JP2929620B2 - 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 A conventional image display device will be described with reference to FIG. In FIG. 5, 6 is a back electrode, 7a to 7d are linear cathodes as electron beam sources, 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, and 13a and 13b are vertical deflection electrodes. These components are housed in the front glass container 14 and the rear metal container 1, and the inside of the containers 1 and 14 is evacuated. . The linear cathodes 7a to 7d are stretched in the horizontal direction so as to generate an electron current having a substantially uniform current density distribution in the horizontal direction. In the figure, only four of 7a, 7b, 7c, and 7d are shown). These linear cathodes 7a to 7d are formed by coating a surface of a tungsten wire with an oxide cathode material, for example. The back electrode 6 is made of a flat conductive material, and is provided in parallel to the linear cathodes 7a to 7d. The extraction electrode 8 is opposed to the back electrode 6 via the line cathodes 7a to 7d, and is formed from a conductive plate having rows of through holes 15 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Become. Through hole 15
Is circular in this embodiment, but may be elliptical or rectangular, or may be a slit-like electrode like the lead electrode of the above-described conventional embodiment. The signal electrode 9 includes a row of a plurality of vertically elongated conductive plates 17 arranged at predetermined positions at positions opposed to each of the through holes 15 in the extraction electrode 8 in the horizontal direction at predetermined intervals. Is
A similar through-hole 16 is provided at a position facing the through-hole 15 of the extraction electrode 8. The shape of the through hole 16 may be elliptical or rectangular, or may be a vertically elongated slit like the signal electrode of the above-described conventional embodiment.
The first focusing electrode 10 is formed of a conductive plate having a through hole 18 at a position facing the through hole 16 of the signal electrode 9. Through hole 18
May be a circle, an ellipse, or a slit. Second
The focusing electrode 11 has a slit hole 19 vertically connected to a position facing the through hole 18 of the first focusing electrode 10. The shape of the slit hole 19 is the same as that of the through hole 18 of the first focusing electrode 10.
Round holes, ellipses, and rectangles may be used. Horizontal deflection electrode 12
A and B are composed of two conductive plates 21 and 22 which are connected to each other at the end of a comb-like shape and mesh with each other via a space as appropriate. The space 20 formed therebetween faces the through slit hole 19 of the second focusing electrode 11. The vertical deflection electrodes 13a and 13b, as shown at 23 and 24, engage the conductive plates connected at the ends, i.e., two comb-like conductive plates on the same plane at appropriate intervals. For example, for the electron beam 25, the lower conductive plate 23 and the upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 is configured by applying a phosphor 27 that emits light by 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, a voltage V ₁ is applied to the back electrode 6 and a voltage V ₂ higher than V ₁ is applied to the extraction electrode 8. Further, the line cathode is heated, and V ₁ <
When an appropriate voltage V ₀ that satisfies V ₀ <V ₂ is applied to the line cathode 7a, the electric field on the surface of the line cathode becomes positive, an electron flow is emitted, and the electron flow is accelerated toward the extraction electrode 8. Further, for example, when a voltage V ₀ satisfying V ₀ > V ₂ 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 voltage of the line cathode, the electron beam is repeatedly emitted from the upper line cathode 7a in the order of 7 b, 7 c,. A sheet-like electron beam having a uniform current density distribution in the horizontal direction can be generated. Next, the above-mentioned sheet-like electron beam is divided into a plurality of pieces in the horizontal direction by the through-holes 15 of the extraction electrode 8, and further reaches a through-hole 16 of the signal electrode 9 as a large number of electron beam rows. to the voltage V ₃ of the signal electrodes 9 V _3> V ₀ Tosureba electron beam passes through, V ₃ <V ₀ Tosureba electron beam can no longer pass loses kinetic energy. Therefore, by time control of the V _3, to adjust the electron beam passing amount each electron beam individually in accordance with a video signal for displaying picture elements.

