JP2000315462A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate uneven streaks due to grille twisting by setting an extensive frequency small and to provide a color cathode-ray tube capable of converging a screen function early. SOLUTION: In this color cathode-ray tube, the end on the fixed side of a spring 6 is partitioned by a first bend part 61 and the end formed with a fit hole 60 is partitioned by a second bend part 62 that is bent in the direction opposed to the first bend part 61. In the middle area partitioned by the first and second bend parts 61 and 62, a rectangular flap 64 is formed by a U-shaped notch 63. The flap 64 is cut and erected at about 30 deg. in the direction opposed to the first bend part 61 along the line connecting the start and the end of the notch 63 and is bent in the middle at about 70 deg. in the same direction as the first bend part 61. The flap 64 thus formed is configured of a vibration suppressing mechanism in the middle area of the plate of a resilient support 6 by bringing the notch 63 into a point contact with two cut sides sectional face of the flap 64.

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 in which a color selection electrode is supported in a face panel by an elastic support.

[0002]

2. Description of the Related Art As a color selection electrode used in a color cathode ray tube, a so-called shadow mask type and an aperture grill type are known.

FIG. 3 is a perspective view showing the structure of an aperture grill type color selection electrode, and FIG. 4 is a perspective view showing a resilient support for elastically supporting a frame of the color selection electrode and a diagram showing a cross-sectional shape. .

In FIG. 3, a color selection electrode (hereinafter, referred to as an aperture grill 4) is held by a frame 1 at a predetermined position facing an inner surface of a face panel of a valve (not shown). The frame 1 includes first supports 2a and 2b (hereinafter, referred to as H members), and second supports 3a and 3b (hereinafter, referred to as H members) arranged in a vertical direction orthogonal to the H members 2a and 2b. V member). The H members 2a and 2b form curved surfaces corresponding to the horizontal screen curved surface of the face panel, and upper and lower edges of the aperture grill 4 are fixed to the respective curved surface portions.

[0005] The aperture grille 4 is obtained by subjecting a very low carbon steel to cold working and etching a thin sheet material having a tensile strength of about 70 to 80 [kg / mm ² ]. In this aperture grill 4, a plurality of vertically long slits 4a are formed between adjacent grills 4b,
It is arranged as a plurality of transmission holes for transmitting an electron beam emitted toward the face panel of the bulb.

5a is a spring holder for fixing the spring 6a to the H member 2a, and 5b is a V member 3
This is a spring holder for fixing the spring 6b to a. Each of the springs 6a and 6b is formed of a strip-shaped plate having a fitting hole 60 to be fitted to a panel pin, and one end is fixed to the spring holders 5a and 5b by welding or the like, as shown in FIG. The first and second bent portions 61 and 62 are formed at such positions and angles. By these bent portions 61 and 62, the plate body has a predetermined elastic force, and the fitting hole 60 formed at the other end that is not fixed is adjusted to the pin position of the glass panel.

The spring holders 5a are welded to predetermined positions of the H members 2a and 2b and the V members 3a and 3b, respectively. Also, H members 2a and 2b of frame 1
The aperture grill 4 is seam-welded to the frame 1 in a state where compressive stress is applied to the V members 3a and 3b so that the V-members approach each other. Further, the aperture grill 4 seam-welded to the frame 1 is trimmed and blackened.

Thereafter, V members 3a, 3 of frame 1
When the pressurization to b is released, the tension is set to each grill 4b of the aperture grill 4 by the restoring force (hereinafter referred to as the expansion mask set as described above), but the size is 1. Approximately 40-50 [kg / mm ² ] per book grill 4b
Becomes However, although the tension of the grill 4b varies between the central portion and the peripheral portion in the rectangular screen, the expansion mask having the tension of such a size has a maximum portion where each grill 4b is approximately 360-360. 400Hz
(Resonant frequency). With such a spreading mask, even if the electron beam emitted toward the face panel collides with the aperture grill 4 and its temperature rises, the expansion is absorbed and the landing position shift of the electron beam is reduced. Can be prevented.

Reference numerals 7a and 7b denote damper springs for extending the two damper wires 8a and 8b so as to be orthogonal to the grill 4b. As the damper wires 8a and 8b, for example, a tungsten wire having a diameter of 15 μm is used, and acts to suppress the vibration of the grill 4b.

[0010]

As described above, in the conventional color cathode ray tube, the maximum resonance frequency is about 360 to 400H.
The spreading mask set to z was used as a color selection electrode. One of the reasons is that such a spreading mask has an anti-vibration effect to attenuate the screen shake caused by an external mechanical shock early (generally, about 10 seconds). However, the stretching mask set to the above-mentioned tension is used in the blackening process where a high temperature is applied.
There is a problem that the aperture grill 4 often undergoes plastic deformation such as creep, and the grill 4b is likely to be twisted.

If the aperture grille 4 is twisted, the width of the slit through which the electron beam passes will vary in size, and the stripe width will vary when a fluorescent screen is formed on the inner surface of the face panel of the bulb. On a phosphor screen with a variable stripe width, unevenness (hereinafter referred to as “smear unevenness”) appears in the black and white vertical stripes when an image is projected. Become noticeable.

As a measure against such uneven streaks, it is possible to reduce the expansion frequency by reducing the compressive stress applied to the V-members 3a and 3b. By lowering the expansion frequency of the aperture grill to about 300Hz,
This is because the amount of twist in the grill is reduced and the unevenness is improved. However, when the expansion frequency is reduced, the effect of preventing vibration of the aperture grille becomes insufficient. For example, even if the vibration of the grille is caused by vibration of a speaker or the like, the mislanding of the electron beam cannot be easily accommodated. If the screen shake lasts for a long time when an external impact is applied as described above, there is also a problem that a person viewing the screen of the cathode ray tube is uncomfortable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to set a low expansion frequency to eliminate uneven streaks due to twisting of a grill, and to converge a screen shake early. It is to provide a color cathode ray tube which can be used.

[0014]

A color cathode ray tube according to the present invention is fired toward a bulb having a phosphor on the inner surface of a face panel, a panel pin provided on a side wall of the bulb, and a face panel of the bulb. Electrode having a plurality of transmission holes through which the electron beam passes, a frame for holding the color selection electrode at a predetermined position facing the inner surface of the face panel of the bulb, and a fitting fitted to the panel pin. Forming a plate with a hole, comprising an elastic support for elastically supporting the frame of the color selection electrode, the elastic support, the end portion fixed to the frame side of the color selection electrode,
An end portion in which a fitting hole for a panel pin is formed is defined by first and second bent portions, respectively, and in an intermediate region defined by the first and second bent portions,
A vibration suppressing mechanism for attenuating vibration transmitted from the valve side via the fitting hole is provided.

According to the second aspect of the present invention, in the elastic support, a rectangular cut portion having three sides cut is formed in a region defined by the first and second bent portions. Is cut and bent, thereby bringing the elastic support and the cut-side cut surfaces of the cut and raised sides into point contact with each other to form a vibration suppressing mechanism.

According to the third aspect of the present invention, the cut portion of the elastic support has a cut surface obliquely inclined at a predetermined angle with respect to the surface of the plate.

According to the fourth aspect of the present invention, the width of the cut portion is formed to be approximately 1/2 of the plate width of the elastic support.

Further, according to the fifth aspect of the present invention, the cut portion of the elastic support is in point contact with at least two or more cut surfaces on two sides of the cut and raised cut piece.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

Embodiment 1 FIG. 1 is a perspective view showing the shape of the elastic support used in the first embodiment. In FIG. 1, one end of a spring 6 forming a plate is
The spring holder 5a fixed to the frame 1 shown in FIG.
5b is fixed by welding or the like, and has a fitting hole 60 at the other end for fitting to a panel pin.

The end on the fixed side of the spring 6 is defined by a first bent portion 61, and the end on which the fitting hole 60 is formed is a second bent portion opposite to the first bent portion. Are defined by the bent portions 62 of the first and second portions.
Further, a rectangular tongue piece 64 is formed in an intermediate region defined by the first and second bent portions 61 and 62 by a U-shaped cut portion 63 opened in the long side direction of the strip-shaped plate. Have been.

The tongue piece 64 formed by the cut portion 63 in this way is at an angle of about 30 degrees in a direction opposite to the first bent portion 61 along a line connecting the start end and the end of the cut portion 63. It has been cut and raised. The tongue piece 6
At an intermediate position of No. 4, the first bent portion 61 is bent at an angle of about 70 degrees in the same direction. In the tongue piece 64 thus formed, the cut portion 63 and the cut surface of the cut and raised two sides of the tongue piece 64 are in point contact with each other in the middle region of the plate of the elastic support 6. The frame constitutes a vibration suppressing mechanism for attenuating the vibration transmitted from the valve side to the spring 6 via the fitting hole 60.

The cut surface of the cut 63 is inclined at an angle of about 45 degrees with respect to the surface of the plate of the spring 6. Since the tongue piece 64 is securely in contact with each cut surface of the cut portion 63 by being formed on such a cut surface, the spring 6 itself suppresses vibration transmission with respect to an impact applied to the frame from the outside. , Large frictional force will act.

Next, the vibration suppressing action of the spring 6 in the color cathode ray tube according to the first embodiment will be described in comparison with a color cathode ray tube using a conventional spring (FIG. 4). In the conventional spring, a vibration suppression mechanism for attenuating vibration transmitted from the valve side via the fitting hole is not provided in an intermediate region defined by the first and second bent portions. In the following, when comparing the functions of these springs, the decay time of the vibration generated in the aperture grille 4 will be considered.

Table 1 shows the results of measuring the amplitude in the tube axis direction and the decay time of the cathode ray tube with respect to the vibration of the aperture grill due to the impact. Here, the notch 63
, The spring (specification 1) in which the width (w) of the tongue piece 64 is 1/5 that of the strip width (W), The measurement results are shown for four types of springs (specification 2) having a width ratio (w / W) of 1/3 (specification 2) and a spring having a width ratio (w / W) of the tongue piece 64 of 1/2 (specification 3). The external impact force was constant, and the maximum expansion frequency of the aperture grille was 300 Hz, which was lower than the conventional expansion frequency, and the vibration condition at the center of the screen was measured.

[0026]

[Table 1] The measurement location was set at the center of the screen because the vibration width appears larger than other portions for the same impact, and the decay time is known to be longer. Here, the decay time was measured from the time immediately after the application of the impact force until the vibration width of the grill decayed to 3 μm or less. This is because if the vibration is 3 μm or less, the image of the color cathode ray tube does not have the effect of the screen shake.

According to the measurement results shown in Table 1, when the spring of any specification is compared with the conventional one,
Since the vibration damping time is shortened and the initial amplitude in the tube axis direction is also reduced, the operation and effect of the vibration suppressing mechanism can be understood.

In the case of a color cathode ray tube using an aperture grille of specification 3 in which the width w of the tongue piece 64 is formed to be half the width W of the spring 6, the amplitude immediately after the impact is applied. The value is 54 μm, which is about half the amplitude value of the conventional spring, and has a remarkable effect such that the decay time is reduced to about ３.

Embodiment 2 FIG. 2 is a perspective view showing the shape of the elastic support used in the second embodiment. In FIG. 2, one end of a spring 6 forming a plate is
The spring holder 5a fixed to the frame 1 shown in FIG.
5b is fixed by welding or the like, and has a fitting hole 60 at the other end for fitting to a panel pin. As in the first embodiment, a rectangular tongue piece 64 is formed by a U-shaped cut portion 63 in an intermediate area defined by the first and second bent portions 61 and 62.

Here, while the tongue piece 64 of the spring 6 in the first embodiment is bent only once at the intermediate position, the number of times the tongue piece 64 is bent twice. Are different in that By increasing the number of times the tongue piece 64 constituting the vibration suppressing mechanism is bent, the number of times of the point contact between the notch 63 and the tongue piece 64 can be increased. Therefore, by bending the tongue piece 64 twice or more at an appropriate angle according to its length, the vibration suppressing effect of the spring 6 can be further enhanced as compared with the case of the first embodiment.

Table 2 shows the results of measuring the amplitude in the tube axis direction of the cathode ray tube and the decay time with respect to the vibration of the aperture grille in the same manner as in Table 1. What is shown as the specification 3 on the left end is a result measured under the same conditions as the specification 3 on the right end of Table 1, and the measurement result shown as the specification 4 shows that the number of bending of the tongue piece 64 is 2 When using the springs of specifications 5 and 6, the number of bending
This is the value when springs are used. The width (w) of the tongue of the spring is 1/2 of the plate width (W), the external impact force is constant, and the maximum expansion frequency of the aperture grill is 300 Hz. Using a value lower than the conventional expansion frequency, the vibration condition at the center of the screen was measured.

[0032]

[Table 2] According to the measurement results shown in Table 2, when the tongue piece 64 formed in the cut portion 63 is bent a plurality of times, the initial tube axial amplitude does not change, but the number of bending times is at least two or more. Then, the decay time can be reduced to 10 seconds or less.

Embodiment 3 Embodiments 1 and 2 described above
In each case, the color selection electrode used in the color cathode ray tube was of an aperture grill type. However, the color selection electrode of the shadow mask type is also positioned by the frame 1 shown in FIG. 3, and is supported by the elastic support shown in FIG. Then, a similar experiment was conducted with a shadow cathode type color cathode ray tube using the spring shown in FIG. 1, and it was confirmed that the present invention can be similarly applied to a shadow mask type.

Table 3 shows the vibration of the shadow mask.
5 shows the results of measuring the tube axis direction amplitude and the decay time of a cathode ray tube. The spring of specification 4 shown here is the same as the spring shown in FIG. 1 in the first embodiment, and the width (w) of the tongue of the spring is １ ／ of the plate width (W), and The number of times of bending is two.

[0035]

[Table 3] It should be noted that the spring 6 according to the above-described three embodiments is not limited to this.
The size, thickness, position of fixing to the frame 1 and the like are the same as those of the conventional color cathode ray tube.

[0036]

Since the present invention is configured as described above, it has the following effects.

According to the color cathode ray tube according to the first aspect,
Even when the maximum resonance frequency is reduced to eliminate the uneven streaks, the screen shaking is quickly attenuated, and an easy-to-view image can be provided.

According to the color cathode ray tube of the second aspect,
Since the notch formed in the elastic support is cut and raised and bent, the elastic support and the cut side of the cut side of the two sides are brought into point contact with each other to constitute a vibration suppressing mechanism. Vibration can be reliably suppressed.

According to the color cathode ray tube according to the third aspect,
Since the cut portion of the elastic support forms a cut surface obliquely inclined at a predetermined angle with respect to the surface of the plate body, the two are surely brought into point contact with each other, and the vibration suppressing effect can be realized.

According to the color cathode ray tube of the fourth aspect,
The width of the cut portion of the elastic support is set to approximately 1 of the plate width of the elastic support.
By setting the ratio to / 2, the initial vibration amplitude in the tube axis direction can be reduced.

According to the color cathode ray tube according to the fifth aspect,
Since the cut portions of the elastic support are in point contact with the cut surfaces of the cut sides of the cut pieces at at least two points, the convergence time of screen shake can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a shape of an elastic support used in the first embodiment.

FIG. 2 is a perspective view showing the shape of an elastic support used in the second embodiment.

FIG. 3 is a perspective view showing a configuration of a conventional aperture grill type color selection electrode.

4A and 4B are a perspective view and a cross-sectional view showing a resilient supporter for resiliently supporting a frame of a conventional color selection electrode.

[Explanation of symbols]

1 frame, 2a, 2b first support (H member), 3a, 3b second support (V member), 4
Aperture grill, 5a, 5b spring holder, 6a, 6b, 6 spring, 7a, 7b damper spring, 8a, 8b damper wire, 60
Fitting holes, 61, 62 first and second bent portions, 6
3 notches, 64 tongues.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Sakaiya 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5C031 BB08

Claims (5)

[Claims] 1. A bulb having a phosphor on an inner surface of a face panel, a panel pin provided on a side wall of the bulb, and a plurality of transmission holes for transmitting an electron beam emitted toward the face panel of the bulb. A frame for holding the color selection electrode at a predetermined position facing the inner surface of the face panel of the valve; and a plate having a fitting hole fitted to the panel pin, An elastic support for elastically supporting the frame of the color selection electrode, wherein the elastic support has an end portion fixed to the frame side of the color selection electrode and a fitting hole for the panel pin. An end portion is defined by first and second bent portions, respectively, and is transmitted from the valve side to the intermediate region defined by the first and second bent portions via the fitting hole. A color cathode ray tube characterized by being provided with a vibration suppressing mechanism for attenuating the vibrations caused. 2. The elastic support body has a rectangular cut portion having three sides cut in a region defined by the first and second bent portions, and the cut portion is raised and bent. 2. The color cathode ray tube according to claim 1, wherein the vibration suppressing mechanism is configured by bringing the elastic support and the cut-away cut surfaces of the two cut sides into point contact with each other. 3. 3. The color cathode ray tube according to claim 2, wherein the cut portion of the elastic support has a cut surface obliquely inclined at a predetermined angle with respect to the surface of the plate. 4. The color cathode ray tube according to claim 2, wherein a width of the cut portion is formed to be approximately one half of a plate width of the elastic support. 5. The collar according to claim 2, wherein the cut portions of the elastic support are in point contact with at least two or more cut surfaces on two sides of the cut and raised cut pieces. Cathode ray tube.