JP3736121B2 - Fluorescent display tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention connects the wiring layer formed on the inner surface of the anode substrate and the anode conductor formed on the insulating layer on the wiring layer by filling the through-hole formed in the insulating layer with the conductive paste. The present invention relates to a fluorescent display tube having a structure.
[0002]
[Prior art]
FIG. 3 is a partially cut perspective view showing the entire structure of a generally known fluorescent display tube, and FIG. 4 is a partial sectional view of the fluorescent display tube.
As shown in FIG. 3, the fluorescent display tube 1 has a box-shaped envelope 2 whose inside is kept airtight in a high vacuum state. The envelope 2 includes an anode substrate 3 having insulating properties, a front plate 4 having insulating properties and translucency, and a lid-like container portion 6 formed by a frame-shaped side plate 5 having insulating properties. I have.
[0003]
As shown in FIG. 4, a wiring layer 7 made of an Al thin film is formed in a predetermined pattern shape corresponding to the display pattern 8 on the inner surface of the anode substrate 3 in the envelope 2. An insulating layer 9 is laminated on the wiring layer 7. The insulating layer 9 is formed, for example, by thick film printing of an insulating glass paste made of a powder of lead borosilicate glass, an inorganic material powder such as a heat-resistant pigment, and a vehicle. A through hole 11 is formed in a portion of the insulating layer 9 forming the segment 10 of the display pattern 8 so that the wiring layer 7 is exposed. A portion of the through hole 11 where the wiring layer 7 is exposed is filled with a conductor layer 12 by printing a conductor paste.
[0004]
As shown in FIG. 4, the anode conductor 13 is divided and formed for each segment 10 of the display pattern 8 on the same surface of the insulating layer 9 so as to be electrically connected to the wiring layer 7 via the conductor layer 12. Each anode conductor 13 is formed, for example, by thick film printing of graphite paste or Al paste made of graphite powder and an inorganic binder. On each anode conductor 13, a phosphor layer 14 is formed in the shape of the segment 10 of the display pattern 8 by printing a phosphor paste made of phosphor powder and a vehicle. Thereby, the anode 15 for each segment 10 of the display pattern 8 is formed. A grid electrode 16 is provided above the anode 15, and a filamentary cathode 17 is provided above the grid electrode 16.
[0005]
By the way, conventionally, when manufacturing the fluorescent display tube 1 having the above-described structure, Ag-powder in which Ag powder, glass powder, and a vehicle are mixed at a predetermined ratio as a paste for filling the conductor layer 12 filling the through-hole 11 is used. A PbO-based glass paste was used. An example of the blending ratio is Ag powder 80 to 97 wt% and PbO glass frit 3 to 20 wt%.
[0006]
When the fluorescent display tube 1 is manufactured, first, the anode 15 forming the display pattern 8 partitioned into a predetermined shape is formed on the anode substrate 3. Specifically, the wiring layer 7 corresponding to the display pattern 8 is formed by patterning the Al paste on the anode substrate 3.
[0007]
Next, the insulating layer 9 with the through hole 11 is printed on the Al wiring layer 7 and baked at 550 to 600 ° C., for example. Then, the through hole 11 of the insulating layer 9 is filled with the aforementioned Ag—PbO glass paste to form a conductor layer 12, and a graphite paste or an Al paste is printed on the conductor layer 12 to form the anode conductor 13. . Thereafter, for example, baking is performed at 550 to 600 ° C. Subsequently, the phosphor layer 14 is formed on the anode conductor 13 by printing and fired at 500 ° C. or lower.
[0008]
Next, a low-melting glass paste is applied to the outer peripheral portion of the anode substrate 3 on which the anode 15 is formed, and is fired at 500 ° C. or lower. Subsequently, an intermediate paste for fixing the mesh-like grid electrode 16 to the anode substrate 3 is applied onto the anode substrate 3. Then, the grid electrode 16 is placed on the intermediate paste, and the grid electrode 16 is fixed to the anode substrate 3.
