JPH0443370B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing an electrode unit in video equipment.

Conventional configurations and their problems Traditionally, 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 use for thin TVs. It was impossible to produce a Zion receiver. In addition, as flat display elements, EL display elements, plasma display devices,
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 yet been put into practical use. The aim was to achieve a device that could display color television images on a flat display device using electron beams, and the screen was divided vertically into multiple sections. The electron beam is deflected vertically to display multiple lines, and then it is divided horizontally into multiple sections and phosphors such as RGB are sequentially emitted in each section. A television image is displayed as a whole by controlling the amount of electron beam irradiation to the body using a color video signal. As shown in FIG. 1, the conventional image display element has, in order from the back to the front, a back electrode 1, a line cathode 2 as an electron beam source, vertical focusing electrodes 3, 3',
vertical deflection electrode 4, electron beam flow control electrode 5, horizontal focusing electrode 6, horizontal deflection electrode 7, horizontal focusing electrode 6',
An electron beam accelerating electrode 8 and glass containers 9 and 22 are arranged, and the components inside the glass container are housed and evacuated. A line cathode 2 serving as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. In the figure, only four (2A to 2D are shown) are provided. In this embodiment, it is assumed that 15 tubes are provided, and the number is 2i to 2yo. These wire cathodes 2 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 20 μm with an oxide cathode material. 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 emitted 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 of electrically conductive material applied to the inner surface of the rear wall of the glass bulb. Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used. Vertical focusing electrode 3
is a conductive plate 11 having horizontally long slits 10 facing each of the line cathodes 2A to 2Y, which takes out the electron beam emitted from the line cathode 2 through the slits 10 and focuses it in the vertical direction. . The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be substantially configured as a slit by a row of many through holes arranged horizontally at small intervals (nearly touching intervals). may have been done. The same applies to the vertical focusing electrode 3'. A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 10, and are each composed of conductors 13 and 13' provided on the upper and lower surfaces of an insulating substrate 12. ing. Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction. In this configuration example, the pair of conductors 13 and 13'
The electron beam from the line cathode 2 is vertically deflected to 16 line positions. The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and the electron beams are arranged so as to draw 240 horizontal lines on the screen 21. to deflect. Next, the electron beam flow control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and are arranged horizontally in parallel at predetermined intervals. In this configuration example, 320 control electrode conductive plates 15a 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 takes out the electron beam, and controls the amount of the electron beam passing in accordance with a video signal for displaying each picture element. . Therefore,
If 320 electron beam flow control electrodes 5 are installed, horizontal 1
320 pixels can be displayed per line.
Also, in order to display images in color, each picture element is
Display is performed using phosphors of three colors RGB, and each RGB video signal is sequentially applied to each electron beam flow control electrode 5. Furthermore, 320 sets of video signals for one line are simultaneously applied to the 320 electron beam flow control electrodes 5, and the video for one line is displayed at one time. The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (320 slits 16) facing the slits 14 of the electron beam flow control electrode 5, and each of the horizontally divided picture elements Each electron beam is focused horizontally into a fine electron beam. The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal deflection voltage is applied between each conductive plate 18 for each picture element. The electron beams are respectively deflected in the horizontal direction, and the RGB phosphors are sequentially irradiated on the screen 21 to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam. The accelerating electrode 8 is composed of a plurality of conductive wires 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 a glass container 9 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). A pair of phosphors 20 of three colors RGB is provided for each slit 14 of the electron beam flow control electrode 5, that is, for each horizontally divided electron beam. It is applied in vertical stripes. Screen 21 in Figure 1
The broken lines drawn in indicate the vertical divisions displayed corresponding to each of the plurality of line cathodes 2.
The dashed dotted lines indicate horizontal divisions displayed corresponding to each of the plurality of electron beam flow control electrodes 5. As shown in the enlarged view in Figure 2, one section partitioned by these two has RGB phosphors 20 for one pixel in the horizontal direction, and 16 in the vertical direction.
It has the width of a line. 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 mm in the horizontal direction and 16 mm in the vertical direction. Note that in FIG. 1, the length in the horizontal direction is greatly enlarged relative to the length in the vertical direction for clarity. Further, in this embodiment, only one pair of RGB phosphors 20 for one picture element is provided for one electron beam flow control electrode 5, that is, for one electron beam, but two or more picture elements are provided. In that case, the electron beam flow control electrode 5 has R.
GB video signals are applied sequentially, and horizontal deflection is performed in synchronization with them. The above is the general principle of the image display device. Next, a method for manufacturing the above device will be explained with reference to FIG. The back electrode 1 to the horizontal deflection electrode 7 are fixed to each other at a predetermined distance and positioned in the in-plane direction of the electrodes by a coupling spacer 23 made of a metal material, and then housed in a glass container. The image display device is completed. Here, the positioning in the electrode plane direction between the electrodes is 1, 2,
The electrodes 3, 3', 4, 5, 6, and 7, the electron beam source holding means, and the accelerating electrode holding means (both not shown) are drilled with precision in the positioning holes 24 and the positioning holes 24 are commonly penetrated therein. This is done by positioning pins 25. When fixing each electrode, the area from the electron beam flow control electrode to the horizontal deflection electrode is divided into several units due to the manufacturing process.
After fixing that unit, a method is adopted in which the units are fixed together. This is because the electron beam flow control electrode unit and the horizontal deflection electrode constitute electrical electrodes and must be divided into a part to which a positive 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.
The electron beam flow control electrode and the horizontal deflection electrode are usually baked and fixed to form a unit, and then the electrode pattern is divided by a method such as a laser. The conventional electron beam flow control electrode unit is
As shown in the figure, a coupling spacer 23 also made of 42-6 alloy is interposed between the electron beam flow control electrode 26 and vertical focusing electrode 27, both made of 42-6 alloy, and fixed by firing with a frit. As a result, the electron beam flow control electrode unit is completed. The electron beam flow control electrode 26 and the vertical focusing electrode 27 are connected to the coupling spacer 23 in order to apply voltage.
Apply insulation frit 28 to the front and back of the
An insulating layer is provided on the entire surface of the bonding spacer 23 by electrodeposition or the like at the ends in the thickness direction, and the electron beam flow control electrode 26 and the vertical focusing electrode are By applying an adhesive frit 29 for adhesion to 27 and firing, the unit is completed. However, with this conventional method, thickness unevenness occurs due to the application of the insulating frit and the adhesive frit, and as a result, the thickness accuracy becomes uneven, and even when fired, the thickness becomes uneven and the image is colored. Furthermore, the adhesion strength between the adhesive frit and the metal is weak, and the adhesive frit powder may fall off during handling, and if this fallen powder adheres to the electrode surface, it will appear as a black dot on the image. appear. Furthermore, when firing the adhesive frit, a thermal cycle of 450°C for 1 hour is applied, so the difference in thermal expansion between the metal and the adhesive frit may cause warping of the electrode or errors in the mutual positional accuracy of the electrode slits, resulting in color unevenness, horizontal lines, etc. in the image. It had many drawbacks, including many re-imaging defects, the need for Ag plating to prevent oxidation due to thermal cycling, and increased costs due to the number of steps required for thermal cycling.

