JP3586074B2 - Method for manufacturing fluorescent display tube - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a fluorescent display tube, and more particularly to a process for attaching a grid assembly to a glass substrate.
[0002]
[Prior art]
A fluorescent display tube is an electron tube that includes a transparent electrode in at least one direction of view, a basic electrode including an anode, a grid, and a cathode, and a metal component and a film formed by a thick film or thin film forming technology. is there.
Here, the grid is a metal mesh formed by photo-etching a conductive thin plate of stainless steel or the like into a turtle shape. The grid is located between the anode and the filament cathode, and when a positive potential is applied to the grid, the thermoelectrons emitted from the filament cathode are accelerated and diffused in a shower-like manner, and the fluorescence applied to the anode as uniformly as possible The body is made to collide with the body, and when a negative potential is applied to the body, electrons directed to the anode are blocked to prevent the phosphor on the anode from emitting light.
[0003]
FIG. 6 is a diagram illustrating the structure of a self-supporting grid type fluorescent display tube in which a grid is mechanically and electrically attached to a glass substrate. FIG. 6A is a plan view showing a state where the grid assembly 60 is attached to the glass substrate 10, and FIG. 6B is a cross-sectional view taken along the line CC of FIG. In FIG. 6, the filament cathode and the face glass are omitted.
As shown in FIG. 6B, a grid wiring 11, an anode 12 coated with a fluorescent material 13, and the like are provided on the glass substrate 10.
On the other hand, the grid assembly 60 includes a plurality of legs 63 at the end of the frame 61 such that the frame 61 and the grid mesh 62 formed by integrally etching the stainless steel thin plate maintain an appropriate gap with the glass substrate 10. A central support member 64 is provided at a substantially central position of the grid mesh 62.
Here, the plurality of leg portions 63 are obtained by bending a single stainless steel plate integrally formed with the frame 61 and the grid mesh 62. By fixing these on the glass substrate 10 using the conductive paste 73, the grid wiring 11 and the grid mesh 62 are electrically connected, and the grid mesh 62 is held at a predetermined distance from the glass substrate 10. .
The center support member 64 is formed by cutting three sides of the rectangle 65 at the center of the grid mesh 62 and bending the remaining one side downward. The center support member 64 is directly fixed on the glass substrate 10 using an adhesive member such as frid glass. Accordingly, the grid mesh 62 can be prevented from being bent and the gap between the grid mesh 62 and the glass substrate 10 can be appropriately maintained, and the grid assembly 60 can be more securely attached to the glass substrate 10.
[0004]
The manufacturing process of the self-supporting grid type fluorescent display tube as described above is generally as follows.
First, various wirings and electrodes such as the anode 12 are formed on the glass substrate 10 by a thick film forming technique or a thin film forming technique. A fluorescent material 13 is applied to the anode 12.
Next, the grid assembly 60 is attached to a predetermined position of the glass substrate 10, and the grid mesh 62 is fixed at a predetermined distance from the glass substrate 10.
After the grid assembly 60 is attached, a cathode filament (not shown in FIG. 6) is provided above the grid at a predetermined distance. Finally, the glass substrate 10 and the face glass (not shown in FIG. 6) are sealed.
[0005]
In such a manufacturing process, in the step of attaching the grid assembly 60 to the glass substrate 10, the grid assembly 60 is precisely positioned at a predetermined position with respect to the glass substrate 10 and mechanically from the viewpoint of the reliability of the fluorescent display tube. Must be firmly fixed.
The grid assembly 60 is attached by fixing the legs 63 and the center support member 64 on the glass substrate 10 with conductive paste and frit glass, respectively, and the conductive paste 73 fixing the legs 63 has conductivity. On the other hand, its adhesive strength is inferior to frit glass. Therefore, fixing the center support member 64 with the frit glass 70 is also important for securely attaching the grid assembly 60 mechanically.
[0006]
In the conventional manufacturing process, in the step of attaching the grid assembly 60, first, the leg 63 of the grid assembly 60 is aligned and placed at a predetermined position on the glass substrate 10. Then, while the conductive paste 73 is disposed on the legs 63, a rectangular window located at the center of the grid mesh 62 or a glass substrate 10 and the grid mesh The paste-like frit glass is arranged one by one from the gap with 62 using the dispenser 71. Thereafter, the above members are fired to fix the leg portions 63 and the center support member 64 on the glass substrate 10.
[0007]
[Problems to be solved by the invention]
However, such a conventional method has the following problems.
That is, since the frit glass paste is arranged one place at a time in a narrow space using the dispenser 71, the work is troublesome, and the frit glass is often attached to extra parts of the glass substrate 10 and the grid assembly 60. In particular, frit glass adhering to extra places causes a malfunction of the fluorescent display tube, resulting in a decrease in yield.
