JPH05334970A - Image display device - Google Patents

Abstract

PURPOSE:To reduce the rate of warping of a rear face metallic container, relating to an image display device which displays images using a plurality of cathode lines. CONSTITUTION:A laser beam is applied to the outer surface of a rear face metallic container 60 so as to warp the outer surface in advance and then a plurality of cathod line terminals 66 are fixed by glass to a metallic base 67. A plurality of signal electrode terminals 72 are also fixed by glass to a metallic base 73. The metallic bases 67, 73 are fixed to the inner surface of the rear face metallic container 60 by laser welding and thereby the rate of warping of the rear face metallic container is reduced and accuracy is increased, resulting in beautiful images.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device of the type which utilizes a high voltage and irradiates an electron beam.

[0002]

2. Description of the Related Art A conventional image display device will be described with reference to FIG. In FIG. 5, 1 is a rear metal container, 6
Is a back electrode, 7a to 7d are line cathodes as an electron beam source, 8 is an electron beam extraction electrode, 9 is a signal electrode, 10
Is a first focusing electrode, 11 is a second focusing electrode, 12a and 12b are horizontal deflection electrodes, 13a and 13b are vertical deflection electrodes, and these components are covered by the front glass container 14 and the rear metal container 1. The inside of the container is a vacuum inside the containers 1 and 14. The line cathodes 7a to 7d are horizontally stretched so as to generate an electron flow having a substantially uniform current density distribution in the horizontal direction, and a plurality of line cathodes (in the present embodiment, a plurality of them are vertically arranged at appropriate intervals). , 7a, 7b, 7c and 7d are only shown)
It is provided. These wire cathodes 7a to 7d are formed by coating an oxide cathode material on the surface of a tungsten wire, for example.

The back electrode 6 is made of a flat plate-shaped conductive material and is provided in parallel with the line cathodes 7a to 7d. The extraction electrode 8 is opposed to the back electrode 6 via the line cathodes 7a to 7d, and has a row of through holes 15 provided at appropriate intervals in the horizontal direction from a conductive plate having a horizontal linear shape facing each line cathode. Become. Although the through hole 15 is circular in this embodiment, it may be oval or rectangular, or may be slit-like like the extraction electrode of the conventional embodiment described above.

A plurality of signal electrodes 9 are provided in each of the through-holes 15 in the lead-out electrode 8 and are vertically long and slender conductive plates 1 arranged at predetermined positions in the horizontal direction so as to face each other.
It consists of 7 rows.

Each conductive plate 17 has a through hole 16 at a position facing the through hole 15 of the lead electrode 8. The shape of the through hole 16 may be an ellipse or a rectangle, or may be a vertical elongated slit-like shape like the signal electrode of the above-described conventional embodiment.

The first focusing electrode 10 is composed of a conductive plate having through holes 18 at positions facing the through holes 16 of the signal electrode 9, respectively. The shape of the through hole 18 may be circular, elliptical, or slit-like.

The second focusing electrode 11 is the first focusing electrode 1
It has slit holes 19 which are vertically connected at positions opposite to the through holes 18 of No. 0. The shape of the slit hole 19 may be a round hole, an ellipse, or a rectangle like the through hole 18 of the first focusing electrode 10.

The horizontal deflection electrodes 12a and 12b are composed of conductive plates 21 and 22 which are connected to each other by two comb-teeth-shaped end portions which are meshed with each other on the same plane with an appropriate space therebetween. Space 2 created between electrodes 12a and 12b
0 is opposed to the through slit hole 19 of the second focusing electrode 11.

The vertical deflection electrodes 13 a and 13 b are 23 and 2, respectively.
As shown in FIG. 4, a conductive plate connected at its ends, that is, two comb-shaped conductive plates are meshed with each other on the same plane with an appropriate gap therebetween, for example, an electronic beam 2
5, the lower conductive plate 23 and the upper conductive plate 24
Form a pair of vertical deflection electrodes. Screen 26
Is formed by applying a phosphor 27, which emits light upon irradiation with an electron beam, to the inner surface of the glass container 14 and adding a metal back layer (not shown) thereon.

The operation of the image display device configured as described above will be described. First, the voltage V is applied to the back electrode 6.
1. A voltage V2 higher than V1 is applied to the extraction electrode 8. Further, by heating the line cathode and applying a suitable voltage V0 satisfying V1 <V0 <V2 to the line cathode 7a in the state of flowing a heater current to facilitate electron emission, the electric field on the surface of the line cathode is increased. The flow of electrons becomes positive and is emitted, and accelerated toward the extraction electrode 8. Further, for example, if a voltage V0 such that V0> V2 is applied to the line cathode 7a, the electric field on the surface of the line cathode becomes negative and the emission of electrons can be suppressed. Therefore, by individually controlling the voltages of the line cathodes, the line cathodes 7a, 7b, 7c, ... It is possible to generate a sheet-shaped electron beam having a uniform current density distribution in each horizontal direction.

The sheet-like electron beam described above is then horizontally divided into a plurality of holes by the through-holes 15 of the lead electrode 8 to form a larger number of electron beam rows.
When the voltage V3 of the signal electrode 9 is set to V3> V0 at this time, the electron beam passes and V3
If <V0, the electron beam loses kinetic energy and cannot pass through. Therefore, by controlling V3 with time, the electronic beam passing amount is adjusted individually for each electronic beam in accordance with the video signal for displaying the picture element.

The electron beam having passed through the signal electrode 9 next reaches the first focusing electrode 10 and the second focusing electrode 11, and the through hole 1
8. After being converged and shaped by the electrostatic lens effect of the slit hole 19, between the adjacent conductive plates of the horizontal deflection electrodes 12a and 12b and between the adjacent conductive plates 23 of the vertical deflection electrodes 13a and 13b. , 24 is electrostatically deflected horizontally and vertically by a potential difference (hereinafter, referred to as a deflection voltage) applied.

Further, a high voltage (for example, 10 KV) is applied to the metal back layer of the screen 26, and the electron beam is accelerated to a high energy and collides with the metal back, causing the phosphor to emit light.

When the television screen is vertically and horizontally divided into a matrix to form a group of subsections 28, each subsection 28
On the other hand, the electronic beams divided as described above are made to correspond to each one, and the entire screen can be displayed on the screen by deflecting and scanning the electronic beam only within each small section. .. Also, by controlling the RGB video signal corresponding to each picture element with the signal electrode voltage over time as described above, a television moving image can be reproduced.

[0015]

In such an image display device, as shown in FIG. 6, the wire cathode terminal 30 has a rear surface metal container 31 and a glass 33 between the terminal 30 and the metal base 32.
The airtight terminal formed through the above is attached to the rear metal container 31 from the inside of the space formed by the front glass container 14 and the rear metal container 31 by laser welding so that the terminals can be exposed. The signal electrode terminal 50 is also fixed by a glass 52 between it and a metal base 51 as shown in FIG. 7, and this metal base 51 is attached to the rear metal container 31 by laser welding so that the terminal can be exposed. I am trying.

However, in such a structure, the metal base 32 of the wire cathode terminal 30 and the metal base 51 of the signal electrode terminal 50 are heat-shrinked when laser-welded to the metal container 31 on the rear surface, so that the rear metal is formed. A problem occurs that the container 31 warps in a concave shape when the inner surface side is turned up, and each electrode assembled on the rear metal container 31 also warps, that is, the phosphor and the electrode are relatively opposed to each other. This causes a problem that the image is not displayed well because the distance becomes incorrect.

In view of the above problems, the present invention provides a beautiful image display device in which warpage of the rear metal container is reduced.

[0018]

In order to solve the above-mentioned problems, the image display device of the present invention comprises glass between the terminals of the line cathode terminal and the signal electrode terminal and the metal base. Before welding the metal base of the airtight terminal to the inner surface (front side) of the rear metal container, the outer surface (back side) of the rear metal container.
A double line is formed by laser irradiation at a position corresponding to the metal base welding position on the inner surface of the inner surface of the rear surface metal container, and the rear surface metal container is previously warped in a reverse direction. -The warpage is canceled when the soot is welded, and the warpage of the rear metal container is reduced.

[0019]

According to the present invention, the warp of the rear metal container is reduced by the above-mentioned structure, so that the warp of various electrodes assembled on the rear metal container is reduced, and the relative positions of the phosphor and the electrode are evenly arranged. The beam will reach the correct position. This allows a beautiful image display.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows that the outer surface (back side) of the rear metal container is laid.
FIG. 3 is a plan view showing a state in which the beam is irradiated, FIG. 2 is a plan view showing a mounting state of the wire cathode terminal and the signal electrode terminal inside the rear metal container (back side), and FIG. 3 is an inner surface of the rear metal container (front side). FIG. 4 is a cross-sectional view showing a mounting state of the wire cathode terminal by laser welding, and FIG. 4 is a cross-sectional view showing a state of laser welding of the signal electrode terminal.

In FIG. 1, reference numeral 60 denotes a rear metal container, which is provided on the outer surface (back side) of the rear metal container 60 (shown on the front surface in this figure).

