JPH097504A - Assembly method for color cathode-ray tube - Google Patents

Abstract

PURPOSE: To position a mask against a panel so as to keep a predetermined position relation even without positioning the mask against the panel directly and actually, allow no chance of damaging the panel, especially its inner face by a welding gun, and obtain necessary and sufficient value of welding pressure by using a large welding gun. CONSTITUTION: A distance from a plane defined by three pins 3, which are fitted into a support structure 7 on the inner face of a panel 1 and are to be positioning references, is measured in advance, a mask 4 is set at mask receivers 8, and a frame 6 is supported by the support structure 7 via three dummy pins instead of pins so as to position at a place corresponding to the mask 4 on the mask receiver 8. The heights of the respective dummy pins 12 are adjusted so that the distance of the panel inner face from one plane defined by the dummy pins 12 coincides with the distance measured in advance, and in that state the frame 6 and the mask 4 are welded mutually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a color cathode ray tube, and more particularly to a frame having a supporting structure for fitting to a panel pin provided on a cathode ray tube panel and a mask forming a color selection electrode (or fitting to a panel pin). A washer
A support structure that is fixed to a frame that is fixed to a mask that forms a color identification electrode, and has a loose fitting portion in which a pin protruding from the washer is loosely fitted), and the pin is fitted to the supporting structure (or washer). The present invention relates to a method for assembling a color cathode ray tube in which the mask is welded to the panel so that the mask has a predetermined positional relationship.

[0002]

2. Description of the Related Art In a color cathode ray tube, it is necessary to form a fluorescent screen on the inner surface of a cathode ray tube panel and to provide a mask, for example, a shadow mask, which constitutes a color selection electrode on the inner surface of the panel as appropriate. The mask is generally fixed to the frame,
Three or four supporting structures composed of leaf springs and the like are fixed to the frame, and the mask is integrated with the frame through the three or four pins provided on the cathode ray tube panel in the supporting structure. Often assembled.

A general technique for manufacturing a color cathode ray tube using such a shadow mask as a color selecting electrode will be briefly described. The shadow mask main body is supported by a frame welded to the peripheral portion thereof. A base of a plate spring (supporting structure) having a through hole at its tip is welded to the outer peripheral wall of each side of the frame, while a panel pin fitted to the above through hole is provided on the skirt of the panel. After the position of the frame is fixed with respect to the panel by fitting each panel pin into the through hole of the corresponding plate spring, the shadow mask is aligned with the panel as shown in FIG. Weld the mask and frame while aligning.

This alignment is performed so that the Q value, which is the distance from the inner surface of the panel of the mask, matches a predetermined value.
The deviation of the Q value causes a remarkable deterioration of the image quality, which is very important. In the drawings, 1 is a panel, 2 is a fluorescent film, and 3 is
Is a panel pin, 4 is a shadow mask, and 5 is a mask support that supports the mask 4. By moving up and down, the Q value (the distance between the inner surface of the panel 1 and the shadow mask 4) can be adjusted. 6 is a frame, 7 is a leaf spring, and has a fitting hole 7a into which the panel pin 3 is fitted.

The frame 6 and the skirt portion 4a of the shadow mask 4 are welded (generally resistance welding) when the Q value reaches a predetermined set value. As a result, the Q value is fixed and fixed. There is also a method of fixing the Q value by welding a plate spring fixed to the frame and a washer, instead of fixing the Q value by welding the mask and the frame. In this case, the washer is formed so as to fit with the panel pin, and the plate spring is provided with an escape hole into which a portion of the panel pin protruding from the washer is inserted with play.

[0006]

By the way, the conventional method as described above, that is, the method of actually aligning the mask with the cathode ray tube panel and fixing the positional relationship by welding in that state is as follows. There was a problem. First, since it is necessary to put the welding gun in the narrow gap between the mask and the panel for welding work, the panel may be damaged. And the scratches on the inner surface of the panel
When the air in the valve is evacuated to a vacuum in the manufacturing process, it may cause the destruction of the valve, which not only causes a defect, but also causes a work risk. Secondly, since it is necessary to use a thin welding gun because it is necessary to carry out welding work in a narrow gap, there is a problem in that it is difficult to apply the pressing force required for welding and welding defects easily occur. It was

Thirdly, there is a problem that splash generated during welding adheres to the inner surface of the panel and becomes dust, which causes deterioration of image quality. When dust adheres to the inner surface of the panel, the dust is harder to remove than the dust on the mask and is extremely troublesome, and a large amount of non-negligible loss occurs due to the occurrence of defects due to the dust. Fourthly, there is a problem that the mask and the panel need to be attached and detached, and therefore, a device for attaching and detaching the mask and the panel is required.