[0009]
Here, a frame on which the filamentary cathode 15 is stretched is assembled in a separate process from the above operation. Then, the bottom peripheral surface of the side plate 5 in the container part 6 is positioned on the outer peripheral part of the anode substrate 3 to which the low melting point paste is applied, and the anode substrate 3 and the container part 6 are pressurized from above and below and fired at 500 ° C. or less. Then, the envelope 2 is assembled by sealing between the outer peripheral portion of the anode substrate 3 and the container portion 6. Thereafter, the inside of the envelope 2 is evacuated to a high vacuum state and sealed to complete the fluorescent display tube 1.
[0010]
In manufacturing the fluorescent display tube 1, an insulating layer 9 with a through hole 11 is formed on the wiring layer 7 made of an Al thin film by printing. If only one insulating layer 9 is used, dust or the like is generated during printing. A pinhole is formed by the intrusion, and the wiring layer 7 and the anode conductor 13 are conducted through the pinhole to cause a problem in insulation. For this reason, the insulating paste is printed twice on the wiring layer 7 to make the insulating layer 9 have a two-layer structure, thereby addressing the above-mentioned insulation problem.
[0011]
By the way, in the baking process of the insulating layer 9 described above, the Al wiring layer 7 exposed in the through hole 11 is oxidized, and an oxide film of aluminum oxide (Al ₂ O ₃ ) is formed on the surface. Since this oxide film is insulative, the wiring layer 7 and the conductive paste filled in the through hole 11 are not electrically connected as they are.
[0012]
Therefore, conventionally, in the aging process after the assembly of the fluorescent display tube 1 is completed, a high voltage pulse is applied between the cathode and the anode for a short time, thereby destroying the oxide film on the surface of the wiring layer 7. .
[0013]
Although it is considered that the thickness and area of the oxide film differ depending on the location, it cannot be determined from the appearance. Therefore, the above-described destruction of the oxide film by a high voltage has been performed under certain conditions.
[0014]
However, even if the through-hole 11 is turned on once at a high voltage, it may not be turned on at a low voltage of about 12 V, which is the driving voltage of the fluorescent display tube 1, and the conduction of the conductor paste in the through-hole 11 is incomplete.
[0015]
[Problems to be solved by the invention]
As described above, the conventional fluorescent display tube has a problem that the surface of the wiring layer 7 is covered with the Al oxide film during the baking process of the insulating layer 9, and the Al oxide film tends to cause poor conduction. Further, when repeated baking is performed at a temperature of 550 to 600 ° C., the PbO of the Ag—PbO-based glass paste is separated, and a PbO glass film is formed on the surface. The conductor 13 could not be conducted through the conductor layer 7.
[0016]
In order to solve the above problem, the applicant has already filed an application using a conductive paste that breaks the oxide film on the Al wiring layer 7 by a chemical reaction using an activator such as Zn or Sb as a filling paste. (Japanese Patent Laid-Open No. 7-29414 (Patent No. 2677161)).
[0017]
This conductor paste is a mixture obtained by adding 1 to 20% Zn and / or Sb as an activator in addition to Ag powder, glass powder and vehicle. When this conductor paste is used as a hole filling paste, the oxide film on the Al wiring layer 7 is destroyed by a chemical reaction, and acts as a catalyst for promoting alloying of Al in the wiring layer 7 and Ag in the conductor paste. .
[0018]
However, when the conductor paste containing Zn or Sb as an activator is used as a paste for filling holes, in manufacturing the fluorescent display tube 1 as shown in FIG. 3 and FIG. Since it is performed a plurality of times, the chemical reaction of the activator in the conductor paste becomes excessive. As a result, the entire Al thin film is eroded, the conductor layer 12 in the through hole 11 is reduced, and the nest is vacated, which causes a problem of poor conduction.
