JPS62296324A - Manufacture of image display device - Google Patents

Abstract

PURPOSE:To obtain an image display device for providing clear images with no vertical lines by arranging, ahead of laser junction, apertures smaller than the diameter of a laser beam on the welding part of an electron beam acceleration auxiliary electrode. CONSTITUTION:Apertures 35 smaller than the diameter of a laser beam are provided on the bar 33 of an electron beam acceleration auxiliary electrode 32 which is to be welded to an electron beam acceleration electrode 30. Then, positioning of either laser or work is made in the apertures 35 to be irradiated 34 by laser to weld electron beam acceleration electrode 30 to electron beam acceleration auxiliary electrode 32. This allows beams to pass through the electron beam acceleration auxiliary electrode 32 without causing distortion in its passage, thus causing no beam deflection, and enabling to obtain an image display device providing clear images with no vertical lines.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a method of manufacturing an image display device in video equipment.

Conventional technology Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a much longer depth than the screen, making it difficult to manufacture thin television receivers. It was impossible to do so.

Recently, EL display elements and plasma display devices have been used as flat display elements.

Although liquid crystal display elements and the like have been developed, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display, and have not been put into practical use. Therefore, as a device that can display color television images on a flat display device using electron beams, the screen on the screen is vertically divided into multiple sections, and the electron beam is vertically applied to each section. It is deflected in the direction to display a plurality of lines, and further divided into a plurality of sections in the horizontal direction, and phosphors such as R, G, and B are sequentially emitted in each section, and the R, G, Some devices display a television image as a whole by controlling the amount of electron beam irradiation onto a phosphor such as B using a color video signal. FIG. 3 shows its basic configuration. In FIG. 3, from the back to the front, in order: back electrode 1, line cathode 2 as an electron beam source, vertical focusing electrodes 3a, 3b, vertical deflection electrode 4, electron beam flow control electrode 5, horizontal focusing electrodes 6a and 6b. , a horizontal deflection electrode 7, an electron beam accelerating electrode 8, and a glass container 9.22 are arranged, and the components are housed in the glass container and evacuated. Next, a method for manufacturing the above device will be explained with reference to FIG. After the back electrode 1 to the horizontal deflection electrode 7 are mutually fixed at a predetermined distance and positioned in the in-plane direction of the electrodes by the coupling spacer 23, they are housed in a glass container to complete the image display device. be done. Here, the positions of the electrodes in the in-plane direction are 1.2, 3a, 3b, 4°, 5.6.7, and the electron beam source holding means.

This is carried out using a positioning hole 24 accurately drilled in an accelerating electrode holding means (both not shown) and a positioning pin 26 that commonly passes through the positioning hole 24.

When fixing each electrode, due to the manufacturing process, a method is adopted in which the area from the electron beam flow control electrode to the horizontal deflection electrode is divided into several units, and after the units are fixed, the units are fixed together. . This is because the electron beam flow control electrode unit and the horizontal deflection electrode unit constitute electrical electrodes and must be divided into a part to which a 10 charge is applied and a part to which a negative charge is applied. However, since these patterns have extremely small slit widths and extremely thin plate thicknesses, it is difficult to bake and fix them in a divided state. Therefore, the electron beam flow control electrode and the horizontal deflection electrode are usually baked and fixed to form a unit, and then the stain pole pattern is divided by a method such as a laser. As shown in Fig. 6, a conventional electron beam accelerating electrode is a unit in which a back electrode 1, a cathode 2, a vertical deflection electrode 4, and an electron beam flow control electrode 6 to a horizontal deflection electrode 7 are combined by firing. This is accomplished by positioning holes that are accurately drilled in the fixing frame 26 and positioning pins that commonly pass through the positioning holes (not shown) while being positioned at intervals and in the in-plane direction of the electrodes. Further, the electron beam accelerating electrode 8 is fixed to the adult beam accelerating electrode frame 27, and is fixed and assembled via the support pin 28 by the positioning pin of the electrode frame 27 described above. Here, the electron beam accelerating electrode 8.
Each book is stretched with a tension of 400 to 600 knots and fixed to a fixed frame. That is, the electron beam accelerating electrode 8 is 1
Since there are six, a total tension amount of 6.4 to 9.6 and a load of 9 are applied to the fixed frame 27.

