JPH117902A - Color cathode-ray tube of spread mask system, its manufacture and manufacture of spread mask used in color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube of a spread mask system and its manufacturing method which can suppress a tension decline of a grid body even after a heat-treatment process in its manufacture, and also a manufacturing method of a spread mask used in the color cathode-ray tube. SOLUTION: A spread mask is provided by bridging and spreading an aperture grille body structure 15, on which many grid bodies 14 are installed in parallel as they connect both supporting rods 9 and 10, on a frame comprising a pair of supporting rods 9 and 10 installed oppositely in parallel with a designated interval and a pair of elastic supporting bodies 11 and 12 installed between the both supporting rods 9 and 10 with an interval. In this case, both ends of the both supporting rods 9 and 10 are connected respectively with a metal plate 16 having a smaller thermal expansion coefficient that that of the aperture grille body structure 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 is a schematic sectional view showing an extended mask type color cathode ray tube. In the figure, reference numeral 1 denotes a tube, which is formed by joining a panel portion 4 to an open end of a funnel 3 having a neck portion 2. Reference numeral 5 denotes an electron gun arranged in the neck portion 2, 6 denotes a stripe-shaped fluorescent surface formed on the inner surface of the face plate 7 of the panel portion 4, and 8 denotes an electron gun disposed in the panel portion 4 so as to face the fluorescent surface 6. An expansion mask which is a color selection electrode for determining the arrival position of the electron beam, and emits an electron beam emitted from the electron gun 5 corresponding to each color of, for example, red, green and blue to a phosphor of a corresponding color on the phosphor screen 6. It strikes on the stripe.

FIG. 5 is a perspective view showing a conventional spreading mask. The stretching mask 8 includes a pair of support rods 9 and 10 which are arranged opposite to each other in parallel at a predetermined interval, and a pair of elastic rods attached between the Bessel points of the support rods 9 and 10 or positions in the vicinity thereof. An aperture grille structure 15 in which a number of grid elements 14 are provided in parallel so as to extend between both support rods 9 and 10 is stretched on a frame 13 composed of supports 11 and 12. The slit through which the electron beam passes is formed between adjacent grid elements 14. The extension mask 8 usually has through holes provided at the free ends of elastic holding members (not shown) attached to one support rod 9 and both elastic supports 11 and 12 on the inner wall of the panel portion 4. It is fitted to a provided stud pin (not shown) and is attached to a predetermined position in the panel section 4 by so-called three-point support.

[0004] The spreading mask 8 having such a configuration is manufactured as follows. First, a load is applied to both support rods 9, 10 from outside thereof, that is, from both sides opposite to each other, so that both support rods 9, 10 are brought closer to each other by applying a load. The aperture grilles 15 are welded to the support rods 9 and 10 in this state. Thereafter, the above-mentioned load is released, and the tension is applied to each grid element body 14 by stretching the aperture grille structure 15 by the restoring force of the two elastic supports 11 and 12 at that time. Next, in order to prevent heat radiation, generation of rust, and the like, a blackening treatment is performed at about 460 ° C. for 10 to 20 minutes.

[0005] The expansion mask 8 manufactured in this manner.
Is formed in the panel section 4 after forming the phosphor screen 6, and for welding the funnel 3 and the panel section 4,
A frit sealing process is performed at about 460 ° C. for 40 to 50 minutes. Finally, in order to evacuate the inside of the tube 1, 35
An exhaust process is performed at about 0 ° C. for 20 to 30 minutes. The material of the support rods 9 and 10, the elastic supports 11 and 12, and the aperture grille structure 15 is mostly iron (F).
e).

