JP3038798B2 - Manufacturing method of color cathode ray tube - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color cathode ray tube, and more particularly, to a method for welding a supporting spring to a color selection electrode.

[Summary of the Invention]

The present invention relates to a method of manufacturing a color cathode ray tube in which panel pins for attaching a color selection electrode are provided on the inner side walls of four sides of a panel, respectively, and three (first and second) of the four panel pins are provided. , 3) to form one reference plane, and in this reference plane, opposing second and third panels are formed.
The origin is a point of intersection between the X axis connecting the panel pins and the Y axis orthogonal to the X axis at the midpoint between the second and third panel pins.
After detecting the coordinate data of the first, second, third, and fourth panel pins, and positioning the four dummy pins of the spring welding machine based on the detected coordinate data, welding of the spring to the color selection electrode is performed. By doing so, it is possible to manufacture a so-called 4-pin support type color selection electrode with high accuracy and high productivity without affecting the panel.

[Conventional technology]

The color selection electrode of the color cathode ray tube is supported via a spring by a pin integrally provided on the inner wall of the panel. Normally, such a color selection electrode is supported by a three-pin support method in which pins are provided on inner walls on three sides of the panel.
With the increase in the size and definition of color cathode ray tubes, a four-pin support system in which pins are provided on the inner side walls of four sides of a panel has been adopted.

FIG. 8 shows an example in which a color selection electrode (1) is supported in a cathode ray tube panel (2) by a 4-pin support system. Panel (2)
Each pin (3) [(3
A), (3B), (3C) and (3D)] are provided integrally. On the other hand, a support spring (6) having an engagement hole (5) on each of four sides of the frame (9) of the color selection electrode (1).
[(6A), (6B), (6C) and (6D)]
The engaging holes (5) of the springs (6A), (6B), (6C) and (6D) correspond to the corresponding pins (3A), (3B) and (3C), respectively.
And (3D) are fitted and supported. As the color selection electrode (1), a shadow mask, an aperture grill or the like is used. In the example shown in the figure, a pair of opposing support members (7A) and (7B) and a U-shaped elastic member (8A) supporting both ends thereof are used. And (8B) using an aperture gully in which a large number of grid elements (10) are arranged at a predetermined pitch on a metal frame (9).

By the way, the pin (3) of the panel is provided on the inner wall of the panel with a slight error with respect to a predetermined position. For this reason, in the case of the 4-pin support type color selection electrode (1), at least the fourth spring (6D) is the fourth spring of the panel to be married (that is, the panel paired with the color selection electrode). The pins (3D) must be recognized and welded so that they fit properly.

In the conventional method, for example, three springs (6A), (6B) and (6C) are welded to a frame (9) of a color selection electrode (1) (actually, a holder fixed to the frame (9)), and then a color is obtained. Attach the sorting electrode (1) to the pins (3A), (3B) and (3C) of the panel to determine the relative positions of the panel (2) and the color sorting electrode (1). )
Was fitted to the fourth pin (3D) of the panel, and the other end was welded to the frame (9) of the color selection electrode (1) (that is, its holder).

As another method, a method disclosed in JP-A-53-75756 is also known. This is the frame 4 corresponding to the panel
A pin similar to a panel pin is integrally provided at the upper end on each side, and springs of the same length having an engagement hole at the lower end are attached, and the fourth spring among them can be independently slid vertically and horizontally. Then, a jig in which the other three springs are fixed is prepared. After the engagement holes of the three springs of this jig are fitted to the three pins of the panel, the fourth spring is slid and adjusted so that the engagement holes are fitted to the fourth pins of the panel. Fix the spring at that position. As a result, the relative positional relationship between the pins of the panel and the relative position of the pins of the spring become the same, so that the spring is welded to the color selection electrode outside the panel using the spring pins.

[Problems to be solved by the invention]

However, the former method has the following disadvantages.

(I) It is difficult to automate and it is difficult to form an automatic system line, and mass productivity is poor.

(Ii) It is necessary to mount and demount the panel and the color selection electrode.

(Iii) Since welding is performed inside the panel, dust due to splash or the like adheres to the inside of the panel, or the inside of the panel is damaged because an electrode of the welding gun enters the inside of the panel.