In addition, maintenance of the dispenser 71 and adjustment of the frit glass paste are required, and there is a problem that the number of working steps increases.
Therefore, the present invention fixes the center support member with frit glass without using a dispenser, increases the efficiency of the fluorescent display tube manufacturing process, particularly the process of attaching a grid to a glass substrate, and improves the reliability of the fluorescent display tube. The purpose is to let them.
[0008]
[Means for Solving the Problems]
The present invention, in order to achieve the above-mentioned object, provides a method for manufacturing a fluorescent display tube, wherein a frit glass is arranged in advance on a glass substrate at a position where the center support member of the grid assembly abuts before mounting the grid assembly. is there.
Specifically, as set forth in claim 1, the method for manufacturing a fluorescent display tube according to the present invention includes the steps of: forming an anode wiring, a grid wiring, a cathode wiring, and an anode on a glass substrate; A grid assembly comprising the grid, legs provided at ends of the grid, and a center support member provided at a substantially central position of the grid so as to be fixed at a predetermined distance from the substrate, is mounted on the glass substrate. A step of attaching the grid assembly to a predetermined position above, a step of providing a cathode at a predetermined distance above the grid assembly, and a step of sealing the glass substrate and the face glass, the step of attaching the grid assembly, Before corresponding to a substantially central position of the grid assembly when the grid assembly is mounted A step of pre-arranging frit glass for fixing the center support member on a glass substrate, a step of aligning and placing the grid assembly on the glass substrate, and firing the above-described member to set the center support member to the Fixing on a glass substrate.
By arranging the frit glass at a predetermined position on the glass substrate before placing the grid assembly on the glass substrate in this manner, it is possible to eliminate the step of arranging the frit glass using a dispenser in a narrow space. . Therefore, the work of arranging the frit glass on the glass substrate is simplified and the efficiency is improved, and at the same time, the frit glass is less likely to be adhered to an unnecessary portion.
[0009]
Here, the center support member provided in the grid assembly shall include all members that are mechanically fixed to the glass substrate by frit glass and support the grid mesh, maintain a distance between the glass substrate and the grid mesh, and The shape and material are not particularly limited as long as the grid assembly can be securely mounted on the substrate. Therefore, for example, the central support member may be configured by bending a part of the grid mesh as described in the related art, or may be provided by welding a metal piece to a substantially central position of the grid mesh. However, it is desirable to reduce the weight of the fluorescent display tube, as in the former case including the frame and the grid mesh.
[0010]
In the method for manufacturing a fluorescent display tube according to the present invention , in the step of attaching the grid assembly, the grid assembly is aligned and placed on the glass substrate, and then at least one leg of the grid assembly is connected to the grid assembly. A conductive paste is applied to the contacts of the grid wiring formed on the glass substrate, and the above-described member is baked to fix the center support member on the glass substrate.At the same time, the grid assembly and the grid wiring are separated from each other. It is characterized by connecting.
Thus, the center support member and the leg can be fixed to the glass substrate in one firing step.
[0011]
In the present invention, the step of previously disposing the frit glass for fixing the central support member on the glass substrate includes disposing the paste-like frit glass at a predetermined position using a dispenser, or a screen on which a predetermined pattern is formed. Alternatively, they may be arranged by printing using such as.
The invention described in claim 2 is characterized in that frit glass is arranged at a predetermined position on the glass substrate by printing.
By arranging the frit glass by printing in this way, the frit glass can be arranged at a plurality of places on the glass substrate in one process, and the operation efficiency is improved as compared with using a dispenser. In addition, the frit glass can be arranged with high accuracy, and the frit glass does not adhere to an extra place, thereby contributing to an improvement in yield.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1, 2 and 3 are views for explaining a method of manufacturing a fluorescent display tube according to the first embodiment of the present invention.
1 and 2 are views showing a state before the grid assembly 20 is placed on the glass substrate 10. FIG. In particular, FIG. 2 shows a cross section taken along line AA of FIG. FIG. 3 is a diagram illustrating steps of a method for manufacturing a fluorescent display tube according to the present embodiment.
[0013]
As shown in FIGS. 1 and 2, the grid assembly 20 includes a frame 21, a grid mesh 22, legs 23 provided at both ends of the frame 21, and a center support provided at a central position on the back side of the grid mesh 23. It consists of members.
Here, the frame 21, the grid mesh 22, and the legs 23 are integrally formed by etching a single stainless steel plate. At this time, the periphery of the frame 21 and the legs 23 has a thickness of about 1 μm, and the grid mesh 22 is configured to have a thickness of about 0.5 μm by half-etching. Further, the leg 23 is bent so as to have a height of about 0.8 mm. The legs 23 are provided on both sides of the frame 21 at intervals of about 5 mm in order to prevent the grid mesh 22 from bending.
A metal piece made of stainless steel and having a height of about 0.8 mm, which is the same height as the leg 23, is welded to the grid mesh 22 at a substantially central position as the center support member 24. The lower end of the central support member 24 is formed in an L shape so that the contact area with the glass substrate 10 is increased.
[0014]
A method of manufacturing a fluorescent display tube according to the present embodiment will be described with reference to FIG.
First, various wiring patterns including a grid wiring 11 and an anode 12 are formed on a glass substrate 10 by a thin film forming technique. Further, a fluorescent material 13 is applied on the cathode 12. In FIGS. 1 to 3, the illustration of the anode wiring and the cathode wiring is omitted.
Next, a frit glass 14a for fixing the center support member 24 of the grid assembly 20 is arranged at a predetermined position on the glass substrate 10 (FIG. 3A). In the present embodiment, when the grid assembly 20 is mounted on the glass substrate 10 in the future, the space between the two anodes 12 of the glass substrate 10 corresponds to a substantially central position of the grid assembly 20. Therefore, paste-like frit glass 14a is arranged at that position by printing using a screen pattern not shown in FIG.
[0015]
After the frit glass 14a is arranged, the grid assembly 20 is placed at a predetermined location while being positioned (FIG. 3B).
At this time, the legs 23 of the grid assembly 20 coincide with the grid wirings 11 on the glass substrate 10. In addition, the lower end of the center support member 24 matches the frit glass 14 a previously arranged on the glass substrate 10.
In this state, the conductive paste is disposed on the leg portions 23 of the grid assembly 20. Further, after the conductive paste is temporarily dried, frit glass is disposed on the legs 23 in one row on one side from above the conductive paste.
[0016]
Next, the grid assembly 20 is fixed to the glass substrate 10 by firing these members (FIG. 3C).
That is, by heating the assembled member in a furnace, the frit glass 14a disposed on the glass substrate 10 and the conductive paste and frit glass disposed on the legs 23 are melted. After cooling, as shown in FIG. 3C, the center support member 24 is fixed to the glass substrate 10 by the hardened frit glass 14b. Each leg 23 of the grid assembly 20 is electrically connected to the grid wiring 11 by the conductive paste 15 and is mechanically fixed to the glass substrate 10 though weak. Further, the legs 23 in one row on one side are more firmly fixed on the conductive paste 15 by the frit glass 16. As a result, the grid assembly 20 can be securely attached to the glass substrate 10.
[0017]
After the grid assembly 20 is attached to the glass substrate 10, the cathode filament 17 is attached above the grid mesh 22 at a predetermined distance. Finally, the glass substrate 10 and the face glass 18 are sealed (FIG. 3D).
[0018]
Since the frit glass 14a for fixing the center support member 24 is disposed at a predetermined position of the glass substrate 10 before the grid assembly 20 is attached in this manner, the frit glass 14a is placed in a narrow space one by one using a dispenser as in the related art. The step of disposing the glass can be omitted.
Further, since the paste-like frit glass 14a is arranged at a predetermined position by printing, even when a plurality of grid assemblies are mounted on a single glass substrate, the frit glass is provided at a plurality of locations corresponding to each grid assembly in one process. The glass can be arranged reliably. Therefore, the efficiency of the work of attaching the grid assembly 20 is particularly improved.
Although the frame 21, the grid mesh 22, and the leg 23 of the grid assembly 20 used in the present embodiment have been described as being formed by etching a single stainless steel plate, they are separately formed on the frame 21. Needless to say, a grid mesh 22 may be attached.
[0019]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the method for manufacturing a fluorescent display tube according to the present embodiment is substantially the same as that of the above-described first embodiment. However, the grid assembly 40 used in the present embodiment is provided with two central support members 44a and 44b, and the flit glass 50a and 50b are arranged at two places on the glass substrate 10 corresponding to the two. This is different from the first embodiment.
That is, as shown in FIGS. 4 and 5, the grid assembly 40 used in the present embodiment has a grid mesh 42 formed integrally with the frame 41 and a plurality of grid meshes formed integrally at both ends of the frame 41. It has a leg 43. The two central support members 44a and 44b are formed by providing an H-shaped cut in a portion substantially corresponding to the center position of the grid mesh 42 and bending a part of the grid mesh 42 downward.
[0020]
Similar to the first embodiment, the method for manufacturing the fluorescent display tube according to the present embodiment also includes forming the anode and various wiring patterns, and then mounting the grid assembly 40 on the glass substrate 10 in advance. The frit glass for fixing the center support members 44a and 44b is arranged on the glass substrate 10. In the present embodiment, paste-like frit glasses 50a and 50b are arranged at two places on the glass substrate 10 particularly corresponding to the two center support members 44a and 44b.
As a method of disposing the frit glasses 50a and 50b on the glass substrate 10, a dispenser may be used, but it is preferable to use a printing technique in terms of efficiency and accuracy.
[0021]
After arranging the frit glasses 50a and 50b at predetermined positions on the glass substrate 10, the grid assembly 40 is aligned and placed on the glass substrate 10. At this time, the center support members 44a and 44b abut against the frit glasses 50a and 50b, respectively.
In addition, a conductive paste is disposed on the leg portion 43 that contacts the grid wiring 11. Since the adhesive strength of the conductive paste is not as strong as that of frit glass, frit glass may be further disposed on the conductive paste in order to more securely fix the leg 43 to the glass substrate 10.
[0022]
The above members on which the frit glasses 50a and 50b and the conductive paste are arranged are placed in a furnace and fired. As a result, the frit glasses 50a and 50b are melted, and the center support members 44a and 44b are fixed to the glass substrate 10.
After firing, members such as a cathode filament are assembled, and finally, the glass substrate 10 and the windshield are sealed to obtain a fluorescent display tube.
[0023]
In the present embodiment, before placing the grid assembly 40, the frit glass 50a, 50b is previously arranged at a predetermined position on the glass substrate 10 corresponding to the central support members 44a, 44b. It is not necessary to arrange the frit glass one by one in a narrow space using the method.
Further, by using the printing technique, the frit glasses 50a and 50b can be more efficiently and accurately arranged on the glass substrate 10 in one process. This is particularly remarkable when one grid assembly includes two or more central support members as in the present embodiment.
[0024]
【The invention's effect】
According to the present invention, before the grid assembly is mounted, the frit glass is previously arranged at a position where the center support member of the grid assembly abuts on the glass substrate. Never be placed. Therefore, the operation of arranging the frit glass on the glass substrate is simplified and the efficiency is improved, and at the same time, the frit glass is less likely to be adhered to an unnecessary portion.
[0025]
According to the second aspect of the present invention, the frit glass is arranged at a predetermined position on the glass substrate by printing, so that the frit glass is arranged at a plurality of locations on the glass substrate in one process. The efficiency of the work of placing the frit glass can be improved. In addition, the frit glass can be arranged with high accuracy, and the frit glass does not adhere to extra places, which contributes to an improvement in the yield of the fluorescent display tubes and, in turn, to an improvement in reliability.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a relationship between a glass substrate and a grid assembly according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view for explaining the first embodiment.
FIG. 3 is a view for explaining steps of a method of manufacturing the fluorescent display tube according to the first embodiment.
FIG. 4 is a perspective view illustrating a relationship between a glass substrate and a grid assembly according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view for explaining the second embodiment.
FIG. 6 is a diagram illustrating a conventional technique.
[Explanation of symbols]
Reference Signs List 10: glass substrate, 11: grid wiring, 12: anode, 13: fluorescent material, 14a, 14b: frit glass, 15: conductive paste, 16: frit glass, 17: cathode, 18: face glass, 20, 40 ... Grid assembly, 21, 41 ... frame, 22, 42 ... grid mesh, 23, 43 ... leg, 24, 44a, 44b ... central support member, 50a, 50b ... frit glass.

Claims (2)

Forming anode wiring, grid wiring, cathode wiring and anode on a glass substrate;
A grid assembly including the grid, legs provided at ends of the grid, and a central support member provided at a substantially central position of the grid so that the grid is fixed at a predetermined distance from the glass substrate; Attaching a predetermined position on the glass substrate,
Providing a cathode at a predetermined distance above the grid assembly;
Sealing the glass substrate and the face glass,
Attaching the grid assembly,
Pre-arranging frit glass for fixing the center support member on the glass substrate corresponding to a substantially center position of the grid assembly when the grid assembly is attached;
Aligning and placing the grid assembly on the glass substrate;
Applying a conductive paste to a contact point between at least one of the legs of the grid assembly and grid wiring formed on the glass substrate;
Fixing the center support member on the glass substrate by firing the above-mentioned member, and connecting the grid assembly and the grid wiring at the same time . The method for manufacturing a fluorescent display tube according to claim 1,
Arranging the frit glass on the glass substrate,
A method for manufacturing a fluorescent display tube, characterized in that frit glass is printed in advance on a predetermined position of the glass substrate .

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