JPS60244014A - Method of producing laminated ceramic part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for manufacturing electronic components such as multilayer ceramic capacitors and multilayer chip inductors used as multilayer chip electronic components.

[Prior art]

An example of this type of manufacturing method will be explained with reference to FIG. 1, taking a multilayer ceramic capacitor as an example.

First, a slurry containing a dielectric, an organic binder, and a plasticizer is formed into a film on a carrier sheet 12 by Dr. Plaid 11 as shown in FIG. Create sheet 14. Then the first
As shown in the figure.

Green sheet 14 to green sheet 15 with carrier
is peeled off and stocked in a punching case 17, which is punched out using a punching device 16 into a shape that is slightly larger than a laminated mold, which will be described later. Next, an internal electrode pattern including alignment markers is printed and dried. Furthermore, align the alignment marker with the reference position so that the internal electrode pattern is at the designed position, as shown in Figure 1C.
The layers are stacked in the punching die 18. And Figure 1 d
As shown in the figure, after the set number of sheets have been laminated, the heat press machine 19
Press and cut into regular shapes.

Fire. Finally, external electrodes are formed.

In this case, a prescribed number of sheets with the same shape are prepared with internal electrodes printed on them, and the internal electrode printed notes are aligned one by one, punched out, and laminated into a mold. Moreover, since the internal electrode printed sheets are stacked in such a way that the effective internal electrodes are alternately short-circuited to the external electrodes within the capacitor, the sheet cannot be opened unless the orientation is changed alternately.

When observing the cut surface of raw chips stacked using this conventional method, the misalignment of the internal electrodes is half of the cutting margin (approximately 1 degree).
It is about the same level as the throat, and the variation in the deviation is very large. This becomes more noticeable as the number of laminated sheets increases. In a multilayer ceramic capacitor, this lamination misalignment is located in a region where there is a large density difference between the internal electrode part and the cut margin (part without internal electrode), so when a voltage is applied, a short circuit occurs with the opposing electrode or the opposing external electrode. It appeared.

Reliability will be greatly reduced. This lamination misalignment is caused by the printing accuracy of the alignment marker and the alignment accuracy, and it is extremely difficult to improve the accuracy of both of them because printing smudges and the like hinder the improvement of the accuracy.

[Purpose of the invention]

The present invention aims to eliminate this drawback and provide a highly reliable multilayer ceramic component in which the degree of lamination misalignment is reduced.

[Structure of the invention]

In the present invention, the ceramic sheet 1 is adsorbed onto a suction pad through a series of steps of punching the ceramic sheet 1, printing internal electrodes, drying, and laminating the ceramic sheet 1. Well, go ahead.

= 3- This is a method that eliminates printing accuracy and stacking misalignment due to marker alignment.

That is, in the present invention, it is sufficient to consider two items (printing accuracy + lamination accuracy) as the error of lamination misalignment, whereas conventionally, (marker printing accuracy and marker alignment accuracy) must be added to this. ] The causes of lamination misalignment can be reduced and the degree of misalignment can be made extremely small.

〔Example〕

Next, the present invention will be explained in detail with reference to FIG.

As a dielectric magnetic material, Pb (Nb 1/2. F
A composite perovskite dielectric material having a composition of e 1/2) (W 1/3) 03 was used. Mix this material and pre-fire.

A slurry is created from the polyvinyl butyral organic binder and solvent by wet grinding. Next, as shown in Figure 2a,
A green sheet 24 with a carrier having a green note of 30 μm is prepared using a doctor plaid 21.

23 is a dryer.

4- The green sheet 25 is peeled off from the carrier-attached green sheet 24 in the process shown in FIG.

While punching out a 10100x120 shape using the punching device 26, it is sucked onto a suction pad 30 serving as a holding means.

Then, as shown in FIG. 2C, an internal electrode pattern is printed on the sheet 1-25' through the screen 32 by the printing machine 31 while the suction pad 30 remains in the suction state. Next, as shown in Figure 2d.

Drying is performed using a hot air dryer 33. Of course, this step is also carried out until the suction pad 30 is able to adsorb it.

In Fig. 2e, the sheet 25' after drying is attached to the suction pad 3.
It is laminated to the punching die 28 at 0. and.

When a predetermined number of sheets are laminated, a heat press machine 29 performs thermocompression bonding.

In this case, the number of internal electrode printed sheets was 61, and the internal electrode paste was a mixture of Ag powder, Pd powder, an organic binder, and a plasticizer. This laminate is 12x16m
+n using a peripheral blade cutting machine.

ノ＼１１ Demainder, firing, and application of external Ag electrode.

After baking, the axial stability test of the laminated ceramic capacitor was conducted. The results are shown in Table 1.

In addition, the cutter of the extraction device 26 is connected to the cooling pipe 3 for heat protection.
I installed 4. The printing machine 31 used nylon mesh #200 for screen printing, and the coater used was a modified type of gravure coater.

Although the present invention has been described in connection with a multilayer ceramic capacitor in Table 1, the present invention can also be applied to a multilayer chip inductor. In the case of chip inductors, there are differences in that the ceramic is a magnetic material (e.g. ferrite) and the internal electrode pattern is formed by forming a through hole in one place in the layer so that the upper and lower layers are electrically conductive. is basically the same process. Even with chip inductors, the internal electrodes can be positioned with high precision, improving reproducibility.

〔Effect of the invention〕

In the conventional method, the process was a single process, not a continuous process, and the internal electrode printed sheets were stored in a stockyard, so positioning required skill.9 However, with the method of the present invention, productivity can be greatly increased. can be improved. Furthermore, it is possible to provide a highly reliable multilayer ceramic component by reducing the degree of sheet lamination misalignment.

[Brief explanation of drawings]

7- is a diagram. In the figure, 11, 2] is Doctor Plaid, 12.22 is a carrier sheet, 1.3.23 is a dryer, 14,
24 is a green sheet with a carrier, 15.25 is a green sheet, 16.26 is a punching device, 18.28 is a punching die, 19.29 is a heat press machine, and 30 is a suction pad. 31 is a printing machine, 32 is a screen, and 33 is a hot air dryer. Agent (7127) Patent attorney Yosuke Goto 8- (b) (C) (d) (C) 1p#1 rρ1 Hongchen laminated heat pressure agitation

Claims (1)

[Scope of Claims] 1. A method for manufacturing ceramic parts in which internal electrodes are printed and laminated on ceramic green sheets. (i) A step of continuously forming a ceramic green sheet on a carrier film of an organic film. (11) After this, the step of peeling the green sheet from the carrier film and punching it into a desired size. (iii) A step of printing conductive internal electrodes on the back surface of the sheet through a screen while the holding means holds the green sheet punched out in step (11). (iv) Subsequently drying the sheet while being held in the holding means. (V) After this, a step of inserting the sheet obtained in the step (iv) into the mold. (From V0 onwards, the steps (11) to (v) are repeated to laminate the sheets. (Vl) A step of thermocompression bonding the sheets laminated in the step (vD). Method of manufacturing ceramic parts.