JPH0541178A - Frame for shadow mask structural body, and method and device for manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the assembling precision of a frame composing a shadow mask structural body with a supporting structural body, and reduce deterioration of the quality due to friction of the frame with a manufacturing device in an assembling process. CONSTITUTION:Positioning holes 27-29 are provided on a frame flange part 2, and the positioning holes 27-29 are engaged with positioning pins 57-59 on a manufacturing device provided corresponding to them. A frame 2 can thus be positioned to a supporting structural body (spring 4) with good precision without fixing a frame skirt part 21.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, in a color buran 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, and one of them is a shadow mask structure using what is called a shadow mask formed by pressing a thin metal plate having a large number of round holes or elongated holes. is there.

This shadow mask structure is, for example, as shown in FIG. 7, a press-formed plate thickness of 0.1 to 0.3.
mm shadow mask 1, and a frame 2 having a plate thickness of 0.8 to 2.0 mm for reinforcing the shadow mask 1,
One end is welded and fixed to the frame 2, and the other end is composed of a spring 4 having a fitting hole 41 for fitting a panel pin embedded in a panel (not shown).

Between the spring 4 and the frame 2, a clip 3 made of a bimetal material for correcting thermal deformation due to temperature rise during operation of the color cathode-ray tube is arranged, if necessary. Spring 4 alone or spring 4
The combination of the clip 3 and the clip 3 is generically called a support structure (indicated by reference numeral 4 in the drawing). The frame 2 is composed of a frame skirt portion 21 that is parallel to the tube axis of the color CRT for joining the shadow mask 1 and a frame flange portion 22 that extends inward and is perpendicular to the tube axis.

This shadow mask structure is prepared by first forming a frame structure by welding and fixing the frame 2 and the supporting structure using a predetermined device, and then by welding and fixing the frame structure and the shadow mask 1 at several places. Be done.

At the time of producing the frame structure, as shown in FIG. 8, the frame 2 has its frame skirt portion 21 positioned on the frame positioning block 51 on the frame structure manufacturing apparatus.
It fits in and puts out a predetermined position. In the support structure 4, the fitting hole 41 of the support structure 4 is fitted into the simulated panel pin 53 on the device corresponding to the panel pin, and the other end is brought into contact with the support structure positioning block 52 to bring out a predetermined position.

[0007]

In the conventional manufacturing of the frame structure, since the frame skirt 21 is used to position the frame 2 as described above, when the frame skirt 21 is deformed, the entire frame is There is an inconvenience that the position accuracy is lost.

Further, since the outer dimensions of the frame vary, if a frame having a large outer dimension 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 The blackened film that has been treated to
The problem that the pores of the shadow mask are blocked in the color cathode ray tube occurs.

On the other hand, when the outer dimension of the frame is small, the frame positioning block 51 only hits one side, so that the frame position changes each time welding is performed, and the position accuracy cannot be ensured. If the frame position accuracy is not high, there is a disadvantage that the effective screen coated with the phosphor is tilted or deviated from the panel outer shape on the color CRT.

Further, in the thermal deformation correction mechanism using a clip, the positional dimensions of the clip 3 and the panel pin affect the correction amount, so if the frame position accuracy is poor, unbalanced correction is performed and color purity is improved. Has the disadvantage that it decreases.

The present invention has been made to solve the above problems, and provides a frame for a shadow mask structure capable of improving the assembly accuracy of a shadow mask structure for a color cathode ray tube, a manufacturing method thereof, and a manufacturing apparatus thereof. The purpose is to do.

[0012]

In order to achieve the above object, the structure frame for a shadow mask according to the invention of claim 1 is provided with a positioning hole for positioning the frame in its frame flange portion, Desirably,
According to a second aspect of the present invention, 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 claim 3, the positioning holes in the invention of claim 1 are provided at three positions of the frame flange portion, and all the positioning holes are elongated holes having straight portions.

The manufacturing method according to the invention of claim 4 is
A frame with positioning holes in the frame flange,
It is characterized in that the positioning hole is used to fit the frame positioning pin provided on the manufacturing apparatus to accurately position the frame and to attach the support structure.

Further, in the manufacturing apparatus according to the invention of claim 5, in the apparatus for assembling the support structure to the frame, when the frame having the positioning holes in the frame flange portion is set on the apparatus, the apparatus corresponding to the positioning holes is mounted on the apparatus. Positioning pins that can be fitted into the positioning holes are provided at positions, and the frame is accurately set at a predetermined position on the device to improve the mounting accuracy with the support structure.

