JPH06283095A - Assembly method for color selecting mechanism for cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide proper tension distribution in a grid body structure, and enable stress concentration to be alleviated at a pressing point. CONSTITUTION:A color selecting grid structure body having a plurality of strip type grid elements arrayed at the prescribed pitch and beam transmission holes formed among the grid elements, is laid in such a condition as pressing the side 1A of a frame 1. A pressing means 2A is constituted of U-shaped arm members 7 to 9 jointed via equalizing mechanisms 10a to 10c. When the pressing means 2A is used and the frame 1 is divided into four quadrants, depending upon tension applicable to the grid body structure, pressure is applied from three points 12 to 14 per quadrant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a color selecting mechanism for a cathode ray tube which is suitable for use in, for example, a color picture tube.

[0002]

2. Description of the Related Art Conventionally, as a color selecting mechanism for a color cathode ray tube, there has been known one in which a grid structure made of a thin metal plate having a large number of slits (beam transmitting holes) is installed on a metal frame. In recent years, such a color selection mechanism is required to be large in size, high in definition (fragmentation of slit pitch) and light in weight by thinning the grid structure. For that purpose, a frame which is a support base during assembly is required. On the other hand, it is necessary to be able to press with an accurately set pressurizing amount.

This is for setting an appropriate gradient in the tension distribution of the grid structure of the color selection mechanism, especially the grid element body. In addition, even when the grid structure is welded to the upper part of the pressurized frame and then the pressure is released and the grid structure is stretched, the dimensional accuracy as the color selection mechanism is required to be guaranteed.

Therefore, conventionally, for example, as shown in FIG. 5, when the frame 31 is divided into four quadrants, a pair of adders with an equalizer 13 having two pressers 32a and 32b per quadrant are provided. Using the pressure means 34 (34A, 34B), the side portion 31A of the frame 31 is pressed in one direction (± Y direction) and compressed. In this case, there are eight pressurizing points on both sides, one pressurizing means 34B is fixed (the equalizer 32 operates), and the other pressurizing means 34A is driven by, for example, driving a cylinder.

[0005]

By the way, when the frame 31 of the color selecting mechanism is pressed by such a method, in order to prevent the grid structure 35 (particularly the grid element 35a) from swinging, the central part of the grid structure 35 is prevented. It is necessary to increase the tension from to both ends. Further, since the total load applied to the frame 31 is increasing with the increase in size of the color selection mechanism, it is also required to disperse the stress concentration per one pressurizing point. The reason is that when the stress concentration exceeds a certain value, wrinkles occur in the grid structure 35 near the pressure point. However, in the conventional example having the above-described configuration, since pressure is applied at two pressure points per quadrant, it becomes difficult to apply tension with appropriate distribution to the grid structure 35 as the color selection mechanism becomes larger. Came. Further, in the configuration of the conventional example, since the load per pressurizer 32 becomes large, stress concentration occurs in the pressurizing portion, and there is a problem that wrinkles occur in the grid structure 35. Further, in the pressurizing method by the conventional two-point, as shown in FIG. 6A, the pressure point X _32a, since the tension in the vicinity of the X _{32 b} is increased, these pressure points X _32a, between the X _{32 b} There is a region where the increment of tension is small (the slope is small).
On the other hand, as shown in FIG. 6B, the resonance frequency of the grid element with respect to external vibrations such as voice and vibration shows a distribution similar to the above tension, and for example, the frequency range is f _{1 to} f.
_When an external vibration of ₂ (Hz) is applied, X ₁₀ to
In the range of X ₂₀ , the grid element body 35a sways, and particularly when it sways, it stands out on the screen.
This may impair the image quality of the cathode ray tube. As described above, according to the conventional method, the grid element body 35a oscillates over a wide range in a portion where the tension increment between the pressure points X _32a and X _32b is small, and in the case of a large pipe, the portion where the tension increment is small covers a wide area. Therefore, the deterioration of the image quality in a wide range due to the swing of the grid element body 35a has been a problem.

The present invention has been made in view of the above points of the conventional example, and an object of the present invention is to obtain an appropriate tension distribution in the grid structure, to alleviate the stress concentration at the pressurizing point, and to further improve the grid element. An object of the present invention is to provide a method of assembling a color selection mechanism that can prevent deterioration of image quality due to body shake.

