JP2794773B2 - 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 screen on the screen is divided into matrix-shaped sections without gaps, 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. 7 shows the configuration of a conventional image display device. In FIG. 7, 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. These components are housed in glass containers 9 and 10, and the inside of the containers is evacuated. The linear cathodes 2 are stretched in the horizontal direction so as to generate an electron current uniformly distributed in the horizontal direction. A plurality of such linear cathodes 2 (here, 2a-2) 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 plate-shaped conductive material, and is provided in parallel with the linear cathodes 2-2. The extraction electrode 3 is opposed to the back electrode 1 via the linear cathodes 2 and 2 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 the through-hole 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 deflection electrode 8 is a conductive plate connected by two comb-teeth-shaped ends that are meshed with each other on the same plane at appropriate intervals.
A space 18 constituted by 16 and 17 and formed between the conductive plates 16 and 17 is opposed to the through slit 15 of the focusing electrode 6. As shown in FIG. 7, the vertical deflection electrode 8 is composed of conductive plates 19 and 20 connected at the ends, ie, two comb-shaped conductive plates.
19 and 20 are configured to be meshed with each other on the same plane at appropriate intervals. The screen 21 has a structure in which a phosphor 22 that emits light by irradiation 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. 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 the subsections 75, the electron beams separated as described above for each subsection are made to correspond one by one, and the electron beam is deflected and scanned only in each subsection,
The entire 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-described configuration, there are the following problems in order to always obtain a high-quality image.

As shown in FIG. 8, the wire cathode 2 is a thin wire having a diameter of several tens of μm, and has a height regulating bar 26 at both ends (only one side is shown).
And the height is regulated, and the Y-direction positioning frame 27 is used for positioning in the Y-direction. 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 having the linear cathode 2 positioned and stretched in this way, 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 through hole (11 in FIG. 7) of the extraction electrode (3 in FIG. 7) described above.
The amount of the electron beam flow (23 in FIG. 7) passing through the screen periodically changes (not shown), and as a result, the brightness on the screen changes periodically to obtain a stable high-quality image. I could not do it.

The present invention has been made in view of the above circumstances, and provides a high-quality image in a stable manner at all times by preventing vibration of a linear cathode.

Further, a second object of the present invention is to provide an image display device in which a line cathode has a further improved image stabilizing effect.

Further, a third object of the present invention is to provide an image display device having a vibration-proof effect of a line cathode and a simplified manufacturing method.

A fourth object of the present invention is to provide a structure of components of the vibration isolator.

Means for Solving the Problems According to a first aspect of the present invention, an insulating thin plate is attached in a ring shape to every one or both ends of all of a plurality of linear cathodes, An image display device having a plate-shaped or rod-shaped stopper arranged to restrict lateral movement.

The second invention of the present invention is an image display device comprising an insulating thin plate attached to one end or both ends of all of a plurality of linear cathodes alternately in a ring shape.

According to a third aspect of the present invention, there is provided an image display device comprising: a hole provided in the vicinity of the center of the insulating thin plate; and a plate-shaped or rod-shaped stopper provided on the back electrode so as to pass through the hole. .

A fourth invention of the present invention provides the above-mentioned insulating thin plate,
This is an image display device using a ceramic-metal connecting plate.

Operation The operation of the first invention of the present invention is as follows. By attaching an insulating thin plate to the line cathode in a ring shape as described above, even if the line cathode vibrates due to an external force applied to the image display device, the operation immediately proceeds. The ring-shaped insulating thin plate vibrates on the linear cathode to absorb vibration energy of the linear cathode, acts as a damper, stops the vibration of the linear cathode, and provides a stable and high-quality image.

In addition, by forming the insulating thin plate into a ring shape that wraps two wire cathodes at the same time, it is possible to prevent the ring-shaped insulating thin plate from coming off from the insulating property and to have a simple structure that only requires bending the thin plate. it can. Further, the plate-shaped or rod-shaped stopper attached to the back electrode can prevent the ring-shaped thin plate from moving in the direction parallel to the linear cathode.

The effect of the second invention of the present invention is that, by alternately attaching thin insulating plates in a ring shape to one end or both ends of all of a plurality of linear cathodes, the image display device can be moved in all directions. Even in a tilted state, the ring-shaped thin plate always comes into contact with all of the line cathodes to enhance the vibration isolation effect.

The function of the third invention of the present invention is that a hole is provided in the vicinity of the center of the insulating thin plate, and a plate-shaped or rod-shaped stopper is provided on the back electrode so as to pass through the hole. While maintaining the anti-vibration effect on the line cathode, when assembling the image display device, insert an insulating thin plate hole into the plate-shaped or rod-shaped stopper provided on the back electrode, and install the insulating A simple manufacturing method such as bending a thin plate into a ring shape is possible.

The effect of the fourth invention of the present invention is that the insulating thin plate is made of a metal-ceramic-metal connecting plate to keep the insulation of the adjacent line cathodes and to make it easy to bend when forming a ring shape. That is.

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

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 shows a structure of a linear cathode support portion of an image display device according to a first embodiment of the present invention. 30 b, 30 b,
30C and 30D are line cathodes, 31 is a height regulating bar, 32 is a Y direction positioning frame, 33 is a line cathode extension spring, and 34 is a back electrode. FIG. 1 shows only the structure of one end of the linear cathode 30, but the other end has the same shape. Line cathode 30
Is regulated in height by a height regulating bar 31 and further positioned in the Y direction by a Y direction positioning frame 32. Each of the linear cathodes 30a, 30b, 30c, and 30d is tensioned by a linear cathode tension spring 33 attached to a Y-direction positioning frame 32 and stretched. Here the height regulation bar 31,
Since the Y-direction positioning frame 32 is made of an insulator such as ceramic, the linear cathodes 30a, 30b, 30c, and 30d are insulated from each other. Further, as shown in FIG.
A, 30B, 30C, 30D and 30B, 30C and 30 at the end
D. Insulating thin plates (every metal thin plate coated with ceramic is used in the embodiment, but an insulating material such as a ceramic thin plate may be used).
Are attached in a ring shape, and the insulating thin plate 35 is
A rod-shaped stopper 36 is disposed on the back electrode 34 so as not to move in a direction parallel to the direction shown in FIG. Although the rod-shaped stopper 36 is used in the embodiment, a plate-shaped stopper may be used.

Consider a case in which an external force such as vibration or impact is applied to an image display device having a linear-cathode stretching portion configured as in this embodiment. When an external force is applied, the linear cathodes 30a, 30b, 30c, and 30d start oscillating at their natural frequencies. Simultaneously with the start of the vibration, the insulating thin plate 35 in contact with the linear cathodes 30a, 30b, 30c, 30d absorbs the vibration energy of the linear cathode 30 and starts to vibrate. That is, when an external force is applied to the image display device, the linear cathode 30 starts vibrating at each natural frequency, but the vibration energy is immediately converted into free vibration energy of the ring-shaped insulating thin plate 35, and the linear cathode 30 is vibrated. The 30 vibrations immediately decay and stop.

Further, the stopper 36 attached on the back electrode 34 can prevent the insulating thin plate 35 from moving in the direction parallel to the linear cathode 30.

Further, in the present invention, by arranging the insulating thin plate 35 in a ring shape so as to enclose two wire cathodes at the same time, it is possible to easily assemble only by bending the insulating thin plate part 45 as shown in FIG. At the same time, the insulating thin plate 35 can be prevented from falling off from the linear cathode 30. Further, the stopper 36 can be arranged in the middle of the two linear cathodes, so that the structure can be simplified and the stopper can be prevented from hindering the free vibration of the insulating thin plate.

Embodiment 2 FIG. 2 shows the structure of a linear cathode stretching portion of an image display device according to a second embodiment of the present invention. In the figure, the same components as those in FIG.

1 is different from FIG. 1 in that an insulating thin plate 37 is used in addition to an insulating thin plate 35 used as a vibration absorbing damper for the linear cathode 30 and further alternately arranged for every two linear cathodes 30. It is the point which attached.

According to this embodiment, the line cathode 30 and any of the insulating thin plates (35, 37) are placed in the horizontal state in FIG. However, the contact is inevitable, and the above-described vibration prevention effect can be surely ensured.

Third Embodiment FIG. 3 shows the structure of a linear cathode support of an image display device according to a third embodiment of the present invention. In the figure, the same components as those in FIG.

1 differs from FIG. 1 in that a hole 39 is provided in the center of an insulating thin plate 38 extending over two linear cathodes, and a rod-shaped stopper 40 is inserted through the hole 39 to form a back electrode 34.
It is arranged on the top. In the embodiment, the stopper 40 has a rod shape, but may have a plate shape. According to the present embodiment, while assembling the image display device while maintaining the vibration insulating effect of the line cathode 30 by the insulating thin plate 38 described above, the insulating cathode 38 is provided on the back electrode 34 as shown in FIG. Rod shaped stopper
A simple manufacturing method is possible in which the hole 39 of the insulating thin plate 38 is inserted into 40, and the insulating thin plate 38 is bent into a ring shape after the linear cathode 30 is stretched.