The electron beam that has passed through the signal electrode 9 is then turned to a first focusing electrode.
10, after reaching the second focusing electrode 11, being focused and shaped by the electrostatic lens effect of the through hole 18 and the slit hole 19, between the adjacent conductive plates of the horizontal deflection electrodes 12a and 12b and vertical deflection. Electrostatic deflection is performed horizontally and vertically by a potential difference (referred to as a deflection voltage) provided between the adjacent conductive plates 23 and 24 of the electrodes 13a and 13b. 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 divided vertically and horizontally into a matrix to form an aggregate of subsections 28, the electron beams separated as described above correspond to each subsection, and the electron beam is divided into subsections. By deflecting and scanning only within the minute, the entire screen can be projected on the screen. In addition, by controlling the RGB video signal corresponding to each picture element with time using the signal electrode voltage as described above, a television moving image can be reproduced.

Problems to be Solved by the Invention In such an image display device, the linear cathode terminal 30
As shown in the figure, in order to secure the positional accuracy of each terminal and maintain insulation with the rear metal container 31, the terminal is integrated with a line cathode terminal base 32 made of glass and a hermetic seal 33. And this integrated part is the rear metal container 31
When the inside of the container 31 is evacuated, deformation due to the stress causes the line cathode terminal base
Micro-cracks enter the glass frit 34 that secures the rear surface 32 to the metal container 31, causing vacuum leaks to occur easily. Further, since the signal electrode terminals (not shown) have a narrow terminal pitch, individual signal electrodes are not provided. Arranging a large number of terminals also has a problem that the rear metal container 31 must be enlarged.

The present invention has been made in view of the above problems, and provides an image display device capable of preventing the occurrence of microcracks in glass frit, maintaining a good degree of vacuum, supplying stable image quality, and enabling signal electrode terminals to be mounted compactly. Is what you do.

Means for Solving the Problems In order to solve the above problems, an image display device of the present invention includes an airtight terminal having glass between a terminal and a metal base, and a space formed by a front glass container and a rear metal container. It is attached to the metal container on the rear side from the inside by welding to enable terminal output.

Action The present invention, by the above configuration, by attaching the hermetic terminal made of a metal base to the rear metal container from the inside of the container by welding, the thickness of the metal base is added to the thickness of the rear metal container, and the rigidity is increased. The deformation stress of the rear metal container when the inside of the container is evacuated is reduced, the occurrence of microcracks in the glass between the metal base and the terminal is prevented, and a good degree of vacuum can be maintained. Further, since a plurality of terminals are attached to the metal base and the terminals are not individual, it is easy to secure the positional accuracy of the terminals.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an attached state of a line cathode terminal, a signal electrode terminal and other terminals to a rear metal container, FIG. 2 is a sectional view showing an attached state of a line cathode terminal, and FIG. FIG. 4 is a cross-sectional view showing an attached state of the signal electrode terminal, and FIG. 4 is a cross-sectional view showing a state of laser welding of the linear cathode terminal. In FIG. 1, 35 is a rear metal container, and 36 is a linear cathode terminal. As shown in FIG. 2 in an enlarged manner, the line cathode terminal 36 is integrated with a metal base 37 having a stepped portion and a flange via a glass 38, and all of the plurality of wire cathode terminals 36 are attached to the metal base 37. Have been. This ensures the mutual positional accuracy of the linear cathode terminals 36. The insulation between the wire cathode terminal 36 and the rear metal container 35 is maintained by the glass 38. Moreover, the airtightness is maintained by this structure. The wire cathode terminal 36 is positioned so as to penetrate it from the inside to the outside by making a hole 39 in the rear metal container 35.

As shown in FIG. 4, the integrated metal base 37
The metal base 37 and the rear metal container 35 are melted by irradiating a laser 40 to the flange portion. By forming this fusion part 41 on the entire circumference of the flange of the metal base 37, the rear metal container
The line cathode terminal 36 is adhered to 35, and the sealing property is maintained. The line cathodes 7a to 7d shown in FIG. 5 are connected to the inner end of the line cathode terminal 36 directly or by a lead wire, and one outer end is connected to a drive circuit (not shown). The terminals are attached to the rear metal container 1 from the inside of the space formed by the front glass container 14 and the rear metal container 1.

The signal electrode terminal 42 is the same as the line cathode terminal 36, as shown in FIG.
As shown in FIG. 3, it is integrated with a metal base 43 having a flange with a stepped portion via a glass 45, and all of the plurality of pieces are attached to the metal base 43. Similarly to the line cathode terminal 36, the signal electrode terminal 42 is
By drilling a hole 39 in 35, it is positioned so as to penetrate it from inside to outside. The metal base 43 and the rear metal container 35 are melted by laser irradiation, and a molten portion is formed all around the metal base 43, whereby the signal electrode terminal 42 is adhered to the rear metal container 35 and the sealing property is maintained. Will be. Also, the signal electrode terminals 42 are not arranged in a line in parallel with the rear metal container 35 because the terminal pitch is as narrow as 2 mm,
This is a zigzag shape having two rows. Further, the terminals 44 of the other electrodes can be integrated simultaneously.

According to such a configuration, it is not necessary to attach a single-piece terminal as shown in FIG. 6, and it is easy to take out the terminal collectively, and further, the thickness of the plate is increased by welding the metal base 37, and the vacuum The deformation of the rear-side metal container 35 at the time is alleviated, and since no frit is used, no crack is generated, and a good vacuum degree of the entire container can be maintained.

Effect of the Invention As described above, the present invention has a structure in which at least the line cathode terminal and the signal electrode terminal are attached from the inside of the rear metal container, and a metal base integral with the terminal is bonded to the rear metal container by welding. In addition to the increased shape, the deformation of the rear metal container during vacuum is alleviated, and since no frit is used, there is no crack, the degree of vacuum is maintained, and the reliability of vacuum leak is improved. It is. Further, it is not necessary to attach one single product terminal to the rear metal container, so that it is possible to provide an image display device in which a large cost reduction is achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an attached state of a line cathode terminal, a signal electrode terminal and other terminals to a rear metal container of an image display device according to an embodiment of the present invention, and FIG. FIG. 3 is a cross-sectional view showing a signal electrode terminal mounting state of the apparatus, FIG. 4 is a cross-sectional view showing a procedure for welding a metal base and a rear metal container of a linear cathode terminal of the apparatus, and FIG. FIG. 5 is an exploded perspective view showing a basic configuration of the image display device, and FIG. 6 is a cross-sectional view showing a mounting state of a rear container and a line cathode terminal of the conventional image display device. 35 ... rear metal container, 36 ... wire cathode terminal, 37, 43 ... metal base, 38, 45 ... glass, 39 ... hole, 40 ... laser, 41 ... fused part, 42 ... signal electrode Terminal, 44 ... Other terminals.

Claims (4)

(57) [Claims] 1. An electron generated from a linear cathode during an internal vacuum created by a front glass container and a rear metal container.
In an image display device having an electrode structure for displaying an image by irradiating a phosphor-coated screen through a beam extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, a current is supplied to the line cathode. The wire cathode terminal is fixedly integrated with a hole provided in the metal base via glass, penetrates through the hole, and is exposed to the outside of the rear metal container through the hole of the rear metal container. Is an image display device which is welded. 2. Electrons generated from a linear cathode during an internal vacuum created by a front glass container and a rear metal container,
In an image display device having an electrode structure for displaying an image by irradiating a phosphor-coated screen through a beam extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, supplying a voltage to the signal electrode The signal electrode terminal to be fixedly integrated with a hole provided in the metal base via glass and penetrates, and then exposed to the outside of the rear metal container through the hole of the rear metal container. Is an image display device which is welded. 3. The image display device according to claim 1, wherein the metal base has a plurality of holes. 4. The image display device according to claim 1, wherein the metal base is a flange provided with a stepped portion, and the flange and the rear metal container are sealed by welding. .