JPH06191009A - Jig for paste printing - Google Patents

Abstract

PURPOSE:To prevent the contamination of the rear surface of a molded body and falling from a jig when paste is printed on the ceramic molded body. CONSTITUTION:Fixing parts 33 for fixing a calcinated body on the upper surface of a flat plate 31 are provided. Back facing parts 34 are provided at the bottom surfaces of the fixing parts 33. Sucking holes 35 are provided at the bottom surfaces of the back facing parts 34. Supporting parts 36, which support the region other than the region, wherein through holes are penetrated in the calcinated body, are provided at the back facing parts 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste printing jig, which is used as a means for fixing a calcined body when printing a conductive metal paste on a ceramic molded body (particularly, calcined body). It relates to a jig installed on the table of a machine.

[0002]

2. Description of the Related Art Conventionally, a ceramic substrate provided with a through hole (hereinafter abbreviated as TH) is printed with a conductive metal paste on a molded body formed by molding a slurry containing ceramic powder, degreasing, calcination, and baking. It is obtained by firing. This type of ceramic substrate has been particularly expected in recent years as a substrate for mounting an IC chip or the like, which tends to be faster and smaller.
In order to meet such expectations, it is said that forming a fine TH on a ceramic substrate with high precision is an essential issue.

By the way, in general, when a paste is printed on an unsintered ceramic compact having a fine TH diameter and a fine pitch, the TH forming holes may be deformed or misaligned, or filling defects may occur. The problem of occurs. As a method capable of solving this kind of problem, the present inventor proposes in the previously filed application (Japanese Patent Application No. 4-225687, etc.) that the ceramic compact is degreased and pre-fired before the paste filling. is doing.

FIG. 13 illustrates a screen printer 40 used at that time. On the table 40a of the printing machine 40, as shown in FIG. 15, a jig 43 having a fixing portion 42 that is substantially the same as the outer shape of the calcined body 41 is attached. Then, the paste P printing on the calcined body 41 is
This is performed by mounting the calcined body 41 on the fixed portion 42 and moving the squeegee 46 in a predetermined direction with the mask 45 closely arranged on the surface of the calcined body 41.

[0005]

However, the jig 4 described above is used.
With the shape of the fixed portion 42 of No. 3, the entire back surface of the calcined body 41 comes into contact with the bottom surface of the fixed portion 42.
42 has almost no space. In other words, the bottom surface of the fixing portion 42 substantially closes the lower opening of the TH forming hole 44. When the paste P is filled in such a state, the paste P or the solvent extruded from the lower opening of each TH forming hole 44 spreads around the opening and the entire back surface is soiled, or the calcined body 41 is moved to the jig. It becomes difficult to come off by attaching to 43. Therefore, it is necessary to remove dirt in the subsequent process.

Further, since the printing paste P is usually of high viscosity, the calcined body 41 follows the mask 45 when the mask 45 is peeled off, and the calcined body 41 is inadvertently cured. It may come off from the tool 43 (see FIG. 14).

The present invention has been made in view of the above circumstances, and an object thereof is to ensure that the back surface of the calcined body is not contaminated and is unintentionally detached from the jig when the paste is printed on the calcined body. Another object of the present invention is to provide a paste printing jig that can prevent such problems.

[0008]

In order to solve the above problems, in the present invention, a concave portion (hereinafter referred to as "fixing portion") for fitting a calcined body is provided on the upper surface of a flat plate,
A recess (hereinafter referred to as a "counterbore part") is further provided on the bottom surface of the fixed part so that a space is formed between the calcined part and the fixed part when the calcined part is fitted. Is characterized by. In this case, a suction hole may be provided on the inner surface of the counterbore.

Further, in the calcined body, a part of the bottom face of the counterbore part is approximately the same as the bottom face of the recess so that it can contact and support the region other than the region where the TH forming hole is provided through. You may provide the convex part (henceforth a "support part") of height.