[0006]

However, in the conventional expanded mask type color cathode ray tube, the tension of the aperture grille structure 15 is reduced during manufacturing, which is a problem in quality. This is due to the heat and tension at the time of the above-described blackening, frit sealing, and exhaust processing, and the grid element 14
This is because a creep phenomenon occurs and the wire expands. The decrease in the tension of the grid body 14 was 57 kg / mm ² after the assembling of the stretching mask, but it was 38 kg after the blackening treatment.
/ Mm ² , which occurs after frit sealing as 33 kg / mm ² . As described above, in the stretching mask in which the creep phenomenon occurs and the tension is reduced, the grid element body 14 largely vibrates due to a light impact from the outside, which causes a color shift of the screen. Conventionally, in order to solve such a problem, for example, measures such as increasing the pressure of the turnbuckle of the frame 13 or increasing the rigidity of the aperture grille structure 15 have been considered, but a sufficient effect is still obtained. Did not.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an extended mask type color cathode ray tube capable of suppressing a decrease in the tension of a grid element body even after a heat treatment step during manufacturing, and a method of manufacturing the same. It is another object of the present invention to obtain a method of manufacturing an expansion mask used for the color cathode ray tube.

[0008]

According to the present invention, an extended mask type color cathode ray tube according to the present invention is provided with a pair of support bars which are opposed to each other at a predetermined interval, and is 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 an aperture grille structure provided with a number of grid elements arranged in parallel in a direction intersecting with both support rods, and supported by being stretched between the support rods. And an expansion mask having a thermal expansion coefficient smaller than the thermal expansion coefficient of the aperture grille structure and having a connecting member for connecting the pair of support rods in the longitudinal direction of the grid element body.

In addition, the extended mask type color cathode ray tube according to the present invention has a pair of connecting members for connecting between both ends of the pair of support rods.

Further, in the expanded mask type color cathode ray tube according to the present invention, no tension is applied to the connecting member.

Further, in the extended mask type color cathode ray tube according to the present invention, the connecting member is made of a metal plate, and the plate thickness is 0.1 mm.
The alloy has a composition of an Fe-Ni alloy having a width of from 0.05 mm to 0.8 mm and a width of from 2 mm to 30 mm.

Still further, according to the method of manufacturing an extended mask type color cathode ray tube according to the present invention, there is provided a method of manufacturing a color cathode ray tube having a thermal expansion coefficient smaller than a thermal expansion coefficient of an aperture grille assembly. A step of mounting an expansion mask provided with a connecting member for connecting the expansion mask inside the tube of the color cathode ray tube, a step of performing high-temperature processing on the color cathode-ray tube to which the expansion mask is mounted, and after this high-temperature processing step, heating the connecting member. And removing the tension of the connecting member.

[0013] In the method of manufacturing an expanded mask type color cathode ray tube according to the present invention, the heating process of the connecting member is high-frequency heating, and the connecting member includes a low-resistance member having a lower electric resistance value than the connecting member. It has been polymerized.

Still further, according to the method of manufacturing a stretched mask according to the present invention, a step of forming a frame including a pair of support rods and a pair of elastic supports, and an aperture provided with a number of grid elements in parallel are provided. A step of forming a grille structure, a step of fixing the aperture grille structure to the support rods in a state where the frame is pressed so that both support rods approach each other, and a step of pressing the frame after fixing the aperture grille structure to the support rods And connecting the pair of support rods with a connecting member having a smaller coefficient of thermal expansion than the coefficient of thermal expansion of the aperture grille structure.

[0015] Further, according to the method of the present invention, there is provided a method of manufacturing a stretch mask, comprising the steps of forming a frame comprising a pair of support rods and a pair of elastic supports, and an aperture grill provided with a large number of grid elements in parallel. A step of forming a structure and fixing the aperture grille structure to the support rods in a state where the frame is pressed so that both support rods approach each other, and the space between the pair of support rods is smaller than the thermal expansion coefficient of the aperture grille structure. Connecting with a connecting member having a coefficient of thermal expansion,
The method includes a step of releasing the pressurization of the frame to which the aperture grille structure and the connecting member are attached.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a perspective view showing an expansion mask according to Embodiment 1 of the present invention. In the figure, 9 and 10
Is a pair of support rods arranged opposite to each other at a predetermined interval in parallel with each other, and 11 and 12 are attached at predetermined intervals between the Bessel points of the support rods 9 and 10 or positions in the vicinity thereof, and both support rods 9 are provided. , 10 are biased in a direction away from each other, and constitute a frame 13 together with the two support rods 9, 10. 15 is both support rods 9, 1
A plurality of grid element bodies 14 are provided in parallel so as to extend between 0, and an aperture grille structure in which a slit through which an electron beam passes is formed between adjacent grid element bodies 14. Is fixed to both support rods 9 and 10 by seam welding or the like.
The support rods 9 and 10 are supported by being stretched. A pair of members 16 has a thermal expansion coefficient smaller than the thermal expansion coefficient of the aperture grille structure 15, and constitutes a pair of connecting members for connecting both ends of both support rods 9 and 10 in the longitudinal direction of the grid element 14. It is a metal plate, for example, a Fe-Ni alloy (N
i is 28 to 34% by weight). The support rods 9, 1
Most of the materials of the elastic support members 11 and 12 and the aperture grille structure 15 are iron (Fe).

The stretching mask 8 having such a configuration is manufactured as follows. First, a frame 13 including a pair of support rods 9 and 10 and a pair of elastic supports 11 and 12 is formed. In parallel with this, after forming the aperture grille structure 15 having the above-described configuration, the support bars 9 and 10 are attached to the support bars 9 and 10 from outside thereof.
That is, a load is applied from the opposite side of the two support rods 9 and 10 to bend the two elastic supports 11 and 12 so that the two support rods 9 and 10 approach each other. The aperture grille structure 15 is seam-welded to 9 and 10. Thereafter, the above-mentioned load is released, and the tension is applied to each grid element body 14 by stretching the aperture grille structure 15 by the restoring force of the two elastic supports 11 and 12 at that time. Next, a metal plate 16 is fixed to both ends of both support rods 9 and 10 by seam welding or the like, and both ends of both support rods 9 and 10 are connected by a pair of metal plates 16 respectively. At this time, no tension is applied to the metal plate 16. Finally, in order to prevent heat radiation, rust, etc.
A blackening process is performed for 0 to 20 minutes.

As shown in FIG. 4, the expanded mask 8 manufactured as described above forms the phosphor screen 6 and then the panel section 4
In order to weld the funnel 3 and the panel unit 4 together, a frit sealing process is performed at about 460 ° C. for 40 to 50 minutes. Finally, in order to evacuate the inside of the tube 1, an exhaust process is performed at about 350 ° C. for 20 to 30 minutes.

According to the spreading mask 8 provided with the metal plate 16 as described above, when subjected to high-temperature processing such as blackening processing, frit sealing processing, exhaust processing, etc., the aperture grille structure 15, the support rod 9, 10, elastic support 11,
12, the metal plate 16 expands, however, since the coefficient of thermal expansion of the metal plate 16 is smaller than the coefficient of thermal expansion of the aperture grille assembly 15, tension concentrates on the metal plate 16,
The tension of the grid element 14 decreases. Therefore, the occurrence of creep of the grid body 14 in high-temperature processing such as blackening processing, frit sealing processing, and exhaust processing is suppressed.

FIG. 2 shows the results of measuring the tension of the grid element 14 at the center A and the end B of the aperture grille structure 15 before and after the high-temperature treatment, together with a comparative example (conventional example). FIG. In the figure, curve I is the tension of the grid body 14 before the high-temperature treatment, curve II is the tension of the grid body 14 after the high-temperature treatment according to the present embodiment, and curve III.
Indicates the tension of the grid body 14 after the high-temperature treatment according to the comparative example. From this figure, the aperture grille structure 1
5, at the end B, the rate of decrease in the tension of the grid body 14 after the high-temperature treatment is smaller in the present embodiment (curve II) than in the comparative example (curve III), and therefore, creep occurs. Is suppressed. As a result, the tension of the grid body 14 after the high-temperature treatment is close to the state before the high-temperature treatment (curve I). The color shift of the screen is particularly caused by the grid element 14 at the end B of the aperture grille structure 15.
Therefore, it is important to suppress a decrease in the tension of the grid element body 14 at the end B to a small extent.

When the tension applied to the grid element 14 of the aperture grille structure 15 was analyzed in combination with the metal plate 16, the use of a Fe—Ni alloy plate as the metal plate 16 revealed that the thermal expansion coefficient characteristics and the material availability were high. Proved the best from the ease of Also, the width of the metal plate 16 is 2 mm,
When the plate thickness is smaller than 0.05 mm, the effect of suppressing the creep of the grid element 14 constituting the aperture grille structure 15 is small. Conversely, when the width is 30 mm and the plate thickness is larger than 0.8 mm, the grid The effect of suppressing the creep of the element body 14 reaches a substantially saturated state. Therefore, using a Fe-Ni alloy plate material, the width is 2 to 30 mm and the plate thickness is 0.05.
It is preferable to set it to 0.8 mm.

Embodiment 2 FIG. The second embodiment is different from the first embodiment only in the method of attaching the metal plate 16 at the time of manufacturing the spreading mask 8. That is, the spreading mask 8 is manufactured as follows. First, a frame 13 including a pair of support rods 9 and 10 and a pair of elastic supports 11 and 12 is formed. In parallel with this, after forming the aperture grille structure 15 having the above-described configuration, the two support rods 9 and 10 are attached to the support rods 9 and 10 from outside, that is, both the support rods 9 and 10 are formed.
The two elastic support members 11, 10 are applied with a load from the opposite side to the two opposing sides so that the two support rods 9, 10 approach each other.
In this state, the aperture grille structure 15 is seam-welded to both support rods 9 and 10, and a metal plate 16 is fixed to both ends of both support rods 9 and 10 by seam welding or the like. , 10 are connected by a pair of metal plates 16. . Thereafter, the above-mentioned load is released, and the tension is applied to each grid element body 14 by stretching the aperture grille structure 15 by the restoring force of the two elastic supports 11 and 12 at that time. At this time, tension is applied to the metal plate 16.

According to the expanded mask 8 manufactured as described above, since tension is applied to both the grid element body 14 and the metal plate 16 before the high-temperature processing, the expansion mask 8 according to the first embodiment is used at the time of the high-temperature processing. Tension concentrates on the metal plate 16 at a lower temperature than in the case. Therefore, there is an advantage that the effect of suppressing the generation of creep of the grid element body 14 in the high-temperature treatment is increased.

Embodiment 3 FIG. FIG. 3 is a partially cutaway view illustrating a method of manufacturing an extended mask type color cathode ray tube according to the third embodiment. The third embodiment is characterized in the processing after the expansion mask 8 is incorporated in the panel section 4 and subjected to high-temperature processing such as frit sealing processing and exhaust processing. That is, after the high-temperature treatment such as the exhaust treatment is completed,
An eddy current is applied to the metal plate 16 from the outside of the tube 1 by the high-frequency coil 17 to heat and anneal, and the metal plate 16 is creeped to remove the tension of the metal plate 16.

In the expanded mask type color cathode ray tube manufactured through the high temperature treatment according to the first and second embodiments, both the grid element 14 and the metal plate 16 may be under tension. Metal plate 1 upon completion of cathode ray tube
If the tension is applied to 6, the grid element 14 cannot be sufficiently tensioned. However, Embodiment 3
According to this, since the tension applied to the metal plate 16 can be removed, a sufficient tension can be applied to the grid element body 14.

As shown in FIG. 3, if a low resistance metal plate 18 constituting a low resistance member having a lower electric resistance than the metal plate 16 is used, the high frequency coil 1
When high-frequency heating is performed in step 7, an eddy current flows through the low-resistance metal plate 18 so that the metal plate 16 can be heated and annealed. Annealing can be performed. The metal plate 16 is Fe-
In the case of a Ni-based alloy, F is used as the low-resistance metal plate 18.
e-plate can be given.

[0027]

According to the extended mask type color cathode ray tube according to the present invention, the pair of support rods are connected in the longitudinal direction of the grid element having a thermal expansion coefficient smaller than that of the aperture grille structure. Since the connecting member is provided on the spreading mask, it is possible to suppress the occurrence of the creep phenomenon of the grid body when subjected to high-temperature processing such as blackening processing, frit sealing processing, and exhaust processing, and to reduce the tension of the grid body. The drop can be prevented. Accordingly, it is possible to prevent the grid element from vibrating largely due to a light external impact, and to prevent the occurrence of color shift on the screen.

Further, since a pair of connecting members for connecting the both ends of the pair of support rods are provided, it is possible to prevent a decrease in the tension of the grid element in a well-balanced manner over the entire area of the aperture grille structure. it can.

Further, since no tension is applied to the connecting member, a sufficient tension can be applied to the grid element.

The connecting member is made of a metal plate and has a thickness of 0.05 mm to 0.8 mm, a width of 2 mm to 30 mm,
Since the composition is an Fe—Ni-based alloy, the creep phenomenon of the grid body can be effectively suppressed.

Further, according to the method of manufacturing an extended mask type color cathode ray tube according to the present invention, a pair of support members having a thermal expansion coefficient smaller than that of an aperture grille structure and extending in the longitudinal direction of the grid element body. A step of attaching an expansion mask provided with a connecting member for connecting the rods to the inside of the color cathode ray tube, a step of subjecting the color cathode ray tube to which the extension mask is attached to high temperature treatment, and after this high temperature treatment step, the connecting member is removed. Since a step of removing the tension of the connecting member by heating is provided, even if tension is applied to both the grid element body and the connecting member after the high-temperature processing step, the tension applied to the connecting member is removed. And a sufficient tension can be applied to the grid element body.

Further, since the heating process of the connecting member is high-frequency heating, and the connecting member is superimposed with a low-resistance member having an electric resistance lower than that of the connecting member, the connecting member is annealed in a short time. be able to.

Further, according to the method of manufacturing a stretched mask according to the present invention, a step of forming a frame including a pair of support rods and a pair of elastic supports, and a plurality of grid elements are provided in parallel. Forming the aperture grille structure, fixing the aperture grille structure to the support rods while pressing the frame so that the two support rods approach each other, and fixing the aperture grille structure to the support rods, Releasing the pressure, connecting the pair of support rods with a connecting member having a smaller coefficient of thermal expansion than the coefficient of thermal expansion of the aperture grille structure, the step of attaching the connecting member to the support rods the aperture grille structure. Separated from the process of fixing to the support rod, the manufacturing process of the spreading mask can be simplified, and the connecting member can be attached with high accuracy.

Further, according to the method for manufacturing a stretched mask according to the present invention, a step of forming a frame including a pair of support rods and a pair of elastic supports, and a number of grid elements are provided in parallel. A step of forming an aperture grille structure, and fixing the aperture grille structure to the support rods in a state where the frame is pressed so that the two support rods approach each other, and the distance between the pair of support rods is determined by the coefficient of thermal expansion of the aperture grille structure. And a step of releasing the pressurization of the frame to which the aperture grille structure and the connecting member are attached, so that tension is also applied to the connecting member. This makes it possible to concentrate the tension on the connecting member at a low temperature during the high-temperature treatment, thereby increasing the effect of suppressing the creep of the grid body during the high-temperature treatment. It is possible.

[Brief description of the drawings]

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

FIG. 2 is a graph showing measured tensions of a grid element at an end and a center of an aperture grille structure before and after a high-temperature treatment.

FIG. 3 is a partially cutaway view illustrating a method for manufacturing an extended mask type color cathode ray tube according to Embodiment 3 of the present invention.

FIG. 4 is a schematic cross-sectional view showing an expansion mask type color cathode ray tube.

FIG. 5 is a perspective view showing an expansion mask of a conventional expansion mask type color cathode ray tube.

[Explanation of symbols]

1 tube, 8 spreading mask, 9, 10 support rod, 11, 12 elastic support, 13 frame,
14 grid body, 15 aperture grille structure,
16 metal plate (connecting member), 17 high frequency coil,
18 Low resistance metal plate (low resistance member).

Claims (8)

[Claims] 1. A pair of support rods which are opposed to each other at a predetermined interval, and a pair of elastic supports which are attached at a predetermined interval between the support rods and bias the support rods away from each other. A plurality of grid elements in a direction intersecting the two support rods are provided in parallel, an aperture grille structure supported by being stretched between the two support rods, and smaller than a thermal expansion coefficient of the aperture grille structure. An expansion mask type color cathode ray tube having an expansion mask having a thermal expansion coefficient and having a connecting member for connecting the pair of support rods in a length direction of the grid element body. 2. A connecting member comprising a pair of connecting members for connecting both ends of a pair of supporting rods.
The described expanded mask type color cathode ray tube. 3. An extended mask type color cathode ray tube according to claim 1, wherein no tension is applied to the connecting member. 4. The connecting member is made of a metal plate and has a thickness of 0.1 mm.
The expanded mask type color cathode ray tube according to claim 1 or 2, wherein the expanded mask type cathode ray tube has a composition of an Fe-Ni-based alloy having a width of from 0.05 mm to 0.8 mm and a width of from 2 mm to 30 mm. 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 support bars and bias the support bars away from each other. A plurality of grid elements in a direction intersecting the two support rods are provided in parallel, an aperture grille structure supported by being stretched between the two support rods, and smaller than a thermal expansion coefficient of the aperture grille structure. A step of mounting a spreading mask having a coefficient of thermal expansion and having a connecting member for connecting the pair of support rods in the length direction of the grid element body to the inside of the color cathode ray tube; and A step of subjecting the color cathode ray tube to a high temperature treatment; and, after this high temperature treatment step, a step of heating the connection member to remove the tension of the connection member. Construction method. 6. The expansion according to claim 5, wherein the heat treatment of the connecting member is high-frequency heating, and a low-resistance member having an electric resistance lower than that of the connecting member is superposed on the connecting member. A method for manufacturing a mask type color cathode ray tube. 7. A pair of support rods 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 rods and bias the two support rods away from each other. A step of forming a frame consisting of, and a step of forming an aperture grille structure in which a number of grid elements are provided in parallel, and the above-mentioned state in which the frame is pressed so that the two support rods approach each other. Fixing the aperture grille structure to the support rod, releasing the pressurization of the frame after fixing the aperture grille structure to the support rod, and moving the thermal expansion coefficient of the aperture grille structure between the pair of support rods. A method for manufacturing an expansion mask, comprising a step of connecting with a connecting member having a smaller thermal expansion coefficient. 8. A pair of support rods which are opposed to each other at a predetermined interval, and a pair of elastic supports which are attached at a predetermined interval between the two support rods and bias the two support rods away from each other. A step of forming a frame consisting of, and a step of forming an aperture grille structure in which a number of grid elements are provided in parallel, and the above-mentioned state in which the frame is pressed so that the two support rods approach each other. Fixing the aperture grille structure to the support rod, connecting the pair of support rods with a connection member having a thermal expansion coefficient smaller than the thermal expansion coefficient of the aperture grille structure, and connecting the aperture grille structure to the aperture grille structure A method for manufacturing a stretching mask, comprising a step of releasing pressure of the frame to which the member is attached.