(Iv) There is not enough room for the electrode of the welding gun to perform welding, making it difficult to make equipment.

Also, the latter method has a drawback that it cannot cope with automation because of the work of adjusting the position and fixing the fourth spring.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a method of manufacturing a color cathode ray tube in which a 4-pin support type color selection electrode can be attached to a spring with high accuracy and high productivity.

[Means for solving the problem]

The present invention relates to a method for manufacturing a color cathode ray tube in which a panel pin (3) for attaching a color selection electrode is provided on each of four inner side walls of the panel (2), and the four panel pins (3A) to ( 3D), the first, second, and third panel pins (3A), (3B), and (3C) form one reference plane. X axis connecting panel pins (3B) and (3C) of the third, second and third pins
First, second, third and fourth with the origin at the intersection of the Y-axis perpendicular to the X-axis at the midpoint between the panel pins (3B) and (3C)
Detects the coordinate data (seven coordinate data) of the panel pins (3A), (3B), (3C) and (3D), and based on the detected coordinate data, detects the four dummy pins (19A) of the spring welding machine (13). After the positioning of (19), (19B), (19C), and (19D), the spring (6) is welded to the color selection electrode (1).

[Action]

In the present invention, one reference plane is formed by the first, second, and third panel pins (3A), (3B), and (3C), and the second and third pins facing each other in the reference plane are formed. With the intersection (O) of the X axis connecting (3B) and (3C) and the Y axis orthogonal to the X axis at the midpoint between the second and third panel pins (3B) and (3C) as the origin, , The second, third, and fourth panel pins (3A), (3B), (3C), and (3D) are detected, so that the first to fourth panel pins (3A) to (3D) are detected.
Is accurately detected (seven coordinate data).

Based on the coordinate data, four pins (3A) to (3A)
Since the relative positional relationship of D) is reproduced on the four dummy pins (19A) to (19D) of the spring welding machine (13) and the spring (6) is welded, the first to fourth springs (6A) to (6D) is the first to fourth panel pins (3A) to (3
It is welded to the position corresponding to D) with high precision. Moreover, since the welding of the spring (6) is performed on a welding machine (13) arranged at a place different from the panel (2), automation is possible. In addition, it is possible to prevent the inner surface of the panel from being damaged, and to prevent dust such as welding splash from adhering to the panel.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this example, as shown in FIG. 2, a panel pin position measuring device (11) for measuring a relative position of four pins (3) provided on inner walls of four sides of the panel (2), and a numerical processing means (12), a spring welding machine (13) for welding the spring (6) to the color selection electrode (1), and a spring position measuring machine (14) for measuring the spring position after welding is completed
The numerical data processing means (12) processes the measured data of the four pins measured by the panel pin position measuring device (11), and the dummy pin corresponding to the panel pin (3) of the spring welding machine (13) by the numerical processing data. The position of (19) is controlled, the spring (6) is fitted to this dummy pin (19), the other end of the spring is welded to the color selection electrode (1), and then welded by the spring position measuring machine (14). And a mechanism for correcting the panel pin position measurement data by measuring the spring position (ie, occurrence of an error or the like due to welding) and feeding back the measured data to the numerical processing means (12) again.

In the panel pin position measuring device (11), as shown in FIG. 2, the first, second and third pins (3A) of the panel (2),
In the plane formed by (3B) and (3C), the second
And a straight line (the reference axis) (X) connecting the third and third pins (3B) and (3C) and the middle point at right angles (ie, between the second and third pins (3B) and (3C)). With the intersection (O) of a straight line (Y) orthogonal to the straight line (X) at the middle point as the origin, the distances and deviation amounts Ax ₁ , Ay ₁ , Bx ₁ , Cx ₁ , Dx _{1 of} each pin (3) , Dy ₁ ,
Measure Dz ₁ . Ax ₁ is the straight line (Y) with the axis of the first pin (3A)
Ay ₁ is the distance between the spring contact line (described later) of the first pin (3A) and the straight line (X), and Bx ₁ is the intersection (distribution center described later) (O) and the second pin (3B) Cx ₁ is the distance between the intersection (O) and the third pin (3
C) Distance between the spring contact lines, Dx ₁ is the amount of deviation between the axis of the fourth pin (3D) and the straight line (Y), Dy ₁ is the straight line (X)
And the distance between the spring contact line of the 4th pin (3D) and Dz
₁ is the first, second and third pins (3A), (3B) and (3
This is the amount of deviation in the Z-axis direction from the plane (16) formed in (C).

