JPH0877952A - Image display device - Google Patents

Abstract

PURPOSE: To provide an image display device by which the vibration of line cathodes is prevented and a high-quality image is stably supplied by arranging a mechanism to successively convert vibrational energy of the line cathodes into kinetic energy and thermal energy. CONSTITUTION: The height of line cathodes (2A to 2D) is regulated by a height regulating bar 15, and positioning in the Y direction is performed by a Y direction positioning frame body 14, and they are stretched by applying tensile force by line cathode springs 13. The line cathodes 2 are inserted in eccentric hole parts of eccentric rings (107A to 107D), and the eccentric rings 107 are inserted in a regulating groove 19 arranged in a regulating metal fitting 106, and are always contacted with regulating parts (20A to 20D), and the height regulating bar 15 and the Y direction positioning frame body 14 are formed of an insulating material. With this constitution, when the line cathodes 2 vibrate by an action of external force, the eccentric rings 107 make vertical motion, and convert vibrational energy of the line cathodes 2 into kinetic energy of the eccentric rings 107, and the eccentric rings 107 rub against the regulating parts 20, and the kinetic energy of the eccentric rings 107 becomes thermal energy, and dissipates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat type image display device used for a television receiver, a display for a computer terminal or the like.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube has been widely used as an image display device. A cathode ray tube is excellent in display characteristics such as brightness, contrast or color reproducibility of a display screen, but has a disadvantage that it requires a large space for installation because of its structurally long depth. On the other hand, a thin image display device has been developed which uses a liquid crystal display element, a plasma display element, an EL display element, and the like to realize space saving, but none of them has sufficient display characteristics. Therefore, in order to have a display characteristic similar to that of a cathode-ray tube and to realize a thin display, the image on the screen is divided into matrix-shaped sections without gaps, and each section of the display screen divided into small sections is scanned with an electron beam to produce fluorescent light. There is an image display device that emits light from the body and forms an image as a whole.

An example of the above-mentioned conventional image display device will be described below with reference to the drawings.

FIG. 5 shows the structure of a conventional image display device. In FIG. 5, 1 is a back electrode, 2 is a line cathode as an electron beam source, 3 is an electron beam extraction electrode, 4
Are signal electrodes, 5 and 6 are converging electrodes, 7 is a horizontal deflection electrode, and 8 is a vertical deflection electrode. These components are provided in a glass container 9 and a glass container 10 coated with a phosphor that emits light when irradiated with an electron beam. It is housed in a container, and after being welded with, for example, molten glass, the container is evacuated. The line cathode 2 is formed by coating an oxide cathode material on the surface of, for example, a tungsten wire, and is horizontally stretched so as to generate an electron flow uniformly distributed in the horizontal direction.

FIG. 6 is a view showing a structure of extending the wire cathode of a conventional image display device. In FIG. 6, 2a-2
D is a line cathode, 13 is a line cathode spring for applying tension to the line cathode, 15 is a height regulating bar for regulating the height of the line cathode 2, and 14 is the positioning of the line cathode 2 in the Y direction. Y-positioning frame body, 17 a to 17 d are structures made of an insulating material for preventing vibration and have a hole at a position eccentric from the center of gravity, and 16 is a structure 1 made of the insulating material.
7 is a restriction metal fitting for restricting the position of 7 and 16a is a restriction hole on the restriction metal fitting for inserting the structure 17 made of the insulating material and having a clearance with the structure 17 made of the insulating material. is there. Here, the structure 17 composed of the insulating material is composed of the insulating material when the wire cathode 2 starts to vibrate due to an external impact or a vibration from a mounted speaker. The vibration energy is transmitted to the structure 17, and plays a role of diffusing vibration energy to the restriction fitting 16 by friction with the restriction hole 16a into which the structure 17 made of the insulating material is inserted (Japanese Patent Laid-Open No. 3-184247).
Issue).

The operation of the image display device configured as described above will be described. First, a heater current is passed through the line cathode 2 to heat it, thereby facilitating electron emission. In the heated state, an appropriate voltage is applied to the back electrode 1, the linear cathode 2, and the extraction electrode 3 to emit a sheet-shaped electron beam from the surface of the linear cathode 2. The sheet-shaped electron beam is divided into a plurality of pieces by the through-holes of the extraction electrode 3 and becomes a large number of electron beam streams 11. The passing amount of the electron beam flow 11 is adjusted by the signal electrode 4 for each electron beam flow according to the video signal applied to the signal electrode 4.

Next, the electron beam flow 11 passing through the signal electrode 4 is focused and shaped by the electrostatic lens effect of the through holes of the focusing electrodes 5 and 6, and then deflected by the horizontal deflection electrode 7 and the vertical deflection electrode 8. To be done. Further, a high voltage (for example, 10 KV) is applied to the metal back layer of the screen 12, and the electron beam flow 11 is accelerated and collides with the metal back, causing the phosphor to emit light.

An image is formed as a whole by making one electron beam flow correspond to each of the divided display screens and controlling the electron beam as described above.

[0009]

However, in the above-mentioned conventional configuration, in order to always obtain a high-quality image in the above-described configuration, there are the following problems.

When a disturbance such as a shock or a vibration due to a speaker acts on the image display device, the linear cathode 2 starts to vibrate mainly as a simple vibration. In this case, the kinetic energy of the structure 17 and the vibration energy due to the friction between the structure 17 and the regulation hole 17a are diverged to dampen the vibration of the linear cathode 2. In the regulation hole, in use, as shown in FIG. 7, a rotational movement is generated with the contact portion between the structure made of an insulator and the regulation hole as a fulcrum, and the wire cathode 2
Cannot be sufficiently attenuated, and as a result, the brightness on the screen changes periodically, and a stable and high-quality image cannot be obtained.

In view of the above problems, the present invention provides an image display device capable of stably supplying a high-quality image by preventing the line cathode from vibrating even when the vibration propagates to the image display device. It is a thing.

[0012]

In order to achieve this object, the image display device of the present invention has a structure in which a wire cathode is inserted at both ends of the wire cathode and has a hole at a position eccentric from the center of gravity. The position of the structure can be regulated by inserting the structure into a regulation groove provided with a regulation part that is always in contact with the structure composed of the insulator, and at the same time provided on the structure and the regulation groove. It is possible to prevent the vibration of the wire cathode by friction with the regulating portion.

Further, both ends of the wire cathode are penetrated through a structure which is made of an insulating material and has a hole at a position eccentric from the center of gravity, and a regulation hole opened so that the extension axis and the central axis of the wire cathode do not overlap. The position of the structure can be regulated by inserting the structure into the housing, and at the same time, the vibration of the wire cathode can be prevented by the friction between the structure and the regulation hole.

[0014]

With this construction, a structure having both ends of the wire cathode made of an insulating material and having holes at positions eccentric from the center of gravity is inserted, and the wire cathode is inserted into a restriction groove provided with a restriction portion which is always in contact with the structure. By doing so, even when vibration of the line cathode due to an external force to the image display device occurs, the vibration energy of the line cathode is immediately converted into kinetic energy of the structure, and further, the structure and the structure are always in contact with each other. Friction with the restriction portion dissipates the heat energy as heat energy in the restriction metal fitting, so that the vibration of the wire cathode is stopped and a stable image can be provided. Further, even when the wire cathode vibrates due to an external force applied to the image display device, the vibration energy of the wire cathode is immediately converted into the kinetic energy of the structure, and the stretching axis and the central axis of the structure and the wire cathode do not overlap. Friction with the regulation hole dissipates the regulation metal as heat energy and the vibration of the wire cathode stops, so that a stable image can be provided.

[0015]

【Example】

(Embodiment 1) An image display apparatus according to a first embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the structure of an image display device in an embodiment of the present invention, and the other structure is the same as the structure shown in FIG. 5 of the prior art.

