JPH0710277A - Method for laminating ceramic green sheet - Google Patents

Abstract

PURPOSE:To easily position a carrier-film-equipped ceramic green sheet. CONSTITUTION:A carrier-film-equipped ceramic green sheet is conveyed onto the positioning block 30 of a manipulator. An attracting head 22 takes the carrier-film-equipped ceramic green sheet (a) out of a magazine and conveys the sheet onto the positioning block 30 and the positioning holes (d) of the sheet are fitted over positioning pins 31 to position the sheet; the four positioning holes (d) are not simultaneously adjusted to the positioning pins 31, but first two or three of the holes are adjusted to and fitted over the corresponding positioning pins 31. The other one or two positioning holes (d) are therefore automatically adjusted to and can be fitted over the positioning pins 31. The carrier-film-equipped ceramic green sheet (a) is thus disposed in position on the positioning block 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laminating ceramic green sheets in manufacturing a monolithic ceramic electronic component such as a monolithic ceramic capacitor or a monolithic ceramic inductor.

[0002]

2. Description of the Related Art In a monolithic ceramic capacitor, which is the most typical example of monolithic ceramic electronic components, a large number of dielectric ceramic layers having internal electrodes are stacked, and the internal electrodes are alternately drawn out to the end faces of the laminated body. Then, external electrodes are formed on the end faces of the stacked body from which these internal electrodes are drawn out.

Such a monolithic ceramic capacitor is
For example, it has a layer structure as shown in FIG. That is,
The dielectric layers 63, 63, ... Having the internal electrodes 65, 66 are laminated in the order shown in FIG. 8, and a plurality of dielectric layers 67, 68 without the internal electrodes are further laminated on both sides thereof. Then, the internal electrodes 65, 66 of such a laminated body are
External electrodes (not shown) are formed on the exposed end faces.

Such a monolithic ceramic electronic component is not normally manufactured individually as a unit as shown in FIG. 8, but the following manufacturing method is actually used. That is, first, finely pulverized ceramic powder and an organic binder are kneaded to form a slurry, which is thinly spread on a long tape-shaped carrier film by a doctor blade method and dried to form a long ceramic green sheet. create. Next, a conductive paste is printed on the ceramic green sheet placed on the carrier film by a screen printing method and dried, and internal electrode patterns 2a and 2b as shown in FIG. 7 are alternately printed. The printed double-layered tape is once wound into a roll.
Then, this two-layer tape roll is set as a supply roll in a cutting and laminating apparatus, the two-layer tape is unwound from this supply roll, and the green sheet is peeled off from the carrier tape on the way. The ceramic green sheet separated from the carrier tape is placed on a carrier belt and cut into a predetermined size by a cutting and adsorbing unit like ceramic green sheets 1a and 1b as shown in FIG. Then, the cut ceramic green sheets 1a and 1b are conveyed to another stacking position and stacked alternately.

Next, as shown in FIG. 9, a plurality of ceramic green sheets 1a and 1b having the internal electrode patterns 2a and 2b are laminated, and further some ceramic green sheets 1a and 1b having no internal electrode patterns 2a and 2b are laminated. The ceramic green sheets 1 and 1 are stacked on top of each other, and these are pressure-bonded to each other to form a laminated body. Here, the ceramic green sheet 1
For a and 1b, the internal electrode patterns 2a and 2b, which are displaced by half the length in the longitudinal direction, are alternately stacked and crimped. After that, the laminated body is cut into a desired size to produce a laminated raw chip, and the raw chip is fired. The laminated chip thus obtained is a cube-shaped laminated body having electrodes 2a and 2b alternately exposed on both end faces. Next, conductive paste is applied to both ends of the fired multilayer chip, and baked to form electrode terminals on both ends, thus completing the multilayer ceramic capacitor.

