JPH0145934B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing electrodes for screen display devices in video equipment.

Conventional configuration and its problems An example of the basic configuration of a screen display device is shown in FIG. 1 and will be described. 1 is a back electrode, 2 is a cathode, 3 is a vertical focusing electrode, 4 is a vertical deflection electrode, 5 is a beam current limiting electrode, 6 is a horizontal focusing electrode, 7 is a horizontal deflection electrode, 8
is a beam accelerating electrode, and 9 is a screen.

The electron beam emitted from the cathode 2 is focused by a vertical focusing electrode 3 and vertically deflected by a vertical deflection electrode 4. Next, the beam current is intensity-modulated by the beam current limiting electrode 5, and then focused in the horizontal direction by the horizontal focusing electrode 6. Thereafter, the beam is deflected in the horizontal direction by the horizontal deflection electrode 7 and reaches the beam focusing electrode 8, where it is accelerated and collides with the screen 9 to emit light. The back electrode 1 serves to push the electron beam toward the screen 9. The above is the general principle of the screen display device. Next, a method for manufacturing the above device will be explained. The back electrode 1 to the screen 9 are fixed to each other by a coupling spacer 10 at a predetermined distance and positioned in the in-plane direction of the electrodes, and then housed in a vacuum glass container (not shown). The screen display device is completed. Here, positioning between the electrodes in the in-plane direction of the electrodes is achieved by accurately perforating each electrode 1, 3, 4, 5, 6, 7, and 8, the electron beam source holding means, and the accelerating electrode holding means (both not shown). This is done by a positioning pin 12 that passes through the positioning hole 11 and the positioning hole 11 in common. When fixing each electrode, due to the manufacturing process, a method is adopted in which the area from the back electrode 1 to the screen 9 is divided into several units, each unit is fixed, and then the units are fixed together. A beam current limiting electrode unit is shown and explained in FIG. 2.

A beam in which a soft iron whose surface is coated with glass frit is interposed as a spacer 10 between the beam flow limiting electrodes 5 and 5', and the electrodes 5 and 5' are fixed by firing at 450°C and then slowly cooling. A flow control electrode unit is constructed. The horizontal deflection electrode unit shown in FIG. 3 is constructed by firing and fixing the horizontal focusing electrode 6 spacers 10, 10, 10 and the horizontal deflection electrode 7. The above beam flow limiting electrode unit and water deflection electrode unit constitute electrical electrodes, so +
It must be divided into a part that applies a charge of , and a part that applies a charge of -. 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 unit is fired and fixed and then cut.

Figure 4 shows the pattern of the beam current limiting electrode 5, with 1
3 is a slit portion, 14 is a cut portion, and 15 is a crosspiece. FIG. 5 shows the pattern of the horizontal deflection electrode 7, where 16 is a slit portion 17 and a cut portion 18 is a crosspiece. The cut portions of the patterns shown in FIGS. 4 and 5 must be cut for the reasons stated above. However, because the slit width is extremely small and the plate thickness is extremely thin, this cutting is currently performed using a laser. However, in the above laser cutting method, spatter is scattered during laser irradiation and adheres to the base surface of the electrode, and when the units are combined and fired, the spatter causes errors in thickness accuracy. In addition, the scattered spatter has a major disadvantage in that black spots appear on the screen, and furthermore, it has the disadvantage that electrons are charged when it adheres to the electrode portion.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention provides a method for manufacturing a screen display device that allows spatter to be easily removed even if it is scattered during laser cutting, and provides a highly reliable and inexpensive screen display device. It is something.

Structure of the Invention The present invention prevents spatter during cutting by applying an inorganic adhesive to the laser irradiation surface of the beam flow limiting electrode or horizontal deflection electrode, and cleans the small amount of spatter that is scattered with an organic solvent. This is a manufacturing method in which spatter is removed using a method that has the unique effect of improving the image quality of the screen display device.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 6 shows laser cutting of the beam current limiting electrode unit in one embodiment of the present invention. In FIG. 6, 5 is a beam current limiting electrode, 10 is a spacer made of glass frit, and 5' is the other beam current limiting electrode.
Reference numeral 14 indicates a laser cut portion, and an inorganic adhesive 19 is thinly and uniformly applied to this portion by brushing or the like. The laser cut portion 14 is irradiated with a laser 20, and the cut portions lined up at equal pitches are cut and divided to form electrodes. By applying an inorganic adhesive 19 to the base part of the electrode during laser irradiation, spatter is prevented and adhesion to other base parts is minimized, and even a small amount of spatter is cleaned with an organic solvent. It can be easily washed off. As described above, by applying an inorganic adhesive to the laser irradiated area as in this example, it is possible to prevent the spatter from scattering, and when the unit is combined and fired, assembly can be performed without accuracy errors, and the image quality due to the spatter can be improved. There were no negative effects, resulting in stable image quality and high reliability.
The horizontal deflection electrode is also cut in the same manner as the beam flow limiting electrode.

Effects of the Invention As described above, the present invention provides a mass supply of highly reliable and inexpensive screen display devices that prevent spatter and stabilize image quality by applying an inorganic adhesive to the laser irradiated area. It became possible to do so.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the screen display device, Fig. 2 is a sectional view of the beam current limiting electrode unit, Fig. 3 is a sectional view of the horizontal deflection electrode unit, and Fig. 4 is a plan view of the beam current limiting electrode pattern. FIG. 5 is a plan view of the horizontal deflection electrode pattern, and FIG. 6 is a sectional view of the beam flow limiting electrode cut by laser. 2... cathode, 9... phosphor, 1, 3, 4,
5, 6, 7, 8... Electrode, 10... Spacer, 1
9...Inorganic adhesive, 20...Laser.

Claims (1)

[Claims] 1. A first step of firing an electrode structure in which a spacer is provided between the electrodes to fix the electrode and the spacer, and a second step of applying an inorganic adhesive to a predetermined portion on the electrode surface of the electrode structure. and a third step of irradiating a laser onto the electrode surface coated with the inorganic adhesive to form a through hole to form an electrode with a predetermined shape.
A method for manufacturing an electrode for a screen display device, characterized in that the step 1 and the fourth step of removing the inorganic adhesive are performed in sequence.