In FIG. 1, 1 is a back electrode, 2a to 2d are line cathodes, 107 is an insulator, and a structure having a hole 21 at a position eccentric from the center of gravity (ceramics are used in the following examples. Reference numeral 106 designates an eccentric ring.), 106 is a restriction metal fitting having a restriction groove 19 into which the eccentric ring 107 is inserted, and restriction portions 20a to 20d provided on the restriction groove 19, 15 is a height restriction bar, and 14 is a Y-direction positioning. The frame body 13 is a wire cathode spring. Although only one end of the wire cathode is shown in FIG. 1, the other end has the same shape.
The height of the line cathode 2 is regulated by a height regulating bar 15, and the Y direction positioning frame body 14 further positions the line cathode 2 in the Y direction. Each of the wire cathodes 2 is stretched by applying a tension by a wire cathode spring 13. The wire cathode 2 is inserted into the hole of the eccentric ring 17. Also, the eccentric ring 17
Is inserted into the restriction groove 19 provided in the restriction fitting 16, and is always in contact with the restriction portion 20. Both the height regulating bar 15 and the Y-direction positioning frame body 14 are made of an insulating material (ceramic is used in the embodiment), so that the wire cathode 2 is insulated.

A case will be examined below in which a disturbance such as an impact force or a vibration of a speaker attached to the image display device having the wire cathode stretch structure constructed as described above acts. When an external force acts, the wire cathode starts to vibrate at a certain natural frequency. Then, the eccentric ring 107 in which the wire cathode 2 is inserted moves up and down, and the vibration energy of the wire cathode 2 is converted into the kinetic energy of the eccentric ring 107.
Further, the eccentric ring 10 is rubbed against the restricting portion 20 provided on the restricting groove 19 so that the eccentric ring 10
The kinetic energy of 7 is heat energy and is a metal fitting 16
Is transmitted and dissipated. At this time, vertical gravity acts on the center of gravity of the eccentric ring 107, and only a very small force acts on the portion of the regulation groove 19 in contact with the regulation portion 20. Therefore, the contact portion cannot serve as a fulcrum, the vertical movement of the eccentric ring 107 is facilitated, and the vibration energy is quickly transmitted to the restriction fitting 16.

(Embodiment 2) An image display apparatus according to a second embodiment of the present invention will be described below with reference to the drawings.

FIGS. 3 and 4 show the structure of the image display device according to the embodiment of the present invention, and the other structure is the same as that shown in FIG.

In FIG. 3, 1 is a back electrode, 2i-2ni are line cathodes, 22i and 22b are insulators, and a structure having a hole 23 at a position eccentric from the center of gravity (ceramic in the embodiment). Hereafter, referred to as an eccentric ring.), 24 is a restriction metal fitting, 25 is a restriction hole provided so that the extension axis of the line cathode 2 does not coincide with the central axis, 26 is a height restriction bar, and 27 is Y.
The directional positioning frame member 28 is a wire cathode spring. FIG. 1
Although only one end of the wire cathode is shown in the figure, the central axis of the regulation hole 25 at the other end is symmetrical to the side illustrated with respect to the stretch axis of the wire cathode 2 (see FIG. 4). . The height of the line cathode 2 is regulated by a height regulating bar 26, and the Y cathode is positioned by the Y direction positioning frame 27 in the Y direction. Each of the line cathodes 2 is stretched by applying a tension by a line cathode spring 28. The wire cathode 2 penetrates the hole 23 of the eccentric ring 22. Also, the eccentric ring 22 is
It is fitted in a restriction hole 25 whose center axis does not coincide with the stretching axis of the wire cathode 2 provided in the restriction fitting 24. Height control bar 2
6 and the Y-direction positioning frame body 27 are both made of an insulating material (ceramic is used in the embodiment).
Are each insulated.

