JPH03184247A - Image display device - Google Patents

Abstract

PURPOSE:To reproduce a high quality image always stably by installing a structure, which consists of an insulative material and has a hole in a position eccentric from the center of gravity, penetratively at one end or the two ends of each wire cathode, and fitting a structure having a proper clearance and is equipped with an eccentric hole into a hole of a restraining tool in which a hole mating with the first named structure is bored. CONSTITUTION:Wire cathodes 30(i) thru 30(iv) are stretched and given a tension by a spring 35, and penetrate holes in eccentric rings 31(i) thru 31(iv). Wire a proper clearance, eccentric ring 31 is fitted in a restraining hole 32a, which is provided in a restraining tool 32 and mating with eccentric ring 31. Even in the case any external force applied to an image display device concerned is generated vibration on wire electrodes 30, the eccentric rings 31 at once abc sorb the vibratory energy, i.e., serve as a damper, to stop the vibration of the wire cathodes 30. Thereby a high quality image can be obtained stably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device for video equipment.

Conventional technology Conventionally, cathode ray tubes have been mainly used as color television image display elements, but cathode ray tubes are much longer in depth than screens, making it impossible to manufacture flat-screen television receivers. there were. Therefore, as a display element on a flat panel, there is a thin display element, a plasma display element,
Although liquid crystal display elements and the like have been developed, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility. Therefore, with the aim of displaying high-quality images comparable to those on a cathode ray tube using a flat-panel device that uses electron beams, the screen is divided into matrix-like sections without gaps, and the electron beam is applied to each section. 2. Description of the Related Art There is an image display device that performs deflection scanning to cause phosphors to emit light, thereby forming a color television image as a whole. An example of the conventional image display device mentioned above will be described below with reference to the drawings.

FIG. 5 shows the configuration of a conventional image display device.
In Figure 3, l is a back electrode, 2 is a line cathode as an electron beam source, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 and 6 are focusing electrodes, 7 is a horizontal deflection electrode, and 8 is a vertical deflection electrode. Yes, these components are placed in a glass container9.10
It is stored in a container and the inside of the container is evacuated. line cathode 2
is stretched horizontally so as to generate an electron flow that is uniformly distributed in the horizontal direction, and a plurality of such wire cathodes 2 are arranged vertically at appropriate intervals (here, only four wire cathodes 24 to 22 are connected). (shown) provided. These wire cathodes 2 are, for example, coated with an oxide cathode material on the surface of a tungsten wire. The back electrode 1 is made of a flat conductive material and is provided in parallel to the line cathodes 2a-22. The extraction electrode 3 faces the back electrode l via the line cathodes 2a to 22, and is made of a conductive plate having a row of through holes 11 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Although the through holes 11 are circular in the embodiment, they may be oval or rectangular, or may be slit-shaped. Each conductive plate has a similar through hole 13 at a position opposite to the through hole 11 of the extraction electrode 3. The shape of the hole 13 may be an ellipse or a rectangle, or it may be in the shape of a vertically elongated slit. The shape of the through hole 14 may be a circle, an ellipse, or a slit.
The shape of the slit hole 15 may be a round hole, an ellipse, or a rectangle. The space 18 created between the conductive plates 16 and 17 is a through-slit hole of the focusing electrode 6. It faces 15. The vertical deflector 8 has conductive plates 19.2 connected at their ends as shown in FIG.
0, that is, two comb-shaped conductive plates 19 and 20 are arranged on the same plane and interlocked with each other with an appropriate interval between them.

The screen 21 is constructed by coating the inner surface of the glass container 9 with a phosphor 22 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown) thereon. Further, the above-mentioned extraction electrode 3, signal electrode 4, focusing electrodes 5 and 6, horizontal deflection electrode 7, and vertical deflection amount i8 are each bonded with an insulating adhesive (not shown here), and are integrated into one piece. An electrode block 24 is formed.

The operation of the image display device configured as described above will be briefly described.