Problems to be Solved by the Invention However, in the above configuration, since tension is applied to the 16 electron beam accelerating electrodes, the fixed frame is stretched to the center and flexes, causing the electron beam accelerating electrodes to flex. As a result, horizontal lines or color unevenness appear in the image, resulting in image defects, as well as the disadvantage that the fixed frame is distorted, making it impossible to maintain the linearity of the 16 electron beams, and the height direction of the 16 electron beam accelerating electrodes. The problem was that it was difficult to position the bridge, and that it took a lot of man-hours to install it.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
The electron beam accelerating electrode is a thick plate-like rigid body, and the electron beam accelerating auxiliary electrode is a thin plate material. After joining the electron beam accelerating electrode and the electron beam accelerating auxiliary electrode, the frame for the electron beam accelerating electrode is further welded and joined. When configuring it as a unit, a hole smaller than the laser beam diameter is formed in the laser welded part of the electron beam acceleration auxiliary electrode before laser bonding.

Function The present invention allows the electron beam accelerating electrode to be assembled by welding and fixing it without applying tension due to the above-described configuration, and furthermore, a hole smaller than the laser beam diameter is formed in the laser welding part of the electron beam accelerating auxiliary electrode. By welding and fixing the electron beam acceleration electrode and the electron beam acceleration auxiliary electrode without affecting the stress during laser welding to the pattern area through which the electron beam passes, a beautiful image without vertical lines can be obtained. It turns out.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 3, in order from the rear to the front, there is a back electrode 1, a line cathode 2 as an electron beam source, and a vertical focusing electrode 3a.

3b, a vertical deflection electrode 4, an electron beam flow control electrode 6, horizontal focusing electrodes 6a and eb, a horizontal deflection electrode 7, an electron beam acceleration electrode 8, and a glass container 9.22 are arranged, and inside the glass container. The components are stored in a vacuum chamber. The operation of the image display device configured as described above will be described below. First, a line cathode 2 as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. (Although only four wires 2-2 are shown here, it is assumed that there are actually 16 wires). These line cathodes 2 are, for example, 10
An oxide cathode material is coated on the surface of a tungsten wire with a diameter of ~20 μm. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a for a fixed period of time. The back electrode 1 suppresses the generation of electron beams from line cathodes 2 other than the line cathode 2 that is controlled to emit electron beams for a certain period of time, which will be described later, and directs the generated electron beams only in the forward direction. It has the effect of pushing out toward the target. The back electrode 1 may be formed by a coating film of a conductive material adhered to the inner surface of the back wall of the glass pulp. Also, instead of these back electrode 1 and line cathode 2,
5 may also be used using a planar electron beam emitting cathode. The vertical focusing electrode 3a is a conductive plate 11 having a horizontally long slit 1o facing each of the line cathodes 2i to 2yo, and takes out the electron beam emitted from the line cathode 2 through the slit 1o, and vertically focus in a direction. The slit 1o may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes arranged horizontally at small intervals (nearly touching intervals). It may also be configured as a slit. Vertical focusing electrode 3
b is also similar. A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 10, and electrode portions 13a and 13b (see FIG. 3) are provided on the upper and lower surfaces of the insulating substrate 12, respectively. It is made up of things that were given.

Then, a vertical deflection voltage is applied between the opposing electrode portions 13a and 13b to deflect the electron beam in the vertical direction. In this configuration example, the pair of electrode parts 13a and 13b directs the electron beam from one line cathode 2 into one direction in the vertical direction.
Deflect to the position of 6 lines. The 16 vertical deflection electrodes 4 constitute 16 pairs of conductors corresponding to each of the 16 line cathodes 2, and as a result, the screen 21
The electron beam is deflected so as to draw 240 horizontal lines upward. Next, the electron beam flow control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of electron beam flow control electrodes 5 are arranged horizontally in parallel at predetermined intervals. In this configuration example, 320 control electrode conductive plates 1
58 to 15n are provided (only 10 are shown in the figure).

Each of the electron beam flow control electrodes 5 divides the electron beam horizontally into one picture element and extracts the electron beam, and
The amount of passage is controlled according to the video signal for displaying each picture element. Therefore, if 32,020 electron beam flow control electrodes 5 are provided, 320 picture elements can be displayed per horizontal line. In order to display images in color, each picture element is displayed with phosphors of three colors R, G, and H, and each electron beam flow control electrode 5 is provided with each of the R, G, and H images. Signals are applied sequentially. Furthermore, 320 sets of video signals for one line are simultaneously applied to the 320 electron beam flow control electrodes 5, so that one line of video is displayed at one time. A plurality of horizontal focusing electrodes 6a (320) are long in the vertical direction and face the slit 14 of the electron beam flow control electrode 5.
It is composed of a conductive plate 17 having slits 16, and focuses the electron beams of each picture element divided horizontally into a fine electron beam. The horizontal deflection ionization 7 is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal thickness unevenness voltage is applied between each of the conductive plates 18.
The electron beam for each picture element is deflected in the horizontal direction, and the R, G, and H phosphors are sequentially irradiated on the screen 21 to cause them to emit light. The deflection range is one picture element wide for each electron beam. The electron beam accelerating electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 21 with sufficient energy. . The screen 21 is constructed by coating the back surface of the glass container 9 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown).

