JPH0349136A - Image display device - Google Patents

Abstract

PURPOSE:To secure the relative position relation between a height regulating bar and an insulating wire regulating metal plate and reduce assembling man- hours by integrally forming the height regulating bar and the insulating wire regulating metal plate. CONSTITUTION:A height regulating bar 33 is fitted and fixed by an insulating wire regulating metal plate integrated with a height regulating bar fitting metal 37. The relative position relation between the intersection between an insulating wire 31 and a linear cathode 2 and the height regulating bar 33 is determined by the component size precision of the metal plate 37 independently from the assembling size precision. Assembly precision is improved, the metal plate 37 is fitted to a back electrode 1, the bar 33 is fitted and fixed to the electrode 1, thus assembly man-hours can be reduced.

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 have a much longer depth than the screen, making it impossible to manufacture flat-screen television receivers. Ta. 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 of Brown Sugagasa on a flat panel device using electron beams, the screen was divided into matrix-like sections without gaps, and the electron beam was applied to each section. We have proposed an image display device that makes a phosphor emit light through deflection scanning, and forms 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 glass containers 9, 10.
It is stored in a container and the inside of the container is evacuated. line cathode 2
is stretched in the horizontal direction so as to generate an electron flow uniformly distributed in the horizontal direction, and a plurality of wire cathodes 2 (herein, 2-2 to 2-4) are arranged vertically at appropriate intervals. (shown only on trees). These line cathodes are
For example, it is constructed by coating the surface of a tungsten wire with an oxide cathode material. 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 is made of a conductive plate that faces the back electrode I via the line cathodes 2a-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.

Although the through hole 11 is circular in the embodiment, it may be oval or rectangular, or may be slit-shaped. The signal electrode 4 consists of a row of vertically elongated conductive electrodes vi, 12 arranged at predetermined intervals in positions facing each of the through holes 11 in the extraction electrode 3, and in each conductive plate, an extraction electrode A similar through hole I3 is provided at a position opposite to the through hole 11 of No. 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 extends through the signal electrode 4
It is made of a conductive plate having through holes I4 at positions facing each of the fi holes 13. The shape of the through hole 14 may be a circle, an ellipse, or a slit. The focusing electrode 6 has a vertically connected slit hole I5 at a position opposite to 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 7 is composed of two conductive plates 16 and 17 connected by m-toothed ends that are interlocked with each other on the same plane with an appropriate interval between the conductive plates 16. The space 18 created between +7 faces the through slit hole 15 of the focusing electrode 6. The vertical deflection electrode 8 includes two conductive plates 19.20 connected at their ends, ie, two comb-shaped conductive plates 19.2, as shown in FIG.
0 are arranged on the same plane and are interlocked with each other at appropriate intervals. The screen 2 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 layer (not shown) thereon. In addition, the aforementioned drawer@pole 3, signal electrode 4
, focusing electrodes 5 and 6, horizontal deflection electrode 7, 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 explained in detail.

First, a heater current is applied to the wire cathode 2 to heat it to facilitate electron emission. Back electrode 11. in heated state. line cathode 2
, an appropriate voltage is applied to 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 parts by the through hole 1 of the extraction electrode 3, and becomes a large number of electron beam streams 23. The amount of passage of each electron beam stream 23 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,
After being formed, the adjacent conductive plates 16.1 of the horizontal deflection electrode 7
It is deflected horizontally and vertically by the potential difference applied to adjacent conductive plates 19 and 20 of vertical deflection electrode 7 and vertical deflection electrode 8 . Furthermore, the metal back layer of the screen 21 is applied with a high voltage (for example, I
CIKV) is applied, and the electron beam is accelerated to high energy and collides with the metal back, causing the phosphor 22 to emit light.

