JPH11111188A - Color cathode ray tube and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and firmly install the elastic supporting body in an approximately triangular frame additionally installed with a reinforcing side part and to correct the dispersion of panels and set q-value with high precision in installing a color selecting electrode structure body in a panel. SOLUTION: A hole 8 is formed near the center of a reinforcing side part 3c of a frame 3 and while an elastic supporting body 4 is fitted in a panel pin 6, a color selecting electrode structure body 1 is installed in a panel 5. After a color selecting electrode structure body 1 is moved while the positioning relation between the panel inner face and the color selecting electrode 2 being measured, an electrode rod for resistance welding is inserted through the hole 8 formed in the reinforcing side part, and the elastic supporting body 4 is spot welded with the color selecting electrode structure body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube used for televisions and displays, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In general, a color selection electrode structure of a color cathode ray tube has a shadow mask type in which a color selection electrode having a large number of apertures is formed on a predetermined curved surface by press working and then fixed by welding to a frame. There are two types of a tension mask method in which a color selection electrode having a large number of apertures or slits formed by a large number of strips is welded and fixed to a frame in a state where tension is applied.

As shown in FIG. 5, a color selection electrode assembly 1 of a shadow mask type usually has a color selection electrode 2 having a large number of apertures arranged and formed into a predetermined curved shape, and a color selection electrode structure 1 as shown in FIG. A frame 3 having a substantially L-shaped side wall 3a extending in a direction perpendicular to the frame 2 and a back surface 3b parallel to the color selection electrode 2, one end fixed to the frame 3, and the other end fitted to a panel pin. And an elastic support 4.

In the shadow mask type color selection electrode assembly 1, an elastic support 4 positioned by using a predetermined jig is generally fixed to a frame 3 by welding, and then the elastic support 4 is welded. It is assembled by positioning the color selection electrode 2 on the frame 3 by using a predetermined jig and fixing it by welding. Normally, resistance welding that has high welding strength and can be easily performed is used for welding the frame 3 to the elastic support 4 and for welding the frame 3 to the color selection electrode 2.

On the other hand, as shown in FIG. 6, a color selection electrode assembly 1 of a tension mask type usually has a color selection electrode 2 having a large number of apertures or slits formed by a large number of strips. And a side wall 3 formed substantially in an L-shape, as described in Japanese Patent Application Laid-Open No.
a frame 3 formed in a substantially triangular frame shape by additionally installing a reinforcing side portion 3c between the a and the rear portion 3b so as to withstand the tension of the color selection electrode 2, and one end fixed to the frame 3 The elastic support 4 has an end fitted to the panel pin 6.

In general, the tension mask type color selection electrode assembly 1 is obtained by deforming the frame 3 under pressure.
After welding and fixing the color selection electrode 2 to the frame 3, tension is applied to the color selection electrode 2 by releasing the pressurization of the frame 3. After that, the frame 3 on which the color selection electrode 2 is stretched
Then, the elastic support 4 positioned using a predetermined jig is fixed by welding.

However, in the case of a frame in which a reinforcing side is additionally provided between a side wall and a back side as described in Japanese Patent Application Laid-Open No. 7-296938, the electrode rod inside the resistance welding is connected to the reinforcing side. Therefore, the elastic support cannot be attached by resistance welding. Therefore, for example, Japanese Patent Application Laid-Open No.
As described in JP-A-92-92, welding of an elastic support by a YAG laser is generally performed.

In the case of the shadow mask method or the tension mask method, the distance between the inner surface of the panel and the color selection electrode is important when the color selection electrode assembly is mounted on the panel. This distance is usually q
If this q value deviates from the design value,
The tolerance before the electron beam causes a phosphor other than the predetermined phosphor to emit light is reduced, and when the positional relationship between the electron beam and the phosphor is displaced for some reason, the other phosphor is caused to emit light. As a result, color purity or color reproducibility, which is an important characteristic of the color cathode ray tube, deteriorates. Therefore, quality control of the q value is very important.

[0009]

However, the shadow mask method and the tension mask method do not
The color selection electrode assembly is assembled in a state where it is positioned with respect to the standard panel using a jig, and then attached to each of the use panels. For this reason, in general, the deviation between the used panel and the assembly jig and the deviation from the design value of the assembly jig caused by the dispersion of the panel at this time are ignored, and the individual dispersion cannot be corrected for each panel. .

