JPH11277863A - Screen printing body, screen printing method and plasma display substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a screen printing body formed with a specified pattern in which blur is suppressed by setting blur of pattern at a specified level or below thereby performing stabilized printing while touching the protrusion on a screen plate to a substrate. SOLUTION: The plate making frame of a screen plate 5 is squeeged while being pressed against a frame 6 by a roller interlocked with a squeegee 4 and the screen plate 5 touches a substrate 1 directly under the squeegee 4. In front and rear thereof, they are kept in separated state and printing is performed while keeping a constant contact angle between the screen plate 5 and the substrate 1. Consequently, blur can be suppressed to 10 μm or less for the address electrode 13 of substrate for plasma display formed by screen printing and dimensional difference of pattern can be confined within 30 ppm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing body and a screen printing method, and more particularly, to a screen printing body capable of obtaining a high-definition and large-area printing pattern using a large-area screen plate. The present invention relates to a plasma display device substrate used.

[0002]

2. Description of the Related Art Generally, when forming electric circuit wiring, electrodes, heating elements, etc. on an insulating substrate such as ceramics or glass, a conductive paste such as a metal is formed in a predetermined pattern using a screen printing method. Has been done.

In the conventional screen printing method, as shown in FIG. 4, a screen printing plate 2 arranged in parallel with a predetermined space with respect to a printing surface of a substrate 1, and a printing paste 3 via the screen printing plate 2 Is formed of a rubber squeegee 4 for imprinting on the substrate 1.

[0004] With this configuration, for example, when an electric circuit wiring is formed by printing, the screen plate 2 on which the wiring pattern is formed is arranged at a predetermined distance from the substrate 1 in the printing apparatus. Then, the printing paste 3 is placed on the screen plate 2 and the squeegee 4 is moved in the direction of the arrow while pressing the substrate 1 toward the substrate 1, and the printing paste 3 is printed on the pattern opening of the screen plate 2. A wiring circuit pattern is formed.

[0005] In recent years, a plasma display device using plasma emission (plasma display panel: hereinafter referred to as PDP) has attracted attention as a light emitting element of a large-screen color image display device as a flat image display device. I have.

This PDP is, as shown in FIG.
1 and a pair of flat insulating substrates forming a front plate 16 and minute discharge display cells 15 surrounded by partition walls 12 that partition the space.
And a pair of discharge electrodes 17, and at the bottom thereof, address electrodes 13 which generate plasma by discharge between the discharge electrodes 17 and perform light emission switching of the discharge display cells 15.
And a space in which a dischargeable gas such as a rare gas is hermetically sealed into the space.
A voltage is selectively applied between the discharge electrode 3 and the discharge electrode 17 to generate a plasma by the discharge, and the phosphor 14 formed on the inner wall of the discharge display cell 15 by the ultraviolet light emitted from the plasma.
To emit light and use it as a light emitting element of an image display device.

In this PDP, the back plate 11
When the partition wall 12 and the address electrode 13 are formed thereon to manufacture a PDP substrate, the address electrode 13 is formed by using the above-described screen printing method.

[0008]

However, in the above-mentioned screen printing method, in the case of a high-precision print pattern with a narrow wiring width, the printed print pattern is blurred, and the pattern contour is not sharpened. There are problems such as the inability to obtain the desired print pattern and the poor dimensional accuracy of the print pattern for the screen plate 2.

For this purpose, a printing method with less bleeding has been devised. As a method of obtaining a print pattern with less bleeding, a method is used in which the gap between the screen plate 2 and the substrate 1 is minimized and printing is performed in a state where the screen plate 2 and the substrate 1 are in close contact with each other.

For example, according to Japanese Patent Application Laid-Open No. Hei 8-90752, a screen plate is brought into close contact with a substrate by a roller-shaped screen pressing mechanism disposed before and after a squeegee.
In JP-A-8-34110, the screen plate and the substrate are brought into close contact with each other over the entire printing surface.

As described above, the improvement of the accuracy of the print pattern can be achieved by a method of eliminating the gap between the screen plate and the print target. However, in this case, there is a problem of separation of the screen plate. In other words, the printing pattern is blurred due to the fluidity of the printing paste, and the adhesion area is increased, so that the separation of the printing plate is deteriorated.

Japanese Patent Application Laid-Open No. Hei 8-90752 proposes a technique for obtaining a constant plate separation angle by using a roller-shaped screen pressing mechanism. Has proposed a mechanism for peeling a plate from a substrate at a plate separation angle. However, due to this plate separation mechanism, a very high tension is applied to the screen plate making, and the plate making elongation becomes large, which causes a reduction in the dimensional accuracy of the print pattern and a decrease in the printing life of the screen plate. Was.