The monolithic ceramic electronic component typified by such a monolithic ceramic capacitor requires that the internal electrode patterns such as the above-mentioned internal electrode patterns are accurately stacked, or else the desired electrical electrical characteristics are obtained. The characteristics cannot be obtained. However, as the size of multilayer ceramic electronic components has become smaller and smaller, the thickness of ceramic green sheets has become thinner and thinner.Thus, in the process of transporting the cut ceramic green sheets, stacking them, and further applying pressure to temporarily bond them, It is difficult to secure sufficient stacking accuracy because the sheets are likely to stretch and misalign.

Therefore, conventionally, while the ceramic green sheet is placed on the carrier film, the ceramic green sheet is cut into a predetermined shape together with the carrier film, and the ceramic green sheets with the carrier film are sequentially laminated while being positioned. A method of peeling the carrier film has been proposed.

[0008]

However, in this ceramic green sheet laminating method, since the side of the ceramic green sheet on which the internal electrode pattern is printed is laminated downward, the positioning pattern printed together with the internal electrode pattern is laminated. Therefore, the ceramic green sheet cannot be positioned. Therefore, positioning holes are provided at predetermined positions at the four corners of the ceramic green sheet with carrier film, and the positioning holes are aligned and inserted into the positioning pins on the stacking table on which the positioning pins are projected so as to correspond to the positioning holes. While aligning the ceramic green sheets, the ceramic green sheet with a carrier film is then conveyed onto a stacking stage having positioning means corresponding to this positioning table, the ceramic green sheets are stacked there, and the carrier film is peeled off. That method has been proposed.

However, it is quite difficult to insert the four positioning holes provided at the four corners of the ceramic green sheet with a carrier film into the four positioning pins on the positioning base at the same time. Therefore, even when the robot using the manipulator is used for positioning and stacking, it takes time to position the ceramic green sheet with the carrier film on the positioning stand, and the cycle time becomes long. Therefore, an object of the present invention is to provide a ceramic green sheet laminating method capable of easily positioning a ceramic green sheet with a carrier film.

[0010]

That is, in the present invention, in order to achieve the above-mentioned object, a ceramic green sheet with a carrier film, which is punched into a certain shape and has positioning holes at four corners, corresponds to the positioning holes. Move to a positioning table on which a positioning pin is projecting, and place two or three of the ceramic green sheets with carrier film.
While positioning and inserting one positioning hole to the corresponding positioning pin on the positioning base, place the ceramic green sheet with the carrier film on the positioning base, then insert the other positioning holes into the corresponding positioning pin, and then After stacking a ceramic green sheet with a carrier film on another ceramic green sheet on a stacking stage having a positioning table and corresponding positioning means, the carrier film on the stacked ceramic green sheet is peeled off, and then the above-mentioned steps are prescribed. The ceramic green sheet laminating method is characterized in that a predetermined number of ceramic green sheets are laminated by repeating the number of times.

[0011]

In the method of laminating a ceramic green sheet according to the present invention, first, the positioning holes provided at the four corners of the ceramic green sheet with a carrier film are not aligned with the positioning pins on the stacking table at the same time, but the second
Align one or three. Therefore, the positioning hole and the positioning pin can be easily aligned. Moreover, after aligning the two or three positioning holes with the positioning pins and inserting them, the ceramic green sheet with carrier film is made parallel to the positioning base so that the remaining two or one positioning holes naturally correspond to it. It is positioned on the positioning pin and can be easily inserted. This allows the ceramic green sheet with the carrier film to be accurately placed at a predetermined position on the positioning table.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a plan view showing an entire laminating apparatus used for carrying out the method for laminating ceramic green sheets according to the present invention. With this device,
A magazine 11 is used in which ceramic green sheets a with carrier films, which have been cut into a predetermined shape together with the carrier film, are vertically stacked and housed.
1 is placed in the magazine storage 10. This magazine 11
As shown in FIG. 2, the rectangular ceramic green sheets a with carrier film, which are cut between vertical columns 12, are vertically stacked and housed. The ceramic green sheets a with carrier film are opposed to each other. Each side to be positioned is positioned and held in a state of being sandwiched from both sides by the pillar 12. The ceramic green sheet a with a carrier film is stored in the magazine 11 with the carrier film side facing up.

