JP2778089B2 - Image display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image display device in a video device.

2. Description of the Related Art Conventionally, a cathode ray tube is mainly used as a color television image display element. there were. Therefore, EL display elements, plasma display elements,
Liquid crystal display devices have been developed, but none of them have sufficient performance such as luminance, contrast, and color reproducibility. Therefore, in order to display a high-quality image comparable to a cathode-ray tube on a flat panel device using an electron beam, the image on the screen is divided into matrix-like sections without any gap, and the electron beam is applied to each section. 2. Description of the Related Art There is an image display apparatus that emits phosphors by deflection scanning to form a color television image as a whole.

Hereinafter, an example of the above-described conventional image display device will be described with reference to the drawings.

FIG. 2 shows the configuration of a conventional image display device. In FIG. 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, 4 and 5 are focusing electrodes, 7 is a horizontal deflection electrode and 8 is a vertical deflection electrode. Yes, these components are housed in glass containers 9 and 10, and the inside of the containers is evacuated. The linear cathode 2 is stretched in the horizontal direction so as to generate an electron flow uniformly distributed in the horizontal direction. A plurality of such linear cathodes 2 (here, 2a to 2a) are provided at appropriate intervals. (Only four of them are shown). These line cathodes 2 are formed, for example, by coating 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 with the linear cathodes 2a to 2d. The extraction electrode 3 is opposed to the back electrode 1 via the linear cathodes 2a to 2d and has through holes 11 provided at appropriate intervals in the horizontal direction.
Are arranged on a horizontal line facing each line cathode. The through-holes 11 are circular in the embodiment, but may be elliptical or rectangular, and may be slit-shaped. The signal electrode 4 is located at a position facing each of the through-holes 11 in the extraction electrode 3 at a predetermined interval. It is composed of a plurality of rows of vertically long conductive plates 12 arranged in each direction. Each conductive plate has a similar through hole 13 at a position facing the through hole 11 of the extraction electrode 3. The shape of the through-hole 13 may be elliptical or rectangular, or may be a vertically elongated slit. The focusing electrode 5 is formed of a conductive plate having a through hole 14 at a position facing each of the through holes 13 of the signal electrode 4. The shape of the through hole 14 may be a circle, an ellipse, or a slit. The focusing electrode 6 has a slit hole 15 vertically connected to a position facing the through hole 14 of the focusing electrode 5.
The shape of the slit hole 15 may be a round hole, an ellipse, or a rectangular shape. The horizontal deflecting electrode 8 is composed of two conductive plates 16 and 17 which are connected to each other on the same plane at appropriate intervals with interdigitated ends and are formed between the conductive plates 16 and 17. The space 18 faces the through slit 15 of the focusing electrode 6. As shown in FIG. 2, the vertical deflection electrode 8 has conductive plates 19 and 20 connected at the ends, that is, two comb-tooth conductive plates 19 and 20 are meshed with each other at appropriate intervals on the same plane. It consists of a configuration. The screen 21 is formed by applying a phosphor 22 that emits light by irradiation with an electron beam to the inner surface of the glass container 9 and adding a metal back layer (not shown) thereon. The extraction electrode 3, the signal electrode 4, the focusing electrodes 5 and 6, the horizontal deflecting electrode 7, and the vertical deflecting electrode 8 are respectively joined by an insulating adhesive (not shown), and are integrally formed. An electrode block 24 is formed.

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

First, the line cathode 2 is heated by supplying a heater current to facilitate electron emission. In a heated state, an appropriate voltage is applied to the back electrode 1, the line cathode 2, and the extraction electrode 3, and 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 pieces by the through-holes 11 of the extraction electrode 3 to form a large number of electron beam flows 23. This electron beam current 23
According to the video signal applied to the signal electrode 4, the passing amount is individually adjusted by the signal electrode 4 for each electron beam flow.
Next, the electron beam passing through the signal electrode 4 is
After being focused and formed by the electrostatic lens effect of the through holes 14 and 15 of 6, the potential difference given to the adjacent conductive plates 16 and 17 of the horizontal deflection electrode 7 and the adjacent conductive plates 19 and 20 of the vertical deflection electrode 8 Is deflected horizontally and vertically. Further screen 21
A high voltage (for example, 10 KV) is applied to the metal back layer, and the electron beam is accelerated to high energy and collides with the metal back to cause the phosphor to emit light.

Divide the television screen vertically and horizontally in a matrix,
When an aggregate of subsections 25 is formed, the electron beam separated as described above is made to correspond to each subsection, one by one, and the electron beam is deflected and scanned only in each subsection, thereby forming a full screen. Can be projected on the screen. In addition, by controlling the RGB video signal corresponding to each pixel by the signal electrode 4, a television moving image can be reproduced.

Problems to be Solved by the Invention In the above configuration, in order to always obtain a high-quality image, there are the following problems.

As shown in FIG. 3, the wire cathode 2 is a thin wire having a diameter of 10 μm, and both ends (only one side is shown) of which height is regulated by a height regulating bar 26, and a Y-direction positioning frame 27 is provided in a Y-direction. Is positioned. Further, tension is applied to both sides or one side by a spring 28 attached to the Y-direction positioning frame 27.

When an external vibration is applied to the image display apparatus provided with the linear cathode 2 positioned and stretched in this manner, the linear cathode 2 starts the vibration mainly including the simple vibration as shown in FIG. Keep shaking until When the linear cathode 2 vibrates, the amount of the electron beam flow (23 in FIG. 2) passing through the through hole (11 in FIG. 2) of the extraction electrode (3 in FIG. 2) changes periodically (not shown). As a result, the luminance on the screen periodically changed, and a high-quality image could not be stably obtained.

The present invention has been made in view of the above problems, and provides an image display device capable of always stably displaying a high-quality image.

Means for Solving the Problems To solve the above problems, the present invention suppresses the vibration of the linear cathode by penetrating and installing one or more rings on the linear cathode and allowing the rings to freely move. Position control of the ring by allowing an insulated wire to penetrate the inner hole of the ring so as to be positioned perpendicular to the wire cathode, and further fitting the insulated wire into a plurality of position regulating grooves. Is made possible.

Operation The operation of the present invention is as described above, by penetrating and installing a ring on the linear cathode, when the linear cathode vibrates due to an external force applied to the image display device, the ring immediately causes free motion, By absorbing energy, the vibration of the line cathode is stopped, and an insulated wire is passed through the inner hole of the ring so as to be positioned perpendicular to the line cathode, and the insulated wire is fitted into a plurality of position regulating grooves. By controlling the position of the ring, the position of the ring is controlled, the intrusion of the ring into the effective screen is prevented, 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 linear cathode bridge of an image display device according to an embodiment of the present invention. FIG. 1 shows only the structure of one end of the linear cathode 30, but the other end has the same shape. The height of the linear cathodes 30 (30a to 30d) is regulated by a height regulating bar 34, and is further positioned in the Y direction by a Y direction positioning frame 35. Each of the linear cathodes 30a, 30b, 30c, 31d is tensioned by a linear cathode spring 36 and is stretched. In addition, the line cathode 30
Rings 31a, 31b, 31c, 31d (inorganic and heat-resistant substances) penetrate and are installed in a, 30b, 30c, 30d, and the rings 31a, 31b, 31c are provided. Insulating wire 32 (one ceramic wire with a diameter of 15 μm was used in the embodiment, but there is no limitation on the diameter and number of wires)
Is penetrated so as to be perpendicular to the linear cathode 30, and the insulating wire 32 is provided on an insulating wire regulating bracket 33. It is fitted in the plurality of regulating grooves 33a. At both ends of the insulation wire 32, U-shaped insulation wire removal prevention portions 33b provided on the insulation wire restricting bracket 33 are arranged to prevent the insulation wire 32 from coming off.

Consider a case in which an external force such as vibration or impact is applied to the image display device having the linear-cathode span configured as described above. When an external force is applied, the front cathodes 30a, 30b, 30c, 30d start oscillating at their natural frequencies. Simultaneously with the start of vibration, the rings 31a, 31b, 31c, 31d penetrating and installed in the linear cathodes 30a, 30b, 30c, 30d cause free movement, and the vibration energy of the linear cathode 30 Is converted into free kinetic energy of the ring 31, and the vibration of the linear cathode 30 is immediately attenuated and stopped. In addition, the ring 31 moves on the linear cathode 30 with free movement, but the position is regulated by the insulating wire 32 and the regulating groove 33a penetrated through the inner hole of the ring 31, and the ring is moved within the effective screen. The ring 31 is prevented from entering. Further, in FIG. 1, the wire-cathode spanning structure is arranged on the horizontal plane. However, regardless of the arrangement on the vertical plane and at any angle, the effect of preventing vibration of the wire cathode 30 and regulating the position of the ring 31 can be obtained. The height dimension of the restricting groove 33a is set so that the height can be held. 29 indicates a back electrode.

As described above, according to the present invention, even when vibration of the linear cathode due to external force applied to the image display device occurs, the ring immediately causes free motion to absorb vibration energy,
While stopping the vibration of the line cathode, the position of the ring is regulated by an insulating wire and a plurality of grooves penetrated through the inner hole of the ring, it is possible to prevent the intrusion of the ring into the effective screen, It is possible to provide a stable high-quality image.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a line cathode stretching portion of an image display device according to an embodiment of the present invention, FIG. 2 is a partially exploded perspective view showing a configuration of a conventional image display device, and FIG. FIG. 4 is a partial exploded perspective view of a line cathode stretching portion of the image display device, and FIG. 4 is a vibration mode diagram of the line cathode in the conventional image display device. 29 ... Back electrode, 30a to 30d ... Line cathode, 31a to 31d ...
… Ring, 32… Insulated wire, 33… Insulated wire restricting bracket, 33a… Regulating groove, 33b… Insulated wire pull-out prevention part, 34… Height regulating bar, 35… Y direction positioning frame, 36 ... Wire cathode spring.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-171035 (JP, A) JP-A-2-183951 (JP, A) JP-A-2-54840 (JP, A) (58) Survey Field (Int. Cl. ⁶ , DB name) H01J 31/12 H01J 29/04

Claims (1)

(57) [Claims] 1. A front glass container having an inner surface coated with a phosphor, a rear container facing the front glass container, and a space interposed between the rear container and the front glass container.
An image display device comprising a back electrode made of one conductive plate, a plurality of linear cathodes, an extraction electrode and a signal electrode, a focusing electrode, a horizontal deflection electrode and a vertical deflection electrode made of one or more conductive plates. One or a plurality of rings are penetrated and installed at both ends of all of the plurality of linear cathodes, and an insulated wire is penetrated through an inner hole of the ring so as to be positioned perpendicular to the plurality of linear cathodes. An image display device, wherein the insulating wire is fitted in a plurality of position regulating grooves.