JPH10199432A - Color cathode ray tube - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily prevent an increase in a coefficient of friction between a damper wire and an aperture grill due to scattering of getters,
Provided is a color CRT capable of suppressing line disturbance of an aperture grill. SOLUTION: Inside a color CRT 20, an aperture grill 26 is arranged at a predetermined position from a phosphor screen on the inner surface of a face panel 24. The flat grill 28 of the aperture grill 26 has two damper wires 32 at its upper and center portions.
A and 32B are stretched. At the rear of the frame 30 of the aperture grill 26, internal magnetic shielding plates 34A, 34
Place B. A getter 38 for scattering barium is arranged above the funnel unit 22. When barium is scattered by the heating of the getter 38, the scattering direction is blocked by the upper internal magnetic shielding plate 34A, the adhesion of barium to the upper damper line 32A is suppressed, and an increase in the coefficient of friction can be suppressed. .

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 (hereinafter referred to as C) having an aperture grille with a damper wire stretched over it.
RT).

[0002]

2. Description of the Related Art Conventionally, a color CRT having one electron gun provided with three cathodes of RGB, and having a stripe phosphor screen and an aperture grill (color selection electrode).
Is provided. FIG. 4 is a perspective view showing an aperture grill used for such a color CRT. This aperture grill 10 has a flat grill 12 in which slits 12a on vertical stripes are formed by etching a thin light steel plate.
Are fixed to the steel frame 14 by welding or the like with a predetermined tension. Further, in such an aperture grill 10, two damper wires 16A and 16B are stretched in a direction orthogonal to the slits 12a of the aperture grill 10, and are in contact with the electrode surfaces. This damper wire 16
A and 16B prevent resonance of the aperture grill due to forced vibration from outside the color CRT. The damper wires 16A, 16B are laid with a constant tension by damper springs 8A, 8B provided on the side of the aperture grill 10. The damper lines 16A and 16B are arranged in the lower half of the screen as shown in FIG.
A is disposed substantially at the center of the aperture grille 10, and the lower damper line 16 </ b> B is disposed below the aperture grille 10.

[0003] Further, a getter which is a special metal such as barium for increasing the degree of vacuum inside is attached to such a color CRT, and when the inside of the tube has been evacuated, the getter is heated. By evaporating barium or the like and scattering it in the tube, the residual gas is absorbed by condensation of the barium or the like. The getter is connected to an anode button provided above a funnel section of the color CRT, and is heated by applying an anode voltage.

[0004]

The damper wire 16 for preventing resonance of the aperture grille 10 as described above.
Since A and 16B are in contact with the electrode surface of the aperture grill 10, damper wires 16A and 16B are forced by external vibration.
A, 16B and the flat grill 12 are caught and the flat grill 12 cannot be fixed at a predetermined position, and line disturbance occurs. Also, the aperture grill 10 and the damper wire 1
Since the thermal expansion coefficients of 6A and 16B are different from each other, the thermal expansion of the aperture grill 10 causes line disturbance. Therefore,
It is necessary to reduce the friction coefficient between the flat grill 12 and the damper wires 16A, 16B as much as possible.

On the other hand, barium and the like scattered by the above-mentioned getter mainly scatter in a region below the aperture grill 10 as shown by a broken line a in FIG. This is because, as described above, the getter is provided near the anode button on the upper part of the funnel portion, and barium or the like scattered into the tube from the upper position is further provided on the upper and lower sides of the aperture grill 10. Since the barium or the like scattered upward is blocked by the upper magnetic shield plate because it reaches the aperture grill 10 through the gap between the magnetic shield plates, the barium or the like scattered downward is apertured through the upper and lower magnetic shield plates. This is to reach the lower side of the grill 10. However, in this way, barium etc.
When scattered in the lower region, a large amount of barium or the like adheres to the damper lines 16A and 16B arranged in this portion,
As a result, the friction coefficient between the damper wires 16A and 16B and the flat grill 12 becomes large, and there is a disadvantage that the above-described line disturbance is increased.

Accordingly, an object of the present invention is to provide a color CRT which can easily prevent an increase in the coefficient of friction between a damper wire and an aperture grill due to scattering of getters and can suppress line disturbance of the aperture grill. It is in.

[0007]

In order to achieve the above object, the present invention has an aperture grille having a damper wire for preventing resonance on a color selection electrode having vertical stripe slits, and has a function for scattering evaporated metal. In a color cathode ray tube having a getter provided in a funnel portion, a stretch position of a damper wire in the aperture grill is provided at a position avoiding a metal scattering region by the getter.

[0008] In the color CRT of the present invention, the damper line stretched over the aperture grill is located at a position avoiding the metal scattered area by the getter, that is, when the getter is provided on the upper side, the damper wire is located at the same upper portion of the aperture grill. By providing it on the side, the adhesion of scattered metal to the damper wire can be suppressed. Therefore, it is possible to easily prevent an increase in the coefficient of friction between the damper wire and the aperture grill, and to suppress line disturbance of the aperture grill.

[0009]

Next, a color CRT according to the present invention will be described.
The embodiment will be described. FIG. 1 is a front view showing an aperture grill provided in a color CRT according to the present invention, and FIG. 2 is a side sectional view showing an example of an internal configuration of the color CRT according to the present invention. As shown in FIG. 2, the color CRT 20 of the present embodiment is formed by joining a funnel portion 22 and a face panel 24 with frit glass. A fluorescent screen (not shown) is provided on the inner surface of the face panel 24, and The aperture grill 26 is arranged at a predetermined position from the surface. Further, a neck portion 40 is provided behind the funnel portion 22, and the neck portion 40
One electron gun (not shown) provided with three GB cathodes is provided. That is, the CRT of this example is
This is a trinitron color CRT in which three beams of RGB emitted from an electron gun are focused by an aperture grill 26 and are applied to phosphor lines on a phosphor screen through slits of the aperture grill 26.