First, the laser is applied to the inside of the metal base outline of the wire cathode terminal and the position inside the signal electrode terminal metal base outline, and then to the outside of the metal base outline. The laser is irradiated 63 at the position. As a result, the rear metal container 60 shown in this figure will warp in a concave shape when the outer surface (back side) is the front surface. With the inner surface (back side) as the surface, as shown in FIG. 2, the airtight terminal 64 of the wire cathode integrated with the metal base and the airtight terminal 65 of the signal electrode integrated with the metal base 65. Is the rear metal container 60
Be positioned at.

As shown in FIG. 3, the airtight terminal of the wire cathode is formed by integrating the wire cathode terminal 66 with a metal base 67 having a stepped portion and a flange through a glass 68. All of the plurality are attached to the metal base 67. This ensures the mutual positional accuracy of the wire cathode terminals 66. The insulation between the wire cathode terminal 66 and the rear metal container 60 is maintained by the glass 68.
In addition, the airtightness is maintained by this structure. And
The wire cathode terminal 66 is positioned by penetrating it from the inside to the outside by forming a hole 69 in the rear metal container 60.

The laser 70 is irradiated onto the flange portion of the metal base 67 in which the wire cathode terminal 66 is integrated to melt the metal base 67 and the rear metal container 60. By forming the melting portion 71 on the entire circumference of the flange of the metal base 67, the metal base 67 of the wire cathode terminal 66 and the rear metal container 60 are welded. Similarly to the wire cathode terminal 66, the signal electrode terminal 72 is also integrated through a glass 74 with a metal base 73 having a stepped portion and a flange, as shown in FIG. It is attached to the metal base 73. Further, like the wire cathode terminal 66, the signal electrode terminal 72 is positioned by penetrating it from the inside to the outside by forming a hole 75 in the rear metal container 60.

The metal base 73 and the rear metal container 60 are irradiated with a laser to melt the metal base 73, and a melting portion is formed on the entire circumference of the metal base 73. Will be adhered and the sealing property will be maintained. In such a structure, the wire cathode terminal 6 is previously provided in the rear metal container 60.
Laser irradiation is performed on the outer surface (back side) of the rear metal container 60 corresponding to the laser bonding position of the metal base 67 of 6 and the laser bonding position of the metal base 73 of the signal electrode terminal 72. First, the outer surface (back side) is curved in a concave shape in the form of shooting, and then the metal base 67 of the wire cathode terminal 66 is laser-bonded and the metal base 73 of the signal electrode terminal 72 is laser-bonded. The warp of the rear metal container 60 is canceled to reduce the warp.

[0027]

As described above, according to the present invention, before the metal bases of the wire cathode terminal and the signal electrode terminal are welded to the rear metal container, the outer surface of the rear metal container corresponding to the welding position is laid.
The irradiation is performed to cause a reverse warp, and by utilizing the warp when the wire cathode terminal and the signal electrode terminal are laser-joined,
By reducing the amount of warpage of the rear metal container, the contents such as the back electrode and electrode will not warp, and the relative position of the electrode and the phosphor will not be misaligned, so the beam will be in the correct position. Therefore, a beautiful image display device can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing a state where laser irradiation is performed on an outer surface (back side) of a rear metal container of an image display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the attachment of the wire cathode terminal and the signal electrode terminal of the same device.

FIG. 3 is a cross-sectional view showing a state in which a wire cathode terminal is laser-welded to an inner surface (front side) of a rear metal container of the same apparatus.

FIG. 4 is a cross-sectional view showing a state in which signal electrode terminals are laser-welded to the inner surface (front side) of the rear metal container of the same device.

FIG. 5 is an exploded perspective view showing a basic configuration of a conventional image display device.

[Explanation of symbols]

 60 Rear metal container 62 Laser irradiation 63 Laser irradiation

Claims (1)

[Claims] 1. A flat screen screen coated with a phosphor and a back electrode composed of a conductive plate facing the screen, and a space sandwiched between the back electrode and the screen. A front glass container and a rear surface which are provided with a line cathode, a beam extraction electrode, a signal electrode, a focusing electrode, and a deflection electrode in this order from the back electrode side, and which house the screen, the line cathode, and the various electrodes in a vacuum state. A metal container is provided, and at least the wire cathode terminal and the signal electrode terminal are fixed to a metal base via glass, respectively.
In the image display device, wherein the wire cathode terminal and the signal electrode terminal are respectively taken out in a form of penetrating the rear metal container from the inner surface of the rear metal container by welding the inner surface of the rear metal container to the rear metal. On the outside of the container,
An image display device, wherein a laser is irradiated before the metal base is welded to the inner surface of the rear metal container.