[0019]
This problem is not limited to the case where the fluorescent display tube 1 shown in FIGS. 3 and 4 is manufactured, but also occurs when the three-dimensional grid-equipped fluorescent display tube 21 shown in FIGS. 1 and 2 is manufactured. The configuration of the three-dimensional grid-equipped fluorescent display tube 21 will be described in detail later.
[0020]
In the fluorescent display tube 21 with a three-dimensional grid shown in FIGS. 1 and 2, after the insulating layer 9 is printed and baked, printing and drying are repeated to form a partition wall and a phosphor layer 14 having a predetermined height. Thereafter, baking is performed at a temperature of 550 to 600 ° C. Therefore, since the number of firings at 550 to 600 ° C. is increased as compared with the case of manufacturing the fluorescent display tube 1 shown in FIGS. 3 and 4, more conduction defects are caused.
[0021]
In addition, the conventional conductor paste used as the hole filling paste is mainly composed of Ag, which is a different metal from the wiring layer 7 made of Al thin film, so that the familiarity with the wiring layer 7 is not optimal, and the Al conductor paste Compared to the high cost.
[0022]
Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a fluorescent display tube that can ensure conduction between a wiring layer and an anode conductor.
[0023]
[Means for Solving the Problems]
In order to achieve the above object, a fluorescent display tube according to the invention of claim 1 includes an Al wiring layer formed on the inner surface of the anode substrate,
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A paste containing at least one of an organic metal or a low softening point glass frit with a softening point temperature of 300 to 400 ° C. in an Al powder having an average particle diameter of 1 to 10 μm is filled in the through hole, and is 550 ° C. to 600 ° C. A conductor layer formed by firing ;
An anode conductor formed so as to connect the Al wiring layer electrically to conductor layer,
And a phosphor layer formed on the anode conductor.
[0024]
The fluorescent display tube according to the invention of claim 2 comprises an Al wiring layer formed on the inner surface of the anode substrate,
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A paste in which an Al powder having an average particle diameter of 1 to 10 μm and a low softening point glass frit having a softening point temperature of 300 to 400 ° C. and a vehicle is mixed is filled in the through hole and fired at 550 ° C. to 600 ° C. A conductor layer comprising:
An anode conductor formed so as to connect the Al wiring layer electrically to conductor layer,
And a phosphor layer formed on the anode conductor.
[0025]
According to a third aspect of the present invention, in the fluorescent display tube according to the second aspect, the conductor layer comprises 40 to 80% Al powder, 3 to 40% low melting point glass frit having a softening point temperature of 300 to 400 ° C , and 15 to 30 vehicles. % Of the conductive paste mixed at a rate of 550 ° C. to 600 ° C.
[0026]
The fluorescent display tube according to the invention of claim 4 is an Al wiring layer formed on the inner surface of the anode substrate;
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A conductor layer in which a paste in which an organic Ti compound and a vehicle are mixed with Al powder having an average particle diameter of 1 to 10 μm is filled in the through hole and fired at 550 ° C. to 600 ° C . ;
An anode conductor formed on the conductor layer so as to be electrically connected to the Al wiring device ;
And a phosphor layer formed on the anode conductor.
[0027]
According to a fifth aspect of the present invention, in the fluorescent display tube of the fourth aspect, the conductor layer is composed of 60 to 80% Al powder having an average particle diameter of 1 to 10 μm , 3 to 25% of an organic Ti compound, and 15 to 25% of a vehicle. The conductive paste mixed at a ratio is fired at 550 ° C. to 600 ° C.
[0028]
A fluorescent display tube according to the invention of claim 6 is an Al wiring layer formed on the inner surface of the anode substrate;
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A paste in which an Al powder having an average particle diameter of 1 to 10 μm and a low softening point glass frit having a softening point temperature of 300 to 400 ° C., an organic Ti compound, and a vehicle is filled in the through hole is filled into the through holes. A conductor layer fired at ℃ ,
An anode conductor formed on the conductor layer so as to be electrically connected to the Al wiring device ;
And a phosphor layer formed on the anode conductor.
[0029]
According to a seventh aspect of the present invention, in the fluorescent display tube according to the sixth aspect, the conductor layer has a low melting point glass frit 3 having an average particle diameter of 40 to 80% Al powder having a particle size of 1 to 10 μm and a softening point temperature of 300 to 400 ° C A conductive paste mixed at a ratio of ˜40%, an organic Ti compound of 3-25%, and a vehicle of 15-25% is fired at 550 ° C. to 600 ° C.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
In the present embodiment, in the fluorescent display tube 1 shown in FIG. 3 and FIG. 4, the material of the filling paste for filling the through hole 11 to form the conductor layer 12 is different from the conventional material. Since the basic structure of the fluorescent display tube 11 is as shown in FIGS. 3 and 4, the description thereof is omitted.
[0033]
The hole-filling paste used in the fluorescent display tube 1 of the present embodiment is made of an Al conductor paste containing Al powder as a main component and at least one of a low softening point glass frit or an organic metal in the Al powder.
[0034]
More specifically, the Al conductor paste is a mixture of Al fine powder mixed with a low softening point glass frit and a vehicle, Al fine powder mixed with an organic Ti compound as an organic metal and a vehicle, Al fine powder with a low softening point glass frit. , An organic Ti compound, and a vehicle.
[0035]
And when using Al conductor paste which mixed low softening point glass frit and vehicle in Al fine powder as paste for hole filling, for example, Al fine powder 40-80%, low softening point glass frit 3-40%, vehicle 15-30% It is blended in the ratio.
[0036]
When Al conductor paste in which organic Ti compound as an organic metal and a vehicle are mixed in Al fine powder is used as a hole filling paste, for example, the ratio of Al fine powder 60 to 80%, organic Ti compound 3 to 25%, vehicle 15 to 30% It is blended with.
[0037]
When Al conductive paste prepared by mixing low softening point glass frit, organic Ti compound and vehicle in Al fine powder is used as a paste for filling holes, Al fine powder is 40 to 80%, low softening point glass frit is 3 to 40%, organic Ti compound 3 -25% and vehicle 15-30%.
[0038]
When the average particle size of the Al fine powder, which is the main component of the hole filling paste, is too small, it may agglomerate or become a state close to alumina, and the surface oxide film may be destroyed at a low temperature (550 to 600 ° C.). Can not.
[0039]
Therefore, as the Al fine powder, nitrogen atomized powder is used in which fine powder is obtained by injecting liquid Al in a nitrogen atmosphere. And this nitrogen atomization has obtained Al fine powder with an average particle diameter of 1-10 micrometers, More preferably, 2-5 micrometers. By using this nitrogen atomized Al fine powder, an oxidation reaction occurs at about 540 ° C., the oxide film on the surface of the Al particles and the oxide film on the Al wiring layer 7 are destroyed, and good conductivity can be obtained. Moreover, since this reaction does not proceed excessively even if the firing is repeated at 550 to 600 ° C., conduction between the wiring layer 7 of the Al thin film and the anode conductor 13 can be maintained.
[0040]
The low softening point glass frit in the Al conductor paste is a glass having a softening point of 300 to 400 ° C., for example, PbO-based glass, phosphoric acid-based glass, Bi ₂ O ₃ -based glass, or the like.
[0041]
In addition, the vehicle contained in the Al conductor paste is a viscous liquid in which an organic polymer is dissolved in an organic solvent, which is necessary for screen printing a conductor having a predetermined pattern shape, and is removed during firing. is there.
[0042]
Next, FIG. 1 is a partially cut perspective view of a fluorescent display tube with a three-dimensional grid in which the Al conductor paste described above is used as a paste for filling holes, and FIG. 2 is a partial sectional view of the fluorescent display tube with the three-dimensional grid. It should be noted that the same components as those in the fluorescent display tube of FIGS.