In order to eliminate the above-mentioned drawbacks, the inventors of the present application have developed an image display device having the configuration shown in FIGS. 5 and 6. This is done by using an insulating material such as glass as the coupling spacer 30 to connect the electrode and the coupling spacer in the electron beam flow control electrode, horizontal deflection electrode, or other electrode, and by using a method such as a laser to connect the electrode and spacer for each unit. After joining and forming each unit, it holds multiple electrodes,
After positioning with a reference hole (not shown) with the electron beam flow control electrode 31 on the bottom and the coupling spacer 30 on top, the laser 32 passes through the coupling spacer 30 from above the coupling spacer 30 to form the electron beam flow control electrode. Metal part 3 other than the hole 33 in the crosspiece part 31
4. The electron beam flow control electrode 31 and the glass bonding spacer 3 are melted by melting the surface and melting the contact portion 35 of the glass bonding spacer 30 or the portion that is not in complete contact with the reflected heat.
0 is combined. The integrated electron beam flow control electrode 31 and glass bonding spacer 30 are positioned above the vertical focusing electrode 36 using a reference hole, as shown in FIG. 6, with the vertical focusing electrode 36 facing down. At this time, the hole 33 of the electron beam flow control electrode 31 and the hole 37 of the vertical focusing electrode 36 no longer overlap, and the laser 38 is emitted from the hole 33 of the electron beam flow control electrode 31.
is passed through the glass bonding spacer 30 to the surface 4 of the metal portion 39 of the vertical focusing electrode 36.
At the same time as melting the glass bonding spacer 30, the electron beam flow control electrode 31, the glass bonding spacer 30, and the vertical focusing electrode 36 become an integrated unit.
As a result, since no frits are used, the thickness accuracy is uniform, there is no color unevenness, there is no falling of frit powder, there are no black spots, and there is no heat cycle, there is no warping, and there are no horizontal line defects. This eliminates the need for Ag plating to prevent oxidation, resulting in extremely beautiful images, and since there is no need for heat cycles, costs can be reduced without the need for Ag plating to prevent oxidation. However, even in such a configuration, since the adhesion strength between the insulator and the metal is weak, there is a concern that the insulator and the metal may peel off during handling.

Purpose of the Invention In view of the above-mentioned problems, the present invention uses an insulator as a coupling spacer, metalizes the coupling spacer, and joins it to an electrode by laser or spot welding at room temperature. The purpose is to provide a large quantity of inexpensive image display devices that are free from image defects such as unevenness, horizontal lines, and black spots.

Structure of the Invention The method for manufacturing an electrode unit of the present invention is a method for manufacturing an electrode unit in which an electrode and a spacer are combined using a laser to form an electrode unit. After that, the electrode and the spacer are bonded using a laser to form an electrode unit, and because the bonding strength is improved and the bonding is carried out at room temperature, there is no need for a frit, and the thickness accuracy is improved. It becomes uniform, there is no color unevenness, no frit powder falls off, there are no black spots, and there is no need to apply heat cycles, there is no warping, there are no horizontal line defects, and very beautiful images are obtained, and at the same time, heat cycles are not required. Furthermore, since there is no need for Ag plating for oxidation prevention, it has the unique effect of reducing costs.