As shown in FIG. 1, a plurality of magazines 11 are placed in the magazine storage space 10.
, The ceramic green sheets having the same internal electrode pattern are collectively stored, and the ceramic green sheets having no internal electrode pattern are also collectively stored in another magazine 11.

The ceramic green sheet a with a carrier film stored in these magazines 11 has four positioning holes b at predetermined positions at its four corners.
FIG. 4 shows an example of the perforation positions of the positioning holes b perforated in the ceramic green sheet with carrier film a. In this example, the suction position where the suction cups 25 of the suction head 22 of the manipulator 20 described later suction-holds. Positioning holes b are formed on the outside of e. As shown in FIG. 1, another magazine storage 70 is provided beside the magazine storage 10.
Are arranged in the magazine storage area 70. The magazine storage area 70 is a magazine 1 in which stacked ceramic green sheets d are stored.
1 is put.

On the opposite side of the magazine storage 70, as shown in FIG.
The positioning table 30 shown in FIGS. 3 and 5 is arranged,
Positioning holes b formed in the ceramic green sheet with carrier film a are formed on the positioning table 30.
Corresponding to, four positioning pins 31 are provided in a protruding manner.
Further, the positioning table 30 has an air passage 32 (see FIG. 5) for holding the ceramic green sheet a with a carrier film placed on the positioning table 30 with a negative pressure on the table, and through the air passage 32. The sucked air attracts and holds the ceramic green sheet a with the carrier film on the positioning table 30. As shown in FIG. 1, a manipulator 20 is provided as a first conveying means for conveying the ceramic green sheet a with a carrier film over the magazine storages 10, 70 and the positioning table 30. As shown in FIG. 2, the manipulator 20 has an arm 21 that is rotated by a rotating mechanism 23. The arm 21 extends and contracts, and has an upper and lower cylinder 24 at its tip.

Further, a suction head 22 for adsorbing to the surface of the carrier film of the ceramic green sheet a with a carrier film and holding the film is provided at the tip of the up and down plunger of the up and down cylinder 24.
From the lower surface of the suction head 22, four suction cups 25 are provided via an actuator 26 such as an air cylinder. The suction cups 25 have a negative pressure at the tip thereof, and the ceramic green sheet a with a carrier film is attached thereto. Adsorb and hold. In the illustrated example, the actuator 26
Thus, the four suction cups 25 can be individually moved up and down.

The suction head 22 of this manipulator 20
Is movable over the entire range of the magazine storages 10, 70 and the positioning table 30, and the manipulator 20 is driven and controlled by, for example, a computer, so that the carrier films are moved from the magazines 11 on the magazine storage 10 in a predetermined order. The attached ceramic green sheet a is taken out and conveyed onto the positioning table 30.

As shown in FIGS. 1 and 3, a stacking stage 40 is arranged near the positioning table 30. The stacking stage 40 is movably arranged in the left-right direction in FIG. 1 along a guide rail 43, and is moved by a moving mechanism 41 including a ball screw and a motor. Positioning pins 47 are provided on the stacking stage 40 so as to correspond to the positioning pins 31 on the stacking stage 30.

Further, when the stacking stage 40 stops near the positioning table 30, the stacking manipulator 44 which is the second carrying means for carrying the ceramic green sheet a with a carrier film from the positioning table 30 to the stacking stage 40. Is provided. As shown in FIG. 3, the stacking manipulator 44 is composed of a vertical cylinder 42 which is horizontally moved by a horizontal cylinder 46 in FIG.
And a suction head 45 that is vertically moved by the upper and lower cylinders 42. As shown in FIG. 5C, this suction head 45 has an air passage 48 for holding the ceramic green sheet a with a carrier film therein by using the suction surface, which is the lower surface, as a negative pressure. ,
By the air sucked through the air passage 48, the ceramic green sheet a with a carrier film is adsorbed and held on its adsorption surface, and the ceramic green sheet a with a carrier film is conveyed from the positioning table 30 to the laminated stage 40. Further, the suction surface of the suction head 45 is provided with a recess 49 corresponding to the positioning pin 31, and when the suction head 45 descends, the positioning table 30 is provided.
The positioning pin 31 of is fitted into this recess.

A pressing machine 60 is arranged on the right end side of the guide rail 43 in FIG. As shown in FIG. 6, in this press machine 60, a pressing plate 61 containing a heater (not shown) is moved up and down, and the laminated stage 4 is placed under the pressing plate 61.
When 0 is inserted, the ceramic green sheets a stacked on the stacking stage 40 are pressed from above while heating.

Further, as shown in FIG.
0 and the laminating manipulator 44, a peeling roller 50 is arranged as a means for peeling the carrier film from the laminated ceramic green sheets. Figure 7
As shown in FIG. 1, the peeling roller 50 has a cylindrical roller head 52 that is rotated while the peripheral surface is negative pressure, and is moved up and down along the guide 51 in FIG. Is. As shown in FIG. 2, the roller head 52 has a flat portion 53 on a part of its peripheral surface.

Next, a method for laminating ceramic green sheets according to the present invention using this apparatus will be described. As shown in FIG. 1, each magazine 11 is placed at a predetermined position in the magazine storage space 10. In each of these magazines 11,
A ceramic green sheet each having a predetermined internal electrode pattern and a ceramic green sheet with a carrier film having no internal electrode pattern are housed.

In this state, as shown by the solid line in FIG. 2, first, the suction head 22 of the manipulator 20 is moved to the magazine storage area 1 by the suction head 22.
The ceramic green sheet a with a carrier film is taken out from the predetermined magazine 11 placed at 0, and is conveyed onto the positioning table 30 as indicated by the chain double-dashed line. Then, as shown in FIG.
In No. 2, the carrier film side is adsorbed and the ceramic green sheet a with a carrier film is conveyed onto the positioning base 30, and the positioning holes b are passed through the positioning pins 31 on the positioning base 30 for positioning.

Here, not all of the four positioning holes b are positioned on the positioning pin 31 at the same time, but two or three of them are positioned on the corresponding positioning pin 31. When positioning the two positioning holes b, two positioning holes b located on diagonal lines relative to the two positioning holes b located on the same side of the ceramic green sheet with a carrier film a are positioned corresponding to the positioning pins 31.
It is better to position it at.

Next, as shown in FIG. 5B, the suction head 22 is lowered to release the suction of the ceramic green sheet a with a carrier film by a part of the suction cups 25, and first, the positioned positioning holes b are formed. Insert into the positioning pin 31 on the positioning table 30. As a result, the other two or one positioning holes b are naturally aligned with the corresponding positioning pins 31 and can be inserted into the positioning pins 31. As a result, the ceramic green sheet a with the carrier film is arranged at a predetermined position on the positioning table 30. The ceramic green sheet a with a carrier film placed on the positioning table 30 is adsorbed and held on the positioning table 30 by the air sucked through the air passage 32.

Next, the stacking manipulator 44 shown in FIG.
The suction head 45 moves to a position above the positioning table 30 as shown in FIG. 5C, and sucks and holds the ceramic green sheet a with the carrier film positioned therein. At this time, the positioning pin 31 on the positioning base 30
Is fitted into the recess 49 when the suction head 45 descends.

Thereafter, as shown in FIG. 5 (c), the ceramic green sheet a with a carrier film is pulled up from the positioning base 30 and, as shown in FIG. 3, this is conveyed to the laminating stage 40 and placed there. Here, the positioning pin 47 is fitted into the positioning hole b of the ceramic green sheet a with a carrier film, and the ceramic green sheet a is positioned.

Then, the driving mechanism 41 moves the laminating stage 40 to below the peeling roller 50. Here, as shown in FIG. 7A, the flat portion 53 of the peripheral surface of the roller head 52 of the peeling roller 50 is attracted to the edge of the carrier film c. After that, as shown in FIG. 7B, the roller head 52 rotates in the direction shown by the arrow, and as shown by the arrow, the entire peeling roller 50 moves at the same speed as the peripheral speed of the roller head 52. In (b), it moves to the right and peels the carrier film c from the ceramic green sheet d. Then, the negative pressure on the peripheral surface of the roller head 52 is released, and the carrier film c is discarded.

Next, the laminating stage 40 is returned to the position of the laminating manipulator 44, and another ceramic green sheet a with a carrier film is formed on the laminating stage 40 in the same manner as described above.
Can be placed. Next, the driving mechanism 41 moves the stacking stage 40 to the pressing machine 60, where the stamping plate 61 is moved.
Is lowered and the ceramic green sheets a stacked on the stacking stage 40 are pressed from above while heating.

Next, the driving mechanism 41 moves the laminating stage 40 to below the peeling roller 50, where the carrier film c is peeled from the ceramic green sheet d in the same manner as described above. Thereafter, similarly, the ceramic green sheet a with a carrier film is overlaid on the laminating stage 40, and the heating / pressurization and the peeling of the carrier film c are repeated in a predetermined order, and the ceramic green sheets are laminated in a predetermined order. The laminated body d thus completed is completed. Then, the manipulator 20 stores the stacked body d in the magazine 11 on the magazine storage area 70.

[0031]

As described above, according to the present invention, a ceramic green sheet with a carrier film can be easily positioned by placing it on a predetermined position on a positioning stand, so that accurate stacking can be performed with a short cycle time. Can be carried out, and productivity can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an overall example of an apparatus for carrying out a ceramic green sheet laminating method according to an embodiment of the present invention.

FIG. 2 is a side view of essential parts near a magazine storage and a positioning table in the apparatus example.

FIG. 3 is a side view of a main part in the vicinity of a positioning base and a stacking stage of the apparatus example.

FIG. 4 is a plan view showing an example of a ceramic green sheet with a carrier film used in the ceramic green sheet laminating method according to the example.

FIG. 5 is a side view showing a positioning process on the stacking table in the ceramic green sheet method according to the embodiment.

FIG. 6 is a side view of a main part of a press machine of the same device example.

FIG. 7 is a side view of a main part of a carrier film peeling mechanism of the apparatus example.

FIG. 8 is an exploded perspective view showing an example of a layer structure of a laminated ceramic capacitor.

FIG. 9 is a perspective view showing a stacking order of ceramic green sheets when manufacturing a ceramic capacitor.

[Explanation of symbols]

c Carrier film a Ceramic green sheet with carrier film b Positioning holes for ceramic green sheet with carrier film 11 Magazine 10 Magazine storage 30 Positioning table 20 Manipulator 31 Positioning pin on positioning table 40 Laminating stage 44 Laminating manipulator 60 Press 50 Peeling roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // H01G 4/12 364

Claims (1)

[Reference number] 0050151-01 [Claims] 1. A method of laminating ceramic green sheets, wherein a ceramic green sheet with a carrier film, which is punched into a certain shape and has positioning holes at four corners, has positioning pins protruding corresponding to the positioning holes. Move to the positioning table and place the ceramic green sheet with carrier film on the positioning table while aligning and inserting the two or three positioning holes of the ceramic green sheet with carrier film to the corresponding positioning pins on the positioning table. , Then, other positioning holes are also inserted into the corresponding positioning pins, and then the ceramic green sheet with a carrier film is overlaid on the other ceramic green sheet on a laminated stage having positioning means corresponding to this positioning base, Stacked ceramic greens A method for laminating a ceramic green sheet, characterized in that the carrier film on the sheet is peeled off, and the above steps are repeated a predetermined number of times to laminate a predetermined number of ceramic green sheets.