JPH03184246A - Image display device - Google Patents

Abstract

PURPOSE:To have an image of high quality always stably by installing a structure, which consists of insulative material and is to couple two rings, penetratively at the ends of each wire cathode, and by installing an insulated wire between the wire cathodes and the junction of these two rings penetrative while located vertically to the wire cathodes. CONSTITUTION:Wire cathodes 30(i) thru 30(iv) are stretched and given a tension by a spring 35, and penetrate holes in two rings of W-rings 31(i) thru 31(iv). An insulated wire 32 is installed between the junctions 37(i) thru 37(iv) of these W-rings and the wire cathodes 30(i) thru 30(iv) while taking vertical positioning to the wire cathodes. Even in the case vibration is generated on the wire cathodes 30(i) thru 30(iv) by any external force applied to an image display device concerned, the W-rings 31(i) thru 31(iv) promptly absorb the vibratory energy, i.e., serve as a damper, to stop the vibration of the wire cathodes 30(i) thru 30(iv). Thereby 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, EL display elements, plasma display elements, liquid crystal display elements, and the like have been developed as flat display elements, but all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility. Therefore,
In order to display high-quality images comparable to those on a cathode ray tube using a flat device that uses electron beams, the screen is divided into matrix-like sections without gaps, and the electron beam is deflected and scanned for each section. to make the phosphor emit light,
There are image display devices that generally display color television images. An example of the conventional image display device mentioned above will be described below with reference to the drawings.

FIG. 2 shows the configuration of a conventional image display device.

In Figure 2, 2 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. and these components are placed in a glass container9.1
0 and the inside of the container is evacuated. The line cathodes 2 are stretched in the horizontal direction so as to generate an electron flow that is uniformly distributed in the horizontal direction. (Only four of the two are shown). These wire cathodes 2 are designed, for example, by coating the surface of a tungsten wire with an oxide cathode material. The pole 1 on the back surface 1 is made of a flat conductive material and is provided in parallel to the wA cathodes 24-22. The extraction electrode 3 faces the back electrode 1 via the line cathodes 2a to 22, and has through holes 1 provided at appropriate intervals in the horizontal direction.
It consists of a conductive plate having one row on a horizontal line opposite each line cathode. Although the through holes 11 are circular in the embodiment, they may be oval or rectangular, or may be slit-shaped. It consists of a plurality of rows of vertically elongated conductive plates 12 arranged in
The 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 through hole 13 may be an ellipse or a rectangle, or it may be in the shape of a vertically elongated slit.
It consists of a conductive plate with The shape of the through hole 4 may be circular, oval, or slit-like. Focusing 'f11 pole 6 is
The focusing electrode 5 has a vertically connected slit hole 15 at a position opposite to the focusing electrode 5. The shape of the slit hole I5 may be a round hole, an ellipse, or a rectangle.

The horizontal deflection electrode 7 is a conductive electrode connected by two comb-shaped ends that are interlocked with each other on the same plane with an appropriate interval between them. Fi1
The space 18 formed between the conductive plates I6.17 and 17 faces the through-slit hole 15 of the convergence 118i6. The vertical deflection electrode 8 has conductors connected at the ends as shown in FIG.
It consists of a number of comb-shaped conductive plates 19.2o interlocked with each other at appropriate intervals on the same plane. The screen 21 includes a phosphor 22 that emits light when irradiated with an electron beam.
is applied to the inner surface of the glass container 9, and a metal back layer (not shown) is added thereon. Further, the above-mentioned extraction electrode 3, signal electrode 4, focusing electrodes 5 and 6, horizontal deflection electrode 7, and vertical deflection electrode 8 are each made of an insulating adhesive (
(not shown here) to form an integrated electrode block 24.

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. In the heated state, the back electrode 1, the line cathode 2,
A suitable voltage is applied to the extraction electrode 3 to emit a sheet-like electron beam from the surface of the linear 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 amount of passage 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 bottom-shaped
The beam is deflected horizontally and vertically by the potential difference applied to adjacent conductive plates 19 and 20 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 22 to emit light. When a television screen is divided vertically and horizontally into a matrix to form a collection of 75 subdivisions, the electron beams separated as described above are associated with each subdivision, and the electron beams are By deflecting and scanning only each subsection, the entire image can be displayed on the screen. Furthermore, by controlling the RGB image signals corresponding to each pixel using the signal electrode 4, a televisual moving image can be reproduced.

Problems to be Solved by the Invention In the above-described configuration, there are the following problems in order to constantly obtain high-quality images.

As shown in Figure 3, 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
The direction is being determined.

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

When external vibrations are applied 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 produce simple harmonic motion as shown in FIG. It starts vibrating and continues to vibrate until it stops damping. When the M cathodes 2a to 22 vibrate, the amount of the electron beam passing through the through hole 11 of the extraction electrode described above changes periodically (not shown), and as a result, the brightness on the screen changes periodically. , it was not possible to stably obtain high-quality images.