Consider a case in which an external disturbance such as an impact force or a vibration of an attached speaker acts on the image display device having the wire cathode straddling structure configured as described above. When an external force acts, the line cathode 2 starts to vibrate at a certain natural frequency. Then, the eccentric ring 2 through which the wire cathode 2 penetrates and is installed
2 causes free movement, and the vibration energy of the wire cathode 2 is converted into the kinetic energy of the eccentric ring 22. Further, due to the eccentric ring 22 colliding with and rubbing against the restriction hole 25 provided in the restriction fitting 24, the kinetic energy of the eccentric ring 22 is dissipated through the restriction fitting 24 as heat energy. At the same time, the restricting hole 25 into which the eccentric ring 22 is fitted has a central axis at a position where it does not overlap with the stretch axis of the wire cathode 2, and the restricting holes 25 at both ends are the stretch axis of the wire cathode 2. Since the eccentric ring 22 is freely moving, the contact state between the eccentric ring 22 and the restriction hole 25 is not the same on the left and right because the eccentric ring 22 is free to move. At both ends, forces having different directions and magnitudes act on the wire cathode. As a result, the vibration mode of the linear cathode 2 is disturbed, and the vibration is suppressed.

[0023]

As described above, according to the present invention, even when an external force acts on the image display device and the vibration of the line cathode occurs, the vibration is caused by the contact between the restriction portion provided on the restriction groove and the eccentric ring. Since the energy is dissipated as heat energy by the friction between the eccentric ring and the regulation hole, the vibration of the wire cathode is stopped, and a stable and high-quality image can be provided. Further, as described above, according to the present invention, due to the contact between the restriction hole and the eccentric ring provided at the symmetrical position with respect to the stretch axis of the wire cathode, the vibration mode is disturbed and the vibration is suppressed, and at the same time, the vibration is suppressed. Since the energy is dissipated as heat energy by the friction between the eccentric ring and the restriction hole, the vibration of the wire cathode is stopped, and an image display device that stably displays a high-quality image can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a cathode stretched portion of an image display device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an eccentric ring and a cathode suspension shaft according to the first embodiment of the present invention.

FIG. 3 is a partially exploded perspective view of an image display device according to a second embodiment of the present invention.

FIG. 4 is a plan view of an eccentric ring insertion portion according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a conventional image display device.

FIG. 6 is a partially exploded perspective view of a cathode stretch portion in a conventional image display device.

FIG. 7 is a side view showing an eccentric ring in a conventional image display device.

[Explanation of symbols]

 2 (2 a to 2 d) Wire cathode 16 and 24 Regulation metal fittings 17 (17 a to 17 d) Eccentric ring 19 Regulation groove 20 (20 a to 20 d) Regulation part 21, 23 hole 25 Regulation hole

Claims (2)

[Claims] 1. A plurality of line cathodes, an electrode group for controlling an electron beam emitted from the line cathodes, and the electrode group on the opposite side through the line cathodes and parallel to the electrode group. A back electrode, a screen provided with a phosphor that emits light when an electron beam collides with it, a wire cathode spring that applies tension to the wire cathode, a restriction bar that restricts the height of the wire cathode, and the wire cathode A positioning frame for positioning in one direction, a structure having both ends of the wire cathode inserted therein and having a hole at a position eccentric from the center of gravity, and a restriction groove and a restriction portion for restricting the position of the structure An image display device comprising: a restricting metal fitting. 2. A plurality of line cathodes, an electrode group for controlling an electron beam emitted from the line cathodes, and the electrode group on the opposite side of the line cathodes and parallel to the electrode group. A back electrode, a screen provided with a phosphor that emits light when an electron beam collides with it, a wire cathode spring that applies tension to the wire cathode, a height control bar that regulates the height of the wire cathode, and A positioning frame for positioning the wire cathode in one direction, a structure made of an insulator into which both ends of the wire cathode are inserted, and having a hole at a position eccentric from the center of gravity, and a restriction hole for restricting the position of the structure. And a center line of the regulation hole of the regulation metal is eccentric without intersecting with a stretch axis of the line cathode, and the regulation holes corresponding to both ends of the line cathode are the line cathode. Be placed symmetrically with respect to the An image display device characterized by: