JPH02242553A - Image display - Google Patents

Abstract

PURPOSE:To obtain stabilized high quality image by stopping vibration of wire cathodes by causing rings to move freely, and restraining the positions of the rings with an insulation wire and plural grooves. CONSTITUTION:Height of wire cathodes 30a-30d is restrained with a height control bar 34. Positions of the wire cathodes in the Y direction are determined with a positioning block 35. An insulation wire 32 perpendicular to the wire cathodes is passed through the hole of all rings 31a-31d through which the wire cathodes are passed and installed. The insulation wire 32 is further fit to plural restraint grooves 33a provided in insulation wire restraint bracket 33. If vibration is produced on the cathode wires due to external forces on an image display, the rings immediately move freely, absorb vibration energy, and stop the vibration of the wire cathodes. Furthermore, because the insulation wire 32 is fit to the plural position restraint grooves 33a, the positions of the rings are restrained. This prevents the rings from entering an effective screen are and provides stabilized high quality image.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device in video equipment. Conventional technology Conventionally, cathode ray tubes have been mainly used as color display I/vision image display elements. The depth was extremely long compared to the screen, making it impossible to produce a flat-screen television receiver. Therefore, El, display elements, plasma display elements, liquid crystal display elements, and the like have been developed as display elements on a flat panel, but 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 on par with cathode ray tubes on a flat panel device using electron beams, the screen was divided into matrix-like sections without any gaps.
There is an image display device that deflects and scans an electron beam in each section to cause a phosphor 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. 2 shows the configuration of a conventional image display device.

In Figure 2, 1 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 container9.1
0 and the inside of the container is evacuated. The 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 line cathodes 2 (here, 2-2 Only two to four trees are shown). These wire cathodes 2 are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material. The back electrode 1 is made of a flat plate-shaped N electrical material, and is provided in parallel to the line cathodes 2a-22.

The extraction electrode 3 is made from a conductive plate that faces the back electrode 1 via the line cathodes 2a to 22, and has a row of through holes 11 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Become. Although the through holes 11 are circular in the embodiment, they may be oval or rectangular, or may be slint-shaped. It consists of a row of vertical force n long and thin conductive plates 12 arranged in plurality, each conductive plate having 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 may be a vertically elongated slit. The focusing electrode 5 is made of a conductive plate having through holes 14 at positions facing each of the through holes 13 of the signal electrode 4 . The shape of the through hole 14 may be circular, oval, or slit-like. The focusing electrode 6 has a vertically connected slit hole 15 at a position facing the through hole 14 of the focusing electrode 5 . The shape of the slit hole 15 may be round, oval, or rectangular. The horizontal deflection electrode 8 is composed of two conductive plates 16 and 17 connected by comb-shaped ends that are interlocked with each other at an appropriate interval on the same plane, and is made between the conductive plates 16 and 17. The space 18 faces the through slit hole 15 of the focusing electrode 6. The vertical deflection electrode 8 consists of two conductive plates 19.20 connected at their ends as shown in FIG.
They are arranged in the same plane and interlocked with each other at appropriate intervals. The screen 21 is constructed by coating the inner surface of a glass container 9 with a phosphor 22 that emits light when irradiated with an electron beam, and adding a metal back N (not shown) thereon. In addition, the above-mentioned extraction electrode 3, signal electrode 4,
The focusing electrodes 5 and 6, the horizontal deflection electrode 7, and the vertical deflection electrode 8 are each bonded with 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 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 23
The passing amount 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 formed
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, a high voltage (for example, l) is applied to the metal layer of the screen 21.
0 KV) is applied, and the electron beam is accelerated to high energy and collides with the metal bank, causing the phosphor to emit light.

When a television screen is divided vertically and horizontally into a matrix to form a collection of subdivisions 25, the electron beams separated as described above are made to correspond to each subdivision, and the electron beams are divided into each subdivision. 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, there are the following problems in order to constantly obtain high-quality images.

As shown in FIG. 3, the wire cathode 2 is a thin wire rod with a diameter of 10 μm, and its height is regulated by height regulating bars 26 at both ends (only one side is shown), and in the Y direction by a Y direction positioning frame 27. is being positioned. Furthermore, tension is applied to both sides or one side by springs 28 attached to the Y-direction positioning frame 27.

When external vibrations are applied to the image display device equipped with the wire cathode 2 positioned and stretched in this manner, the wire cathode 2 starts to vibrate mainly in simple harmonic motion and ends attenuation, as shown in FIG. It continues to shake until When the line cathode 2 vibrates, the amount of the electron beam flow (23 in Figure 2) passing through the through hole (11 in Figure 2) of the extraction electrode (3 in Figure 2) changes periodically (not shown). However, the brightness on the screen changed periodically, making it impossible to obtain a stable, high-quality image.

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

Means for Solving the Problems In order to solve the above problems, the present invention provides a method for suppressing vibration of the wire cathode by penetrating and installing one or more rings in the wire cathode and allowing the rings to move freely. and by passing an insulated wire through the inner hole of the ring so as to be positioned perpendicular to the line cathode, and further fitting the insulated wire into a plurality of positioning grooves,
This makes it possible to control the position of the ring.

Function The function of the present invention is that by penetrating and installing a ring on the line cathode as described above, when vibration of the line cathode occurs due to an external force to the image display device, the ring immediately causes free movement and the vibration is suppressed. The vibration of the wire cathode is stopped by absorbing energy, and an insulated wire is passed through the inner hole of the ring so as to be perpendicular to the wire cathode, and the insulated wire is inserted into a plurality of positioning grooves. By fitting, the position of the ring is controlled, the ring is prevented from entering the effective screen, and a stable, high-quality image is provided.

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. 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 cathodes 30 (30i to 302) have their heights regulated by height regulating bars 34, and are further positioned in the Y direction by a Y direction positioning frame 35. Each of the wire cathodes 30a, 30c, 30c, and 3 is tensioned by a wire cathode spring 36. In addition, rings 31a, 31031c, and 3 (an inorganic heat-resistant substance) are penetrated and installed in the linear cathodes 30a, 30c, 30c, and 302, and
1a, 310, 31c.

Insulated wires 32 (ceramic wires with a diameter of 15 // m were used in the example, but there are no restrictions on the diameter or the number of wires) are inserted into all the inner holes of the wire cathode 3.
0, and the insulated wire 32 is further provided on an insulated wire regulating fitting 33. It is fitted into a plurality of restriction grooves 33a.

At both ends of the insulated wire 32, U-shaped insulated wire prevention parts 33b provided on the insulated wire regulating fitting 33 are arranged to prevent the insulated wire 32 from being pulled out.

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 front cathodes 30, 30, 30, 3
02 start vibrating at their respective natural frequencies. At the same time as the vibration starts, the line cathode 30 and 130 ports are connected.

The ring 31-3 penetrated and installed in 30-3 and 30-2
10.31C, 3 causes free movement, and the line cathode 3
The vibration energy of 0 is converted into free kinetic energy of the ring 31, and the vibration of the line cathode 30 is immediately attenuated and stopped. Further, the ring 31 moves on the wire cathode 30 with free movement, but the insulated wire 32 and the regulating groove 33a penetrated through the inner hole of the ring 31
The position of the ring 31 is regulated by
prevent intrusion. Furthermore, in FIG. 1, the linear cathode stretched structure is arranged on a horizontal plane, but even if it is arranged on a vertical plane or at any angle, the effect of preventing the vibration of the linear cathode 30 and regulating the position of the ring 31 will be the same. The height dimension of the regulation groove 33a is set so that it can be held. Note that 29 indicates a back electrode.

In addition to the effects of the invention, according to the present invention, even if vibration of the linear cathode occurs due to an external force applied to the image display device, the ring immediately causes free movement to absorb the vibration energy, thereby suppressing the vibration of the linear cathode. At the same time, the position of the ring is regulated by an insulated wire passed through the circular hole of the ring and a plurality of grooves, which prevents the ring from entering the effective screen, resulting in stable and high quality. It is capable of providing images.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view of a line cathode stretching section 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. 3 is a conventional FIG. 4 is a partially exploded perspective view of a line cathode extending portion of an image display device, and FIG. 4 is a vibration mode diagram of a line cathode in a conventional image display device. 29...Back electrode, 30i to 302...
・Line cathode, 31-3...Ring, 32...
...Insulated wire, 33...Insulated wire regulation fitting, 33a...Regulation groove, 33b...
...Insulated wire removal prevention part, 34...Height regulation bar, 35...Y direction positioning frame, 36.
... Line cathode wire.

Claims (1)

[Claims] A front glass container whose inner surface is coated with phosphor, a back container facing the front glass container, and a plurality of back electrodes made of a single conductive plate in the space sandwiched between the back container and the front glass container. In an image display device equipped with a main 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, both ends of all the plurality of line cathodes are provided. , one or more rings are penetrated and installed, an insulated wire is passed through the inner hole of the ring so as to be perpendicular to the plurality of wire cathodes, and the insulated wire is inserted into a plurality of positional guides. An image display device that is fitted into a recognition groove.