As shown in FIG. 4, the panel pin position measuring device (11)
Four pin chucks (17) [(17) that fit into the four pins (3A), (3B), (3C) and (3D) of the panel (2), respectively.
(A), (17B), (17C), and (17D)], which are not shown but have a magnescale for measuring the position of each pin. Among the pin chucks (17), the pin chucks (17B) and (17C) corresponding to the second and third pins (3B) and (3C) are distributed from the center (O) by an equal distance to the left and right in the X-axis direction. A pin chuck (17A) attached to the means and corresponding to the other first pin (3A) is arranged so as to be freely movable in the X-axis direction and the Y-axis direction, and is further attached to the fourth pin (3D). The corresponding pin chuck (17D) is X
It is arranged so that it can move freely in each direction of the axis, the Y axis and the Z axis. The panel pin position measuring device (11) measures a number related to the distance (so-called grill height) to the panel inner surface (fluorescent surface) when the color selection electrode (1) is mounted on the panel (2). Measuring element.

As shown in FIG. 5, the pin chuck (17) has a line contact with a contact line (18) which engages with the pin (3) of the panel with the engagement hole (5) of the spring (6). Is done. The chuck portion is formed parallel to the pin (3) (in the example shown) or in a reverse taper.

As shown in FIG. 6, the spring welding machine (13) has four dummy pins (19) [() corresponding to the panel pins (3A), (3B), (3C) and (3D), corresponding to the pins. 19A), (19
B), (19C) and (19D)], and the positions of these dummy pins (19) are controlled based on processing data obtained by numerically processing each measurement data of the pins. In this spring welding machine (13), the mounting height of the color selection electrode is set based on the measurement data relating to the grill height in the panel pin position measuring machine (11).

The spring position measuring machine (14) is a spring welding machine (1
The configuration is the same as 3). However, in this example, the dummy pin corresponding to the fourth pin (3D) is configured to be able to move freely in the X-axis direction and the Z-axis direction, and the Magnescale for measuring the shift amount in the X-axis direction and the Z-axis direction. Is provided, but it is also possible to configure so that the amount of deviation from the first to fourth dummy pins can be measured.

Next, the operation of the above configuration will be described. The panel (2) is set on the panel pin position measuring device (11), and first, the sorting means is operated to make the second and third pin chucks (17B).
And (17C) are fitted to the second and third pins (3B) and (3C) of the panel, then the first pin chuck (17A) is fitted to the first pin (3A), and The fourth pin chuck (17D) is fitted to the fourth pin (3D). And
The magnetic scale, to measure the position or seven values of _{Ax 1, Ay 1, Bx 1} , Cx 1, Dx 1, Dy 1 and Dz ₁ of each pin described above (3). The seven measurement data processed in the numerical processing means (12), on the basis of seven numerical processing data corresponding to the Ax ₁ ~Dz _1, each dummy pins of the spring welder (13) (19A), (19B) , (19C) and (19D) are controlled. A color selection electrode (1) is set on the spring welding machine (13), and its mounting height is also determined by the panel pin position measurement device (1).
It is set based on the grill height measurement data from 1). In this state, a spring (6) is fitted to each dummy pin (19) with its engaging hole (5) fitted, and in this state, a holder integrated with the other end and the color selection electrode (1), ie, the frame (9), To weld. After the welding is completed, the color selection electrode (1) is set on the spring position measuring machine (14), and here, the spring, in this example, the fourth spring (6D)
The position shifts Dsx ₀ and Dsz ₀ are measured.

Here, only seven measurement data Ax ₁ ~Dz ₁ in panel pin position measuring device (11) is difficult to weld in the correct position by the spring welder (13). This is because the error is caused by the habit of the spring welding machine (13) itself or other factors. Therefore, the spring position measuring machine (1
In particular, the position of the fourth spring (6D) is measured by 4), and the measured data Dsx ₀ and Dsz ₀ are fed back to the numerical processing means (12). Processing data Ax ₂ , Ay ₂ , Bx ₂ , Cx ₂ , Dx ₂ , Dy ₂ and Dz ₂ are obtained.

Thus, initial conditions are set, and thereafter, the spring (6) is welded to the color selection electrode (1) to be married for each panel. That is,
As shown in Fig. 1, four pins (3A), (3B), (3C) and (3D) of the panel are measured by the panel pin position measuring device (11).
Are measured, and the measured data Ax ₁ , Ay ₁ , Bx ₁ , Cx
₁ , Dx ₁ , Dy ₁ and Dz ₁ are processed by the numerical processing means (12),
Numerically processed data Ax ₂ , Ay ₂ , Bx considering the correction term
₂ , Cx ₂ , Dx ₂ , Dy ₂ and Dz ₂ , as shown in FIGS. 3A and 3B, four dummy pins (19) of the spring welding machine (13).
A), (19B), (19C) and (19D) are positioned,
In this spring welding machine (13), the spring (6) and the color selection electrode (1) are welded in the same manner as described above. Here, as the welding of the spring (6) and the color selection electrode (1), four springs (6A) to (6D) may be simultaneously welded to the color selection electrode (1). Also, a spring welding machine (1
After the position of the dummy pin is controlled in 3), a plurality of, for example, second and third springs (6B) and (6C), or first, second and third springs (6A), (6B) and ( 6C) is set on the spring welder (13) such that the welded spring (6) is fitted to the corresponding dummy pin (19),
Only the first and fourth springs (6A) and (6D) or the fourth spring (6D) are fitted to the corresponding dummy pins (19A) and (19D) or (19D) and welded. You may.

In FIG. 3, the positioning of the dummy pin (6) of the spring welding machine (11) is adjusted so as to correspond to the measured data of the panel pin by the second and third dummy pins (19B) and (19C).
The intersection (O) of the straight line (X) connecting the two and the straight line (Y) at the center thereof is set as the origin.
As shown in FIG. 7, each dummy pin (19A) is set so that the position of the first dummy pin (19A) becomes the origin (Ax ₂ = 0).
~ (19D) can also be positioned.

In this case, the measurement data of the panel pin is written as A _X3 ← 0 A _Y3 ← A _Y1 B _X3 ← (B _X1 −A _X1 ) C _X3 ← (C _X1 −A _X1 ) D _X3 ← (D _X1 −A _X1 ) C _Y3 ← D _Y1 D _Z3 ← D _Translate in parallel like _Z1 and numerically processed data Ay ₃ , Bx ₃ Cx ₃ , Dx ₃ , D
controlling each dummy pins (19) on the basis of y ₃ and Dz _3.
In this case, the first dummy pin (19
Since A) is not moved, the cause of the error is reduced by one.

On the other hand, even after the initial conditions are set as described above, in consideration of a case where the spring welding position deviates from an allowable range in the actual production line for some reason, after the spring welding is completed, the color selection is performed. The electrodes (1) are sent one by one or an appropriate number to the spring position measuring device (14), the spring position is measured, and the measured data (Dsx ₀ , Dsz ₀ )
Is fed back to the numerical processing means (12), so that the previous correction term can be further corrected.

Table 1 below shows a comparison between the accuracy of the spring welding method of the present invention and the accuracy of the conventional spring welding method.

The evaluation was performed on a 25-inch type color cathode ray tube. In particular, when the color selection electrode after the spring welding was fitted to the four pins of the panel using a machine, the fourth spring was the first to the panel pin. The measurement was performed by measuring the moving distance from the fitting position to the stable position. The test takes the average value of each of the 20 samples and represents the logarithm of the conventional method as 100.

According to Table 1, in the case of the method of the present invention, the value of the moving distance of the fourth spring is smaller than that of the conventional method, and the fitting state of the second and third springs to the pins is good. Yes, it is recognized that the spring can be welded with high precision.

In the method of the present invention, the first, second, third and fourth springs are simultaneously welded to the first and second springs.
And the third spring is welded simultaneously, and then the fourth spring is welded.

According to the above-described embodiment, the positions of the four pins (3) of the panel (2) are measured, and the four dummy pins (19) of the spring welding machine (13) arranged at a location different from the panel.
Is controlled by the numerical processing data based on the measurement data, that is, the numerical processing data in consideration of the correction term, and is reproduced so as to have the same relative positional relationship as the panel pin (3). The selection electrode (1) and the spring (6) are welded.