DESCRIPTION OF EMBODIMENTS Hereinafter, a method for manufacturing an electrode unit of the present invention will be described with reference to the drawings. 7 to 9 show a method of manufacturing an image display device according to an embodiment of the present invention. In FIG. 7, only the portion 41 through which the beam passes is made into a hole, leaving the crosspiece portion and the surrounding portion. After applying a base treatment such as ITO or Cr to the front and back surfaces of the glass bonding spacer 42 manufactured by a method such as etching, Ni and
Metallization 43 is performed by forming a Cr film by electroless plating or vapor deposition. In this case, the metallization may be made of Cr.ITO.Ni alone.
As shown in the figure, after positioning the electron beam flow control electrode 44 with a reference hole (not shown), a glass bonding spacer 42 is inserted from above the electron beam flow control electrode 44.
A laser is irradiated onto the metalized portion 43 of the electron beam flow control electrode 44 and the glass bonding spacer 4.
2 are welded together to form a single unit. Next, the integrated electron beam flow control electrode 44 and glass bonding spacer 42 are inverted and positioned using the reference hole so that the glass bonding spacer 42 is on top, and the vertical focusing electrode 45 is placed on top of this as a reference. Position with the hole,
Glass bonding spacer 4 from above the vertical focusing electrode 45
A laser beam is irradiated onto the metalized portion on the back side of the metallized portion 43 of No. 2, so that the vertical focusing electrode 45 and the glass bonding spacer 42 are integrated. In other words, the electron beam flow control electrode 44, the glass bonding spacer 42, and the vertical focusing electrode 45 are combined into an integrated unit. The horizontal deflection electrode is also made into a unit in the same manner as the electron beam flow control electrode. If we divide the slits of this unitary electron beam flow control electrode and horizontal deflection electrode using a laser as described above, we can
It can be divided into a part to which a (plus) charge is applied and a part to which a - (minus) charge is applied. The conditions for laser welding the metallized glass bonded spacer and the electrode are: voltage: 260 to 280V, current: around 1A, lens focus: 30mm, feed: 1mm/sec.

Laser irradiation may be performed continuously or intermittently to form a bond.
Furthermore, metallization may be performed on the entire surface of the crosspiece as shown in FIG.
7, and only the metallized portions are welded together using a laser, the same effect can be obtained. Further, in this embodiment, a glass-bonded spacer having holes formed only in the portion through which the electron beam passes is used, but a method may also be used in which a plurality of plates are metallized and parallel to only the bar portions of the electrodes.

Effects of the Invention As described above, in the method for manufacturing an electrode unit of the present invention, after metallizing the front and back surfaces of a bonding spacer made of an insulator between electrodes, the bonding spacer and the electrode are bonded using a laser. By doing so, it can be made into an electrode unit, and it can be joined at room temperature.Therefore, since no adhesive frit is used, it can be joined without thermal cycling, which eliminates electrode slits that occur due to differences in thermal expansion due to thermal cycling. Pitch deviations caused by expansion and contraction of the electrodes are eliminated, as well as warping of the electrodes, improving accuracy and eliminating horizontal lines or color unevenness in images. Furthermore, it is possible to eliminate equipment such as an electric furnace necessary for applying a heat cycle. Also, there is no need for Ag plating to prevent oxidation of the electrode. Furthermore, by using a laser, bonding of the electrodes and division of the electrodes into slits can be performed consistently with the laser, resulting in a significant reduction in the number of man-hours. Furthermore, because it is metalized,
It also improves adhesive strength and prevents it from peeling off during handling. As described above, the image display device of the present invention can provide a large quantity of inexpensive image display devices with improved image quality and significant cost reduction, and has great practical effects.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of an image display element used in an image display device, Figure 2 is an enlarged plan view of a screen, Figure 3 is an exploded perspective view of an electrode, Figure 4 is a sectional view of a conventional electrode, and Figure 4 is a cross-sectional view of a conventional electrode. FIG. 5 is a cross-sectional view of a conventional electrode unit bonded state, FIG. 6 is a cross-sectional view of a conventional electrode unit bonded state, FIG. 7 is a perspective view of a metalized bonding spacer according to an embodiment of the present invention, and FIG. 8 is a cross-sectional view of a conventional electrode unit bonded state. FIG. 9 is an exploded perspective view showing a bonded state of the electrode unit in one embodiment of the invention, and FIG. 9 is a perspective view of a metalized coupling spacer in another embodiment. 1... Back electrode, 21... Screen, 9, 2
2...Glass container, 23...Coupling spacer, 3
0,42...Insulating material binding spacer, 43,46...
...Metalization.

Claims (1)

[Claims] 1. In a method for manufacturing an electrode unit in which an electrode and a spacer are bonded using a laser to form an electrode unit, the bonding surface of the spacer with the electrode is metallized, and then the electrode and the spacer are bonded using a laser. A method for manufacturing an electrode unit.