JPH03141542A - Image display device - Google Patents

Abstract

PURPOSE:To increase the thickness of plate so as to prevent deformation of a rear metal vessel upon vacuum operation by installing linear cathode terminals and signal electrode terminals in the vessel, and fixedly attaching a metal base being integral with those terminals to the vessel by welding. CONSTITUTION:Linear cathode electrodes 36 are all integrated with, through a glass member 38, and installed in a metal base 37 having a stepped flange. The flange of the base 37 is irradiated with a razor beam 40 to fuse both of the base 37 and a rear metal vessel 35. Further signal electrode terminals 42 are integrated with a metal base 43 having a stepped flange through a glass member 45 in the same way as the linear cathode terminals 36, wherein the terminals 42 are all installed in the base 43. Both the base 43 and the vessel 35 are irradiated with a razor beam and fused to produce a fused part around the whole circumference of the base 43. It is thus possible to maintain the sealing characteristics with the vessel 35 and the terminals 42 fixedly attached.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device in video equipment and a terminal device thereof.

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, 72 is a line cathode 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, 12i, 120 is a horizontal deflection electrode, 13i, 130
is a vertical deflection electrode, and these components are housed in a front glass container 14 and a rear metal container 1.
There is a vacuum inside.

The wire shaft 72 is stretched in the horizontal direction so as to generate an electron flow with an approximately -like current density distribution in the horizontal direction.
A plurality of them are provided in the vertical direction at appropriate intervals (in this embodiment, only four, ie, 70.7 and 72, are shown). These wire cathode fins 72 are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material. The back electrode 6 is made of a flat conductive material and is provided parallel to the line cathode fins 72. The extraction electrode 8 is made of a conductive plate that faces the back electrode 6 via the line cathode and fin 72, and has a row of through holes 15 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Although the through hole 15 is circular in this embodiment, it may be elliptical or rectangular, or it may be slit-like like the extraction electrode in the conventional embodiment described above. Consisting of a row of vertically elongated conductive plates 17 arranged at predetermined intervals at positions 1 opposite to each other in the horizontal direction, each conductive plate 17 has a through-hole 15 for an extraction electrode 8. The shape of the through hole 16, which has a similar through hole I6 at a position opposite to the 16, may be an ellipse or a rectangle, or it may have an elongated slit-like shape in the vertical direction, as in the signal electrode of the conventional embodiment described above. The first focusing current winding 1O is made of a conductive plate having through holes 18 at positions facing each through hole 16 of the signal electrode 9. The shape of the through hole 1B is circular, elliptical, or slit-like. The second focusing electrode 11 may have a vertically connected slit hole 19 at a position opposite to the through hole 18 of the first focusing electrode 100. The shape of the slit hole 19 may be round, oval, or similar to the through hole 18 of the first focusing electrode 10.
Horizontal deflection electrodes 12 and 120 may be rectangular.
are 2 meshed with each other on the same plane with an appropriate space between them.
Conductor 11 Fi21 connected by two comb-like ends.

22, horizontal deflection electrode I2, 120
The space 20 created therein faces the through slit hole 19 of the second focusing electrode 11 . Vertical deflection electrode 13a,
130, as shown in 23.24 (consisting of conductive plates connected at their ends, that is, two comb-shaped conductive plates interlocked with each other on the same plane with an appropriate interval between them, for example, For the beam 25, a lower conductive plate 23 and an upper conductive plate 24 form a pair of vertical deflection electrodes.The screen 26 has a phosphor 27 coated on the inner surface of the glass container 14, which emits light when irradiated with the electron beam. A metal back layer (not shown) is added thereon.

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

First, voltage ■1 is applied to the back electrode 6, and vl is applied to the extraction electrode 8.
Apply higher voltage ■2. Furthermore, the wire cathode is heated,
■Well■ with heater current flowing to facilitate electron emission. When an appropriate voltage v0, such as V, is applied to the line cathode 5, the electric field on the line cathode surface becomes positive, and a current of electrons is emitted and accelerated toward the extraction electrode 8. Also, for example, a voltage ■ such that Vo>v=. When applied to the line cathode, the electric field on the line cathode surface becomes negative and electron emission can be suppressed. Therefore, by individually controlling the voltage of the line cathodes, 70.7 h...
. . . is repeated in order to emit an electron beam for a certain period of time, and a sheet-shaped electron beam having a uniform current density distribution in the horizontal direction can be generated for each line cathode. The above-mentioned sheet-like electron beam is then horizontally divided into a plurality of parts by the through-hole 15 of the extraction electrode 8, and reaches the through-hole 16 of the signal electrode 9 as a further large number of electron beam rows. , the voltage V of the signal electrode 9
, if V s > V *, the electron beam passes,
If V, <V, the electron beam loses kinetic energy and cannot pass through. Therefore, by controlling v3 over time, the amount of electron beam passing is adjusted individually for each electron beam according to the video signal for displaying the picture element.

The electron beam that has passed through the signal electrode 9 then passes through the first focusing electrode 1
0. After reaching the second focusing electrode 11 and being focused and shaped by the electrostatic lens effect of the through hole 18° slit hole I9, , 130 adjacent conductive plates 23.
It is electrostatically deflected horizontally and vertically by a potential difference (called a deflection voltage) applied between 24. 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 high energy and collides with the metal back, causing the phosphor to emit light.

When a television screen is divided vertically and horizontally into a matrix of subsections 28, one electron beam separated as described above is associated with each subsection, and the electron beam is connected to each subsection. By deflecting and scanning only within minutes, the entire image can be displayed on the screen. Further, by controlling the RGB video signals corresponding to each picture element over time using the signal electrode voltages as described above, a television moving image can be reproduced.

yAH to be Solved by the Invention In such an image display device, the line cathode terminal 30 is connected to the sixth
As shown in the figure, the terminals are integrated with a wire cathode terminal pedestal 32 made of glass and a hermetic seal 33 in order to ensure individual positional accuracy of the terminals and maintain insulation with the rear metal container 31. Since this fixed part is attached from the outside of the rear metal container 31, when the inside of the container 31 is brought into a vacuum state, the wire cathode terminal pedestal 32 is fixed to the rear metal container 31 by deformation due to the stress. The problem is that the micro-crank is inserted into the glass frit 34, which tends to cause vacuum leaks, and furthermore, because the signal electrode terminals (not shown) have a narrow terminal pitch, it is difficult to arrange a large number of individual signal electrode terminals on the rear surface. Another problem was that the metal container 31 had to be made large.

In view of the above problems, the present invention provides an image display device that prevents the occurrence of micro-cranks in the glass frit, maintains a good degree of vacuum, provides stable image quality, and allows signal electrode terminals to be installed compactly. It is something to do.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
A confidential terminal formed by interposing glass between the terminal and the metal base is attached by welding to the rear metal container from the inside of the space consisting of the front glass container and the rear metal container, making it possible to take out the terminal.

Effects of the present invention With the above-described configuration, by attaching a confidential 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, increasing rigidity. The deformation stress of the rear metal container when creating a vacuum inside the container is reduced, preventing the occurrence of micro-cranks on the glass between the metal base and the terminal, and making it possible to maintain a good degree of vacuum. Furthermore, since multiple terminals are attached to the metal base and the terminals are not individual, it is easy to ensure 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. Figure 1 is a plan view showing how the line cathode terminal, signal electrode terminal, and other terminals are attached to the rear metal container, and Figure 2 is a cross-sectional view showing how the line cathode terminal is attached. FIG. 3 is a sectional view showing how the signal electrode terminal is attached, and FIG. 4 is a sectional view showing how the wire cathode terminal is laser welded. In FIG. 1, 35 is a rear metal container, and 36 is a wire cathode terminal. As shown in an enlarged view in FIG. 2, the wire cathode terminal 36 is integrated with a metal base 37 having a stepped portion and a flange through a glass 38, and is attached to the metal base 37 by multiple terminals. It is being This ensures mutual positional accuracy of the line cathode terminals 36. Further, insulation between the line cathode terminal 36 and the rear metal container 35 is maintained by the glass 38. This structure also maintains confidentiality. The line cathode terminal 36 is positioned so as to pass through the rear metal container 35 from the inside to the outside by making a hole 39 therein.

As shown in FIG. 4, this integrated metal base 37
The metal base 37 is irradiated with a laser 40 on the flange portion of the metal base 37.
and the rear metal container 35 are melted. By creating this fused portion 41 around the entire periphery of the flange of the metal base 37, the wire cathode terminal 36 is adhered to the rear metal container 35, and sealing performance is maintained. A wire cathode phi-72 shown in FIG. 5 is connected to the inner tip of the green cathode terminal 36 directly or by a lead wire, and one outer tip is connected to a drive circuit (not shown). The terminals are attached to the rear metal container l from inside the space formed by the front glass container 14 and the rear metal container l.

Also, the signal electrode terminal 42 is similar to the line cathode terminal 36, and as shown in FIGS. 1 and 3, it is integrated with a metal base 43 having a stepped portion and a flange via a glass 45. A plurality of favorites are attached to a metal base 43.

Similarly to the line cathode terminal 36, the signal electrode terminal 42 is positioned by making a hole 39 in the rear metal container 35 so as to pass through it from the inside to the outside. The metal base 43 and the rear metal container 35 are irradiated with a laser to melt and create a melted part around the entire metal base 43, whereby the signal electrode terminal 42 is adhered to the rear metal container 35 and sealing properties are maintained. It turns out. Further, since the pitch between the signal electrode terminals 42 is as narrow as 2111111, the signal electrode terminals 42 are not arranged in one row parallel to the rear metal container 35, but are arranged in two rows in a zigzag shape. Furthermore, terminal 4 of other electrodes
4 can be integrated at the same time.

According to this configuration, the terminals are not attached as single items as shown in FIG. 6, but the terminals are taken out as a package, and
Furthermore, by welding the metal base 37, the plate thickness is increased, which alleviates the deformation of the rear metal container 35 during vacuum, and since no frit is used, there is no cranking, which improves the overall condition of the container. It becomes possible to maintain the degree of vacuum.

Effects of the Invention As described above, in the present invention, at least the line cathode terminal and the signal electrode terminal are attached from the inside of the rear metal container, and the metal base integral with the terminal is adhered to the rear metal container by welding. This increases the deformation of the rear metal container during vacuum, and since no frit is used, there is no cracking, ensuring the maintenance of the vacuum level and improving reliability regarding vacuum leaks. It is something.

Furthermore, it is no longer necessary to attach individual terminals one by one to the rear metal container, making it possible to provide an image display device with a significant cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing how the line cathode terminal, signal electrode terminal, and other terminals are attached to the rear metal container of the image display device in one embodiment of the present invention, and Fig. 2 is the line cathode attachment of the same device. Figure 3 is a cross-sectional view showing how the signal electrode terminal is installed in the same device, and Figure 4 is a cross-sectional view showing how to weld the metal base of the line cathode terminal and the rear metal container of the same device. 5 is an exploded perspective view showing the basic structure of the image display device, and FIG. 6 is a sectional view showing the attachment state of the rear container and the wire cathode terminal of the conventional image display device. 35... Rear metal container, 36... Line cathode terminal, 37° 43... Metal base, 38.4
5... Glass, 39... Hole, 40...
... Laser, 41 ... Melting part, 42 ...
...Signal electrode terminal, 44...Other terminals.

Claims (3)

[Claims] (1) A flat screen coated with phosphor and a back electrode made of a conductive plate facing the screen are provided, and a line is placed in the space between the back electrode and the screen in order from the back electrode side. It is equipped with a cathode, a beam extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, and also includes a front glass container and a rear metal container for storing the screen, the wire cathode, and the various electrodes in a vacuum state, and at least the wire A cathode terminal and a signal electrode terminal are each fixed to a metal base via glass, this metal base is welded to the rear metal container, and the wire cathode and An image display device characterized in that signal electrode terminals are respectively taken out. (2) The image display device according to claim 1, characterized in that a plurality of airtight terminals are successively provided with glass interposed between the terminals and the metal base. (3) The image display device according to claim 1 or 2, wherein the metal base is a flange with a stepped portion, and the flange portion and the rear metal container are sealed by welding. .