The present invention has been made to solve such a problem, and the mask has a predetermined positional relationship with the panel without actually aligning the mask with the cathode ray tube panel. The welding gun eliminates the risk of damage to the panel, especially the inner surface of the panel, and the use of a large welding gun enables the welding pressure to be adjusted to the necessary and sufficient value. It is an object of the present invention to eliminate the possibility that the splash may adhere to the panel, especially to the fluorescent screen forming portion on the inner surface thereof, and to eliminate the need to attach and detach the mask and the panel to establish and fix the positional relationship, thus improving the mass productivity.

[0009]

The method for assembling a color cathode ray tube according to the present invention is determined by three panel pins which serve as a positioning reference among a plurality of pins fitted to a support structure (or washer) on the inner surface of the panel. Measure the distance from one plane, set the mask on the mask holder, and use the three dummy pins instead of the panel pins to make the frame on the support structure (or the washer by the dummy pin) correspond to the mask on the mask holder. It is supported so that it is located at a certain position, and the height of each of the dummy pins is adjusted so that the distance of the inner surface of the panel from one plane determined by the three dummy pins substantially matches the distance measured above. In this state, the frame and the mask (or the washer and the support structure) are welded together.

[0010]

According to the method of assembling the color cathode ray tube of the present invention,
By adjusting the height of the three dummy pins supporting the frame or washer with respect to the mask set on the mask receiver with respect to the mask, the mask is placed in a predetermined positional relationship with respect to the plane determined by the dummy pins, that is, substantially entirely. Since the Q value (or grill height) is obtained, the mask is then aligned in a predetermined positional relationship with the inner surface of the panel when the dummy pins are replaced with the panel pins of the cathode ray tube panel. Therefore, at that time, when the mask and the frame (or the washer and the support structure) are welded, the position of the mask with respect to the panel is fixed and fixed in a predetermined positional relationship. Therefore, it is possible to make the mask have a predetermined positional relationship with the panel without actually aligning the mask with the CRT panel.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is for explaining one embodiment of a method for assembling a color cathode ray tube according to the present invention. (A) is a sectional view of the panel, (B) is an inner view of the panel, and (C) is a state during positioning. Sectional drawing shown, (D) is a point diagram showing a positioning point. In the present embodiment, a plate spring (supporting structure) welded frame is welded to the shadow mask set in the mask receiver after the Q value is adjusted by the dummy pin, which is determined by the panel pin on the inner surface of the cathode ray tube panel. It is necessary to grasp or measure the positional relationship with respect to the plane. The measurement is illustrated in FIGS. 1A and 1B.

There are cathode ray tubes in which a frame supporting a mask is supported at three points by a panel and one in which a frame is supported by a panel. In the case of three-point support, a plane determined by the three panel pins, specifically, one plane in which the centers of the three panel pins exist serves as a reference plane that represents the position of the inner surface of the panel. It is called a plane. In addition, for the four-point support type, three are selected from the four panel pins, and one plane where the centers of the three panel pins exist is the pin plane. Thus, the number of panel pins that determine the pin plane is set to three because one plane is specified by three points. Since the cathode ray tube of this embodiment supports four points, three of the four panel pins 3a, 3b, 3c and 3d, for example, 3a,
3b and 3c [see FIG. 1 (B)] are selected as the panel pins that determine the pin plane.

Then, arbitrary plural points on the panel 3 are set as measuring points on the inner surface. In this example, as shown in FIG. 1 (B), the center P1 and four corners (inside the corner) P
The measurement points are 2, P3, P4, and P5. Then, the distances A1 to A5 of the inner surface of the panel 1 at the measurement points P1 to P5 from the pin plane are measured. This measurement is panel pin 3
The plane which is supported by the fitting portion where a, 3b and 3c are fitted and which is determined by the fitting portion (which coincides with the pin plane of the set cathode ray tube panel 1) has been measured in advance as a predetermined value. It can be measured very easily using a measuring device. In this way, the positional relationship between the inner surface of the cathode ray tube panel 1 which becomes the fluorescent screen and the pin plane is measured in advance.

On the other hand, the shadow mask 4 is set on the receiving surface 9 on the mask receiver 8. The mask receiver 8 is formed in a concave curved surface such that the upper surface thereof coincides with the front surface of the shadow mask 4, and the concave curved surface serves as a receiving surface (mask receiving reference curved surface) 9 that receives the shadow mask 4 downward. Reference numeral 10 denotes a virtual panel reference curved surface that is displaced from the mask receiving reference curved surface 9 by a preset predetermined Q value to the mask front side (lower side in this example), and with respect to the shadow mask 4 set in the mask receiving 8 and a cathode ray tube. It is a virtual curved surface that the inner surface of the panel when the panel 1 is assembled should exist.

Around the mask receiver 8, three dummy pin mechanism portions 11 are provided for each panel pin 3 of the cathode ray tube panel 1.
It is provided to correspond to. Each dummy pin mechanism 11 is configured to move the dummy pin 12 in the vertical direction (corresponding to the axial direction of the cathode ray tube) and in the lateral direction so that the dummy pin 12 can be moved toward and away from the mask 4 on the mask receiver 8. ing. Then, each dummy pin 12a,
12b, 12c (pin 3 used to specify a pin plane which is a reference plane expressing the position of the inner surface of the cathode ray tube panel 1)
the dummy pins corresponding to a, 3b, and 3c) to the frame 6
Each plate spring (support structure) 7, 7, 7, fitting hole 7
The frame 6 is supported above the shadow mask 4 by being fitted to the a, 7a and 7a.

Thereafter, the dummy pins 12a, 12b, 1
Adjust the height of 2c to adjust the dummy pins 12a, 12b, 12
The plane determined by c is located on the pin plane of the panel, assuming that the panel inner surface is located on the virtual panel reference plane. This adjustment can be easily performed because the distances A1 to A5 from the pin plane of the inner surface of the panel at the measurement points P1 to P5 of the cathode ray tube panel 1 have been measured. That is, the distance from the plane formed by the dummy pins to the mask receiving reference curved surface 9 is the measured distances A1 to A.
This is because the Q value should be subtracted from 5.

Then, when the adjustment is completed, that is, the mask 4 and the pin plane (the plane formed by the dummy pins 12a, 12b, and 12c cannot be said to be the pin plane as it is, but at the stage where the above-mentioned position adjustment is completed, the pin plane is formed. Is equivalent and can be said to be a pin plane.) In other words, when it can be said that the Q value has reached a predetermined value, the welding of the frame 6 and the shadow mask 4 is not shown. Machine. As a result, the Q value of the mask 4 is fixed and fixed. After welding, the dummy pins 12a, 12b, 12
c escapes to the outside. Therefore, it is not necessary to attach and detach the panel and the mask. The portion corresponding to the fourth pin 3d is, for example, actually matched, that is, the mask 4 is actually set on the cathode ray tube panel 1 by its three-point support, and the pin 3d is fitted with the corresponding plate spring 7. The leaf spring and the frame can be welded after they are fitted into the hole 7a and positioned (actually matched).

According to such a color cathode ray tube assembling method, the three dummy pins 12 for supporting the frame 6 with respect to the shadow mask 4 set on the mask receiver 8 are provided.
By adjusting the heights of a, 12b, and 12c with respect to the mask 4, the shadow mask 4 is provided in a predetermined positional relationship with respect to the plane determined by the dummy pins 12a, 12b, and 12c, that is, a predetermined Q value is obtained almost entirely. Therefore, at this time, the mask 4 has the dummy pins 12a, 12b, 1
2c are mask pins 3a, 3b, 3 of the cathode ray tube panel 1.
The panel 1 is positioned in a predetermined positional relationship with the panel 1 when replaced with c. Therefore, when the mask 4 and the frame 6 are welded at that time, the position of the mask 4 with respect to the panel 1 is determined and fixed in a predetermined positional relationship. Therefore, it is possible to make the mask 4 have a predetermined positional relationship with the panel 1 without actually actually aligning the mask 4 with the CRT panel 1.

Therefore, the welding gun eliminates the possibility of scratching the panel 1, particularly the inner surface thereof, and the use of a large welding gun makes it possible to set the pressing force to a necessary and sufficient value, and the splash at the time of welding the panel. In particular, there is no danger of sticking to the fluorescent screen forming portion on the inner surface thereof, and there is no need to attach and detach the mask 4 and the panel 1 to determine and fix the positional relationship, and mass productivity can be improved.

FIG. 2 is a sectional view for explaining the second embodiment of the method for assembling the color cathode ray tube according to the present invention. In this embodiment,
The shadow mask 4 is previously welded to the plate spring (supporting structure) 7 and the welded frame 6 in advance, and the shadow mask 4 is set on the mask receiver 8 while the dummy pin 1
2a, 12b, 12c is fitted with washers 14, 14, 14 to adjust the height of the washers 14, 14, 14, and then,
The Q value is fixed and fixed by welding the washers 14, 14, 14 and the corresponding plate springs 7, 7, 7.

In other respects, there is no particular difference from the first embodiment. Of course, as in the case of the first embodiment, the panel pins 3a, 3b, 3 on the inner surface of the panel 1 are used.
The plane determined by c, that is, the distance A1 to the pin plane
It goes without saying that A5 is measured in advance. In FIG. 2, 15 is a fitting hole for the washer 14, 13 is a clearance hole for the leaf spring 14, and the tip of the pin 12 protruding from the fitting hole 15 of the washer 14 is inserted with play. This embodiment also has exactly the same effects as the first embodiment.