Embodiment 4 FIG. 4 shows the structure of an insulating thin plate according to a fourth embodiment of the present invention. As shown in FIG. 4, the insulating thin plate 41 has a structure composed of a connecting plate of metal 42-ceramic 43-metal 44.

According to the present embodiment, while maintaining the insulation of the adjacent line cathode,
When it is formed into a ring shape, it can be easily bent.

Effect of the Invention According to the first aspect of the present invention, the insulating thin plate is attached to the line cathode in a ring shape, so that even if the line cathode vibrates due to an external force applied to the image display device, the ring cathode is immediately formed. When the insulating thin plate vibrates on the linear cathode, it absorbs the vibration energy of the linear cathode, acts as a damper, attenuates and stops the vibration of the linear cathode, and provides a stable and high-quality image. In addition, by forming the insulating thin plate into a ring shape so as to wrap two line cathodes at the same time, the ring-shaped insulating thin plate can be prevented from coming off from the line cathode,
A simple structure can be achieved simply by bending a thin plate. Further, the bar-shaped stopper attached on the back electrode can prevent the ring-shaped thin plate from moving in the direction parallel to the linear cathode.

According to the second aspect of the present invention, the image display device is tilted in all directions by alternately attaching insulating thin plates in a ring shape to one end or both ends of all of the plurality of linear cathodes. Even in the state, the ring-shaped thin plate is always in contact with all the line cathodes, so that the vibration isolating effect can be ensured.

According to the third aspect of the present invention, a hole is provided in the vicinity of the center of the insulating thin plate, and a rod-shaped stopper is provided on the back electrode so as to pass through the hole. While maintaining the anti-vibration effect, when assembling the image display device, insert the hole of the insulating thin plate into the rod-shaped stopper provided on the back electrode, and bend the insulating thin plate after stretching the wire cathode, and form a ring shape A simple manufacturing method such as

According to the fourth aspect of the present invention, since the insulating thin plate is a metal-ceramic-metal connecting plate, it is possible to maintain the insulation of the adjacent line cathodes and easily bend the ring cathode when forming the ring cathode.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a linear cathode spanning portion of an image display device according to a first embodiment of the present invention, and FIG.
FIG. 3 is a partially exploded perspective view of a line-cathode stretching portion of the image display device according to the third embodiment; FIG. 3 is a partially exploded perspective view of the line-cathode stretching portion of the image display device according to the third embodiment of the present invention; FIG. 5 is a view showing a structure of an insulating thin plate of an image display device according to a fourth embodiment of the present invention, FIG. 5 is a view showing a manufacturing method according to the first embodiment of the present invention, and FIG. FIG. 7 is a partial exploded perspective view showing the structure of a conventional image display device, and FIG. 8 is a partial exploded view of a line cathode spanning portion of the conventional image display device. FIG. 9 is a perspective view showing a vibration mode of a linear cathode in a conventional image display device. 30 (30 a to 30 b) ... wire cathode, 31 ... height regulation bar, 32
…… Y direction positioning frame, 33… Wire cathode extension spring, 34…
… Back electrode, 35… insulating thin plate, 36… stopper,
37 …… Insulating thin plate, 38 …… Perforated insulating thin plate, 39…
... holes, 40 ... through-hole stoppers, 41 ... insulating thin plate consisting of connecting plates, 42 ... metal, 43 ... ceramic, 44 ...
metal.

Continuation of the front page (72) Inventor Haruo Kuroda 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References , U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01J 31/12, 31/15 H01J 29/04

Claims (4)

(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 made of one or more conductive plates, a focusing electrode, a horizontal deflection electrode and a vertical deflection electrode, At every one end or both ends of the plurality of line cathodes, an insulating thin plate is attached in a ring shape so that insulation between adjacent line cathodes can be provided, and the insulating thin plate ring, An image display device, comprising: a plate-shaped or rod-shaped stopper arranged on the back electrode so as to restrict the movement of the linear cathode in the stretching direction. 2. The image display device according to claim 1, wherein insulating thin plates are alternately attached to one end or both ends of each of the plurality of line cathodes in a ring shape. 3. The image according to claim 1, wherein a hole is provided near the center of the insulating thin plate, and a plate-like or rod-like stopper is provided on the back electrode so as to pass through the hole. Display device. 4. The image display device according to claim 1, wherein the insulating thin plate is constituted by a metal-ceramic-metal connecting plate.