JPH04280044A - Color selecting electrode device for color cathode-ray tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the vibration resistance and provide a high-precision screen by using a spring material for the frame of a color selecting electrode device, and locating the sides of the frame nearly in one plane. CONSTITUTION:Frame bodies 21a, 21b faced to each other are made of a spring material and have a U-shaped cross section. Support sides 22a, 22b made of a spring material are provided on the frame bodies 21a, 21b. The frame of a color selecting electrode device 7 is constituted of the frame bodies 21a, 21b and the support sides 22a, 22b, the sides of the frame are located nearly in one plane, and many color selecting electrodes 11 made of a metal fine stripe are stretched and arranged on the front faces of the frame bodies 21a, 21b. The frame of the color selecting electrode device 7 is made of a spring material, the sides of the frame are located nearly in one plane, a load is applied to the long side section of the frame at three or more pressure points, the color selecting electrodes 11 are deposited and fixed, then the load is removed, thus the tension with uniform distribution can be applied to the color selecting electrodes 11, and the resonance of the color selecting electrodes 11 caused by the vibration from the outside can be suppressed.

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 a color selection electrode device and a method for manufacturing the same.

0002

[Prior Art] Generally, in color cathode ray tubes, FIG.
As shown in FIG. 2, a panel portion 3 is frit-welded to the open end of a funnel portion 2 having a neck portion 1, thereby forming a tube 4. A fluorescent screen 6 is formed on the inner surface of the face plate 5 of the panel section 3, and a color selection electrode device 7 is installed opposite to the fluorescent screen 6. Electron beams 9 corresponding to each color, for example, red, green, and blue, emitted from an electron gun 8 installed in the neck portion 1 are regulated in their arrival positions by a color selection electrode device 7, and are directed to the corresponding colors on the phosphor screen 6. landing on the phosphor.

FIG. 7 is a perspective view showing a conventional color selection electrode device 7. In the figure, 10a and 10b are a pair of opposing frame sides, and 10c and 10d are a pair of frame sides 10a, 10d.
These are the left and right arm portions provided across the space 10b. Color selection electrodes 11 made up of a large number of strip elements are arranged in a stretched manner on the front end surfaces of opposing frame sides 10a and 10b. Furthermore, several damper wires 12 as vibration damping materials are provided so as to intersect with the color selection electrodes 11.

In manufacturing the conventional color selection electrode device 7, first, a pair of arm portions 1 made of an elastic material are placed at or near the Bessel points of a pair of opposing frame sides 10a and 10b.
Weld 0c and 10d. Then, as shown in FIG. 8, a load is applied by two-point support at the welding point between the opposing frame sides 10a and 10b or at a predetermined point in the vicinity, and a predetermined deflection is achieved within the elastic range of the pair of arms 10c and 10d. The space between the supporting points is compressed until The figure indicated by the dashed line in FIG. 9 is the figure before compression, and the figure indicated by the solid line is the figure after compression. When pressurized at , the frame sides are compressed parallel to each other. As shown in FIG. 8, in this state, a color selection electrode 11 consisting of a large number of metal strip elements is stretched between 10a and 10b and fixed by welding. Then frame side 1
When the load between the support points applied between 0a and 10b is removed, the compressed space between 10a and 10b is restored by the restoring force of the arms 10c and 10d made of elastic bodies, and the stretched color selection Tension is applied to the electrode 11. Then, several damper wires 12 as a damping material are passed across the color selection electrode 11, and the arm portions 10c and 10d are
The color selection electrode device 7 is manufactured by spot welding.

[0005]

[Problems to be Solved by the Invention] The conventional color selection electrode device is constructed as described above, and the strip element body serving as the color selection electrode resonates due to vibrations applied from the outside, causing the screen to shake. In order to prevent this, it is important to apply a necessary tension to the strip element, and in order to apply this tension, the frame structure becomes complicated, and the shape and weight become large. In addition, since the load is applied at two points near both ends of the long side of the frame, it is difficult to obtain the required tension uniformly over the entire surface. The tension distribution is as shown in Fig. 10. Therefore, it is necessary to stretch a damper wire as a vibration damping member for the color selection electrode, which is a strip element whose tension is less than the required tension, and its line shadow is was projected onto the screen when the cathode ray tube was operating, making it difficult to obtain fine image quality.

The present invention was made to solve the above-mentioned problems, and it is possible to obtain the required tension distribution in the color selection electrode made of strip elements and to keep the damping time constant short. The purpose of the present invention is to obtain a color selection electrode device for a color cathode ray tube that is simpler, more compact, and lighter in weight while also being able to suppress resonance caused by external vibrations and having the required rigidity, and a method for manufacturing the same. do.

[0007]

[Means for Solving the Problems] In the color selection electrode device for a color cathode ray tube and the manufacturing method thereof according to the present invention, the frame of the color selection electrode device is constructed of a spring material, and the frame is hung on the long side of the frame during manufacturing. The load is distributed so that the load is greater in the center than at both ends of the long side.
A color selection electrode made of a strip element is passed over the frame and fixed by welding, and then the load is removed. Also, part or all of the frame has a U-shaped cross section.

[0008]

[Operation] In this invention, a spring material is used for the frame of the color selection electrode device, and the distribution of the load applied to the long side of the frame during manufacturing is adjusted so that the amount of restoration, that is, the amount of deflection compressed by the load, is The frame is compressed so that the center part is larger than each end part, and in this state, a color selection electrode is stretched between the long sides of the frame and fixed by welding, and then between the long sides of the frame. Since the applied load was removed, the deflection that had been compressed due to the restoring force of the frame was restored, and the desired distribution of tension was applied to the color selection electrodes that had been stretched and welded. Therefore, resonance of the color selection electrode caused by external vibration can be suppressed. Furthermore, since part or all of the frame has a U-shaped cross section, rigidity can be increased.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a color selection electrode device for a color cathode ray tube according to an embodiment of the present invention. In the figure, 21
Reference numerals a and 21b indicate opposing frames, which are made of spring material and have a U-shaped cross section. Support sides 22a and 22b are provided across the frames 21a and 21b, and are made of spring material. Opposing frames 21a, 21
Color-selecting electrodes 11 made up of a large number of strip elements (metal strips) are strung and arranged on the front side surface of b.

Next, the color selection electrode device 7 in this embodiment
The manufacturing method will be explained. The frame of the color selection electrode device 7 is composed of frame bodies 21a, 21b made of spring material and supporting sides 22a, 22b. Compression is performed by applying a distributed load at at least three pressurizing points, as shown in FIG. 2, so that the distance between the frame bodies is smaller than the distance between the frame bodies at each end. The figure indicated by the dashed line in FIG. 3 is the figure before compression, and the figure indicated by the solid line is the figure after compression. As shown in FIG. 3, the long side of the frame By bending the central part of the frame, the long and short sides of the frame, each made of a spring material, are compressed to a predetermined deflection within the elastic range. In this state, a color selection electrode 11 consisting of a large number of strip elements is stretched on the long sides of the opposing frames 21a and 21b.
Weld and fix.

After that, when the load applied between the long sides of the frame is removed, the compressed long sides are restored due to the restoring force of the long and short sides of the frame made of spring material, and the frame is restored. The color selection electrode 11 is manufactured so that a tension with a desired distribution is applied to the color selection electrode 11 which is stretched and fixed by welding.

In order to suppress the resonance of the color selection electrode 11 caused by external vibration without stretching the damper wire for vibration suppression, it is necessary to increase the tension above a certain level, and to do this, it is necessary to increase the tension of the frame to a certain level. It is necessary to increase the rigidity. On the other hand, if you want to make the frame lightweight and compact, you cannot increase the rigidity very much. Therefore, the best method is to uniformly apply the minimum necessary tension, but in this regard, Figure 4
shows the tension distribution of the color selection electrode 11 of the above embodiment, and it can be seen from the figure that the required uniform distribution of tension is obtained.

As described above, according to this embodiment, the frame of the color selection electrode device 7 is made of spring material, and the long sides of the frame are
The color selection electrode 11 is welded and fixed by applying a load at three or more pressurizing points so that the amount of restoration at the center is large, and then the load is removed. Since the necessary tension with a uniform distribution can be obtained in the sorting electrode 11, resonance of the color sorting electrode caused by external vibration can be suppressed, the need for a Danher wire can be omitted, and the color sorting electrode device 7 It is possible to reduce the size and weight of the device.

Furthermore, by making the frames 21a and 21b U-shaped in cross section, the rigidity can be increased, so that the weight can be further reduced while maintaining the required rigidity.

In the above embodiment, the frame consists of the frame bodies 21a, 21b and the supporting sides 22a, 22 connecting them.
b, but as shown in FIGS. 5(a) and 5(b), the frame may be integrally molded, and the short side portion 24
Depending on the required pressing force, the elasticity (restoring force) may be variously deformed into a shape such that a notch 25 is made to adjust the elasticity. Further, in order to optimize the elasticity (restoring force), the materials for the long side portions 23 and the short side portions 24 of the frame may be selected to have different elastic coefficients.

Further, the electrode surface of the frame of the color selection electrode device 7 may be modified such as by being bent to match the curved surface of the face plate 5.

[0017]

As described above, according to the color selection electrode device for a color cathode ray tube according to the present invention, in the frame of the color selection electrode device made of a spring material, the amount of restoration in the center part is smaller than that in both ends of the long side part. By applying a load with the required distribution so that the color selection electrode is large and then removing the load after welding and fixing the color selection electrode, it is easy to apply tension with the required distribution to the color selection electrode, improving vibration resistance. This has the effect of making it possible to obtain a high-definition screen, and also makes it possible to make the device smaller and lighter, thereby reducing manufacturing costs. Further, since part or all of the frame has a U-shaped cross section, the rigidity of the frame can be increased and the weight can be further reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a color selection electrode device for a color cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a diagram showing a method of loading a color selection electrode device of a color cathode ray tube according to an embodiment of the present invention.

FIG. 3 is a diagram showing deformation under load of a color selection electrode device of a color cathode ray tube according to an embodiment of the present invention.

FIG. 4 is a diagram showing the tension of the color selection electrode of the color selection electrode device of the color cathode ray tube according to an embodiment of the present invention.

FIG. 5 is a perspective view of a frame of a color selection electrode device for a color cathode ray tube according to another embodiment of the present invention.

FIG. 6 is a configuration diagram of a color cathode ray tube.

FIG. 7 is a perspective view of a color selection electrode device of a conventional color cathode ray tube.

FIG. 8 is a diagram showing a method of loading a color selection electrode device of a conventional color cathode ray tube.

FIG. 9 is a diagram showing deformation under load of a color selection electrode device of a conventional color cathode ray tube.

FIG. 10 is a diagram showing the tension of a color selection electrode of a color selection electrode device of a conventional color cathode ray tube.

[Explanation of symbols]

7 Color selection electrode device 11
Color selection electrodes 21a, 21b
Frame bodies 22a, 22b Supporting side 23 Long side part 24 Short side part

Claims (3)

[Claims] Claim 1. A color selection electrode device comprising a frame and a color selection electrode provided across the frame,
A color selection electrode device for a color cathode ray tube, characterized in that the frame is made of a spring material, and the color selection electrode is stretched under tension by the restoring force of the frame. 2. The color selection electrode device for a color cathode ray tube according to claim 1, wherein part or all of the frame has a U-shaped cross section. 3. The method for manufacturing a color selection electrode device for a color cathode ray tube according to claim 1, wherein the amount of restoration at the center of the long side of the frame of the color selection electrode device is equal to the amount at both ends of the long side of the frame. A color selection electrode for a color cathode ray tube, characterized in that the color selection electrode is bent by applying a load so as to be larger than the restoration amount of the frame, the color selection electrode is welded and fixed to the frame, and then the load is removed to restore the frame. Method of manufacturing the device.