On the other hand, in a substantially triangular frame additionally provided with reinforcing sides as disclosed in Japanese Patent Application Laid-Open No. Hei 7-2976738, which is mainly used for a tension mask method, welding of an elastic support is performed. JP-A-5-547
Although a YAG laser as disclosed in Japanese Patent Application Publication No. 92-92 is used, the YAG laser generally has lower welding strength than resistance welding and has a large variation in intensity depending on the focal length. In a remarkable case, the welded elastic support comes off the frame and cannot hold the color selection electrode assembly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a stable elastic support can be mounted by resistance welding even in a substantially triangular frame to which a reinforcing side is additionally provided. It is an object of the present invention to provide a color cathode ray tube capable of correcting variations in panels and improving q-value accuracy when a selection electrode assembly is attached to a panel, and a method of manufacturing the same.

[0012]

In order to achieve the above object, a color cathode ray tube according to the present invention comprises a panel on which a phosphor screen is formed, and a plurality of apertures arranged in close proximity to the phosphor screen. In the color cathode ray tube, comprising a color selection electrode in which is arranged, and a frame for fixedly holding the color selection electrode, wherein the frame is locked to a panel pin implanted in the panel via an elastic support. The frame has a reinforcing side between a substantially L-shaped side wall and a rear side, and a hole for welding means insertion is provided in the reinforcing side to maintain a stress balance of the color selection electrode. (Claim 1).

According to this structure, in the substantially triangular frame to which the reinforcing side is additionally provided, the elastic support can be mounted by resistance welding using the holes for inserting the welding means. It is excellent in strength and can easily attach the elastic support. In addition, by providing the holes for inserting the welding means so as to maintain the stress balance of the color selection electrode, particularly in the tension mask type color selection electrode, the tension balance is not broken and the color selection electrode is not wrinkled.

It is preferable that one hole of the reinforcing side is provided at a central portion of the reinforcing side.

It is preferable that one hole of the reinforcing side is provided at a position symmetrical with respect to a line bisecting a long side of the reinforcing piece (claim 3).

According to these configurations, the color selection electrodes can be stretched over the frame without breaking the tension balance in the tension mask type color selection electrode assembly.

The method of manufacturing a color cathode ray tube according to the present invention comprises the steps of: forming a panel on which a phosphor screen is formed; a color selection electrode having a large number of apertures arranged in close proximity to the phosphor screen; A frame for fixing and holding the color selection electrode, wherein the frame is locked via a resilient support to a panel pin implanted in the panel, and the frame has a substantially L-shaped side wall portion; A method for manufacturing a color cathode ray tube having a reinforcing side portion between the back side and the reinforcing side portion, wherein a hole is provided near the center thereof, wherein the panel pin is implanted in the panel. After the elastic support is fitted, a color selection electrode structure in which the color selection electrodes are fixedly held on the frame is disposed in the panel, and a predetermined distance is measured while measuring the distance between the panel and the color selection electrode structure. Up to the position Moving the selecting electrode assembly, in which by inserting the welding means into a hole provided in said reinforcing side section is fixed by welding and the color selection electrode structure and the resilient support (claim 4).

According to this manufacturing method, it is possible to fix the color selection electrode assembly at a predetermined position for each panel while measuring the positional relationship between the panel inner surface and the color selection electrode. The distance from the color selection electrode, that is, the q value can be accurately set.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to embodiments.

(Embodiment 1) FIG. 1 is a sectional view of a panel portion of a color cathode ray tube according to the present invention.

As shown in FIG. 1, the color cathode ray tube of the present embodiment is a general tension mask type color cathode ray tube, and includes a panel 5 having a phosphor screen 7 formed on an inner surface thereof and an elastic support 4. And a color selection electrode structure 1 supported on the panel 5 by the color filter.

The color selection electrode assembly 1 includes a phosphor screen 7
A color selection electrode 2 in which a large number of apertures or slit-like pores formed by a large number of strips are arranged in close proximity to each other;
A frame 3 for fixedly holding the color selection electrode 2.

An elastic support 4 is fixed to the frame 3 by welding near the center of the four sides. A tapered panel pin 6 is implanted on the inner surface of the panel 5 at a position corresponding to the elastic support 4 of the frame 3. The frame 3 is held by the panel 5 by locking the holes of the elastic support 4 to the panel pins 6.

FIG. 2 is a partially cutaway perspective view of the color selection electrode assembly 1. As shown in FIG. 1 and FIG.
Is a side wall portion 3a and a rear portion 3 which are combined in a substantially L-shape.
b, a reinforcing side 3c is provided. In a state where the compressive force is applied to the frame 3 to bend, the tensioned color selection electrode 2 is fixed to the upper surface of the frame 3 by welding, and then the compressive force applied to the frame 3 is released. A predetermined tension is applied to the color selection electrode 2.

An example of the color selection electrode assembly 1 will be described below. 3
In the case of a 2-inch tension mask type color cathode ray tube, the color selection electrode 2 is made of a steel plate having a plate thickness of 0.025 [mm], and is made of a stainless steel plate with a tension of about 10 [kg / cm ² ]. It is fixed and held on a frame 3 of 0.0 mm.

The reinforcing side 3c of the frame 3 has a thickness of 2.0.
[Mm] stainless steel plate. In the vicinity of the center of each reinforcing side, the height direction is 26 [mm], left and right at positions symmetrical with respect to a line bisecting the long side (a bisector of the base of the trapezoidal reinforcing piece), A total of eight rectangular holes 8 each having a width of 29 [mm] are provided. One of the two holes 8 provided in each reinforcing side 3c corresponds to a position where the elastic support 4 is fixed, and the other corresponds to a line bisecting the long side of the reinforcing side 3c. It is provided at a position symmetrical to the hole.

The elastic support 4 has a plate thickness of 1.2 [mm].
And an invar alloy (iron-3) having a shape extending in the lateral direction.
6% nickel) and a stainless steel bimetal material, and is attached to the frame 3 through one of the holes 8 provided in the reinforcing side portion 3c as shown in FIG. Is inserted, the side wall 3a of the frame 3 and the elastic support 4 are sandwiched between the outer welding electrodes 10, and the three portions are fixed by spot welding.

In the conventional welding of an elastic support by a YAG laser, the maximum load at which the elastic support peels off from the frame in a tensile test was limited to 200 kg, whereas in the resistance welding according to the present embodiment, 1000 [kg]
Even when the above load is applied, the elastic support does not peel off.

Thus, even in a substantially triangular frame to which the reinforcing side is additionally provided, the elastic support can be firmly and easily mounted by resistance welding similarly to the L-shaped frame having no reinforcing side. be able to.

The reason why another hole is provided at a position symmetrical to the hole for welding the elastic support is as follows. In the case of an elastic support having a shape extending in the lateral direction, the position where the elastic support is fixed is usually displaced from the center of each side of the frame. If one hole is not provided, when tension is applied to the color selection electrode, the tension balance is lost and the color selection electrode cannot be stretched with a predetermined tension.
Wrinkles appear on the color selection electrode. By providing the holes in the reinforcing piece symmetrically, the tension balance of the color selection electrode is maintained.

The same configuration may be applied to the case where the elastic support is provided not on each of the four sides of the frame as in the above-described embodiment but on each of the three sides of the frame. That is, if the same symmetrical hole as the one side on the opposite side is also provided on one side where the elastic support is not provided, the tension balance of the color selection electrode can be maintained.

Further, in order to maintain the rigidity of the frame, it is preferable that the hole provided in the reinforcing side portion has a minimum size in which a welding electrode rod is inserted and welding of the elastic support can be performed without any trouble. The shape is not limited to a rectangle, and may be, for example, a circle, a trapezoid, or a triangle.

Although the present embodiment has been described by taking as an example a case of a color cathode ray tube of a 32 inch tension mask system using an elastic support having a shape extending in the lateral direction, the present invention is not necessarily limited to this. The present invention is not limited to this. A color cathode wire having a color selection electrode assembly 1 for welding and fixing an elastic support 4 having a substantially U-shaped cross section as shown in FIG. It can also be applied to tubes.

In this case, the hole 8 in the reinforcing side of the frame
Also, since it is provided substantially at the center corresponding to the position of the elastic support body 4, it is not necessary to provide another hole for maintaining the tension balance as described in the above embodiment, and the hole at the reinforcing side portion is provided. It is only necessary to provide a total of four 8s, one at the approximate center of each side.

(Embodiment 2) Next, a method of manufacturing a color cathode ray tube according to the present invention will be described with reference to FIG.

First, the panel pins 6 planted on the panel 5
The hole 12 of the elastic support 4 is fitted to the hole. Then, the color selection electrode assembly 1 in which the color selection electrodes 2 are stretched over the frame 3 is inserted into the panel 5.

Next, the color selection electrode assembly 1 is moved to a predetermined position while measuring the distance between the inner surface of the panel 5 and the color selection electrode 2. For the measurement, for example, an optical method of irradiating light from the surface of the panel 5, measuring the reflection time and the amount of reflected light from each of the inner surface of the panel 5 and the color selection electrode 2, and calculating the distance is used.

Then, the elastic support 4 and the side wall 3a of the frame 3 are brought into close contact with each other, and in this state, the welding electrode rod 9 inside the resistance welding machine is removed from the hole 8 provided in the reinforcing side 3c of the frame 3. The elastic support 4 and the frame 3 are sandwiched by the outer electrode 10 and fixed at three locations by spot welding.

At this time, a protective cover 11 is additionally provided along the reinforcing side portion 3c on the inner welding electrode rod 9, so that spatter during welding can be prevented from scattering to the color selection electrode 2. it can.

Generally, in the case of a 32-inch tension mask type color cathode ray tube, the set value of the q value is about 12 [m
m]. In the conventional method, the frame and the elastic support were welded to each other with the jig being used to assemble the frame and the elastic support to assemble the color selection electrode assembly, and then attached to each panel used. Since the variation cannot be corrected for each panel, the variation of the q value was about ± 0.30 [mm].

On the other hand, in the manufacturing method according to the present embodiment, all the elastic supports and the color selection electrode assembly can be assembled in an optimum state while directly measuring the q value for each panel. Variations in the q value of each panel can be absorbed, and as a result, the variation in the q value can be suppressed to about 0.15 [mm], which is about half the conventional value. Accordingly, it is possible to sufficiently secure a margin until the electron beam causes a phosphor other than the predetermined phosphor to emit light.

As described above, according to the method for manufacturing a color cathode ray tube of the present invention, a frame is provided with a reinforcing piece,
It is particularly suitable for the production of a tension mask type color cathode ray tube in which the color selection electrodes are flat and the alignment of the color selection electrode structure and the panel can be relatively easily performed. The present invention can be similarly applied to color cathode ray tubes for televisions and display color cathode ray tubes of all sizes including tubes.

[0043]

According to the color cathode ray tube and the method of manufacturing the same of the present invention, since the position can be set in a state where the color selection electrode assembly is incorporated in the panel, the variation of the q value for each panel can be individually corrected. In addition, since the positioning is performed by fixing the elastic support to the color selection electrode assembly by resistance welding, the q value can be set easily and accurately.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a color cathode ray tube of the present invention.

FIG. 2 is a partially cutaway perspective view of a color selection electrode assembly used in the color cathode ray tube of the present invention.

FIG. 3 is a diagram showing one step of the method for manufacturing a color cathode ray tube according to the present invention.

FIG. 4 is a partially cutaway perspective view of a color selection electrode assembly used in the color cathode ray tube of the present invention.

FIG. 5 is a partially cutaway perspective view of a color selection electrode assembly used in a conventional shadow mask type color cathode ray tube.

FIG. 6 is a partially cutaway perspective view of a color selection electrode assembly used in a conventional tension mask type color cathode ray tube.

[Explanation of symbols]

 1 color selection electrode structure 2 color selection electrode 3 frame 4 elastic support 5 panel 6 panel pin 7 phosphor screen 8 hole 9 welding electrode rod

Claims (4)

[Claims] 1. A panel on which a phosphor screen is formed, a color selection electrode having a large number of apertures arranged close to and opposed to the phosphor screen, and a frame for fixing and holding the color selection electrode. A color cathode ray tube in which the frame is locked via a resilient support to a panel pin implanted in the panel, wherein the frame has a substantially L-shaped side wall and a back surface. A color cathode ray tube having a reinforcing side portion therebetween, wherein a hole for inserting welding means is provided in the reinforcing side portion so as to maintain a stress balance of the color selection electrode. 2. The color cathode ray tube according to claim 1, wherein one hole of the reinforcing side portion is provided at a central portion of the reinforcing side portion. 3. The color cathode ray tube according to claim 1, wherein the holes of the reinforcing side portions are provided one by one at positions symmetrical with respect to a line bisecting a long side of the reinforcing piece portion. . 4. A panel on which a phosphor screen is formed, a color selection electrode having a large number of apertures arranged close to and opposed to the phosphor screen, and a frame for fixing and holding the color selection electrode. Wherein the frame is locked via a resilient support to a panel pin implanted in the panel, and the frame has a reinforcing side portion between a substantially L-shaped side wall portion and a rear portion. Having the reinforcing side portion,
A method of manufacturing a color cathode ray tube having a hole near the center thereof, wherein the color selection electrode is fixed to the frame after the elastic support is fitted to the panel pin implanted in the panel. The held color selection electrode assembly is arranged in the panel, and the color selection electrode assembly is moved to a predetermined position while measuring the distance between the panel and the color selection electrode assembly, and is provided on the reinforcing side. A method for manufacturing a color cathode ray tube, comprising: inserting welding means into a hole formed by welding to fix the elastic support and the color selection electrode assembly by welding.