The phosphors 20 are arranged in three colors R, G, and H for each slit 14 of the electron beam flow control electrode 5, that is, for each one horizontally divided electron beam. They are provided in pairs and are applied vertically in stripes. In FIG. 3, broken lines drawn on the screen 21 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and two-dot chain lines indicate each of the plurality of electron beam flow control electrodes 6. Shows the horizontal divisions displayed corresponding to. As shown in an enlarged view in FIG. 4, one section partitioned by these two has R, G, and B phosphors 20 for one pixel in the horizontal direction, and 16 lines in the vertical direction. It has a width of

Note that in the figure, A is one section in the vertical direction, and B is one section in the horizontal direction. The size of one section is, for example, 1 am in the horizontal direction and 16 tones in the vertical direction. Furthermore, the third
Please note that in the figure, the horizontal length is greatly expanded relative to the vertical direction for clarity.

Of course, only one pair of R, G, and H phosphors 20 for one picture element may be provided for one electron beam flow control electrode 5, that is, for one electron beam, and in that case, The electron beam flow control electrode 5 has R for two or more picture elements.
, G, and B image protection signals are persistently applied, and horizontal deflection is performed in synchronization with them.

As shown in FIG. 81, 16 electron beam accelerating electrodes 3o are set in a jig, and the electron beam acceleration assisting mechanism 32 is placed and positioned on the electron beam accelerating electrode 3o. At this time, since the electron beam acceleration auxiliary electrode 32 has a pattern with fine slits, in handling, if there is a step difference of 20 to 3 μm between adjacent patterns, vertical lines may appear in the image. As shown in the figure, a hole 36 smaller than the laser beam diameter is provided in the remaining portion 33 of the electron beam acceleration auxiliary electrode 32 to be welded to the electron beam acceleration electrode 30, and the laser is positioned in the hole 35. The electron beam acceleration electrode 3o and the electron beam acceleration auxiliary electrode 32 are welded together by positioning the electron beam acceleration electrode 3o and the electron beam acceleration auxiliary electrode 32 by laser irradiation 34.

Alternatively, as shown in FIG. 2, a slit pattern 36 with a pitch narrower than the laser beam diameter is formed in the remaining portion 33 of the electron beam acceleration auxiliary electrode 32, and the electron beam acceleration electrode 30 is welded by laser welding. Furthermore, the electron beam accelerating electrode unit is completed by placing and positioning the frame for the electron beam accelerating electrode and performing laser welding. After joining the accelerating electrode and the electron beam acceleration auxiliary electrode, when welding the frame, a hole (including a slit) smaller in diameter than the laser beam is made in the remaining part of the electron beam acceleration auxiliary electrode. By irradiating the electron beam with laser and welding, there is no distortion in the part of the electron beam acceleration auxiliary electrode through which the beam passes, so the beam does not bend, so a beautiful image display device with no vertical lines can be obtained. become. In addition, the electron beam accelerating electrode can be made of a thick plate-like rigid body and the electron beam accelerating auxiliary electrode can be made of a thin plate. Therefore, it is possible to provide an inexpensive image display device that does not require many man-hours.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a bonded state of an electron beam accelerating electrode and an electron beam accelerating auxiliary electrode according to an embodiment of the present invention, and FIG. 2 a
, b is an enlarged plan view of the electron beam acceleration auxiliary electrode, the third
The figure is an exploded perspective view of an image display element used in an image display device, Figure 4 is an enlarged plan view of the screen, Figure 6 is an exploded perspective view of the image display element showing a conventional electrode manufacturing method,
The figure is a sectional view of electrode manufacturing in a conventional example. 1... Back electrode, 21... Screen, 9, 22... Glass container, 8, 30...
... Electron beam acceleration electrode, 32 ... Electron beam acceleration auxiliary electrode, 33 ... Crosspiece, 35 ...
- Hole smaller than the laser beam diameter, 36...Slit smaller than the laser beam diameter.

Claims (1)

[Claims] A plurality of electrodes are provided between the back electrode and the screen, and components such as the back electrode, the plurality of electrodes, and the screen are inserted into a glass container and sealed. In a configuration in which an accelerating electrode, an electron beam acceleration auxiliary electrode, and a frame are laser welded to form an electron beam acceleration electrode unit, a hole smaller than the laser beam diameter is formed in advance in the laser welded part of the electron beam acceleration auxiliary electrode before laser bonding. 1. A method of manufacturing an image display device, comprising: