JP2576721B2 - Frame for shadow mask structure, method of manufacturing the same, and apparatus for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame for a shadow mask structure for a color cathode ray tube, a method of manufacturing the same, and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art Generally, in a color uranium tube,
A color selection electrode assembly is arranged between the electron gun and the phosphor so that the electron beam emitted from the electron gun reaches only a predetermined phosphor. There are several types of this color selection electrode structure. One of them is a shadow mask structure using a so-called shadow mask formed by pressing a thin metal plate having a large number of round holes or long holes. is there.

[0003] As shown in FIG. 7, this shadow mask structure has a press-formed plate thickness of 0.1 to 0.3, for example.
a shadow mask 1 having a thickness of 0.8 to 2.0 mm to reinforce the shadow mask 1;
One end is fixed to the frame 2 by welding, and the other end is constituted by a spring 4 provided with a fitting hole 41 for fitting into a panel pin embedded in a panel (not shown).

A clip 3 made of a bimetal material for compensating for thermal deformation due to a rise in temperature during operation of the color CRT is provided between the spring 4 and the frame 2 as required. Spring 4 alone or Spring 4
The combination of the and the clip 3 is collectively called a support structure (indicated by reference numeral 4 in the drawing). The frame 2 includes a frame skirt portion 21 parallel to the tube axis of the color CRT for joining with the shadow mask 1 and a frame flange portion 22 extending inward perpendicular to the tube axis.

[0005] This shadow mask structure is prepared by first using a predetermined apparatus to form a frame structure in which the frame 2 and the support structure are welded and fixed, and then welding and fixing the frame structure and the shadow mask 1 in several places. Can be

As shown in FIG. 8, when the frame structure is produced, the frame 2 is moved to the frame positioning block 51 on the frame structure manufacturing apparatus.
To a predetermined position. The support structure 4 has a fitting hole 41 of the support structure 4 fitted to a simulated panel pin 53 on a device corresponding to the panel pin, and the other end thereof is brought into contact with a support structure positioning block 52 to project a predetermined position.

[0007]

In the conventional manufacturing of a frame structure, the frame 2 is positioned by using the frame skirt portion 21 as described above. Therefore, when the frame skirt portion 21 is deformed, the entire frame is formed. There is an inconvenience that the position accuracy is incorrect.

[0008] Further, since the frame outer dimensions vary, when a frame having a large outer shape is forcibly inserted into the frame positioning block 51, the frame skirt portion 21 is rubbed by the frame positioning block 51, and the surface of the frame 2 is exposed. The blackened film that has been treated is peeled off,
The disadvantage that the pores of the shadow mask are blocked in the color cathode ray tube occurs.

Conversely, when the outer dimensions of the frame are small, the frame positioning block 51 has only one contact, so that the frame position fluctuates every time welding is performed, and the positional accuracy is not ensured. If the frame position accuracy is not obtained, there is a disadvantage that the effective screen on which the phosphor is applied is inclined or shifted with respect to the panel outer shape on the color CRT.

In the thermal deformation correction mechanism using a clip, since the positional dimension between the clip 3 and the panel pin affects the correction amount, if the frame position accuracy is poor, unbalanced correction is performed and color purity is reduced. Is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a frame for a shadow mask assembly capable of improving the assembling accuracy of a shadow mask assembly for a color cathode ray tube, a method for manufacturing the same, and an apparatus for manufacturing the same. The purpose is to do.

[0012]

In order to achieve the above object, a frame structure for a shadow mask according to the first aspect of the present invention is provided with a positioning hole for positioning the frame in a frame flange portion thereof. Preferably,
As in the invention of claim 2, the positioning holes are provided at two positions of the frame flange portion, and the type of the positioning holes provided is a combination of a round hole and a long hole having a straight portion. As in the invention of the third aspect, the positioning holes in the invention of the first aspect are provided at three places of the frame flange portion, and each of the positioning holes is an elongated hole having a straight portion.

[0013] The manufacturing method according to the invention of claim 4 provides:
A frame with positioning holes in the frame flange
It is characterized in that the frame is accurately positioned by fitting the frame positioning pins provided on the manufacturing apparatus using the positioning holes, and the support structure is attached.

Further, according to a fifth aspect of the present invention, in the apparatus for assembling a support structure to a frame, when a frame having a positioning hole in a frame flange portion is set on the apparatus, the apparatus corresponds to the positioning hole. At this position, a positioning pin that can be fitted into the positioning hole is provided, and the frame is set at a predetermined position on the apparatus with high accuracy, thereby improving the assembling accuracy with the support structure.

[0015]

According to the first aspect of the present invention, the positioning hole provided in the frame flange is fitted to the positioning pin provided on the apparatus, so that the frame can be set on the apparatus stably and reliably. Thus, there is no need to fix the frame skirt portion of the frame, and there is no conventional inconvenience associated with this.

According to the second aspect of the present invention, when two positioning holes are provided in the frame flange portion, one is a round hole and the other is a long hole, the short side of the frame is formed by the round hole. When the line connecting the centers is the X-axis and the line perpendicular to the X-axis and passing through the center of the long side is the Y-axis, the round bar-shaped positioning pin is
The movement in the X and Y directions is restricted, and the movement in the rotation direction is restricted by the straight portion of the long hole.
It will be accurately fixed in the Y plane.

In the case where three positioning holes are provided in the frame flange portion as in the third aspect of the present invention, and all three of the positioning holes are straight holes having a straight portion, the two long holes have a flat surface of the frame flange portion. The movement in the Y-axis direction is restricted, and the movement in the X-axis direction is restricted by the remaining one long hole, so that the frame is accurately fixed in the XY plane.

According to the fourth aspect of the present invention, the positioning hole provided in the frame flange portion is used, and the positioning hole is fitted to the positioning pin on the device.
Since the frame is positioned on the device, the support structure can be accurately mounted. In addition, since the frame skirt is not fixedly positioned, variations in the outer shape of the frame, peeling of the blackened film due to deformation of the frame skirt, and deviation of the effective screen are eliminated.

Further, according to the fifth aspect of the present invention, a positioning block for fixing the frame skirt is not required from the apparatus, and a positioning pin to be fitted into a positioning hole provided in a frame flange of the frame is used instead. Since the configuration is provided on the device, no significant improvement is required for the device itself, and the frame and the support structure can be attached with higher accuracy than in the related art.

[0020]

An embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a perspective view showing a frame and a frame structure manufacturing apparatus according to an embodiment of the present invention. In FIG. 1, 2 is a frame, 21 is a frame skirt, 22 is a frame flange, 27 to 29 are positioning holes provided in the frame flange 22, 4 is a spring, 41 is a spring fitting hole, and 52 is a manufacturing hole. A support structure positioning block that is mounted on the apparatus and positions the support structure (in this embodiment, the spring 4 alone), 53 is a simulated panel pin corresponding to the panel pin, and 57 to 59 are fitted into the frame flange positioning holes 27 to 29. A round bar-shaped positioning pin 54 is a corner block for positioning the frame flange 22 in the tube axis direction.

As shown in FIG. 2, each of the positioning holes 27 to 29 has a long hole shape having a straight portion, and a line connecting the centers of the short sides of the substantially rectangular frame is perpendicular to the X axis and the X axis. Assuming that a line passing through the center of the long side is the Y axis,
One positioning hole is provided on the Y-axis so that the long axis of each long hole coincides with each axis.

The frame 2 has three positioning pins 57 to 59 disposed on the apparatus, and the frame flange 2
2 are set so that the positioning holes 27 to 29 provided in the fitting 2 can be fitted. When the frame 2 is placed on the apparatus, especially, the positioning holes 27 to 29 and the positioning pins 57 to 59
The order of fitting with is not specified, but for explanation, 1
It is in a state of fitting each other.

First, as shown in FIG. 3, the positioning hole 27 on the short side of the frame flange portion 22 is fitted with the positioning pin 57 on the apparatus. In this case, since the positioning hole 27 is a long hole having a straight portion and the positioning pin 57 is a round bar, the movement in the XY plane perpendicular to the tube axis of the frame is not restricted as shown in FIG. , The frame is free to move.

Next, as shown in FIG. 4, the positioning hole 29 on the other short side and the positioning pin 59 are fitted.
In this state, the movement in the Y-axis direction and the rotation direction is regulated by the two positioning holes 27 and 29 and the positioning hinges 57 and 59. However, as shown in the figure, since the straight portions of the two positioning holes 27 and 29 are parallel in the X-axis direction, the movement is not restricted, and the frame is moved in the X-axis direction as shown by the broken line. It is in a state where it can move freely in any direction.

Finally, as shown in FIG. 1, the positioning hole 28 on the long side and the positioning pin 58 are fitted together, and the round bar-shaped positioning pin 58 is fitted into the straight portion of the positioning hole 28, whereby X The axial movement is also restricted, and the frame is completely fixed in the XY plane.

When the frame 2 is inserted into the apparatus in the above state, the surface of the frame flange 22 hits a corner block 54 for positioning in the tube axis direction on the apparatus, and the positioning in the Z (tube axis) direction is also completed. . In this state, a frame retainer (not shown) facing the corner block 54
The frame 2 is pressed and fixed with.

Thereafter, the spring fitting hole 41 of the supporting structure (in this embodiment, the spring 4) is fitted into the simulated panel pin 53 of the device corresponding to the panel pin, as in the prior art.
The other end of the spring 4 is brought into contact with the support structure positioning block 52 to set a predetermined position, and fixed by spot welding.

As an actual application example of the above-described embodiment, for example, in a frame for a 21-inch color cathode-ray tube, the interval between the straight portions of the positioning holes on the frame flange portion 22 is 5.0 mm (intersection +0.1, -0. 0), the diameter of the positioning round bar pin on the manufacturing apparatus was 4.95 mm (intersection +
0.0, -0.05), but the variation in assembling accuracy was reduced to about 1/3 of that of the conventional system.

Embodiment 2 As another embodiment, for example, as shown in FIG. 5, two positioning holes 25 and 26 each having a round hole shape on one side and a long hole shape having a straight portion on the other side are provided. Some use two round bar-shaped positioning pins 55 and 56 provided on the apparatus.

In the case of this embodiment, the X and Y directions are regulated by the round hole-shaped positioning holes 25 and the round bar-shaped positioning pins 55. Next, the straight portions of the elongated hole-shaped positioning holes 26 The movement in the rotation direction is regulated by the positioning pin 56 having a round bar shape, and the frame is completely fixed in the XY plane. After that, a frame structure is manufactured in the same order as in the first embodiment.

As an actual application example of the above embodiment, for example, in a frame for a 33-inch color cathode-ray tube, a circular hole for positioning on a frame flange has a diameter of 8.0 m.
m (crossing +0.1, -0.0) and the diameter of the round bar positioning pin on the device is 7.95 mm (crossing +0.0, -0.0).
However, as in the first embodiment, the variation in the assembly accuracy was reduced to about 1/3 as compared with the conventional one.

At this time, if the two positioning holes are round holes, it is necessary to suppress the dimensional accuracy between the round holes to 5/100 or less. Since the distance between the round holes is about 800 mm,
In consideration of thermal deformation and other mechanical deformation during the blackening process, the positioning pin does not need the positioning hole. However, in this regard, in the present invention, the positioning of the frame is performed with the accuracy of the positioning hole and the positioning pin, and the variation in the distance between the positioning holes does not affect the accuracy, so that the positioning pin does not enter the positioning hole or the accuracy greatly varies. No.

In the above-described embodiment, the positioning holes are arranged on the X axis. However, they may be arranged on the Y axis or on a diagonal axis, or may be arranged on any part other than the above axis. However, in order to reduce the rotation component, it is desirable to increase the distance between the positioning holes as much as possible.

Embodiment 3 As an embodiment of an apparatus for manufacturing a frame for a shadow mask structure, for example, as shown in FIG. 6, a round bar positioning pin 57 is provided with a position adjusting mechanism. The round bar positioning pin 57 having this position adjusting mechanism is
The slide portion 61 is fixed to the rail portions 62 and 63 by screws. The moving distance of the slide portion 61 is measured by a dial gauge 64 attached so as to contact the slide portion 61.

The size of the frame varies due to the press working and the blackening process as a heat treatment, and the frame tends to vary among manufacturing lots. When the positioning pins are fixed with the design value as a target, the tendency of the frame manufacturing lot is measured, and the positioning pins can be moved so that the positioning of the frame structure can be adjusted based on the data.

This positioning movement distance is equal to the dial gauge 6.
4, the adjustment can be performed quickly and accurately if there is inter-lot data of the frame. Further, since the round bar positioning pin is repeatedly fitted into the frame, a dimensional change due to wear occurs during use, so that the round bar positioning pin is screw-fixed so that it can be replaced.

In the first embodiment, the moving distance of the positioning pin is a direction perpendicular to the parallel portion of the positioning hole.
The positioning pins 57 and 59 on the axis are in the Y direction, and the positioning pin 58 on the Y axis is in the X direction. In the case of the second embodiment, FIG.
As shown in the figure, the positioning pin 55 corresponding to the round positioning hole 25 can move in the X and Y directions, and the positioning pin 56 corresponding to the long positioning pin 26 can move in the Y direction. Since the positioning pin 55 in the shape of a round bar must move in the two directions of X and Y as described above, the moving structure is doubled.

[0038]

As described above, according to the present invention, variations in assembly accuracy can be greatly reduced as compared with the prior art, and rubbing between the device and the frame when positioning the frame can be reduced. Various inconveniences can be eliminated, and the effect of improving the reliability of the product can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a frame and a frame assembly manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a view showing a positioning hole provided in a frame flange portion according to an embodiment of the present invention.

FIG. 3 shows a frame according to an embodiment of the present invention.
It is a figure which shows the state when a positioning pin fits in one positioning hole on an X-axis among the positioning holes.

FIG. 4 shows a frame according to an embodiment of the present invention.
It is a figure which shows the state when a positioning pin fits in two positioning holes on an X-axis among these positioning holes.

FIG. 5 is a view showing a positioning hole provided in a frame flange portion according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a moving structure around a positioning pin of the manufacturing apparatus according to the embodiment of the present invention.

FIG. 7 is a perspective view showing the structure of a shadow mask structure.

FIG. 8 is a perspective view showing a conventional frame and frame structure manufacturing apparatus.

[Explanation of symbols]

 Reference Signs List 1 shadow mask 2 frame 22 frame flange 25-29 positioning hole 55-59 positioning pin

Claims (5)

(57) [Claims] 1. A shadow mask assembly frame comprising: a frame for fixedly holding a shadow mask; and a support structure attached to the frame and having a fitting hole fitted and supported by a panel pin.
A frame for a shadow mask structure, characterized in that a positioning hole for positioning a frame is provided in a frame flange portion located substantially perpendicular to a tube axis of a color cathode ray tube. 2. A positioning hole is provided in a frame flange portion.
2. The frame for a shadow mask structure according to claim 1, wherein the frame is a combination of a long hole having a straight portion and a round hole. 3. A positioning hole is provided in a frame flange portion.
2. The shadow mask frame according to claim 1, wherein each of the plurality of frames is a long hole having a straight portion. 4. A frame provided with a positioning hole in a frame flange portion is fitted to a frame positioning pin provided on the apparatus by using the positioning hole, whereby the frame is accurately positioned on the apparatus. A method for manufacturing a frame for a shadow mask structure, comprising attaching a support structure to the frame. 5. A support structure for positioning a corner block for positioning the frame flange in the tube axis direction, a simulated panel pin corresponding to the panel pin, and a support structure provided with a fitting hole for fitting the panel pin. In a manufacturing apparatus of a frame for a shadow mask structure having a positioning block, when setting a frame provided with a positioning hole in a frame flange portion on the apparatus, a position on the apparatus corresponding to the positioning hole is set to the positioning hole. An apparatus for manufacturing a frame for a shadow mask structure, comprising a positioning pin that can be fitted.