First, the wire cathode 2 is heated by passing a heater current in order to facilitate electron emission. Back electrode 1, vA cathode 2 in heated state
, by applying an appropriate voltage to the extraction electrode 3, a sheet-like electron beam is emitted from the surface of the line cathode 2. The sheet-like electron beam is divided into a plurality of parts by the through hole 11 of the extraction electrode 3, and becomes a large number of electron beam streams 23. This electron beam flow 2
3, the J overload of each electron beam stream is individually adjusted by the signal electrode 4 in accordance with the video signal applied to the signal electrode 4.

Next, the electron beam that has passed through the signal electrode 4 is directed to the focusing electrode 5.
Focusing by the electrostatic lens effect of the through holes 14 and 15 of 6,
Adjacent conductive plates 16 and 17 of the horizontal deflection electrode 7 after being shaped
The beam is deflected horizontally and vertically by the potential difference applied to adjacent conductive plates 19 and 10 of the vertical deflection electrode 8. Furthermore, the metal back layer of the screen 21 is applied with a high voltage (for example, l
0 KV) is applied, and the electron beam is accelerated to high energy and collides with the metal back, causing the phosphor to emit light.

When the television television screen is divided vertically and horizontally into a matrix to form a collection of subsections 25, each subsection is made to correspond to each electron beam separated as described above, and the electron beam is divided into each subsection. By deflecting and scanning only within minutes, the entire image can be displayed on the screen. Further, by controlling RGB video signals corresponding to each pixel using the signal electrodes 4, television moving images can be reproduced.

Problems to be Solved by the Invention In the configuration as described above, the following problems have been encountered in order to constantly obtain high-quality images.

As shown in Figure 6, the wire cathodes 2a to 22 have a diameter of several tens of μm.
The height is regulated by a height regulating bar 26 at both ends (only one side is shown), and the Y direction positioning frame 27 is used to
Performing direction positioning.

Further, a spring 28 attached to the Y direction positioning frame 27
tension is applied on both sides or on one side.

When vibration is applied from the outside to the image display device equipped with the line cathodes 2a to 22 positioned and stretched in this way, the line cathodes 2a to 22 mainly perform simple harmonic motion as shown in FIG. It starts vibrating and continues to vibrate until it stops damping. When the wire cathodes 2a-22 vibrate, the through-hole 11 of the extraction electrode 3 mentioned above
As a result, the brightness on the screen periodically changes, making it impossible to stably obtain a high-quality image.

In view of the above problems, the present invention provides an image display device that can always and stably reproduce high-quality images.

Means for Solving the Problems In order to solve the above problems, the present invention provides a structure in which one or both ends of all wire cathodes are made of an insulating material and have holes at eccentric positions from the center of gravity. , installed,
Vibration of the wire cathode can be suppressed by allowing the structure having the eccentric hole to move freely, and an appropriate clearance is provided in the hole of the regulating device having the hole corresponding to the structure having the eccentric hole. By fitting the structure having the eccentric hole with the holes, it is possible to control the position of the structure having the eccentric hole.

Function The function of the present invention is as described above, by penetrating and installing a structure made of an insulating material and having a hole at a position eccentric from the center of gravity at one end or both ends of the wire cathode.
Even if vibration of the line cathode occurs due to an external force applied to the image display device, the structure having the eccentric hole immediately absorbs the vibration energy of the line cathode, acts as a damper, and stops the vibration of the line cathode, so that the line cathode is stabilized. can provide high-quality images. Furthermore, by fitting the structure having the eccentric hole with an appropriate clearance into the hole of the regulating device having the hole corresponding to the structure having the eccentric hole, the structure having the eccentric hole can be formed. movement in the wire cathode stretching direction can be prevented.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of a line cathode extending portion of an image display device according to an embodiment of the present invention. 29 is the back electrode, 3
0i, 30 mouths, 30ha, 302 are line cathodes, 31i, 31
The mouth, 31 C, 3 is a structure made of an insulator and having a hole at an eccentric position from the center of gravity = hereinafter referred to as an eccentric ring (ceramic is used in the embodiment) 32 is a regulating fitting; 32
Reference numeral a designates a regulation hole provided in the regulation fitting 32, 33 a height regulation bar, 34 a Y-direction positioning frame, and 35 a wire cathode spring. Although FIG. 1 only shows the structure of one end of the wire cathode 30, the other end also has the same shape. line cathode 3
0 has its height regulated by a height regulating bar 33, and is further positioned in the Y direction by a Y direction positioning frame 34. Each of the wire cathodes 30a, 30b, 30c, and 302 is stretched by being given tension by a wire cathode spring 35. 30i, 30o, 30c, 302 are eccentric rings 31
The holes A, 310, 31C, and 312 are passed through.

