JPH05211042A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To attenuate the vibrations of metallic fine wires on a grid structure, in which a large number of metallic fine wires arranged in parallel are welded to a frame under tension, in a short time, and to prevent the generation of shadow due to a damp fed. CONSTITUTION:Stringy members 5 such as glass fibers are fixed to metallic fine wires 1 with frit glass or the like in the vicinity of weld points of metallic fine wires 1 to a frame 3.

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, and more particularly to a color cathode ray tube in which a metal strip is stretched on a frame.

[0002]

2. Description of the Related Art Conventionally, some techniques for preventing vibration of a metal strip have been proposed, but the most basic technique can be said to be applied to the surface of the metal strip 1 as shown in FIG. A dump rod 6 made of a metal wire that comes into contact with is disposed, and the dump rod 6 is stretched by an elastic piece 7 that is erected on the frame 3 (for example, Japanese Patent Publication No. 46-30870).
(See Japanese Patent Publication)).

That is, a dump rod 6 made of a thin metal wire having a diameter of about 20 μm in a direction perpendicular to the metal strip 1 is tensioned at both ends with elastic pieces 7 and lightly contacted with the metal strip 1. The vibration of the metal strip 1 is damped and suppressed by keeping the metal strip 1 in the open state.

[0004]

However, the conventional method of preventing the vibration of the metal strip by the dump rod has a problem that a shadow due to the dump rod is generated on the screen.
That is, at the time of exposure, the light from the exposure table is blocked by the dump rod and a thin shadow is formed on the fluorescent film.

Further, when the screen is illuminated even after the completed cathode ray tube, there is a problem that the electron beam is blocked by the dump rod and a black line is generated on the screen.

[0006] These problems become more serious in high-resolution tubes with high resolution in which scanning lines increase and pixels become finer, and in cathode-ray tubes for high-definition, because shadows due to dump rods are more conspicuous than conventional tubes. ing.

An object of the present invention is to provide a color cathode ray tube which can be used as a high resolution tube or a cathode ray tube for a high definition tube.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a grid assembly having a pair of opposing frames and a plurality of metal strips which are welded to the pair of frames and stretched parallel to each other. In a color cathode ray tube, filaments are fixed to at least one surface of both ends of the metal strip in parallel with the welding point.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a perspective view of a grid structure according to a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, first, the metal strip 1 is formed by etching to a thickness of about 0.05.
After welding a mask plate 2 of a thin iron plate of ˜0.2 mm to the frame 3 in a state where the frame arm portion 4 is compressed, the pressure is released to bridge the metal strip 1 to the frame 3 under tension. To stretch.

Next, a systematic material 5 that can withstand a high temperature of 450 ° C., for example, a systematic material 5 made of glass fiber or stainless fiber is attached to both ends of the metal strip 1 by frit glass or the like, The systematic material 5 is fixed to both ends of the metal strip 1 by passing through the furnace at about 450 ° C.

As a result, the thread-like material serving as an attenuating material is applied to the metal thin wire 1 with respect to the metal thin wire 1 which is in a state where it is very easy to vibrate.
By attaching to both ends of, it is possible to significantly reduce the vibration of the metal strip 1. That is, if both ends that are nodes of vibration are in contact with a solid material with high hardness by the same principle as a string of a guitar stretched with strong tension, the string (metal strip) vibrates well, but the vicinity of both ends If a thread-like object 5 is used, the knots will not be fixed, and the vibration will be absorbed immediately. Moreover, unlike the dump rod, since it is not stretched near the center of the screen, it is possible to solve all the big problems of the conventional technique that a shadow is generated on the screen.

In the second embodiment, the filamentous material is fixed to both the front and back sides near both ends of the metal thin shape, and a higher vibration damping effect can be obtained.

[0015]

As described above, according to the present invention, in a color cathode ray tube grid structure in which a plurality of metal strips are welded to a frame in a state where tension is applied in parallel, a temperature of 450 ° C. is provided near both ends of the metal strips. Since a filamentous material that can withstand high temperatures is bonded with frit glass, etc., it can quickly damp the vibration of the metal strips, and it can be used as a high-resolution tube or a CRT for high-definition tubes without causing the shadow on the screen caused by the conventional dump rod. It has the effect of being able to respond.

[Brief description of drawings]

FIG. 1 is a perspective view of a grid structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of an example of a conventional grid structure of a color CRT.

[Explanation of symbols]

 1 metal thin wire 2 mask plate 3 frame 4 frame arm 5 thread 6 dump rod 7 elastic piece

Claims (3)

[Claims] 1. A color cathode-ray tube comprising a grid structure having a pair of frames facing each other and a plurality of metal strips which are welded to the pair of frames and stretched in parallel with each other. A color cathode ray tube characterized in that filaments are fixed to at least one surface of both ends of the in parallel to the welding point. 2. The color cathode ray tube according to claim 1, wherein the filamentous material is glass fiber. 3. The color cathode ray tube according to claim 1, wherein the filaments are stainless fibers.