By associating the electron beams separated as described above one by one and deflecting and scanning the electron beams only within each subdivision, the entire image can be displayed on the screen. Furthermore, 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 FIG. 3, the wire cathode 2 is a thin wire with a diameter of several tens of μm, and its height is regulated by height regulating bars 33 at both ends (one side is not shown), and the Y direction positioning frame 34 is used to control the height of the wire cathode 2. The direction is being determined. Furthermore, the insulated wire 31 prevents the wire cathode 2 from vibrating due to external vibrations.

Here, the height regulation bar 33 and the insulated wire regulation metal plate 32
are respectively attached and fixed to the back electrode l with a unit intersection of several tens of μm, and the mutual positional relationship between the height regulating bar 33 and the insulated wire regulating metal plate 32 is also required to have a unit intersection of several tens of μm. . Here, the height regulating bar 33 and the insulated wire regulating metal plate 32 are mounted and fixed using respective mounting jigs, which makes it difficult to ensure a mounting value of 1 accuracy and requires a large amount of assembly man-hours. However, it has been impossible to obtain a stable, high-quality, and inexpensive image display device.

In view of the above problems, the present invention provides means for obtaining a stable, high-quality, and inexpensive image display device.

Means for Solving the Problems In order to solve the above problems, the present invention integrates a height regulating bar and an insulated wire regulating metal plate to ensure a mutual positional relationship between the height regulating bar and the insulated wire regulating metal plate. At the same time, the number of assembly steps can be reduced.

Function The function of the present invention is that, as described above, by integrating the height regulating bar and the insulated wire regulating metal plate, the mutual positional relationship between the height regulating bar and the insulated wire regulating metal plate can be maintained with component dimensional accuracy. It is now possible to easily ensure assembly accuracy, as it is no longer affected by assembly dimensional accuracy, and mounting and fixing to the back electrode can be completed with one jig adjustment, reducing assembly man-hours and making it more stable. The present invention provides a high quality and inexpensive image display device.

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 in an embodiment of the present invention. 1 is the back electrode, 2
A, 20.2 C, 22 is a wire cathode, 31 is an insulated wire,
33 is a height regulating bar, 34 is a Y direction positioning frame body, 35
37 is a wire cathode spring, and 37 is an insulated wire regulating metal plate integrated with a height regulating bar mounting bracket. Although FIG. 1 only shows the structure of one end of the wire cathode 2, the other end also has the same shape. The height regulation bar 33 is mounted and fixed by an insulated wire regulation metal plate 37 integrated with a height regulation bar mounting bracket.

In the image display device having the line cathode stretching section configured as described above, the mutual positional relationship between the intersection of the insulated wire 31 and the line cathode 2 and the height regulation bar 33 is determined by the height regulation bar attachment point. It is determined by the component dimensional accuracy of the metal fitting-integrated insulated wire regulating metal plate 37 and is not affected by the assembly dimensional accuracy, so the overall assembly accuracy can be improved. At the same time, the height regulating bar mounting bracket integrated insulated wire regulating metal plate 37 is attached to the rear [il]
3 is also attached and fixed to the back electrode 1, so the number of assembly steps is also reduced.

Effects of the Invention As described above, according to the present invention, the mutual positional relationship between the height regulation bar and the intersection of the insulated wire and the wire cathode is determined by the component accuracy of the insulated wire regulation metal plate integrated with the height regulation bar mounting bracket. In addition, the height regulation bar can be easily secured by simply attaching and fixing the height regulation bar to the back electrode at the same time as installing and fixing the insulated wire regulation metal plate with integrated height regulation bar mounting bracket to the back electrode. The number of man-hours can be reduced, and a stable, high-quality, inexpensive image display device can be obtained.

[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. 3 is a partially exploded perspective view of a line cathode extending portion of the image display device. 1...Back electrode, 31...Insulated wire, 33...Height regulation bar, 34...
Y-direction positioning frame body, 35... wire cathode suspension spring, 37... height regulating bar mounting bracket integrated insulated wire regulating metal plate.

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 and 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, the height regulating bar of the plurality of line cathodes and vibration prevention are provided. An image display device characterized by being integrated with an insulated wire regulating metal plate.