 14. There was a problem that tension could not be applied locally.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Even if there is a local thermal expansion of a metal strip, it can absorb the thermal expansion and apply tension to the metal strip. It is an object of the present invention to provide a color cathode ray tube expansion mask structure capable of preventing color misregistration even when a video signal of a discontinuous video pattern is input on a screen and a method of manufacturing the same.

[0008]

According to the present invention, there is provided an extended mask structure for a color cathode ray tube according to the present invention, comprising a pair of support bars opposed to each other at a predetermined interval, and a predetermined interval between the two support bars. A pair of resilient supports, which are attached and bias the two support rods away from each other, and a plurality of metal strips in a direction intersecting with the two support rods are provided in parallel, and the grid element is supported by being stretched between the two support rods. The grid element is stretched through a plurality of stretching members that are sequentially arranged along the length direction of each of the support rods and that support the metal strips divided into a plurality of units. It is.

Further, the stretching member is formed of an elastic plate having a fixed end fixed to the support rod and having a free end in a direction away from the opposing support rod, and a grid element body is supported on the free end of the elastic plate. Is what it is.

[0010] Further, the metal strip is divided into a plurality of units and supported on the free ends of the respective elastic plates.

Each elastic plate has a fixed end connected and integrated.

Still further, according to the present invention, there is provided a method for manufacturing an expanded mask structure for a color cathode ray tube, comprising the steps of: forming a frame comprising a pair of support rods arranged opposite to each other and a pair of elastic supports attached between the support rods. Forming, and a step of sequentially arranging a plurality of elastic plates each having elasticity in a direction in which the fixed ends are fixed to the support rods and the free ends of the support rods are separated from the opposing support rods in the length direction thereof. A grid element in which a number of metal strips in a direction intersecting both support rods are arranged in parallel in the outer frame, and slits for dividing the metal strips into a plurality of units extend beyond the end of the metal strip into the outer frame. Forming the body and slitting the outer frame of the grid element with the elastic plate being displaced so that its free end approaches the opposing support rod while pressing the frame so that both support rods approach each other Within the extension range of It is obtained by a step of fixing the free end of the elastic plate.

[0013] The method further comprises a step of fixing the outer frame of the grid element to the free end of each elastic plate, and then cutting and removing the outer frame portion of the grid element outside the fixing portion within the extension range of the slit. It is a thing.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a perspective view showing an extended mask structure according to Embodiment 1 of the present invention, and FIGS. 2 and 3 are a side view and a front view, respectively. In the drawing, reference numerals 9 and 10 denote a pair of support rods made of, for example, stainless steel SUS403 and arranged in parallel with each other at a predetermined interval, and 11 and 12 denote, for example, chromium molybdenum steel SCM.
415 is a pair of elastic supports attached at predetermined intervals between the vessel points of the two support rods 9 and 10 or positions near the vessel points, and constitutes the frame 13 together with the two support rods 9 and 10. Reference numeral 17 denotes an elastic plate which constitutes a tension member. As shown in FIG. 4, a vertical fixed end 17a, an elastic portion 17b extending obliquely from the fixed end 17a, and an elastic end 17b extending from the end of the elastic portion 17b. The elastic part 17 is almost at a right angle.
b has a free end 17c extending in the direction opposite to the inclination direction. The elastic plate 17 is made of, for example, stainless steel SUS631 as a material, which is heat-treated at 450 ° C. for 1 hour and precipitated and hardened.
It may be formed of another spring material such as S304, in which case no heat treatment is required.

The elastic plate 17 includes a fixed end 17a and an elastic portion 17
b faces the outer surfaces of the support rods 9 and 10 and the free ends 17 c face the upper surfaces of the support rods 9 and 10.
Each is sequentially arranged at a pitch of about 5 mm along the length direction thereof, and the fixed end 17a is fixed to the outer surfaces of the support rods 9 and 10 by resistance welding or the like, and the free end 17c is opposed to the support rod 9 or It is attached so as to have elasticity in a direction away from 10. That is, the elastic plate 17 attached to the support rod 9 has elasticity in a direction in which the free end 17c is away from the support rod 10, and the elastic plate 1 attached to the support rod 10
7 has elasticity in a direction in which the free end 17c is separated from the support rod 9. Reference numeral 18 denotes a fixing point of the fixed end 17a to the support rods 9, 10.