Further, the eccentric ring 31 is fitted into a regulating hole 32a provided in the regulating fitting 32 and corresponding to the eccentric ring 31 with an appropriate clearance. Both the height regulating bar 33 and the Y-direction positioning frame 34 are made of an insulator (ceramic is used in the embodiment).
The mouth, 30c, and 302 are each insulated.

A case will be considered in which an external force such as vibration or impact is applied to an image display device having the 1s cathode extension section configured as described above. When external force is applied, wire #i pole 30a, 30mouth, 30ha,
30, the vibrations start at their respective natural frequencies. At the same time as the vibration starts, the eccentric rings 31A, 310, 31H, which are penetrated and installed in the wire cathodes 30I, 30 mouths, 30HA, 302,
3 causes free movement, the vibration energy of the wire cathode is converted into free kinetic energy of the eccentric ring 31, and the eccentric ring 31 causes free movement, so that they are fitted with an appropriate clearance. The free kinetic energy of the eccentric ring 31 that collides with and rubs against the regulating hole 32a is absorbed by the regulating fitting 32 through the regulating hole 32a, so that the vibration of the wire cathode 30 is immediately attenuated and stopped. Furthermore, although the eccentric ring 31 tries to move on the linear cathode 30 due to its free movement, its position is restricted by fitting into the regulating hole 32a with an appropriate clearance, and the eccentric ring 31 is positioned within the effective screen. This prevents the ring 31 from entering.

Further, in FIG. 1, the wire cathode stretched structure is arranged on a horizontal plane, but the anti-vibration effect and the positioning effect are the same regardless of whether it is arranged on a vertical plane or at any angle.

Effects of the Invention As described above, according to the present invention, even if vibration of the wire cathode occurs due to an external force applied to the image display device, the eccentric ring immediately absorbs the vibration energy and acts as a damper to stop the vibration of the wire cathode. , can provide stable and high-quality images.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view of a line cathode suspension part of an image display device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the operation of the eccentric ring when the image display device is placed on a horizontal plane.
Figure 3 is a cross-sectional view showing the operation of the eccentric ring when the image display device is placed on an inverted horizontal plane, and Figure 4 is a cross-sectional view showing the eccentric ring before it is installed when the image display device is placed on a vertical plane. 5 is a partially exploded perspective view showing the configuration of a conventional image display device, FIG. 6 is a partially exploded perspective view of a wire cathode strung part of the conventional image display device, and FIG. 7 is a partially exploded perspective view of the conventional image display device. FIG. 3 is a vibration mode diagram of a line cathode in FIG. 29... Back electrode, 30 (30i to 302)
... Line cathode, 31 (31 I - 31 II) ...
...Eccentric ring, 32...Restrictor, 32a.
...Regulation hole.

Claims (1)

[Claims] It includes a full glass container whose inner surface is coated with a phosphor, and a back container facing the full glass container, and a plurality of back electrodes made of one conductive plate are provided in the space sandwiched between the back container and the front glass container. In an image display device equipped with a book line cathode, an extraction electrode made of one or more conductive plates, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, one end or both ends of all the plurality of line cathodes are provided. A structure made of an insulating material and having a hole at an eccentric position from the center of gravity is penetrated and installed in the part, and the hole of the restrictor is provided with a hole corresponding to the structure having the eccentric hole, and an appropriate hole is inserted into the hole. An image display device characterized in that the structure having the eccentric hole is fitted with a clearance of .