[0007]

The present invention is described in, for example, FIG.
As shown in FIG. 4, a grid structure 6 for color selection is formed by arranging a plurality of strip-shaped grid elements 5a with a predetermined pitch and forming beam transmission holes 4 between the grid elements 5a.
In the method of assembling the color selecting mechanism for a cathode ray tube, which includes a step of installing the side portions 1A of the frame 1 on these side portions 1A in a pressurized state, according to the tension distribution to be given to the grid structure 6 described above. When the frame 1 is divided into four quadrants, the pressure is applied at three or more pressurizing points 12 to 14 per quadrant.

In this case, one point out of the pressure points 12 to 14
4 can be arranged in the vicinity of the welding point 1c of the frame 1.

Further, the pressure points 13 and 14 on the end side of the pressure point 12 on the center side of the side portion 1A of the frame 1 relative to the stress.
It is also possible to apply pressure so that the stress at is larger.

Further, it is possible to apply pressure so that the increment of the tension in the grid element body 5a gradually increases from the central portion to the end portion of the side portion 1A of the frame 1.

[0011]

In the case of the present invention having such a structure, since the side portion 1A of the frame 1 is pressed at three or more pressing points 12 to 14 per quadrant, one pressing point 1 is provided as compared with the conventional method.
The force applied to 2 to 14 is reduced, and as a result, local stress concentration on the side portion 1A of the frame 1 is relieved.

Further, compared to the conventional method, the pressure points 12 to 14
Since there are as many as 3 points per quadrant, for example, each pressure point 12 to 1
By changing the pressing force and the position of 4, the tension distribution in the grid structure 6 can be finely changed.

In this case, one point out of the pressure points 12 to 14
4 in the vicinity of the welding point 1c of the frame 1, and
By applying pressure so that the stress at the pressure points 13 and 14 on the end side is greater than the stress at the pressure point 12 on the center side of the side portion 1A of the frame 1, it is possible to obtain an appropriate pressure in the grid structure 6. It becomes easy to obtain the tension distribution.

Further, if pressure is applied so that the increment of the tension in the grid element body 5a gradually increases from the central portion to the end portion of the side portion 1A of the frame 1, the gradient of the tension of the grid element body 5a becomes large, Along with this, the gradient of the resonance frequency distribution also increases, so that the range of swing of the grid element body 5a against external vibration is significantly narrowed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a method for assembling a color selecting mechanism according to the present invention will be described below with reference to FIGS.

FIG. 2 shows the whole of this embodiment.
As shown in the figure, in the present embodiment, a pair of additions are applied to the side surface of the side portion 1A of the frame 1 to which the side portion (support member) 1A and the side portion (U-shaped elastic member) 1B are fixed by welding. The pressure means 2 (2A, 2B) applies pressure from a single direction (± Y direction), and in that state, a large number of grid elements 5a.
A mask (so-called aperture grill) 6 made of a thin metal plate 5 having the slits 4 formed therein is welded. The mask 6 is stretched on the frame 1 by removing the pressure applied to the side portion 1A of the frame 1 after welding.

In this case, one of the pressurizing means 2B is fixed to the fixing means 3 during pressurization. On the other hand, each pressurizing means 2A, 2B has two pressurizing parts, and each pressurizing part is configured symmetrically with respect to the Y axis.

FIG. 1 shows a main part of the pressurizing means 2A. As shown in the figure, in the pressurizing means 2A of this embodiment, a plurality of U-shaped arm members 7, 8 and 9 made of an elastic member such as metal are provided with an equalizing mechanism 10 (10a, 10b and 10c). It is connected through. As shown in FIG. 1B, the equalizing mechanism 10 is a joint mechanism capable of one-dimensional rotational movement around the contact point of the node. That is, with this configuration, the arm members 7 to 9 can swing in the arrow P or Q direction.

In the case of this embodiment, three U-shaped arm members 7 are provided.
~ 9 are three equalizing mechanisms 10a, 10b and 10c
Are connected together to form one pressurizing means 2A.
That is, the first arm member 7 is connected to the piston extension portion 11 of the driving means such as an air cylinder via the equalizing mechanism 10a provided at the center of the support portion 7a. Then, the pressurizer 7b of the first arm member 7 is connected to an equalizing mechanism 10b provided at substantially the center (slightly outside the center) of the support portion 8a of the second arm member 8. One pressurizer 8b of the second arm member 8 is arranged near the end of the side portion 1A of the frame 1, that is, near the welding point 1C of the side portions 1A and 1B of the frame 1, and is in point contact with the side surface of the side portion 1A. To be configured. The other pressurizer 8c is connected to an equalizing mechanism 10c provided at the center of the support portion 9a of the third arm member 9. Further, the pressers 9b and 9c of the third arm member 9 are configured to make point contact with the side surface of the side portion 1A.