A plurality of metal strips 14 are provided in parallel so as to extend between the support rods 9 and 10, and an electron beam passage hole 1 through which an electron beam passes between the metal strips 14.
6 is formed of, for example, 0.1 mm-thick rimed steel grid body, and both end sides perpendicular to each metal strip 14 are fixed to the free end 17c of each elastic plate 17 by seam welding or the like. The supporting rods 9 and 10 are supported by being stretched. Reference numeral 19 denotes a fixing point of the grid element 15 to the free end 17c of the elastic plate 17. Stretching the grid body 15,
That is, the grid element 1 is connected to the free end 17c of the elastic plate 17.
5 is fixed to each elastic plate 17 from outside thereof.
That is, a load is applied to the support rods 9 and 10 from the side opposite to the side facing each other to bend and the elastic portion 17b is bent.
10 and a load is further applied to deflect both elastic supports 11 and 12.
The grid element body 15 is seam-welded to the free end 17c of the seventh. Thereafter, when the load is released, the two elastic supports 1
The grid element 15, that is, each metal strip 14 is stretched by the restoring force of the first and second members 12, and each elastic plate 17 has elasticity in a direction in which the free end 17 c is separated from the supporting rod 9 or 10 opposed thereto. Become.

An expansion mask structure used for an expansion mask type color cathode ray tube generally has several thousand metal strips 14 at a pitch of about 0.25 mm, and in the present embodiment, 20 metal strips 14 per elastic plate 17 are used. Of metal strips 14 are separately supported. In the same manner as in the prior art, this expanding mask structure has a through hole formed at the free end of an elastic holding member (not shown) attached to one support rod 9 and both elastic supports 11 and 12, respectively. The panel is fitted to a stud pin (not shown) provided on the inner side wall and is attached to a predetermined position in the panel section 4 by so-called three-point support.

According to the extended mask structure having such a configuration, when a video signal is input such that the amount of incident electron beam is substantially uniform continuously over the entire screen of the cathode ray tube,
Since the entire temperature of the grid element 15 rises, the expansion of the metal strip 14 due to the thermal expansion of the grid element 15 is performed in the same manner as in the conventional example by the restoring force of the elastic supports 11 and 12 so that the support rods 9 and Since 10 is uniformly spread outward and acts to impart tension to the entire surface of the grid element 15 and is absorbed, color purity does not decrease. Further, as shown by a vertical line shown in FIG. 12A or a cross hatch shown in FIG. 12B, a discontinuous image pattern on the screen of the cathode ray tube, in particular, an incident electron beam in units of several tens of metal strips 14. An image signal of an image pattern having a significantly different amount is input and a metal strip 14 is input.
Even if there is a difference in the extension of the metal strip 14, the elastic plate 17 supporting the metal strip 14 of the large extension as shown in FIG.
Since the metal strip 14 is bent in a direction away from 10 to apply tension to the metal strip 14 and absorb the local elongation of the metal strip 14, the color purity does not decrease.

Embodiment 2 FIG. 6 is a front view showing an extended mask structure according to a second embodiment of the present invention, and FIG. 7 is a perspective view showing an elastic plate which is a stretching member which is a feature of the second embodiment. In the expansion mask structure 8 of the second embodiment, the fixed ends 17a of all the elastic plates 17 necessary for the support rods 9 and 10 are connected and integrated, and only the elastic portion 17b and the free end 17c are divided into a comb shape. Other configurations are the same as those of the first embodiment. The face plate 7 of the panel portion 4 is usually a curved surface, and the support rods 9 and
10 is also curved, the pitch of each elastic plate 17 is selected in consideration of the curvature of the support rods 9 and 10, and the connection direction shape of the integrated fixed end 17a is determined according to the curvature of the support rods 9 and 10. And the surface of the free end 17c is formed into a curved surface according to the curvature of the support rods 9 and 10 as necessary.

According to the expansion mask structure having such a structure, it is possible to absorb the local elongation of the metal strip 14 as well as to adjust the curvature of the support rods 9 and 10 as in the first embodiment. It is easy to position the elastic plate 17 by
It has the advantage of excellent workability.

Third Embodiment FIG. 8 is a plan view of a main part showing a stage in the course of manufacturing an extended mask structure according to a third embodiment of the present invention.
Also, only the free end 17c of the elastic plate 17 is shown.
Similar to the first and second embodiments, the grid element 15 has a large number of metal strips 14 in the direction intersecting with the support rods 9 and 10 provided in parallel in the outer frame 20. An electron beam passage hole 16 is formed between them. Further, a slit 21 for dividing the metal strip 14 into a plurality of units supported by the elastic plate 17 extends beyond the end of the metal strip 14 in the outer frame 20. Is formed. That is, the electron beam passage hole 16 between the metal strips 14 divided into a plurality of units is extended into the outer frame 20 to form a slit 21, and the slit 21 is fixed to the free end 17 c of the elastic plate 17. It extends beyond point 19. The outer frame 20 has an elastic plate 1
Trimming line 2 that traverses each slit 21 between a fixing point 19 of free end 7 and free end 17c and end of slit 21
2 are formed. Since the grid element 15 is formed by etching a thin plate material, it is easy to form the slits 21 at the same time.