[0015]

According to the first aspect of the present invention, the frame can be stably and reliably set on the device by fitting the positioning hole provided on the frame flange portion to the positioning pin provided on the device. As described above, it is not necessary to fix the frame skirt portion of the frame, and there is no conventional inconvenience associated therewith.

Further, according to the invention of claim 2, when two positioning holes are provided in the frame flange portion and one is a circular hole and the other is a long hole, the short side of the frame is formed by the circular 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
Since the movement in the X and Y directions is regulated and the movement in the rotational direction is regulated by the straight portion of the long hole, the frame is X-
It will be fixed accurately in the Y plane.

When three positioning holes are provided in the frame flange portion as in the third aspect of the invention and all the three positioning holes are straight holes, the two flat holes form the plane surface of the frame flange portion. The movement of the inside in the Y-axis direction is regulated, the movement in the X-axis direction is regulated by the remaining one long hole, and the frame is accurately fixed in the XY plane.

Further, according to the invention of claim 4, a positioning hole provided in the frame flange portion is utilized, and the positioning hole is fitted to a positioning pin on the apparatus,
Since the frame is positioned on the device, the support structure can be attached accurately. Moreover, since the frame skirt portion is not fixedly positioned, the variation of the frame outer shape, the peeling of the blackening film and the deviation of the effective screen due to the deformation of the frame skirt portion are eliminated.

Further, according to the invention of claim 5, a positioning block for fixing the frame skirt portion is not required on the apparatus, and instead, a positioning pin fitted into a positioning hole provided in the frame flange portion of the frame is provided. Since the structure is provided on the device, the device itself does not need to be significantly improved, and the frame and the support structure can be attached more accurately than in the conventional case.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 portion, 22 is a frame flange portion, 27 to 29 are positioning holes provided in the frame flange portion 22, 4 is a spring, 41 is a spring fitting hole, and 52 is manufacturing. A support structure positioning block mounted on the apparatus for positioning 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 to be fitted is a corner block 54 for positioning the frame flange portion 22 in the pipe axis direction.

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

The frame 2 has three positioning pins 57 to 59 arranged on the apparatus, and the frame flange portion 2 thereof.
The positioning holes 27 to 29 provided in No. 2 are set so that they can be fitted together. When the frame 2 is placed on the device, especially the positioning holes 27 to 29 and the positioning pins 57 to 59.
The order of fitting with is not specified, but 1
Make sure that the parts are fitted one by one.

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

Next, as shown in FIG. 4, the positioning hole 29 and the positioning pin 59 on the other short side are fitted together.
In this state, the two positioning holes 27 and 29 and the positioning pins 57 and 59 restrict the movement in the Y-axis direction and the rotation direction. However, as shown in the figure, since the straight portions of the two positioning holes 27 and 29 are parallel to each other in the X-axis direction, their movements are not restricted, and the frame does not have the X-axis direction as shown by the broken line. 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 to each other, and the straight rod-shaped positioning pin 58 is fitted to the straight portion of the positioning hole 28. 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 the corner block 54 for positioning in the tube axis direction on the apparatus, and the positioning in the Z (tube axis) direction is completed. .. In this state, a frame holder (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 to the simulated panel pin 53 of the device corresponding to the panel pin, as in the conventional case.
The other end of the spring 4 is brought into contact with the support structure positioning block 52 to bring it to a predetermined position and fixed by spot welding.

As a practical application example of the above embodiment, for example, in a 21-inch color CRT frame, the distance 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 equipment is 4.95 mm (cross +
0.0, -0.05), but the variation in assembly accuracy was reduced to about 1/3 of the conventional method.

Embodiment 2 As another embodiment, for example, as shown in FIG. 5, two positioning holes 25 and 26, one of which has a round hole shape and the other of which has a long hole shape having a straight portion, There is one using two round bar-shaped positioning pins 55 and 56 provided on the device.

In the case of this embodiment, the X- and Y-directions are regulated by the round hole-shaped positioning hole 25 and the round bar-shaped positioning pin 55, and then the straight portion of the elongated hole-shaped positioning hole 26, The movement in the rotation direction is restricted by the round bar-shaped positioning pin 56, and the frame is completely fixed in the XY plane. After that, the 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 33-inch color cathode ray tube, a circular hole for positioning on the frame flange has a diameter of 8.0 m.
m (crossing +0.1, -0.0), the diameter of the round bar positioning pin on the device is 7.95 mm (crossing +0.0, -0.0)
5), the variation in the assembly accuracy was reduced to about 1/3 of that of the conventional one, as in the first embodiment.

At this time, if both the positioning holes are round holes, it is necessary to suppress the dimensional accuracy between the round holes to 5/100 or less, and the dimension between the round holes is about 800 mm.
Considering thermal deformation and other mechanical deformation during the blackening treatment, the positioning pin does not need the positioning hole. However, in this respect, according to the present invention, the positioning of the frame is performed with the accuracy of the positioning hole and the positioning pin, and the distance variation between the positioning holes does not affect the accuracy. There is nothing to do.

Although the positioning hole is arranged on the X axis in the above embodiment, it may be arranged on the Y axis or on the diagonal axis, or may be arranged on any portion other than the above axis. However, in order to reduce the rotational component, it is desirable to set the distance between the positioning holes as large as possible.

Embodiment 3 As an embodiment of a manufacturing apparatus for a shadow mask structure frame, for example, as shown in FIG. 6, a round bar positioning pin 57 has a position adjusting mechanism. The round bar positioning pin 57 equipped with this position adjusting mechanism is provided with a slide portion 61.
The slide portion 61 is fixed to the rail portions 62 and 63 by screwing. 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 frame is subject to dimensional variations due to its press working, blackening treatment which is a heat treatment, etc., and the variations tend to occur among manufacturing lots. When the positioning pin is fixed with the design value as the target, the tendency of the frame manufacturing lot is measured, and the positioning pin can be moved so that the positioning of the frame structure can be adjusted based on the data.

This positioning movement distance is the dial gauge 6
Since it is controlled by No. 4, if there is lot-to-lot data of frames, it can be adjusted quickly and accurately. Further, since the round bar positioning pin repeats continuous fitting with the frame, a dimensional change due to abrasion occurs during use, and therefore the round bar positioning pin is fixed by screws so that it can be replaced.

In the case of the first embodiment, the movement distance of the positioning pin is the direction perpendicular to the parallel portion of the positioning hole, and X
The positioning pins 57 and 59 on the shaft 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 by, the positioning pin 55 corresponding to the circular hole-shaped positioning hole 25 is movable in the X and Y directions, and the positioning pin 56 corresponding to the long hole-shaped positioning pin 26 is movable in the Y direction. Since the round bar-shaped positioning pin 55 has to 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, the variation in the assembly accuracy can be greatly reduced as compared with the conventional one, the friction between the device and the frame at the time of positioning the frame can be reduced, and the frame can be prevented from rubbing. The various inconveniences associated therewith can be eliminated, and the reliability of the product can be improved.

[Brief description of drawings]

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

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

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

FIG. 4 is a view showing a frame according to an embodiment of the present invention, which has a long hole 3
It is a figure which shows the state when a positioning pin is fitted in two positioning holes on the X-axis among the 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 a manufacturing apparatus according to an embodiment of the present invention.

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

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

[Explanation of symbols]

 1 Shadow Mask 2 Frame 22 Frame Flange 25-29 Positioning Hole 55-59 Positioning Pin

Claims (5)

[Claims] 1. A shadow mask structure frame comprising: a frame for fixing and holding a shadow mask; and a supporting 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 the frame is provided in a frame flange portion that is positioned substantially perpendicular to the axis of the color CRT. 2. A positioning hole is provided on the frame flange portion.
The shadow mask structure frame according to claim 1, wherein the shadow mask structure frame is formed by combining a plurality of long holes each having a straight portion and a round hole. 3. A positioning hole is provided in the frame flange portion.
The frame for a shadow mask structure according to claim 1, wherein each of the individual holes is an elongated hole having a straight portion. 4. A frame having a positioning hole in a frame flange portion is fitted to a frame positioning pin provided on the device by utilizing the positioning hole, thereby accurately positioning the frame on the device, A method of manufacturing a frame for a shadow mask structure, characterized in that a supporting structure is attached to the frame. 5. A support structure for positioning a corner block for positioning the frame flange portion in the pipe 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 device for manufacturing a frame for a shadow mask structure including a positioning block, when setting a frame having a positioning hole in a frame flange portion on the device, at a position on the device corresponding to the positioning hole, the positioning hole An apparatus for manufacturing a frame for a shadow mask structure, which is provided with a positioning pin that can be fitted.