For this reason, the four springs (6) can be welded to the color selection electrode (1) with high accuracy, and since they are not welded in the panel as in the conventional case, an automatic system line can be formed, and the color selection electrode can be formed. This enables mass production of (1). In addition, there is no need for a machine for attaching and detaching the color selection electrode (1) to and from the panel (2), a removal machine, and a reversing machine, so that a production line can be easily assembled. Also, since there is no need to insert a welding gun into the panel (2), there is no damage to the panel surface, and no dust adheres to the panel (2) due to welding splash or the like, thereby improving the reliability of the panel (2). I do.

Furthermore, the processing time required for spring welding can be reduced to about 1/6 compared to the conventional method. When measuring the position of the panel pin, the second and third pins (3B) and (3C)
X-axis direction displacement amount Ax ₁ of the first and fourth pins of the straight line (Y) perpendicular thereto at its midpoint as a reference axis a straight line (X) connecting (3A) and (3D), Dx ₁ Are measured on the corresponding magnescales, so the deviation amounts Ax ₁ and Dx ₁ are small, and the controllability and reproducibility of measurement are good.
Measurement can be performed with high accuracy, and the measurement process can be performed quickly.

〔The invention's effect〕

According to the present invention, four springs in a four-pin support system can be welded to a color selection electrode with high accuracy, and the spring welding can be automated. Therefore, it is possible to enhance the mass productivity of a high quality color selection electrode.

Also, since the intersection point between the X axis connecting the second and third panel pins and the Y axis orthogonal to the X axis at the midpoint between the second and third panel pins is used as the origin, the left and right moving distance can be easily obtained. Become.

In addition, the distance between the inner surface of the panel and the electrode surface of the color selection electrode based on the plane formed by three panel pins,
A so-called grill height is set. In the present invention, a reference plane is formed by three panel pins, the dummy pins of the spring welding machine are positioned based on the coordinate data of each panel pin, and spring welding is performed. As a result, the grill height is set accurately. be able to.

In addition, damage to the inside of the panel and adhesion of dust to the panel due to welding splash and the like as in the past can be avoided,
The quality as a color cathode ray tube can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a spring welding method according to the present invention. FIGS. 2A and 2B are plan views and cross-sectional views showing measurement data of pin positions in a panel pin position measuring machine according to the present invention. FIG. 4 is a plan view and a sectional view showing an example of control of a dummy pin position in a spring welding machine according to the present invention.
FIG. 5 is a perspective view showing a pin chuck portion of the panel pin position measuring device, FIG. 5 is a sectional view showing a fitted state of the pin chuck and the pin, FIG. 6 is a perspective view showing a dummy pin portion of the spring welding machine, and FIG. 7A and B are a plan view and a sectional view showing another example of the control of the position of the dummy pin in the spring welding machine according to the present invention, and FIG. 8 is a plan view showing a state in which a 4-pin support type color selection electrode is supported on a panel. It is. (1) is a color selection electrode, (2) is a panel, (3A) to (3D)
Is a pin, (5) is an engagement hole, (6A) to (6D) is a spring, (17A) to (17D) is a pin chuck, and (19A) to (19)
D) is a dummy pin.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinya Yamazaki, 30 Inazawa, Izawa, Inazawa, Aichi Prefecture Inside Sony Inazawa Co., Ltd. 56) References JP-A-54-154264 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 9/14 H01J 9/22 H01J 29/02

Claims (1)

(57) [Claims] 1. A method of manufacturing a color cathode ray tube, wherein one panel pin for attaching a color selection electrode is provided on each of four inner side walls of the panel, wherein the first, second and fourth panel pins are provided. Third three
One reference plane is formed by the panel pins, and in the reference plane, an X axis connecting the second and third panel pins facing each other, and an X axis at a midpoint between the second and third panel pins. The coordinate data of the first, second, third, and fourth panel pins is detected with the intersection point with the orthogonal Y axis as the origin, and the four points of the spring welding machine are detected based on the detected coordinate data.
A method of manufacturing a color cathode ray tube, comprising: positioning a dummy pin; and welding a spring to a color selection electrode.