[0010]

With this jig construction, when the calcined body is fitted, only the outer edge of the back surface comes into contact with the bottom surface of the fixed portion, and the portion other than the outer edge of the back surface, that is, the TH forming hole is transparently provided. The area is not in contact with the bottom surface of the fixed portion. Therefore, each TH
The lower opening of the forming hole is in an open state. For this reason, the paste or solvent extruded from the lower opening easily escapes to the lower side of the calcined body, and dirt is less likely to adhere to the back surface of the calcined body.

When the mask is peeled off after printing,
By sucking air from the suction holes provided in the countersunk portion to keep the inside of the countersunk portion at a negative pressure, the calcined body can be prevented from coming off easily.

Further, if a support portion for supporting the calcined body from below is provided in the counterbore portion, the bending of the central portion of the calcined body due to the application of printing pressure is prevented, and uneven filling of the paste is eliminated. In addition, even if the scale of the calcined body is increased, cracks and breaks in the calcined body are prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments embodying the present invention will be described in detail below with reference to FIGS. [Embodiment 1] The jig of Embodiment 1 is for printing a paste P made of tungsten or the like on a calcined body G1 as shown in FIG. 1 (a). In addition, this calcined body G
1 is obtained by degreasing and pre-baking an AlN green sheet according to a conventionally known method. Also, FIG.
As shown in (a), a large number of TH forming holes 2 are formed in a staggered manner in a portion other than the outer edge portion of the calcined body G1.
More specifically, the calcined body G1 has four regions R1 in which the TH forming holes 2 are provided, and a cross-shaped region in which the TH forming holes 2 are not provided between the regions R1. There is. The region R1 in which the TH forming hole 2 is provided here means TH.
It is a portion where the forming holes 2 are densely formed.

As shown in FIG. 2, the paste printing jig of Example 1 has a substantially square outer shape (300 mm square, 1 mm thick).
0 mm). As the forming material, for example, a flat plate made of synthetic resin such as Bakelite or a flat plate made of stainless steel is used. A bolt hole H for attaching the jig to the table T1 of the screen printing machine M1 is provided on the outer peripheral portion of the flat plate 1 forming the jig. In the central portion of the flat plate 1, a total of eight substantially square fixing portions 3 are arranged in two rows along the moving direction of the roller squeegee S.

As shown in FIGS. 1 (b) and 1 (c),
A substantially square counterbore 4 is provided on the bottom surface of each fixing portion 3. Therefore, as shown in FIG.
The step portion 3b as shown in (c) is formed. Each of the four corners of the fixed portion 3 and the countersunk portion 4 has a relief hole 3
a and 4a are formed. Relief hole 3a of fixing part 3
Is for preventing the corner portion from being hooked when the calcined body G1 is attached or detached. Relief hole 4 in the spot facing part 4
The a is provided at a position corresponding to the TH forming hole 2a for positioning formed in the calcined body G1.

In the jig of Example 1, the depth of the fixing portion 3 is set to be smaller than the thickness of the calcined body G1. Further, the spot facing portion 4 is set to be larger than the area of four regions R1 in which the TH forming holes 2 are formed.

Next, the procedure for printing the paste P will be described with reference to FIG. The jig is mounted on the table T1 of the screen printing machine M1 by bolts as shown in FIG. At that time, a calcined body G1 is mounted on each fixing portion 3, and a mask m1 having a paste supply port m1a is closely arranged thereon. At this time, the outer edge of the calcined body G1 is supported from below by the stepped portion 3b.

Then, when the roller squeegee S is moved while supplying the paste P to the advancing direction side of the squeegee S,
The paste P is supplied through the paste supply port m1a, and T
The paste P is filled in the H forming hole 2.

According to the structure of this jig provided with the counterbore portion 4, when the calcined body G1 is attached to the fixed portion 3, the area R1 in which the TH forming hole 2 in the calcined body G1 is transparently provided. The lower side is free. For this reason, the paste P and the solvent extruded to the lower opening of each TH forming hole 2 by the printing easily fall out below the calcined body G1 without spreading around the lower opening. Therefore, the degree of dirt adhering to the back surface of the calcined body G1 is smaller than in the conventional case, and the dirt removing work in the subsequent process is unnecessary or extremely easy. [Embodiment 2] Next, the construction of a jig of Embodiment 2 will be described with reference to FIGS.

The jig of the second embodiment is also for printing the paste P on the calcined body G1, and the flat plate 1 is the same as the jig of the first embodiment.
1 has a structure in which a total of eight fixing portions 3 are arranged in two rows (see FIG. 5). The features of this jig are shown in FIG.
As shown in (a) and FIG. 4 (b), one suction hole 15 having a circular cross section is provided at substantially the center of each countersunk portion 4.

Next, the procedure for printing the paste P using this jig will be described with reference to FIG. The jig is mounted on the table T2 of the screen printing machine M2 by bolts as shown in FIG. The table T2 of the printing machine M2 has an air discharge passage A1 connected to a blower (not shown).

When printing is performed, each fixed portion 3 has a calcined body G.
1 is mounted, and a mask m1 having a paste supply port m1a is closely arranged thereon. At this time, the air pipe passage A1 and the spot facing portion 4 are in communication with each other through the suction hole 15. Then, the filling of the paste P into the TH forming holes 2 is performed by moving the squeegee S as in the first embodiment.

When the mask m1 is peeled off from the calcined body G1 after printing, the air in the spot facing portion 4 is reduced by a blower to 0.
Aspirate for 2 to 0.5 seconds. Therefore, the mask m1
While being separated from the surface of the calcined body G1, the air pressure in the spot facing portion 4 is maintained at a negative pressure of about 300 mmAq to 600 mmAq, and the calcined body G1 is attracted downward. Therefore, the calcined body G1
Is reliably fixed, and it becomes difficult for the fixed part 3 to come off.

Further, according to the present jig having the countersunk portion 4, as in the case of the jig of the first embodiment, there is an advantage that the degree of contamination of the back surface of the calcined body G1 by the paste P or the like becomes slight. . [Embodiment 3] Next, the construction of a jig of Embodiment 3 will be described with reference to FIGS.

The jig of the third embodiment is for printing the paste P on the calcined body G2 as shown in FIG. 7 (a). A feature of the calcined body G2 is that it has an IC chip mounting portion G2a at the center as shown in FIG. Therefore, in the calcined body G2, a large number of TH forming holes 2 are provided in the region R1 other than the outer edge portion and the IC chip mounting portion G2a.

As shown in FIG. 8, a total of three substantially square fixing portions 23 are arranged in a line along the moving direction of the roller squeegee S in the central portion of the flat plate 21. Also,
As shown in FIGS. 7 (b) and 7 (c), a substantially square counterbore portion 24 is provided on the bottom surface of each fixing portion 23,
The inner wall surface of the fixed portion 23 has a step portion 2 as shown in FIG.
3b is formed. Further, at the four corners of the fixing portion 23 and the four corners of the countersunk portion 24, the escape holes 23a and 24 are provided.
a is formed.

At the center of the countersunk portion 24, a support portion 26 having a shape having rounded corners is provided. The upper surface of the support portion 26 is at the same height as the bottom surface of the fixed portion 23,
The size of the surface is slightly smaller than the size of the IC chip mounting portion G2a. Further, four suction holes 25 each having a circular cross section are provided on the bottom surface of each countersunk portion 24 so as to surround the support portion 26.

The printing of the paste P is carried out with a jig attached on a table T2 having an air discharge path A1 as shown in FIG. 9 and a calcined body G2 and a mask m1 set at predetermined positions. Further, when the mask m1 is peeled off from the calcined body G1 after printing, the air in the spot facing portion 24 is sucked by the blower as in the second embodiment.