FIG. 3 is a sectional view showing a modification of the second embodiment shown in FIG. The present method for assembling a color CRT is one in which the present invention is applied to the assembly of a Trinitron (trademark) type color CRT, and is welded to the upper and lower edges of an aperture grill (also a kind of mask) 4a which is a color selection electrode. The grille height GH (corresponding to the Q value) is obtained by holding a pair of supporting members (A members) 6a, 6a by a pair of elastic members (B members) 6b, 6b while pulling the aperture grill 4a.
Is fixed and fixed. Specifically, the aperture grill 4a in a state of being welded to the support members 6a and 6a held by the elastic members 6b and 6b at the plurality of receiving portions 8a of the mask receiver 8 is used as the mask receiver of the mask receiver 8. Part 8a, 8a ... The elastic member 6b,
6b, a plate spring (support structure) 7 on the support member 6a,
7 and 7 have already been welded.

On the other hand, the dummy pins 12a, 12b, 12c
The washers 14, 14, 14 are externally fitted to the washers 14, 1,
Adjust the height of 4, 14 and then each washer 14, 1
The grill height (Q value) is fixed and fixed by welding the plate springs 4, 14 and the corresponding plate springs 7, 7, 7. The method of assembling this color CRT is the same as that of the second embodiment except that the mask is an aperture grill. There is no difference in the effect.

[0024]

According to the method of assembling a color cathode ray tube of the present invention, the mask can be brought into a predetermined positional relationship with the panel without actually aligning the mask with the cathode ray tube panel. Therefore, the welding gun eliminates the risk of scratching the panel, especially the inner surface of the panel, and the large welding gun makes it possible to set the pressing force to a necessary and sufficient value. Eliminates the possibility of sticking to the fluorescent screen,
Since it is not necessary to attach and detach the mask and the panel to fix and fix the positional relationship, mass productivity can be improved.

[Brief description of drawings]

1A to 1D are for explaining a first embodiment of a method for assembling a color CRT according to the present invention,
(A) is a cross-sectional view of a cathode ray tube panel, (B) is an inner view of the panel, (C) is a cross-sectional view showing a state during positioning,
(D) is a positioning point diagram.

FIG. 2 is a cross-sectional view showing a second embodiment of the method for assembling the color cathode ray tube of the present invention.

FIG. 3 is a sectional view showing a modification of the second embodiment.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

1 CRT panel 3 Panel pin 4 Mask (shadow mask) 4a Mask (aperture grill) 6 Frame 6a, 6b Frame for aperture grill [Supporting member (A member) / Elastic member (B member)] 7 Supporting structure (leaf spring) 8 Mask Receiving 12 dummy pins

Claims (2)

[Claims] 1. A frame having a supporting structure fitted to a plurality of panel pins provided on a cathode ray tube panel, and a mask forming a color selection electrode with respect to the panel when the panel pins are fitted to the supporting structure. In the method for assembling a color CRT in which the mask is welded so as to have a predetermined positional relationship, three panel pins serving as a positioning reference among a plurality of panel pins fitted to the support structure on the inner surface of the CRT panel. The distance from one plane determined by the above is measured, the mask is set on the mask receiver for receiving the mask, and three dummy pins instead of the panel pins are used to support the frame by the support structure on the mask receiver. By supporting it so that it is located at a position corresponding to, and adjusting the height of each dummy pin above. The distance between the inner surface of the panel and one plane determined by the three dummy pins is made to match the previously measured distance, and in that state, the panel and the mask are welded to each other. Assembly method 2. A play in which the same number of washers fitted to a plurality of panel pins provided on a cathode ray tube panel and a frame fixed to a mask forming a color identification electrode, and panel pins protruding from the washers are loosely fitted. In a method for assembling a color cathode ray tube, wherein a support structure having a fitting portion is welded so that the mask has a predetermined positional relationship with the panel when the pin is engaged with the washer, the inner surface of the cathode ray tube panel Of the plurality of panel pins fitted to the support structure, the distance from one plane determined by the three pins serving as the positioning reference among the plurality of panel pins is measured, and the frame having the support structure is provided in the mask receiver for receiving the mask. Set the mask fixed to the washer, and use the three dummy pins instead of the panel pins to face the washer to the corresponding supporting structure. By supporting each of the dummy pins and adjusting the height of each of the dummy pins so that the distance of the inner surface of the panel from one plane determined by the three dummy pins matches the distance measured above. In this state, the washer and the support structure are welded to each other to assemble the color cathode ray tube.