In view of the above problems, the present invention provides high quality images in a stable manner at all times.

Means for Solving the Problems In order to solve the above problems, the present invention penetrates and installs a structure made of an insulating material and connecting two rings at both ends of every wire cathode. , and an insulated wire is passed through between the plurality of wire cathodes and the connecting portion of the two rings so as to be positioned perpendicularly to the plurality of wire cathodes, so that vibration of the wire cathodes can be prevented. It is.

Function The function of the present invention is that, as described above, there are two
By installing a structure in which two rings are connected through a penetrating structure, even if vibration of the line cathode occurs due to an external force on the image display device, the structure in which two rings are connected will immediately absorb the vibration of the line cathode. It absorbs energy and acts as a damper, stopping the vibration of the wire cathode and providing stable, high-quality images.

Further, the insulated wire prevents the structure in which the two rings are connected from moving in the direction in which the wire cathode is stretched.

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 wire cathodes, 31i, 31
The opening, 31 C, 3 is an insulating structure made by connecting two rings - hereinafter referred to as the W ring (ceramic is used in the example), and 32 is an insulated wire (50μ glass fiber in the example). ), 33 is the height regulation bar, 34
3 is a Y-direction positioning frame, and 35 is a wire cathode tension spring.

Reference numeral 36 denotes metal fittings for fixing both ends of the insulated wire 32. Although FIG. 1 only shows the structure of one end of the wire cathode 30, the other end also has the same shape. The line cathode 30 is ~
The height is regulated by a height regulating bar 33, and the positioning in the Y direction is further determined by a Y direction positioning frame 34. Each of the wire cathodes 30a, 30c, 30c, and 302 is stretched by being given tension by a wire cathode spring 35. Line cathode 30a, 310.31ha, W ring 31a for 3,
The holes in the two rings at 31st, 31c, and 3 are passed through.

Also, the insulated wire 32 is placed perpendicularly to the wire cathode 30 between the connecting portions 3, 370.37, 372 of the W ring and the wire cathodes 30, 30, 30, 302. It is installed through. Both the height regulation bar 33 and the Y-direction positioning frame 34 are made of insulators (ceramic is used in the embodiment)
Therefore, the line cathode is composed of 30 wires, 30 wires, and 30 wire cathodes.
C. 302 are each insulated. Also insulated wire 3
2 is fixed by fixing fittings 36 at both ends.

A case will be considered in which an external force such as vibration or shock is applied to an image display device having a line cathode extension section configured as described above. When an external force is applied, the wire cathodes 30a, 30c, 30c, and 302 begin to vibrate at their respective natural frequencies. At the same time as the vibration starts, the W rings 31A, 31A, 31A, and 312, which are penetrated and installed in the wire cathodes 30A, 30A, 30A, and 302, cause free movement, and the vibration energy of the wire cathode 30 is released. is converted into free kinetic energy of the W ring 31,
The vibration of the linear cathode 30 immediately damps and stops. Also,
The W ring 31 tries to move on the wire cathode 30 due to free movement, but the insulated wire 32 and the fixing metal fitting 3 that are passed between the W ring 31 and the wire cathode 30
6, the W ring 31 is positioned within the effective screen.
prevent intrusion. Further, in FIG. 1, the wire cathode stretched structure is arranged on a horizontal plane, but the above-mentioned vibration prevention effect and 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 when vibration of the wire cathode occurs due to an external force applied to the image display device, the W ring immediately absorbs the vibration energy and acts as a damper to stop the vibration of the wire cathode. It is possible to provide stable, high-quality images.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view of a line cathode strut part of an image display device according to an embodiment of the present invention, FIG. 2 is a partially exploded perspective view showing the configuration of a conventional image display device, and FIG. FIG. 4, which is a partially exploded perspective view of a line cathode extending portion of an image display device, is a vibration mode diagram of a line cathode in a conventional image display device. 29...Back electrode, 30 (30i to 302)
... Line cathode, 31 (31 I to 32 II)...
...Structure (W ring) 32...Insulated wire, 36...Fixing metal fittings.

Claims (1)

[Claims] A front glass container whose inner surface is coated with phosphor, a back container facing the front glass container, and a back electrode made of one conductive plate, a plurality of back electrodes in the space sandwiched between the back container and the front glass container. In an image display device equipped with a 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, an insulating material is provided at both ends of all of the plurality of line cathodes. A structure in which two rings are connected is passed through and installed, and an insulated wire is inserted between the plurality of wire cathodes and the connecting portion of the two rings. An image display device characterized in that the image display device is disposed through the penetrating device so as to be located perpendicular to the image display device.