For the above reasons, it is inevitable that the bleeding amount D of about 30 μm is generated also in the address electrode 13 on the PDP substrate as shown in FIG. Therefore, it is difficult to form an address electrode 13 having a high-definition electrode pattern with little bleeding under a large area, and there is a problem that it is not possible to cope with an increase in the area and definition of a PDP.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a printing pattern with less bleeding and at the same time, to greatly reduce the load of elongation applied to a screen plate during printing. It is another object of the present invention to provide a screen printing method capable of greatly extending the life of a screen plate.

[0015]

Means for Solving the Problems The present inventors have made intensive studies in view of the above problems, and as a result, have made a screen plate into a curved shape so that the substrate side is convex, and perform printing while making the convex portion contact the substrate. This enables stable printing,
It has been found that the occurrence of printing bleeding can be suppressed.

The present invention is characterized in that, in a screen print obtained by printing a paste on a substrate by using a screen plate to form a predetermined pattern, the amount of bleeding of the pattern is 10 μm or less. Further, the dimensional difference between the size of the pattern formed on the substrate and the size of the pattern on the screen plate is within 30 ppm.

That is, in the ordinary screen printing method, a bleeding amount of about 30 μm cannot be avoided as described above, but according to the screen printing method of the present invention described later, the bleeding amount is 10 μm or less for the first time. A screen print having a dimensional accuracy of 30 ppm or less can be obtained.

According to the present invention, there is provided a screen printing method in which a paste is printed on a substrate by using a screen plate to form a predetermined pattern, wherein the screen plate is curved so as to be convex toward the substrate. In addition, the screen plate and the substrate are brought into contact with each other at the printing portion, and screen printing is performed in a state where the two are separated before and after.

Further, according to the present invention, an address electrode is formed by the above screen printing method on a substrate for a plasma display device comprising a plurality of partition walls on a back plate and a plurality of address electrodes arranged between the partition walls. Thus, the amount of bleeding of the address electrode is reduced to 10 μm or less.

[0020]

According to the screen printing method of the present invention, a curved screen plate is used, the convex side is brought into contact with the substrate, the printing paste is placed on the concave side, and squeezing is performed. The gap between the substrate and the substrate can be set to almost 0. Further, the screen plate and the substrate are separated before and after the squeegee, and the contact angle between the two is kept constant by the curvature of the screen plate, so that the printing does not always bleed stably. A highly accurate print pattern can be formed.

Moreover, the stress applied to the screen plate during printing is only the pressure for applying the printing paste of the squeegee, and since the screen plate and the substrate are in close contact, the screen plate cannot extend in principle. . As a result, unnecessary tension is not applied to the screen plate making. As a result, there is no deterioration in print pattern accuracy due to the elongation of the screen plate making, and the life of the screen plate making itself is greatly extended.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1A is a conceptual view showing an apparatus used in the screen printing method of the present invention. The screen printing plate 5 is curved so that the printing side of the substrate 1 is convex, and the screen printing plate 5 is interposed through the screen printing plate 5. Printing paste 3 on substrate 1
And a rubber squeegee 4 for imprinting.

Then, the convex portion of the curved screen plate 5 is brought into contact with the substrate 1, the printing paste 3 is placed on the concave side of the curved screen plate 5, and the squeegee 4 is moved in the direction of the arrow to perform printing.

FIG. 1B shows a more detailed structure of the screen printing apparatus. As shown in FIG. 1B, a plate making frame 5a of a curved screen plate making 5 is provided by a roller 7 provided on a squeegee head 8 so as to interlock with the squeegee 4. It is pressed against the frame 6, moves in the direction of the arrow in this state, and performs squeezing.

FIG. 2 shows a detailed screen printing procedure.
It is explained based on.

First, the substrate 1 is placed on the table 10,
The frame 6 is disposed around the frame. As shown in FIG. 2A, the alignment between the substrate 1 and the print pattern is performed using the end portion of the curved screen plate 5. At this time, both sides of the prepress are fixed by guides 9 and the printing apparatus has a mechanism that does not cause pattern shift due to printing.

Next, as shown in FIG. 2 (b), the plate making frame 5a of the screen plate making 5 is squeezed while being pressed by the frame 6 by the roller 7 interlocking with the squeegee 4, and the screen plate making is made immediately below the squeegee 4. 5 and substrate 1
Contact, and before and after both keep a separated state,
Printing is performed while the contact angle θ between the screen plate 5 and the substrate 1 is kept constant. Also, at this time, screen plate 5
Is always in contact with the substrate 1, and there is no need to apply unnecessary tension.

Then, as shown in FIG.
By performing printing up to the end, a screen print can be obtained.

According to such a screen printing method, since the screen plate 5 and the substrate 1 are in contact with each other immediately below the squeegee 4, high-precision printing can be performed. Since the substrate 1 is separated, it is possible to prevent the occurrence of bleeding or the like when the plate is separated.

As a result, the address electrodes 13 of the PDP substrate formed by the screen printing method of the present invention are connected to each other as shown in FIG.
As shown in the figure, the amount of bleeding D is reduced to 10 μm or less,
In addition, the difference between the pattern dimension of the screen plate 5 and the dimension of the obtained pattern can be formed with extremely high accuracy of 30 ppm or less.

The bleeding amount D is, as shown in FIG. 3, the maximum value of fine irregularities in the linear portion of the obtained pattern. The smaller the bleeding amount is, the higher the definition of the pattern becomes. Can be formed. In particular, in the case of a PDP substrate, by setting the bleeding amount D of the address electrode 13 to 10 μm or less, a higher definition P
DP can be supported.

The degree of curvature of the screen plate 5 is determined by the substrate 1 and the screen plate 5 shown in FIG.
May be set to be in the range of 1 to 15 °. This is because if the contact angle θ is less than 1 °, the effect of reducing the amount of bleeding is small, and if it exceeds 15 °, it becomes difficult to make a plate.

The screen printing method of the present invention is preferably used particularly for a PDP substrate. In addition, a thick film circuit substrate printing, a green sheet circuit pattern printing for a laminated package, a glaze pattern printing for a thermal head, etc.
It can be used for various printing processes such as heating pattern printing of a ceramic heater.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below by taking as an example a case where address electrodes 13 of a PDP substrate are formed on a back plate 11 made of glass.

First, a PDP address electrode pattern of 900 × 600 mm was provided on a stainless mesh having a wire diameter of 28 μm and 325 mesh, and a contact angle θ with the substrate 1 was 1 mm.
The screen plate 5 was prepared so as to be curved to the degree.

Next, a back plate 11 was formed from soda lime glass having a thickness of 2 mm and a size of 42 inches. As shown in FIG.
, The printing paste 3 is placed immediately before the squeegee 4 on the screen plate 5 and the squeegee 4 is moved to 900.
A plurality of linear patterns having a line width of 80 μm were formed in an area of mm × 600 mm to form address electrodes 13.

As shown in FIG. 2, the screen making plate 5 is mounted on a frame 6 for fixing the plate making frame 5a, and the plate making frame 5a is surrounded by a roller 7 made of urethane rubber. In a pressed state, the roller 7 is fixed to the squeegee head 8 so as to interlock with the squeegee 4.

For comparison, printing was performed by a general screen printing method using a conventional screen plate having the same PDP address electrode pattern as described above.

Table 1 shows the measurement results of the bleeding amount and the dimensional difference between the pattern of the screen plate 5 and the obtained address electrode 13. From these results, in the screen printing method of the present invention, it is possible to obtain a good printing pattern in which the amount of bleeding is smaller than that of the conventional printing method by 10 μm and the dimensional difference from the pattern formed on the screen plate is as small as 30 ppm. Was completed.

[0041]

[Table 1]

[0042]

According to the screen printing method of the present invention,
It is possible to form a high-definition print pattern with little bleeding, and a large tension is not applied to the screen plate making. As a result, the life of the screen plate making can be greatly improved.

As a result, a high-precision pattern having a bleeding amount of 10 μm or less and a dimensional accuracy with respect to screen plate making of 30 ppm or less can be obtained. It is possible to obtain a fine PDP.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing an apparatus used for a screen printing method of the present invention.

FIGS. 2A to 2C are schematic views showing a screen printing method of the present invention.

3A is a schematic view of a pattern formed by a conventional screen printing method, and FIG. 3B is a schematic view of a pattern formed by a screen printing method of the present invention.

FIG. 4 is a diagram showing an apparatus used for a conventional screen printing method.

FIG. 5 is a cross-sectional view illustrating a general plasma display device.

[Description of Signs] 1: Substrate 3: Print paste 4: Squeegee 5: Screen plate making 6: Frame 7: Roller 8: Squeegee head 9: Guide 10: Table

Continued on the front page (72) Inventor Masaaki Toya 1166-6, Haseno, Hanazo-cho, Yokaichi-shi, Shiga Prefecture Inside the Shiga Plant of Kyocera Corporation (72) Inventor Shoichi Kakita 6-166, 1166 Haseno, Hanazo-cho, Yokaichi-shi, Shiga Prefecture Shiga Factory

Claims (4)

[Claims] 1. A screen printed body formed by printing a paste on a substrate using a screen plate to form a predetermined pattern, wherein the pattern has a bleed amount of 10 μm or less. . 2. The method according to claim 1, wherein the dimension difference between the dimension of the pattern formed on the substrate and the dimension of the pattern on the screen plate is 3.
The screen print according to claim 1, wherein the content is within 0 ppm. 3. A screen printing method for printing a paste on a substrate using a screen plate to form a predetermined pattern, wherein a screen plate curved so that the substrate side is convex is used, and a screen is formed at a printing portion. A screen printing method, wherein a plate making and a substrate are brought into contact with each other, and screen printing is performed in a state where both are separated before and after. 4. In a plasma display device substrate comprising a plurality of partition walls on a back plate and a plurality of address electrodes arranged between the partition walls, the bleeding amount of the address electrodes is 10 or less.
A substrate for a plasma display device, which is not more than μm.