JPH04233140A - Image display device - Google Patents

Abstract

PURPOSE:To curtail the number of faces of a metal mold for each of metal bases and also to decrease the number of welding processes in an image display device using a plurality of linear cathodes so as to display an image. CONSTITUTION:A plurality of linear cathode terminals 30 are fixed respectively to metallic bases 32 via glass. Also a plurality of signal electrode terminals 50 are fixed respectively to metallic bases 51 via glass. Each of these metallic bases 32, 51 is fixed to a rear-face metallic vessel 31 through a welding process. Hereupon, the plural metallic bases 32 and the plural metallic bases 51 are formed respectively in the same shapes. Whereby the number of faces of a press metal-mold for each of the metallic bases 32, 51 can be minimized while also the number of processes for the automatic program of a robot employed at the time of laser welding can be curtailed.

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 for video equipment and a terminal device thereof.

0002

2. Description of the Related Art A conventional image display device will be explained with reference to FIG. In FIG. 5, 6 is a back electrode, 7i to 7
d 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, 12a, 12b are horizontal deflection electrodes, 13i, 13 B is a vertical deflection electrode, and these components are housed in a front glass container 14 and a rear metal container 1, and the insides of the containers 1 and 14 are kept in a vacuum. The line cathodes 7A to 7D are stretched in the horizontal direction so as to generate an electron flow with a substantially uniform current density distribution in the horizontal direction, and a plurality of line cathodes (in this example, a plurality of line cathodes are arranged vertically at appropriate intervals). , 7 A, 7 B, 7 C, and 7 D are shown). These wire cathodes 7a to 7d are constructed by, for example, coating a tungsten wire with an oxide cathode material on its surface.

[0003] The back electrode 6 is made of a flat conductive material and is provided parallel to the line cathodes 7a-7d. The extraction electrode 8 faces 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.
It consists of a conductive plate 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.

The signal electrodes 9 include a plurality of vertically elongated conductive plates 17 arranged at predetermined intervals at positions facing each of the through holes 15 in the extraction electrode 8 in the horizontal direction.
In each conductive plate 17, a similar through hole 16 is provided at a position opposite to the through hole 15 of the extraction electrode 8.
have. The shape of the through hole 16 may be an ellipse or a rectangle, or it may be like a vertically elongated slit like the signal electrode in the conventional embodiment described above. The first focusing electrode 10 is made of a conductive plate having through holes 18 at positions facing each through hole 16 of the signal electrode 9 . Through hole 1
The shape of 8 may be circular, oval, or slit-like. The second focusing electrode 11 has a vertically connected slit hole 19 located opposite to the through hole 18 of the first focusing electrode 10 . 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.

[0005] The horizontal deflection electrodes 12a and 12b are composed of two conductive plates 21 and 22 connected by comb-like end portions that are interlocked with each other with an appropriate space between them on the same plane. Space 20 created between electrodes 12a and 12b
is opposite to the through slit hole 19 of the second focusing electrode 11 . The vertical deflection electrodes 13a and 13b are made of conductive plates connected at their ends as shown in 23 and 24, that is, two comb-shaped conductive plates that are interlocked with each other on the same plane with an appropriate interval between them. For example, for an electron beam 25, a lower conductive plate 23 and an upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 is constructed by coating the inner surface of the glass container 14 with a phosphor 27 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown) thereon.

The operation of the image display device configured as described above will be explained. First, a voltage V is applied to the back electrode 6.
1. Apply a voltage V2 higher than V1 to each extraction electrode 8. Furthermore, if an appropriate voltage V0 such as V1<V0<V2 is applied to the line cathode 7a with a heater current flowing to facilitate electron emission by heating the line cathode, the electric field on the line cathode surface becomes positive. As a result, an electron current is emitted and accelerated toward the extraction electrode 8. Further, for example, if a voltage V0 such that V0>V2 is applied to the linear cathode 7a, the electric field on the surface of the linear cathode becomes negative, thereby suppressing the emission of electrons. Therefore,
By individually controlling the voltage of the line cathodes, electron beams are emitted from the upper line cathode 7A, 7B, 7C, etc. repeatedly for a fixed period of time, and each line cathode is moved in the horizontal direction. It is possible to generate a sheet-shaped electron beam with a uniform current density distribution.

The above sheet-shaped electron beam is then horizontally divided into a plurality of parts by the through hole 15 of the extraction electrode 8, and further formed into a large number of electron beam rows, which are connected to the signal electrode 9.
At this time, if the voltage V3 of the signal electrode 9 is V3>V0, the electron beam passes through and V3
If <V0, 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 reaches the first focusing electrode 10 and the second focusing electrode 11, and then passes through the through hole 1.
8. After being focused and shaped by the electrostatic lens effect of the slit hole 19, the conductive plates 23 between adjacent conductive plates of the horizontal deflection electrodes 12a and 12ro and between the adjacent conductive plates of the vertical deflection electrodes 13a and 13ro , 24 (referred to as a deflection voltage), it is electrostatically deflected horizontally and vertically. Furthermore, a high voltage (for example, 10 KV) is applied to the metal pack layer of the screen 26, and the electron beam is accelerated to high energy and collides with the metal pack, causing the phosphor to emit light.

[0009] When a television screen is divided vertically and horizontally into a matrix to form a collection of small sections 28, each small section 28
The entire image can be displayed on the screen by associating the electron beams divided as described above one by one and deflecting and scanning the electron beams only within each subdivision. 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.

0010

In such an image display device, the line cathode terminal 36 is an airtight terminal formed on the rear metal container 35 with a glass interposed between the terminal 36 and the metal base 37, as shown in FIG. It is attached to the rear metal container 35 by welding from the inside of the space consisting of the front glass container 14 and the rear metal container 35, so that terminals can be brought out. The signal electrode terminals 42 are also fixed to metal bases 43, 45 with glass, and the metal bases 43, 45 are attached to the rear metal container 35 by welding, allowing the terminals to be brought out. However, in such a configuration, the signal electrode terminal 42
Since the metal bases 43 and 45 have different shapes, there was a problem in that the number of mold surfaces for manufacturing the shape had to be increased, and furthermore, the number of man-hours for welding was also increased. .

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides an inexpensive image display device in which the metal base shape is minimized to the same shape, and the number of mold surfaces and welding man-hours are reduced.

0012

[Means for Solving the Problems] In order to solve the above problems, the image display device of the present invention has an airtight terminal formed by interposing glass between a line cathode terminal and a signal electrode terminal and a metal base. The metal base has the same shape at least in the line cathode terminal or the signal electrode terminal, thereby making it possible to reduce costs.

[0013]

[Operation] According to the present invention, by minimizing the shape of the metal base of the airtight terminal made of a metal base, the number of molds for the metal base can be reduced, and by making the shapes the same, the present invention can minimize the shape of the metal base. , it is also possible to reduce the number of software steps required for robots, etc. during welding.

[0014]

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 is a plan view showing a state in which the metal base has the same shape at least at the line cathode terminal and the signal electrode terminal and is attached to the rear metal container, FIG. 2 is a cross-sectional view showing the state in which the line cathode terminal is attached, and FIG. Figure 4 is a cross-sectional view showing the installation state of the signal electrode terminal.
FIG. 2 is a cross-sectional view showing how a wire cathode terminal is laser welded.

In FIG. 1, 31 is a rear metal container, and 30 is a wire cathode terminal. As shown in an enlarged view in FIG. 2, the wire cathode terminals 30 are integrated with a metal base 32 having a stepped part and a flange through a glass 33, and all of the wire cathode terminals 30 are attached to the metal base 32. There is. This ensures mutual positional accuracy of the line cathode terminals 30. In addition, the line cathode terminal 30 and the rear metal container 31
Insulation from the glass 33 is maintained by the glass 33. This structure also maintains airtightness. The line cathode terminal 30 is positioned by making a hole 39 in the rear metal container 31 so as to pass through it from the inside to the outside.

As shown in FIG. 4, a laser 40 is attached to the flange portion of the metal base 32 with which the line cathode terminal 30 is integrated.
is irradiated to melt the metal base 32 and the rear metal container 31. By creating this melted part 38 around the entire periphery of the flange of the metal base 32, the wire cathodes 7A to 7D shown in FIG. Furthermore, one outer tip is connected to a drive circuit (not shown). The terminals are attached to the rear metal container 1 from inside the space formed by the front glass container 14 and the rear metal container 1. Here, all of the plurality of metal bases 32 have the same shape.

Also, the signal electrode terminal 50 is similar to the line cathode terminal 30, and is integrated with a metal base 51 having a stepped portion and a flange through a glass 52 as shown in FIGS. 1 and 3. , are all attached to a metal base 51. Similarly to the line cathode terminal 30, the signal electrode terminal 50 is positioned by making a hole 39 in the rear metal container 31 so as to pass through it from the inside to the outside. The metal base 51 and the rear metal container 31 are irradiated with a laser to melt them, and a melted part is created around the entire metal base 51, whereby the signal electrode terminal 50 is adhered to the rear metal container 31 and the sealing property is maintained. It turns out. Further, since the pitch between the signal electrode terminals 50 is as narrow as 2 mm, the signal electrode terminals 50 are not arranged in a single row parallel to the rear metal container 31, but are arranged in two rows in a zigzag shape. Here, all the metal bases 51 have the same shape. Furthermore, terminals of other electrodes can be integrated at the same time.

According to this configuration, as shown in FIG. 1, the metal bases 32 (four in this case) of the line cathode terminals 30 have the same shape, and furthermore, the metal bases 51 (in this case six) of the signal electrode terminals 50 also have the same shape. They have the same shape and can simplify parts.

[0019]

As described above, the present invention minimizes the number of surfaces of the metal base press die by making the shapes of at least the metal bases of the line cathode terminals or the signal electrode terminals the same, and the laser The number of man-hours required for automatic programming of the robot during welding can also be reduced, making it possible to provide an inexpensive image display device.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of an image display device according to an embodiment of the present invention.

[Figure 2] Cross-sectional view showing the installation state of the wire cathode terminal of the device

[
Figure 3: Cross-sectional view showing the installation state of the signal electrode terminal of the device

[
Figure 4: Cross-sectional view showing the procedure for welding the metal base of the wire cathode terminal and the rear metal container of the device

[Fig. 5] Exploded perspective view showing the basic configuration of the image display device

[Fig. 6] Cross-sectional view of main parts of a conventional image display device

[Explanation of symbols]

30 Line cathode terminal 31 Rear metal container 50 Signal electrode terminal 32, 51 Metal base

Claims (1)

[Claims] Claim 1: A flat screen coated with phosphor;
A back electrode made of a conductive plate facing the screen, and a line cathode, a beam extraction electrode, a signal electrode, a focusing electrode, and a deflection electrode are arranged in the space between the back electrode and the screen in order from the back electrode side. and 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 cathode terminal and the signal electrode terminal are respectively fixed to the metal base via glass. In the image display device, a metal base is welded to the rear metal container, and the line cathode terminal and the signal electrode terminal are respectively taken out from the inner surface of the rear metal container by penetrating the rear metal container. An image display device characterized in that at least a line cathode terminal or a signal electrode terminal has the same shape.