The production of an extended mask structure using the grid element 15 having such a configuration is performed as follows.
First, a pair of support rods 9 and 10 and a pair of elastic support bodies 11 and
A frame 13 is formed, and the fixed ends 17a of the elastic plates 17 are fixed to the outer surfaces of the support bars 9 and 10 by resistance welding or the like, and the elastic plates 17 are attached to the support bars 9 and 10. In parallel with this, after the grid element 15 having the above-described configuration is formed, a load is applied to each elastic plate 17 from the outside thereof to bend the elastic plate 17, and the free end 17 c of each elastic plate 17 is opposed to the support rod 9.
Alternatively, the elastic portions 17b are brought into contact with the outer surfaces of the support rods 9 and 10 by being displaced so as to approach the support rods 9, and the elastic support bodies 11 and 12 are further deflected by further applying a load so that the support rods 9 and 10 are bent. Press the frame 13 so as to approach each other,
In this state, the outer frame 20 of the grid element body 15 is fixed to the free end 17c of each elastic plate 17 by seam welding within the extension range of the slit 21. Thereafter, when the load is released, the grid element 1 is restored by the restoring force of the two elastic supports 11 and 12.
5, that is, each metal strip 14 is stretched, and each elastic plate 17 is provided with a support rod 9 or 1 against which a free end 17c is opposed.
It will have elasticity in the direction away from zero. Then
By cutting and removing unnecessary portions of the outer frame 20 along the trimming line 22, a stretched mask structure is obtained. The elastic plates 17 may be attached to the support rods 9 and 10 before the frame 13 is formed, or the unnecessary portions of the outer frame 20 may be cut and removed before the load on the frame 13 is released.

According to the stretched mask structure thus obtained, the divided metal strips 14 are supported by the individual elastic plates 17 completely separated from the adjacent units for each of a plurality of units. Since there is no mutual interference between units, the elastic plate 17 may have relatively low elasticity, and
4 has an advantage that the response to thermal expansion is fast. In addition, if the unnecessary portion of the outer frame 20 remains in the completed expanded mask structure, various inconveniences occur. However, according to the above-described manufacturing method, the metal strips 14 that are separated without leaving the unnecessary portion of the outer frame 20 remain. It is possible to easily obtain an extended mask structure supported by each elastic plate 17 completely separated from the adjacent unit for each of the plural units.

[0024]

According to the color cathode ray tube expansion mask structure of the present invention, a pair of support bars which are opposed to each other at a predetermined interval, and are attached at a predetermined interval between the two support bars. A pair of elastic supports for biasing both support rods in a direction away from each other, and a grid element body provided with a number of metal strips in a direction intersecting both support rods arranged in parallel and supported by being stretched between both support rods; Since the grid element is stretched through a plurality of stretching members that are sequentially arranged along the length direction of each of the two support rods and that support the metal strips divided in units of a plurality, Even if there is thermal expansion of a metal strip, it can absorb the thermal expansion and apply tension, preventing color shift even when a video signal of a discontinuous video pattern is input on the screen of the cathode ray tube. be able to.

The stretching member is constituted by an elastic plate having a fixed end fixed to the support rod and having a free end separated from the opposing support rod in an elastic direction, and the grid element is supported on the free end of the elastic plate. With this configuration, it is possible to easily realize a configuration in which the metal strip is divided into a plurality of pieces and tension is applied.

Furthermore, since the metal strip is divided into a plurality of units and supported on the free ends of the respective elastic plates, mutual interference between adjacent units is eliminated, so that the elastic plates may have relatively weak elasticity. There is an effect that the response to the thermal expansion of the strip is quick.

Also, since the fixed ends of the elastic plates are connected and integrated, it is easy to position the elastic plates in accordance with the support rods, and the workability is excellent.

Further, a step of forming a frame comprising a pair of support rods arranged opposite to each other and a pair of elastic supports attached between the two support rods, and fixing ends of the support rods to the support rods respectively. A step of sequentially arranging a plurality of elastic plates having elasticity in a direction in which the free ends are separated from the opposing support rods along the longitudinal direction thereof, and a metal strip in a direction intersecting both support rods in the outer frame. A step of forming a grid element extending in the outer frame beyond the end of the metal strip by forming a plurality of parallel slits for dividing the metal strip into a plurality of units, so that both support rods approach each other. A step of fixing the outer frame of the grid element body to the free end of each elastic plate within the extension range of the slit while pressing the frame and displacing each elastic plate so that its free end approaches the support rod facing the same. To manufacture an expanded mask structure Since in so that the stretched mask structure separate from the units adjacent to each plural units of segmented metal tracks can be easily manufactured.

After the outer frame of the grid body is fixed to the free end of each elastic plate, the outer frame portion of the grid body outside the fixed portion is cut and removed within the extension of the slit. Therefore, it is possible to obtain a stretched mask structure in which unnecessary portions of the outer frame do not remain.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an extension mask structure of a color cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a side view showing an extension mask structure of the color cathode ray tube according to the first embodiment of the present invention.

FIG. 3 is a front view showing an extension mask structure of the color cathode ray tube according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a stretching member (elastic plate) used in Embodiment 1 of the present invention.

FIGS. 5A and 5B are a schematic plan view and a sectional view for explaining the operation of the expansion mask structure of the color cathode ray tube according to the first embodiment of the present invention.

FIG. 6 is a front view showing an extension mask structure of a color cathode ray tube according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a stretching member (elastic plate) used in Embodiment 2 of the present invention.

FIG. 8 is a main part plan view showing a stage in the course of manufacturing the stretched mask structure according to Embodiment 3 of the present invention;

FIG. 9 is a schematic cross-sectional view showing an expansion mask type color cathode ray tube.

FIG. 10 is a side view showing a conventional expansion mask structure of a color cathode ray tube.

FIG. 11 is a schematic front view for explaining the operation of a conventional expanded mask structure of a color cathode ray tube.

FIG. 12 is a diagram showing an example of a video pattern on a screen of a cathode ray tube.

[Explanation of symbols]

8 Expanded mask structure, 9,10 Support rod, 11,1
2 elastic support, 13 frame, 14 metal strip,
15 grid body, 17 stretching member (elastic plate),
17a fixed end, 17b elastic part, 17c free end,
20 outer frame, 21 slit

Claims (6)

[Claims] 1. A pair of support rods arranged opposite each other at a predetermined interval, and a pair of elastic supports mounted at a predetermined interval between the two support rods to bias the two support rods away from each other. A plurality of metal strips in a direction intersecting the two support rods are provided in parallel, and a grid element is supported by being stretched between the two support rods. A color cathode ray tube characterized in that it is stretched through a plurality of stretching members that are sequentially arranged along the length direction of each bar and that support the metal strips divided in units of a plurality of bars. Extension mask structure. 2. A stretching member comprising an elastic plate having a fixed end fixed to a support bar and having a free end elastic in a direction away from the opposing support bar, and a grid element body supported on the free end of the elastic plate. The expanded mask structure of a color cathode ray tube according to claim 1, wherein: 3. The expansion mask structure of a color cathode ray tube according to claim 2, wherein a plurality of metal strips are divided and supported on free ends of the respective elastic plates. 4. The expansion mask structure of a color cathode ray tube according to claim 2, wherein each elastic plate has a fixed end connected and integrated. 5. A pair of support bars which are opposed to each other at a predetermined interval, and a pair of elastic supports which are mounted at a predetermined interval between the two support bars and bias the two support bars away from each other. And a step of forming a frame consisting of a plurality of elastic plates having elasticity in a direction in which the fixed ends are fixed to the support rods and the free ends are separated from the opposing support rods, respectively, along the length of the support rods. A step of sequentially arranging, and a plurality of metal strips in a direction intersecting the two support rods are arranged in parallel in an outer frame, and a slit for dividing the metal strips into a plurality of units extends beyond the end of the metal strip. Forming a grid element extending in the frame, and pressing the frame so that the two support rods approach each other and displacing each elastic plate such that its free end approaches the opposing support rod. Above Fixing the outer frame of the grid element body to the free end of each of the elastic plates within the extension range of the slit. 6. A step of fixing the outer frame of the grid element to the free end of each elastic plate, and cutting and removing the outer frame portion of the grid element outside the fixing portion within the extension range of the slit. The method for manufacturing a color cathode ray tube expanded mask structure according to claim 5, further comprising: