JPH10125249A - Color selection electrode device of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color selection electrode device of a cathode-ray tube which can prevent the occurrence of welding wrinkles due to improper rigid balance of a structure element. SOLUTION: A square thin plate-shaped electrode element body 2 constituting an aperture grill is supported by a frame structure comprising a pair of first structure elements 4A and 4B and a pair of second structure elements. The first structure elements 4A and 4B are welded along both side edges of the electrode element body 2. The second structure elements 6A and 6B perpendicular to the first stricture elements 4A and 4B are welded in such a manner as to establish connection between the ends of the first structure elements 4A and 4B. In the case in which the second structure elements 6A and 6B are solid, the following inequality 0.5<=IA/IB1.0 is satisfied, if it is assumed that IA represents the moment of inertia of area in the first structure elements 4A and 4B, and IB represents the moment of inertia of area in the second structure elements 6A and 6B. If the second structure elements 6A and 6B are hollow, the following inequality 0.9<=IA/IB<=0.5 is satisfied, and thereby the occurrence of welding wrinkles is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection electrode device for a cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, as a color selecting electrode device used for a trinitron type cathode ray tube, for example, as shown in FIG. 1, an electrode element body 2 constituting an aperture grill is supported by a frame structure as shown in the figure. Things are known. The electrode body 2 is formed in a rectangular thin plate shape,
It has a color selection opening of 00 μm width and a width element of 150 to 560 μm.

[0003] The frame structure has a pair of first structural elements 4A and 4B which are welded along both sides of the electrode body 2 and is orthogonal to the first structural elements 4A and 4B. A pair of second structural elements 6 parallel to each other, which are welded so as to connect between respective ends of the first structural elements 4A, 4B.
A, 6B. Electrode body 2, first structural element 4
A, 4B and the second structural elements 6A, 6B are each formed of an iron-based metal, and are joined to each other by welding.

The first structural elements 4A and 4B are composed of a vertical portion 4a protruding toward the electrode element body 2 and a first end connected to the vertical portion 4a at the base end. It is formed in an L-shaped cross section having a lateral portion 4b protruding in the opposite direction. The second structural elements 6A and 6B have a rectangular cross section in the illustrated example, and approximately 9
A bent portion 6b bent at 0 degrees is provided, and each bent portion 6b is welded to the lateral portion 4b of the first structural element 4A, 4B. In the structure example shown in FIG. 1, the second structural element 6
Although the straight portions 6a and the bent portions 6b of A and 6B are formed in a single plane, as shown in FIG. 2, the bent portions 6b of the second structural elements 6A and 6B are the first structural elements. 4A, 4B
Some have a shape curved in the longitudinal direction.

Further, in such a color selection electrode device, in order to secure the vibration resistance of the electrode element 2, 10 to 7
It is necessary to assemble with a tensile stress of 5 kg / mm ² applied. Therefore, when manufacturing this color selection electrode device, as shown in FIG.
The electrode body 2 is welded in a state in which a compressive force F of 1000 kg or more is applied in the approaching direction of B. After the compression force of the first structural elements 4A and 4B is released, the first structural elements 4A and 4B are formed by removing the peripheral portion of the electrode element body 2, and the process proceeds to a subsequent heat treatment step or the like.

[0006]

However, in the above prior art, if the rigidity balance between the first structural elements 4A and 4B and the second structural elements 6A and 6B is inappropriate,
After welding of the electrode body 2 or after the heat treatment performed thereafter,
As shown in FIG. 12, the following inconveniences have been caused by the occurrence of a portion of non-uniform curvature on the surface of the electrode body called a so-called welding wrinkle 8.

[0007] (1) The shape of the opening of the electrode element varies, causing the subsequent stripe-like carbon and phosphor width to be disturbed, thereby deteriorating the image quality of the cathode ray tube. (2) In order to suppress the vibration generated in the vertically striped electrode element, the fine element wires 10A, 10A, 10B for damping as shown in FIG.
B is brought into contact with the surface of the electrode body and welded. However, as shown in FIG.
The vibration damping property of this portion is significantly deteriorated, and the image quality is reduced. Accordingly, an object of the present invention is to provide a color selection electrode device for a cathode ray tube, which can prevent the occurrence of welding wrinkles due to improper rigidity balance of structural elements.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an electrode element formed in a rectangular thin plate shape and a pair of parallel electrodes welded along both side edges of the electrode element. A first structural element, orthogonal to each of the first structural elements,
A color selection electrode device for a cathode ray tube, comprising a pair of mutually parallel second structural elements welded so as to connect between respective ends of each first structural element. And a predetermined second moment of area ratio.

In the color selecting electrode device for a cathode ray tube according to the present invention, the first structural element and the second structural element have a predetermined cross section 2.
Since it is formed with the next moment ratio, when each structural element is welded in a state where a compressive load is applied, each structural element will be held in an optimal balance, effectively preventing the occurrence of wrinkles Can be suppressed. For this reason, when the fine element wire for damping the electrode element is welded to the surface of the electrode element, the non-contact portion can be eliminated, and the vibration resistance of the electrode element can be improved.
Further, it is possible to stably apply the tension for improving the vibration resistance of the electrode body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a color selection electrode device for a cathode ray tube according to the present invention will be described. FIG.
1 is an exploded perspective view showing an example of a color selection electrode device for a cathode ray tube according to the present invention. The electrode element body 2 is formed in a rectangular thin plate shape, and has a color selection opening having a width of 40 to 200 μm and 150 to 5 μm.
It has a width element of 60 μm.

The frame structure has a pair of first structural elements 4A and 4B which are welded along both sides of the electrode element body 2 and are orthogonal to the first structural elements 4A and 4B. A pair of second structural elements 6 parallel to each other, which are welded so as to connect between respective ends of the first structural elements 4A, 4B.
A, 6B. Electrode body 2, first structural element 4
A, 4B and the second structural elements 6A, 6B are each formed of an iron-based metal, and are joined to each other by welding.

The first structural elements 4A and 4B are composed of a vertical part 4a protruding toward the electrode element body 2 and a first end connected to the vertical part 4a at the base end. It is formed in an L-shaped cross section having a lateral portion 4b protruding in the opposite direction. The second structural elements 6A and 6B have a rectangular cross section in the illustrated example, and approximately 9
A bent portion 6b bent at 0 degrees is provided, and each bent portion 6b is welded to the lateral portion 4b of the first structural element 4A, 4B.

In the structural example shown in FIG. 1, the straight portions 6a and the bent portions 6b of the second structural elements 6A and 6B are formed in a single plane. However, as shown in FIG. The bent portion 6b of the second structural element 6A, 6B is connected to the first structural element 4
A and 4B have a shape curved in the longitudinal direction. In the following description, what is shown in FIG.
The structure shown in FIG. 2 is called a type II frame structure.

Further, in such a color selection electrode device, the electrode element 2 is provided with 10 to 7 in order to secure the vibration resistance of the electrode element 2.
It is necessary to assemble with a tensile stress of 5 kg / mm ² applied. Therefore, when manufacturing this color selection electrode device, as shown in FIG.
The electrode body 2 is welded in a state in which a compressive force F of 1000 kg or more is applied in the approaching direction of B. After the compression force of the first structural elements 4A and 4B is released, the first structural elements 4A and 4B are formed by removing the peripheral portion of the electrode element body 2, and the process proceeds to a subsequent heat treatment step or the like.

In the above configuration, the first structural elements 4A and 4B and the second structural elements 6A and 6B are formed with a predetermined second moment of area ratio. FIG. 4 shows the first structural element 4A, 4B and the second structural element 6
It is explanatory drawing which shows the calculation method of the area moment of area with respect to A and 6B. As described above, the electrode element 2 and the structural element 4
When welding the frames A, 4B, 6A, and 6B with a frame, a compressive load F as shown in FIG. 4A is applied.

First, regarding the first structural elements 4A and 4B, assuming a bending notch M1 as shown in FIG. 4 (2), with respect to the neutral plane in the direction indicated by a dashed line α with respect to the L-shaped section. To calculate the second moment of area. Further, regarding the second structural elements 6A and 6B, assuming a bending notch M2 as shown in FIG. Calculate the moment. As the shape of the second structural elements 6A and 6B, for example, as shown in FIGS. 5A to 5D, the second structural elements 6A and 6B have a round bar shape having a solid circular cross section or a solid rectangular cross section. There is a square rod shape, a round tube shape having a hollow circular cross section, and a square tube shape having a hollow rectangular cross section, but the direction of the neutral plane is common.

Next, the first structural element 4 employed in this embodiment
The ratio of the moment of inertia of area between A, 4B and the second structural elements 6A, 6B will be described. The first structural element 4A, the second moment of 4B and I _A, the second structural element 6A, 6B
Explaining the second moment as I _B. First, FIG. 8 is an explanatory diagram for explaining a manner of deformation that occurs when the I _A << I _B in the I-shaped frame structure, Figure 9, II
Is an explanatory view for explaining how to deformation which occurs when the I _A << I _B in the mold frame structure. As shown, I _A
<< in the case of I _B, the first structural element 4A, 4B deformation increases the deformation of the second structural element 6A, 6B. Therefore, in particular, each of the structural elements 4A, 4B, 6A, 6
Weld wrinkles 8 are likely to occur due to distortion near the inflection points of the welded portion B and the first structural elements 4A, 4B.

Next, FIG 10 is an explanatory diagram for explaining a manner of deformation that occurs when the I _A >> I _B in the I-shaped frame structure, Fig. 11, I in II-shaped frame structure _A
>> it is an explanatory view illustrating a modification of the manner that occurs in the case of I _B. As shown, I _A >> In the case of I _B, the second structural element 6A, 6B deformation of the first structural element 4A, 4B
Larger for the deformation of Accordingly, welding wrinkles 8 are likely to occur particularly due to distortion in the welded portions of the respective structural elements 4A, 4B, 6A, 6B.

FIGS. 6 and 7 show the first structural element 4.
FIGS. 6A and 6B are explanatory diagrams showing the results of investigating the occurrence of welding wrinkles in the electrode element body 2 with respect to the ratio of the second moment of area of the second structural element 6A to the second structural elements 6A and 6B. , 6B are formed as solid round bars or square bars, and FIG. 7 shows the case where the second structural elements 6A, 6B are formed as hollow round tubes or square tubes. ing. Here, the first structural element 4A, the second moment of 4B and I _A, when the second structural element 6A, the second moment of 6B was I _B, welding wrinkles for I _A / I _B We are investigating the occurrence situation of 8 The above-mentioned compression load F is a case where 1000 kg is applied.

First, when the second structural elements 6A and 6B are formed as solid round bars or square bars, as shown in FIG. 6, when I _A / I _B <0.5, First structural element 4
Since the deformation of A, 4B is larger than the deformation of the second structural elements 6A, 6B, as described above, each of the structural elements 4A,
4B, 6A, 6B welds and first structural elements 4A, 4B
, Welding wrinkles are likely to occur due to distortion near the inflection point. Further, the I _A / I _B> 1.0, as described above, each structural element 4A, 4B, 6A, for distortion of the weld 6B is large, the welding wrinkle is easily generated also in this portion. As a result, when the second structural element 6A, 6B is constituted by a solid round bar or square bar _{of, 0.5 ≦ I A / I B} ≦ 1.
It can be seen that the effect of suppressing wrinkles is large in the range of 0.

Next, when the second structural elements 6A and 6B are formed in a hollow round tube or square tube, as shown in FIG. 7, when I _A / I _B <0.9. In addition, since the deformation of the first structural elements 4A and 4B is larger than the deformation of the second structural elements 6A and 6B, as described above,
A, 4B, 6A, 6B welds and first structural elements 4A,
Welding wrinkles are likely to occur due to distortion near the inflection point of 4B. Further, the I _A / I _B> 1.5, as described above,
Since the distortion of the welded portion of each of the structural elements 4A, 4B, 6A, 6B is large, wrinkles are likely to occur at this portion as well. As a result, when the second structural element 6A, 6B are round shaped tubes or square shaped tube _{hollow, 0.9 ≦ I A / I B} ≦
It can be seen that the effect of suppressing wrinkles is large in the range of 1.5.

Accordingly, the second moment of area I _{A of} the first structural elements 4A, 4B and the second structural elements 6A, 6B is obtained.
/ A I _B, the second structural element 6A, in accordance with the cross sectional shape of _{6B, 0.5 ≦ I A / I} B ≦ 1.0 or 0.9 ≦ I _A /
By setting the range of I _B ≦ 1.5, and effectively suppress the welding wrinkles of the electrode matrix 2, welding thin-shaped wires 10A for damping of the electrode body 2, and 10B to the electrode-containing body surface In this case, the non-contact portion 12 can be eliminated, and the vibration resistance of the electrode element body 2 can be improved. In addition, it is possible to stably apply the tension for improving the vibration resistance of the electrode element body 2.

[0023]

As described above, according to the present invention, the first structural element and the second structural element constituting the frame structure for supporting the electrode element are formed by changing the ratio of the second moment of area instead of the rigidity ratio. It was formed based on. For this reason, when each structural element is welded in a state where a compressive load is applied, each structural element is held in an optimal balance, and generation of welding wrinkles can be effectively suppressed.

Therefore, when the fine element wire for damping the electrode element is welded to the surface of the electrode element, the non-contact portion can be eliminated, and the vibration resistance of the electrode element can be improved. Further, it is possible to stably apply the tension for improving the vibration resistance of the electrode body. As described above, the image quality of the cathode ray tube can be improved.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view showing another example of a color selection electrode device for a cathode ray tube according to the present invention.

FIG. 3 is an exploded perspective view showing a manufacturing process of the color selection electrode device shown in FIG.

FIG. 4 is an explanatory diagram showing a method of calculating a second moment of area for each structural element of the color selection electrode device shown in FIG. 1;

FIG. 5 is a cross-sectional view showing a list of cross-sectional shapes of a second structural element of the color selection electrode device.

FIG. 6 is an explanatory diagram showing an example of a result of investigating a state of occurrence of welding wrinkles of the electrode element body with respect to a second moment of area ratio of each structural element.

FIG. 7 is an explanatory view showing another example of the result of investigating the occurrence of welding wrinkles in the electrode element body with respect to the ratio of the second moment of area of each structural element.

FIG. 8 is an explanatory diagram for explaining how to deform each structural element with respect to the ratio of the second moment of area of each structural element.

FIG. 9 is an explanatory diagram for explaining a method of deforming each structural element with respect to a second moment of area ratio of each structural element.

FIG. 10 is an explanatory diagram for explaining a method of deforming each structural element with respect to the ratio of the second moment of area of each structural element.

FIG. 11 is an explanatory diagram for explaining how to deform each structural element with respect to the ratio of the second moment of area of each structural element.

FIG. 12 is a front view showing wrinkles generated on an electrode body of the color selection electrode device.

FIG. 13 is a front view showing a state in which a fine element wire for vibration suppression is welded to the electrode body of the color selection electrode device.

FIG. 14 is an explanatory diagram showing a non-contact portion generated between the electrode element body and the fine element wire shown in FIG.

[Description of Signs] 2... Electrode body, 4A, 4B... First structural element, 4a
... vertical part, 4b ... horizontal part, 6A, 6B ... second structural element, 6a ... linear part, 6b ... bent part, ... welding wrinkle.

Claims (5)

[Claims] 1. An electrode element formed in a rectangular thin plate shape, a pair of first structural elements parallel to each other welded along both sides of the electrode element, and each of the first structural elements And a pair of second structural elements parallel to each other and welded so as to connect between respective ends of the first structural elements. The element and the second structural element in a predetermined cross section 2
A color selection electrode device for a cathode ray tube, characterized by having a second moment ratio. 2. The second structural element is formed in a rod shape having a circular or square cross section, and a second moment of area ratio between the first structural element and the second structural element is 0.5 to 1. 0
2. The color selection electrode device for a cathode ray tube according to claim 1, wherein the color selection electrode device is set in the range of: 3. The second structural element is formed in a tubular shape having a circular or square cross section, and has a second moment of area ratio between the first structural element and the second structural element of 0.9 to 1.0. 5
2. The color selection electrode device for a cathode ray tube according to claim 1, wherein the color selection electrode device is set in the range of: 4. The first structural element includes a vertical portion protruding toward the electrode element body and welded to the electrode element, and a first structural element connected to the vertical section at a base end and connected to each other. The second structural element has bent portions at both ends of a straight portion, and each bent portion is formed with a horizontal portion protruding in opposite directions, and each bent portion is formed by a horizontal portion of the first structural element. 2. The color selection electrode device for a cathode ray tube according to claim 1, wherein the electrode is welded to the electrode. 5. The cathode ray tube according to claim 1, wherein each of the first structural elements is welded to the electrode element in a state in which pressure is applied in a direction approaching each other. Color sorting electrode device.