Now, according to the structure of this jig, as described in detail in Embodiments 1 and 2, the back surface is prevented from being soiled and the calcined body G is formed.
In addition to the prevention of disconnection, there are the following advantages.

That is, the calcined body G is attached to the fixing portion 23 of the jig.
When 2 is mounted, the calcined body G2 is supported from below by both the step portion 23b and the support portion 26. For this reason, bending of the calcined body G2 (particularly the central portion) during printing of the paste P is reliably prevented. Therefore, all TH
There is an advantage that the paste P can be uniformly filled in the forming holes 2. Further, since it is possible to prevent the calcined body G2 from being damaged due to the bending, it is possible to perform the paste P printing with a higher printing pressure setting than before. Therefore, by using the jig of Example 3, printing on a large calcinated body for collecting a large number of
It can be seen that this is particularly advantageous when printing on a large calcinated body having fine TH forming holes 2.

Furthermore, in this jig, since four suction holes 25 are provided for one fixed portion 23, there is no difference in suction force depending on the position. Therefore, a reliable calcined body G
Detachment prevention of 1 is achieved. [Embodiment 4] Next, the construction of a jig of Embodiment 4 will be described with reference to FIGS.

The jig of Example 4 is for printing the paste P on the calcined body G2 as shown in FIG. 10 (a). The calcined body G3 has nine regions R1 in which the TH forming holes 2 are provided, and a substantially # -shaped region G3a in which the TH forming holes 2 are not provided is provided between the regions R1. is there. The calcined body G3 is also provided with a TH forming hole 2b for front and back recognition.

As shown in FIG. 11, in the central portion of the flat plate 31, a total of three substantially square fixing portions 33 are arranged in a line along the moving direction of the roller squeegee S as in the third embodiment. ing.

As shown in FIGS. 10 (b) and 10 (c), a substantially square counterbore 34 is provided on the bottom surface of each fixing portion 33, and the inner wall surface of the fixing portion 33 is provided with a drawing. 10
A step portion 33b as shown in (c) is formed. Further, escape holes 33a and 34a are formed in the four corners of the fixed portion 33 and the countersunk portion 34, respectively. Further, the countersink portion 34 has a TH forming hole 2b for front and back recognition.
An escape hole 34b is also provided at a position corresponding to.

As shown in FIG. 10 (b), a total of twelve elongated bearing portions 36 are provided on the bottom surface of each countersunk portion 34 so as to project therefrom. The upper edge of each bearing 36 is the fixed portion 3
It is at the same height as the bottom surface of 3. The width of the upper edge of the support portion 36 is narrower than the width between the regions R1 and the calcined body G3.
At the time of mounting, the upper edge of the support portion 36 abuts only on the substantially # -shaped region G3a in which the TH forming hole 2 is not provided.

As shown in FIG. 10B, the counterbore portion 34
The bottom surface of the bearing is divided into a total of nine small portions by the bearings 36. Suction holes 35 each having a circular cross section are provided in each of the sections thus divided.

When the paste P is printed by using this jig, the calcined body G2 mounted on the fixing portion 33 has the step portion 33.
It is supported from below by both b and the support portion 36. Therefore, as in the third embodiment, the calcined body G3 is surely prevented from bending during printing the paste P, and the total TH
Reliable filling of the forming holes 2 with the paste P is realized. Moreover, according to the structure of this jig, since the back surface of the calcined body G2 is supported as a whole, the bending can be prevented more reliably. Therefore, it is advantageous when the paste P printing is performed on a larger calcined body. It is needless to say that the jig 31 is provided with the function of preventing the stain on the back surface and the function of preventing the calcined body G3 from coming off, in addition to the advantages described above.

The present invention is not limited to the constitutions of the above-mentioned first to fourth embodiments, but can be changed to the constitutions below. For example, (a) the number of fixed portions 3, 23, 33 or the arrangement method thereof may be changed, or the number and positions of the suction holes 15, 25, 35 provided in the spot facing portions 4, 24, 34 may be changed. .

(B) Suction hole 1 as in Examples 2-4
Instead of providing 5,25,35 on the bottom surface of the countersunk portions 4,24,34, they may be provided on the side surfaces of the countersunk portions 4,24,34.

(C) Instead of providing the suction holes 15, 25, 35 in the counterbore parts 4, 24, 34, the counterbore part 4,
The entire bottom surfaces of 24 and 34 may have a mesh structure or the like.

[0041]

As described in detail above, according to the configuration of the paste printing jig of the present invention, even when the paste is printed on the calcined body, stains on the back surface of the calcined body are not removed from the jig. It has an excellent effect that it is possible to reliably prevent both the prepared disengagement.

[Brief description of drawings]

1A is a plan view showing a calcined body, FIG. 1B is a partial plan view showing a fixing portion in a paste printing jig of Example 1, and FIG. 1C is a line AA of FIG. 1B. FIG.

2 is a plan view showing a paste printing jig of Example 1. FIG.

FIG. 3 is a partial schematic front cross-sectional view showing a usage state of the paste printing jig shown in FIG.

FIG. 4A is a partial plan view showing a fixing portion of the paste printing jig of Example 2, and FIG. 4B is a sectional view taken along line BB in FIG. 4A.

5 is a plan view showing a paste printing jig of Example 2. FIG.

6 is a partial schematic front cross-sectional view showing a usage state of the paste printing jig of FIG.

7A is a plan view showing a calcined body, FIG. 7B is a partial plan view showing a fixing portion in the paste printing jig of Example 3, and FIG. 7C is a CC line of FIG. 7B. FIG.

8 is a plan view showing a paste printing jig of Example 3. FIG.

9 is a partial schematic front sectional view showing a usage state of the paste printing jig shown in FIG. 8;

10A is a plan view showing a calcined body, FIG. 10B is a partial plan view showing a fixing portion in the paste printing jig of Example 4, and FIG. 10C is a DD line of FIG. FIG.

FIG. 11 is a plan view showing a paste printing jig of Example 4.

12 is a partial schematic front cross-sectional view showing a usage state of the paste printing jig shown in FIG. 11. FIG.

FIG. 13 is a partial schematic front sectional view showing a usage state of a conventional paste printing jig.

FIG. 14 is a partial schematic cross-sectional view showing a state in which the mask has been peeled off from the calcined body after printing the paste.

FIG. 15 is a plan view showing a state where a calcined body is mounted on a conventional paste printing jig.

[Explanation of symbols]

G1, G2, G3 ... Ceramic molded body (= calcined body),
1, 11, 21, 31 ... Flat plate, 3, 23, 33 ... Recessed portion (= fixed portion), 4, 24, 34 ... Recessed portion (= counterbore portion),
15, 25, 35 ... suction holes, 26, 36 ... convex portions (= supporting portions).

Claims (3)

[Claims] 1. An upper surface of a flat plate (1, 11, 21, 31),
Recesses (3, 23, 33) for fitting the ceramic molded bodies (G1, G2, G3) are provided, and the ceramic molded bodies when the ceramic molded bodies (G1, G2, G3) are fitted. Further recesses (4, 24, 34) are formed on the bottom surface of the recesses (3, 23, 33) so that a space is formed between (G1, G2, G3) and the recesses (3, 23, 33). A jig for paste printing characterized by being provided. 2. The paste printing jig according to claim 1, wherein suction holes (15, 25, 35) are provided on the inner surfaces of the depressions (4, 24, 34). 3. A convex portion (26, 36) having substantially the same height as the bottom surface of the concave portion (3, 23, 33) is provided on a part of the bottom surface of the depression (4, 24, 34). The paste printing jig according to claim 1 or 2.