[0043]
As shown in FIG. 1, the three-dimensional grid-equipped fluorescent display tube 21 has a box-shaped envelope 2 whose inside is kept airtight in a high vacuum state. The envelope 2 includes an anode substrate 3 having insulating properties, a front plate 4 having insulating properties and translucency, and a lid-like container portion 6 formed by a frame-shaped side plate 5 having insulating properties. I have. In the envelope 2, each of the substrates 2, 3, and 4 is formed of a glass substrate, and the container portion 6 is sealed with a sealing agent on the outer peripheral portion of the anode substrate 3, and after being evacuated, the inside is sealed. It is kept airtight in a high vacuum state.
[0044]
As shown in FIG. 2, a wiring layer (anode wiring layer, grid wiring layer) 7 made of an Al thin film conductive material is formed in a predetermined pattern shape on the inner surface of the anode substrate 3. On the anode substrate 3, an insulating layer 9 having a through hole 11 is formed so as to cover the Al wiring layer 7. The through hole 11 is filled with the conductor layer 12 by printing the Al conductor paste described above.
[0045]
As shown in FIG. 2, a conductor paste is printed in the shape of a segment on the conductor layer 12 of the through hole 11, and the portion constitutes an anode conductor 13. The anode conductor 13 is formed by, for example, thick film printing of graphite paste or Al paste made of graphite powder and an inorganic binder. On the anode conductor 13, a phosphor layer 14 is formed in the shape of the segment 10 of the display pattern 8 by printing a phosphor paste made of phosphor powder and a vehicle.
[0046]
As shown in FIG. 2, partition walls 22 are formed around the phosphor layer 14 by printing an insulating paste (for example, lead-based glass frit). The barrier ribs 22 are formed higher than the phosphor layer 14 so as to surround the phosphor layer 14. Thereby, the anode 23 divided for every segment 10 is formed. Each segment 10 is integrally connected by a partition 22 in one display pattern 8 unit.
[0047]
As shown in FIG. 2, the partition wall 22 for each display pattern 8 is led out by extending a predetermined distance from one segment 10 toward the outside of the anode substrate 3. A grid electrode 24 is printed on the top of the partition wall 22 for each display pattern 8 by printing an Al paste to form a three-dimensional grid 25.
[0048]
As shown in FIG. 2, a plurality of filament-like cathodes 17 are stretched over the display pattern 8 in the envelope 2 so as to face the display pattern 8. Each cathode 17 emits electrons toward the display pattern 8 by heating control.
[0049]
The three-dimensional grid-equipped fluorescent display tube 21 having the above-described configuration is manufactured according to the procedure described below.
First, a wiring layer (anode wiring layer, grid wiring layer) 7 having a predetermined pattern shape is printed and formed on the anode substrate 3 with an Al paste. Next, an insulating layer 9 with a through hole 11 is printed on the anode substrate 3 so as to cover the Al wiring layer 7.
[0050]
At that time, the insulating layer 9 is printed and formed so that the through holes 11 are located at the connection portions between the segments 10 constituting the display pattern 8 and the grid electrodes 24 and the grid wiring layer (not shown). Then, for example, baking is performed at 550 to 600 ° C.
[0051]
Next, the Al conductor paste described above is printed in the through hole 11 of the insulating layer 9 located in each segment 10, and the conductor layer 12 is formed by filling the through hole 11 and dried. At the same time, the Al conductor paste described above is also printed in the through hole located at the wiring location between the grid electrode 24 and the grid wiring layer (not shown), and the through hole is filled and dried. Subsequently, the second insulating layer 9 is printed and baked at, for example, 550 to 600 ° C.
[0052]
Thereafter, a graphite paste or an Al paste is printed in the shape of the segment 10 on the conductor layer 12 in which the through hole 11 is filled, and the anode conductor 13 is formed. Subsequently, the partition wall 22 is printed and formed with an insulating paste with a predetermined width. Thereby, the anode 23 divided for every segment 10 is formed. At this time, printing of unillustrated partition walls and grid connection partitions is also performed in the same process. Then, the phosphor layer 14 is printed and formed in the shape of the segment 10 on the anode conductor 13. Then, it bakes at 500 degrees C or less.
[0053]
In addition, since printing of the partition 222 by the said insulating member has a restriction | limiting in the height which can be printed at once, printing and drying are repeated in multiple times. As a result, the partition walls 22 in the shape of the display pattern 8 divided for each segment 10, the unillustrated partition walls for partitioning, and the grid connection partition walls are uniformly printed at a predetermined height.
[0054]
Next, an Al paste is printed on the top of each partition 10 (including unillustrated partition walls and grid connection partitions) 22 to form grid electrodes 24. At the same time, the grid electrode 24 and a grid wiring layer (not shown) are electrically connected by printing Al paste. Then, for example, baking is performed at 550 to 600 ° C.
[0055]
Here, as in the case of manufacturing the fluorescent display tube 1 shown in FIGS. 3 and 4, a frame on which the filamentary cathode 15 is stretched is assembled in a separate process from the above operation. Then, the bottom peripheral surface of the side plate 5 in the container part 6 is positioned on the outer peripheral part of the anode substrate 3 to which the low melting point paste is applied, and the anode substrate 3 and the container part 6 are pressurized from above and below and fired at 500 ° C. or less. Then, the envelope 2 is assembled by sealing between the outer peripheral portion of the anode substrate 3 and the container portion 6. Thereafter, the inside of the envelope 2 is evacuated to a high vacuum state and sealed, whereby the three-dimensional grid-equipped fluorescent display tube 21 is completed.
[0056]
As described above, in the present embodiment, as the hole-filling paste for filling the through-hole 11 to form the conductor layer 12, a conductor paste mainly composed of Al same as the metal forming the wiring layer 7 is used. Therefore, the wiring layer 7 is familiar and the conduction between the wiring layer 7 and the anode conductor 13 can be reliably performed.
[0057]
Here, when the conventional conductor paste (Ag—PbO-based glass paste, Ag conductor paste containing Zn or Sb activator) and the Al conductor paste of the present embodiment are used as the filling paste, for example, 1 at 560 ° C. When fired twice, the defect rate is 5% in the conventional Ag-PbO-based glass paste, whereas the defect rate can be 0% in the Al conductor paste of the present embodiment. Further, when fired three times at 560 ° C., the defect rate is 50% in the Ag conductor paste containing the activator, whereas the defect rate can be reduced to 0% in the Al conductor paste of the present embodiment.
[0058]
Al, which is the main component of the conductor paste of the present embodiment, uses Al atomized powder with an average particle diameter of 1 to 10 μm that is nitrogen atomized. Therefore, an oxidation reaction occurs at about 540 ° C., and an oxide film on the surface of the Al particles and The oxide film on the Al wiring layer 7 is destroyed, and good conductivity can be obtained. Moreover, since this reaction does not proceed excessively even if the firing at 550 to 600 ° C. is repeated, the conduction between the Al thin film wiring layer 7 and the anode conductor 13 can be maintained.
[0059]
Furthermore, according to the conductor paste mainly composed of Al according to the present embodiment, stable resistance can be obtained at a lower cost than the conductor paste mainly composed of Ag. As a result, an inexpensive fluorescent display tube can be provided.
[0060]
【The invention's effect】
As is apparent from the above description, according to the present invention, since the conductor paste mainly composed of Al, which is the same metal as the Al wiring layer, is filled in the through hole, the wiring layer is well-familiar with the wiring layer. And the anode conductor can be reliably conducted.
[0061]
Al, which is the main component of the conductor paste, uses Al fine powder with an average particle size of 1 to 10 μm, so the oxide film on the surface of the Al particles and the oxide film on the Al wiring layer are destroyed by the oxidation reaction, and good conduction is achieved. Sex can be obtained. Further, since this reaction does not proceed excessively even if firing at 550 to 600 ° C. is repeated, the conduction between the Al wiring layer and the anode conductor can be maintained.
[0062]
Furthermore, since the conductive paste containing A as a main component can provide stable resistance at a lower cost than the conductive paste containing Ag as a main component, a fluorescent display tube that is less expensive than the conventional one can be provided.
[Brief description of the drawings]
FIG. 1 is a partially cut perspective view of a fluorescent display tube with a three-dimensional grid. FIG. 2 is a partial sectional view of the fluorescent display tube with a three-dimensional grid in FIG. 1. FIG. Partial enlarged sectional view of the fluorescent display tube of FIG.
DESCRIPTION OF SYMBOLS 1 ... Fluorescent display tube, 7 ... Wiring layer, 9 ... Insulating layer, 12 ... Conductor layer, 13 ... Anode conductor, 14 ... Phosphor layer, 21 ... Fluorescent display tube with a three-dimensional grid

Claims (7)

An Al wiring layer formed on the inner surface of the anode substrate;
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A paste containing at least one of an organic metal or a low softening point glass frit with a softening point temperature of 300 to 400 ° C. in an Al powder having an average particle diameter of 1 to 10 μm is filled in the through hole, and is 550 ° C. to 600 ° C. A conductor layer formed by firing ;
An anode conductor formed so as to connect the Al wiring layer electrically to conductor layer,
A fluorescent display tube comprising a phosphor layer formed on the anode conductor. An Al wiring layer formed on the inner surface of the anode substrate;
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A paste in which an Al powder having an average particle diameter of 1 to 10 μm and a low softening point glass frit having a softening point temperature of 300 to 400 ° C. and a vehicle is mixed is filled in the through hole and fired at 550 ° C. to 600 ° C. A conductor layer comprising:
An anode conductor formed so as to connect the Al wiring layer electrically to conductor layer,
A fluorescent display tube comprising a phosphor layer formed on the anode conductor. The conductor layer is composed of an Al powder 40 to 80%, a low melting point glass frit 3 to 40% having a softening point temperature of 300 to 400 ° C., and a conductor paste mixed at a ratio of 15 to 30% at 550 to 600 ° C. The fluorescent display tube according to claim 2, which is fired . An Al wiring layer formed on the inner surface of the anode substrate;
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A conductor layer in which a paste in which an organic Ti compound and a vehicle are mixed with Al powder having an average particle diameter of 1 to 10 μm is filled in the through hole and fired at 550 ° C. to 600 ° C . ;
An anode conductor formed on the conductor layer so as to be electrically connected to the Al wiring device ;
A fluorescent display tube comprising a phosphor layer formed on the anode conductor. The conductor layer is obtained by firing a conductor paste mixed at a ratio of 60 to 80% Al powder having an average particle size of 1 to 10 μm , 3 to 25% of an organic Ti compound, and 15 to 25% of a vehicle at 550 to 600 ° C. fluorescent display according to claim 4, comprising Te. An Al wiring layer formed on the inner surface of the anode substrate;
An insulating layer in which through holes are formed at important points on the Al wiring layer;
A paste in which an Al powder having an average particle diameter of 1 to 10 μm and a low softening point glass frit having a softening point temperature of 300 to 400 ° C., an organic Ti compound, and a vehicle is filled in the through hole is filled into the through holes. A conductor layer fired at ℃ ,
An anode conductor formed on the conductor layer so as to be electrically connected to the Al wiring device ;
A fluorescent display tube comprising a phosphor layer formed on the anode conductor. The conductor layer is composed of 40 to 80% Al powder having an average particle size of 1 to 10 μm , 3 to 40% low melting point glass frit having a softening point temperature of 300 to 400 ° C., 3 to 25% organic Ti compound, and 15 to 25 vehicles. The fluorescent display tube according to claim 6, wherein the conductive paste mixed at a ratio of% is fired at 550 ° C. to 600 ° C. 7.

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