When pressurizing using the pressurizing means 2 having such a structure, the driving means (not shown) is operated to press the first arm member 7. This pressing force acts on the side surface of the side portion 1A of the frame 1 via the second and third arm members 8 and 9.

In this embodiment, as shown in FIGS. 1A and 2, when the frame 1 is divided into four quadrants, the side portion 1A of the frame 1 is pressed at three points per quadrant ( Pressure points 12 to 14), so that frame 1 has a total of 1
Pressurized at 2 points. In this case, a more appropriate tension distribution can be obtained by making the pressing force of the pressing points 13 and 14 larger than the pressing force of the pressing point 12.

According to the method of this embodiment, the number of pressure points 12 to 14 is increased to 3 points per quadrant as compared with the conventional method, so that the force applied to one pressure point 12 to 14 is reduced. As a result, local stress concentration on the side portion 1A of the frame 1 is alleviated. As a result, it is possible to prevent the wrinkles of the mask 6 caused by the conventional method.

Further, the positions of the equalizing mechanisms 10a to 10c are changed to change the connection points of the first to third arm members 7 to 9 and the lengths of the respective support portions 7a to 9a of the arm members 7 to 9 are changed. By changing it, the pressing force and position of each pressurizing point 12-14 can be changed, and as a result, the tension distribution in the mask 6 can be made appropriate as shown in FIG. That is, the tension distribution shown by the curve A in the figure can be changed as shown by the curve B or C by changing the applied pressure and the position of each pressurizing point 12-14.

The tension distribution in the mask 6 can be confirmed by applying a resonance frequency distribution with the mask 6 by applying an external vibration capable of changing the frequency to the frame 1 on which the mask 6 is stretched. That is, the following vibration formula

[Equation 1] The tension distribution can be obtained by calculating the tension T from

In this case, the grid element 5a of the mask 6
Increment of tension from the center of side 1A of frame 1
In particular, the curve B in FIG. 3 increases gradually toward the end.
Increase the tension increment (increase the slope of the curve
3) and pressurize it, and as shown in FIG.
The slope of the cloth will also increase. Therefore, a wide frequency range (f
₁~ F₂(Hz)) when external vibration is applied
Also compared to the case of the conventional example shown in FIG.
The range of vibration of the₁-X₂｜ ＜＜ ｜
X_Ten-X₂₀)), As a result, the image quality of the cathode ray tube is poor.
Can be prevented.

Here, in order to gradually increase the increment of the tension of the grid element 5a from the central portion to the end portion of the side portion 1A of the frame 1, for example, in the pressing means 2A of FIG. The tip of the pressurizer 7b of the member 7 is frozen from the center of the support portion 8a of the second arm member 8 to the side portion 1B side of the frame 1 (a> b in the figure), and the second arm member 8 is applied. The tip of the indenter 8c may be connected to the side portion 1B side of the frame 1 from the center of the support portion 9a of the third arm member 9 (in the figure, c
> D). As a result, the force applied to the side portion 1A of the frame 1 at each of the pressurizing points 12 to 14 is F ₁₂ <F ₁₃ <F ₁₄ , so that the increment of the tension of the grid element body 5 a is set to the frame 1
It can be gradually increased from the central portion to the end portion of the side portion 1A.

Further, in the method of this embodiment, since the pressurizing mechanism is not so complicated, the productivity can be stabilized, and no excessive equipment is required.

As described above, according to the method of this embodiment, the mask 6 can be properly attached to a particularly large cathode ray tube (30 inches or more, 72 cm or more).

FIG. 4 shows the essential parts of another embodiment of the present invention. In the following, the parts corresponding to those of the above embodiment are designated by the same reference numerals.

As shown in FIG. 4, in this embodiment,
The pressurizing means 20 for pressurizing the side portion 1A of the frame 1 is composed of four types of arm members 21 to 24. Then, in each quadrant, the side portion 1A of the frame 1 is pressed at 4 points (pressing points 25 to 28), and the frame 1 is pressed at a total of 16 points.

In this case, the tip of the pressurizer 21b of the first arm member 21 connected to the piston extension portion 11 via the joint mechanism 10a, as in the above-described embodiment, has the tip of the second arm via the joint mechanism 10b. It is connected to the support portion 22 a of the member 22. The presser 22 of the second arm member 22
The tips of b and 22c are supporting portions 23a and 24a of the third and fourth arm members 23 and 24 via the joint mechanism 10c.
Respectively connected to.

Further, these third and fourth arm members 2
3, 24 pressers 23b and 23c, 24b and 24c
Of the side of the side portion 1A of the frame 1 are in contact with each other at two points. In this case, for example, as shown in FIG. 4, the tip of the pressurizer 21b of the first arm member 21 is connected to the side portion 1B side of the frame 1 from the center of the support portion 22a of the second arm member 22 (in the figure). , A ≧ b), and also
The tips of the pressers 22b and 22c of the second arm member 22 are set to the third position.
And the fourth arm members 23, 24 are connected to the sides 1B of the frame 1 from the centers of the support portions 23a, 24a (c ≧ d, e ≧ f in the figure). However, the distance between each pressurizer from these connecting positions depends on the size of the frame 1 and the mask 6
It can be changed according to the tension distribution to be applied to. Further, according to the present embodiment, since the number of pressurizing points 25 to 28 is as many as four points per quadrant, more appropriate tension can be applied to the mask 6. Other configurations and operations are the same as those in the above-mentioned embodiment, and therefore their explanations are omitted.

The present invention is not limited to the above-described embodiment, and for example, in addition to changing the position of the pressurizing point as described above, the number of arm members connected by the joint mechanism is increased to increase the number. It is also possible to pressurize the frame at this point.

In the above example, the side portion 1B is provided at the end of the side portion 1A.
Although the frame 1 in which the side 1B is welded is used, it is also applicable to a color selection electrode using a frame in which the side 1B is welded to the vessel point of the side 1A.

[0035]

According to the present invention as described above, since the side portions of the frame are pressed at three or more pressure points per quadrant when the grid structure is installed, the side portions of the frame are pressed. The local stress concentration is alleviated, and as a result, the wrinkling of the grid structure, which is caused by the conventional method, can be prevented.

Further, since there are more pressure points than in the conventional method, an appropriate tension distribution can be obtained in the grid structure.

In this case, one of the pressurizing points should be arranged in the vicinity of the welding point of the frame, and the stress at the pressurizing point on the end side should be less than that at the pressurizing point on the center side of the frame side. By pressurizing the grid structure so that it becomes larger, it is possible to further prevent wrinkles in the grid structure, and it becomes easier to obtain an appropriate tension distribution in the grid structure.

Further, by applying pressure so that the increment of tension in the grid element body gradually increases from the central portion to the end portion of the frame side portion, the range of swing of the grid element body against external vibration is significantly narrowed. As a result, it is possible to prevent deterioration of image quality in the cathode ray tube.

As described above, according to the present invention, it is possible to properly attach the grid structure to a particularly large cathode ray tube.

[Brief description of drawings]

FIG. 1A is an explanatory view showing a main part of an embodiment of an assembling method of a color selecting mechanism for a cathode ray tube according to the present invention. B is an explanatory view showing the operation of the joint mechanism used in the embodiment. FIG.

FIG. 2 is an explanatory diagram showing the whole of the embodiment.

FIG. 3A is a graph showing a change in tension distribution of a mask in the example. B is a graph showing the relationship between the resonance frequency and the range in which shaking occurs in the same example.

FIG. 4 is an explanatory diagram showing a main part of another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an entire conventional example.

FIG. 6 is a graph showing a relationship between a pressure point and a tension distribution in a conventional example. B is a graph showing the relationship between the resonance frequency and the range in which shaking occurs in the conventional example.

[Explanation of symbols]

 1 Frame 1A, 1B Side part 2 (2A, 2B) Pressurizing means 4 Slit 5 Metal thin plate 5a Grid element body 6 Mask 7 First arm member 8 Second arm member 9 Third arm member 10 (10a, 10b) , 10c) Equalizing mechanism 12, 13, 14 Pressurizing point

Claims (4)

[Claims] 1. A color selection grid structure comprising a plurality of strip-shaped grid elements arranged at a predetermined pitch and having beam transmission holes formed between the grid elements in a state in which a side portion of a frame is pressed. In an assembling method of a color selecting mechanism for a cathode ray tube having a step of erection on the side portion, when the frame is divided into four quadrants, three or more pressure points are applied per quadrant according to a tension distribution to be applied to the grid structure. A method for assembling a color selection mechanism for a cathode ray tube, characterized by applying pressure at points. 2. The method of assembling a color selecting mechanism for a cathode ray tube according to claim 1, wherein one of the pressurizing points is arranged in the vicinity of the welding point of the frame. 3. The pressure is applied so that the stress at the pressure point on the end side is larger than the stress at the pressure point on the center side of the frame side portion. Assembling method of color selection mechanism for cathode ray tube. 4. The cathode line according to claim 1, wherein the grid element is pressurized so that the increment of the tension gradually increases from the central portion to the end portion of the frame side portion. Assembling method of tube color selection mechanism.