Further, as shown in FIG. 1, the structure of the aperture grill 26 is the same as that shown in FIG. 4 except for the positions where the damper wires 32A and 32B are stretched. The flat grill 28 thus formed is fixed to a steel frame 30 by welding or the like with a predetermined tension. At the rear of the frame 30 of the aperture grill 26, internal magnetic shielding plates 34A and 34B are arranged. The internal magnetic shielding plates 34A and 34B are provided on both upper and lower sides of the frame 30, extend rearward from the frame 30, and are provided substantially parallel to the inner wall surface of the funnel portion 22.

An anode button 36 is provided on the upper part of the funnel 22, and a getter 38 is provided on the inner wall of the funnel 22 at a position near the anode button 36.
Is provided. In this example, a barium getter 38 is used. In the CRT 20 of the present embodiment, the scattered barium due to the heating of the getter 38 is scattered from the upper rear position in the CRT toward the front center as shown in FIG. Is scattered on the upper internal magnetic shielding plate 34A.
Blocked by Therefore, the aperture grill 26
The amount of barium scattered to the upper part of the substrate is suppressed.

Therefore, in the present embodiment, as shown in FIG. 1, the upper damper line 32
A is stretched to prevent the adhesion of barium. In addition, the lower damper line 32 </ b> B extends substantially in the center of the aperture grill 26. This is the same position as the upper damper line 16A of the conventional example shown in FIG. As described above, in the CRT 20 of the present embodiment, by adopting a structure for preventing the adhesion of barium to the damper wire 32A, it is possible to easily prevent an increase in the coefficient of friction between the damper wire 32A and the aperture grill 26. As a result, line disturbance of the aperture grill 26 can be suppressed.

FIG. 3 shows the above damper lines 32A, 3A.
It is explanatory drawing which shows the frequency | count of a line disturbance with respect to the spanning position of 2B in comparison with the spanning position of the damper wires 16A and 16B of the said prior art example. As shown in FIG.
A and 32B, the damper line 1 of the conventional example is used.
The occurrence rate of line disturbance can be reduced to one-fifth compared with the spanning positions of 6A and 16B. It should be noted that even when the suspension position of the damper line 32A is extended above the screen as in this example, it can be confirmed by actual measurement that the damper line 32A is inconspicuous in appearance. Therefore, according to this example, it is possible to effectively prevent the barium from adhering to the damper wire 32A with a simple configuration, suppress line disturbance of the aperture grill 26, and provide an extremely practical device.

[0014]

As described above, according to the present invention, the damper wire extended over the aperture grill is positioned at a position avoiding the metal scattering region by the getter, for example, when the getter is provided on the upper side, It is provided on the same upper side of the grill. Therefore, according to the present invention, it is possible to suppress the adhesion of scattered metal to the damper wire, to easily prevent an increase in the coefficient of friction between the damper wire and the aperture grill,
Line disturbance of the aperture grill can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view showing a stretched position of a damper wire in an aperture grill of a color CRT according to the present invention.

FIG. 2 is a side sectional view showing a structural example of a color CRT provided with the aperture grill shown in FIG. 1;

FIG. 3 is an explanatory diagram showing the number of occurrences of line disturbance in the aperture grill shown in FIG. 1 in comparison with the related art.

FIG. 4 is a perspective view showing a conventional aperture grill.

FIG. 5 is a front view showing a stretched position of a damper wire in a conventional aperture grill.

[Explanation of symbols]

20 ... color CRT, 22 ... funnel part, 24 ...
... face panel, 26 ... aperture grille, 28 ...
... flat grill, 30 ... frame, 32A, 32B
... damper wires, 34A, 34B ... internal magnetic shielding plate, 3
6 Anode button, 38 Getter, 40 Neck.

Claims (5)

[Claims] 1. A color selecting electrode having a vertically striped slit,
A color cathode-ray tube having an aperture grille with a damper wire for preventing resonance mounted thereon and a getter for evaporating metal scattering provided in a funnel portion, wherein a spanning position of the damper wire in the aperture grille is
A color cathode ray tube, wherein the color cathode ray tube is provided at a position avoiding a metal scattering region by the getter. 2. The color cathode ray tube according to claim 1, wherein a position where the aperture grill is stretched of the damper wire is provided on the same side as a mounting position of the getter in the funnel portion. 3. The getter is provided on an upper surface side of a funnel portion adjacent to an anode button provided on an upper portion of the funnel portion, and the damper line is provided on an upper side of the aperture grille with respect to the getter. The color cathode ray tube according to claim 1, wherein 4. The apparatus according to claim 1, wherein an internal magnetic shielding plate is provided in the funnel portion, and the damper wire is disposed at a position where the evaporation of the evaporated metal from the getter is blocked by the internal magnetic shielding plate. The color cathode ray tube as described. 5. A damper wire having two damper wires, one damper wire is provided at a center position of the aperture grill, and the other damper wire is provided on the same side of the aperture grille as the getter mounting position. 2. The color cathode ray tube according to claim 1, wherein: