JPH04289635A - Frame for color selection electrode of in color cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide a frame structure capable of equalizing the tension distribution of a grid all over its surface so as to suppress the degradation of color parity due to the vibration of a color screening electrode of grid wiring and stretching type being used in a color cathode-ray tube. CONSTITUTION:A supporting rod 21 for mounting an aperture which acts as a grid, and a resilient supporting body 22 for supplying a force which generates a tension on the supporting rod are fixed with a connecting pin 23 and a plate spring 24. Since the supporting rod 21 and the resilient supporting body 22 are rotatable about the connecting pin 23, the angle change of the connecting part accomplished by the deformation of the resilient supporting body due to pressure transmits to bending moment to the supporting rod, so that an uniform deflection Can be assured all over its surface and the tension distribution of the grid can be equalized.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to the structure of a frame used in a color selection electrode assembly in a color cathode ray tube.

0002

[Prior Art] In a general color cathode ray tube, a color selection electrode structure 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 structures for this color selection electrode structure, one of which is a structure in which a so-called aperture grill in which many slit-like pores are formed is stretched by an elastic frame.

As shown in FIG. 5, this stretched color selection electrode structure includes a pair of opposing support rods 21 and a pair of elastic supports 2 installed across the pair of support rods.
The aperture grille 1 has a frame 2 consisting of two parts, and an aperture grille 1 is stretched across the end faces of the pair of opposing support rods 21 on the side facing the fluorescent screen. A support structure consisting of a clip 3 and a spring 4 is attached to the frame 2, and a fitting hole 41 provided in the spring 4 is attached to the frame 2.
It is attached to a panel pin (not shown) embedded in the inner surface of the panel.

This aperture grill 1 has a large number of slits arranged in one direction at predetermined intervals in a thin metal plate by, for example, chemical etching, and both ends of the slits in the extending direction are welded to the support rod 21 of the frame 2. be done. At this time, the frame 2 is held with the support rods 21 bent inward, and after welding the aperture grille 1, the frame 2 is
By releasing the holding, a predetermined tension is generated in the aperture grille 1 due to a reaction force.

Support rod 21 and elastic support 22 of frame 2
are fixed by welding, and some are fixed near the Bessel point of the support rod 21, some are fixed at the ends, and some are fixed between the two. Those fixed near the Bessel point and those fixed between the Bessel point and the end are bent toward the end of the support rod 21 as shown in FIG. 5 so as not to obstruct the trajectory of the electron beam. The elastic support body 22 has a similar structure.

[0006]

[Problems to be Solved by the Invention] Since the conventional frame 2 has the support rod 21 and the elastic support 22 fixed as described above, it is necessary to fix the elastic support 22 in order to bend the support rod 21 inward. When the support rod 21 is deformed under pressure, force also acts on the support rod 21 and a bending moment is generated, so the amount of deflection is large at the center of the support rod 21 and small at the ends, as shown in Figure 6. turn into.

When the amount of deflection varies greatly as shown in FIG. 6, it is difficult to equalize the distribution of tension generated in the aperture grille. As shown in the figure, the tension is low at the center and the ends, and high at the connection between the support rod 21 and the elastic support 22, and the minimum tension is approximately 20% of the maximum tension.

1 of the aperture grill when the tension is low.
The resonant frequency of a single string decreases, the string shakes greatly due to external vibrations, the slit hole is displaced, and the positional relationship between the slit hole and the predetermined phosphor is disrupted.
This appears as a deterioration in color purity on a color cathode ray tube screen.

As a countermeasure to this problem, it is desirable to increase the minimum tension, and even if the conventional method has a tension distribution as shown in FIG. 7, it is possible to increase the minimum tension by increasing the overall tension. However, in this case, the stress applied to the frame is extremely high, and the stress generated in the strings where the tension distribution of the aperture grill is high is also high, and in order to satisfy this stress, expensive materials must be used. It won't happen. The best way to increase the minimum tension using conventional materials is to make the tension distribution uniform.

Originally, it is the support rod 21 that supports at the Bessel point.
The purpose is to minimize the amount of deformation and equalize the amount of deflection. However, as described above, a bending moment occurs between the support rod 21 and the elastic support body 22, and as a result, the support rod 21 is largely deformed, making it impossible to equalize the amount of deflection.

This invention has been made to solve the above-mentioned problems of the present invention, and an object of the present invention is to obtain a color-selecting electrode structure capable of providing an aperture grill with uniform tension distribution.

0012

[Means for Solving the Problems] The frame for color sorting electrodes of color cathode ray tubes according to the present invention does not integrate the support rod and the elastic support, and has a structure in which the support rod is not subjected to bending moment from the elastic support. It is a combination of both.

[0013]

[Function] The frame for color sorting electrodes of color cathode ray tubes according to the present invention has a structure in which the connecting portion is rotatable so that the force from the elastic support for generating tension is transferred to the support rod to which the aperture grill is attached. Therefore, it acts as a concentrated load and does not act as a bending moment. Therefore, it is possible to ensure a substantially uniform amount of deflection over the entire area during stretching, and it is easy to provide an aperture grill with uniform tension distribution.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 21 is a support rod to which an aperture grill is attached, 22 is an elastic support, and 23 is a support rod 21.
A connecting pin 24 is a leaf spring for applying pressure to the connecting pin 23. The connecting pin 23 is a stripper bolt whose tip is threaded, and the support rod 21 is provided with a corresponding threaded hole. Furthermore, a reamed hole is machined in the elastic support body 22 through which a connecting pin 23 passes.

Before the aperture grill is installed, the frame 2 is pressurized at four points on the side walls of the elastic support by a pressurizer, and the support rod is displaced from the position shown by the solid line to the position shown by the broken line as shown in FIG. At this time, since the support rod 21 and the elastic support body 22 are not fixed, the support rod 21 is displaced to the position indicated by the broken line without being deformed.

Next, the connecting pin 23 is lightly screwed into the support rod 21. In this state, the aperture grill is placed along the support rod 21 and fixed by welding. Next, the pressure applied to the elastic support 22 is gradually released, and when the pressure becomes zero, the connecting pin 23 is strongly screwed into the support 22 to fix the support rod 21 and the elastic support 22. In this state, the support rod 21 and the elastic support body 22 are taken out from the stretching machine and the contact portions of the support rod 21 and the elastic support body 22 are welded at several places to be completely fixed.

The tension distribution of the aperture grill of the 23-inch CRT stretched using the above method is as shown in FIG.
The minimum tension rose to about 80% of the maximum tension. As a result, the resonant frequency at the center of the CRT screen, which was currently a problem, has increased from 140Hz to 24OHZ, and the time during which vibration of the aperture grill is observed on the CRT screen (damping time) when a blow impact is applied to the CRT. However, the time that used to be over 5 seconds has been reduced to less than 1 second, which is now at a level where there is no problem.

As another embodiment, a support rod and an elastic support body may be fitted into each other as shown in FIG. 4. A fitting convex portion 221 is formed by machining on the elastic support body 22, and a fitting concave portion 21 is formed on the support rod 21 correspondingly.
1 is formed by machining. The fitting protrusion 221 of the elastic support 22 is machined by calculating in advance the angular change of the fitting part due to processing so that it fits with the fitting recess 211 of the support rod 21 in a pressurized and deformed state.

First, the elastic support 22 is pressurized to a predetermined position, and in this state, the support rod 21 is fitted into the elastic support. In this state, the support rod is simply fitted, so it is attached without deformation. Thereafter, the aperture grill is welded to the support rod in the same manner as in the previous embodiment, the pressure on the elastic support is released, and the support rod and the elastic support are welded at several locations.

Furthermore, in the first embodiment described above, the connecting pin 2
Although the support rod 21 and the elastic support body 22 were connected in 3, the same effect can be obtained by drilling a hole in either the support rod 22 or the elastic support body 23 and directly fitting them with a pin in the other. There is.

[0021]

As described above, according to the present invention, since the bending moment from the elastic support is not transmitted to the support rod, it is possible to generate a uniform tension over the entire area. The vibration characteristics of color cathode ray tubes can be improved without using particularly high-grade materials with high resistance.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a color sorting frame for color cathode ray tubes according to an embodiment of the present invention.

FIG. 2 is a top view showing the deformed state of the color cathode ray tube color sorting frame according to the present invention when it is deformed under pressure; the solid line shows the state before the pressure is applied, and the broken line shows the state when the pressure is applied.

FIG. 3 is a diagram showing the tension distribution of an aperture grill manufactured using the color cathode ray tube color sorting frame according to the present invention.

FIG. 4 is a perspective view showing a color sorting frame for color cathode ray tubes according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a color sorting structure using a conventional color cathode ray tube color sorting frame.

FIG. 6 is a diagram showing the amount of displacement of a support rod when a conventional color cathode ray tube color sorting frame is deformed under pressure.

FIG. 7 is a diagram showing the tension distribution of an aperture grill manufactured using a conventional color cathode ray tube color sorting frame.

[Explanation of symbols]

1 Aperture grill 2 Frame 21 Support rod 211 Fitting recess 22 Elastic support 221 Fitting convex part 23 Connecting pin 24 Leaf spring 3 Clip 4 Spring 41 Spring fitting hole

Claims (2)

[Claims] 1. In a color selection electrode structure in which a color selection electrode made up of a large number of grid elements arranged at a predetermined pitch is stretched over a frame, the frame is provided with opposing electrodes to which the color selection electrodes are attached. It consists of a pair of support rods and a pair of elastic supports attached between the support rods, and the support rods are connected to the elastic supports in a structure in which no bending moment is applied to the elastic supports. A frame for color selection electrodes for color cathode ray tubes. 2. The collar according to claim 1, wherein the support rod and the elastic support are connected by a connecting pin, and both are rotatable around the connecting pin. Frame for cathode ray tube color selection electrodes.