JPS5929412A - Method of producing laminated condenser - 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 The present invention relates to a method of manufacturing a multilayer capacitor with excellent manufacturing efficiency.

A typical example of conventional methods for manufacturing multilayer capacitors is
As shown in FIGS. 1 and 2, an electrode 12 is provided on a green sheet 11 made of ceramic or the like, and a plurality of sheets 11 are
The electrodes 12 are stacked one on top of the other so that they are alternately led out to opposite ends, are pressed and bonded, and then an external electrode 13 is attached to each lead-out end of the electrodes 12. However, in the multilayer capacitor manufactured in this way, the predetermined electrodes 12 are applied exclusively to the green sheet 11 by printing, so the green sheet may be stretched, damaged, or covered by the pressure applied during printing. However, they had poor dimensional accuracy and lacked stability, significantly reducing manufacturing efficiency and yield. In addition, Green Sea 1- was prone to stretching and breakage during handling during processing. This made it impossible to print fine figures. Furthermore, when applying electrodes directly onto the green sheet,
Depending on the combination of the binder in the green sheet and the varnish in the electrode material, the electrodes may diffuse into the green sheet, lowering its insulation resistance value and reducing reliability.

Therefore, the present invention aims to provide a manufacturing method whose main purpose is to obtain a multilayer capacitor with excellent manufacturing efficiency and stable characteristics.

To summarize, the present invention consists in using a plastic film having an electrode formed on one side and a green film formed on the other side as a green sheet. Other objects and features of the invention will become apparent from the embodiments described below with reference to the drawings. Although this embodiment shows the case where a plurality of multilayer capacitors are obtained at the same time, it is of course not prohibited to manufacture them one by one.

The green sheet shown in Figure 3 is used in the present invention.
1 is a plan view, and FIG. 4 is a sectional view of the same side.

In the figure, a plastic film made of polyethylene, polypropylene, etc. is shown, and a plurality of electrodes 3 are provided on one surface of the film 2 in a grid pattern by, for example, printing. A green film 4 is applied to almost the entire surface of the other surface of the film 2 by, for example, a doctor blade method or a spray method. in this case,
The green film 4 must be applied so as to face all the electrodes 3 with the plastic film 1 in between. Alternatively, the electrode 3 and the green film 4 applied to both sides of the niblastic film 2 may be applied first, but the electrode 3 is applied first and dried, and then the green film 4 is applied and dried. It is preferable. Reference numeral 5 in the figure indicates holes formed on both side ends of the plastic film 2 and used for positioning, feeding, etc.

A plurality of green sheets 1 thus formed are prepared, and then these are stacked and pressed together as shown in FIG. 5. That is, they are stacked so that the green film 4 surfaces of the second layer green sheet 1 are in contact with the electrode 3 surfaces of the first layer green sheet 1 (the same applies hereinafter). In this case, the electrodes 2, which are interposed between each other with the green film 4 interposed therebetween, must be alternately slid slightly in the left and right directions in the figure. This is the same as when manufacturing a normal multilayer capacitor.

The thus stacked product is then cut at the position indicated by the arrow in FIG. 5 to obtain an independent laminate 6 as shown in FIG. As can be seen from this laminate, the buried electrodes 3 are alternately led out to the opposite end faces.

Next, this laminated body 6 is fired, and then external electrodes 7 are applied to the lead-out portions of the electrodes 3, respectively, to obtain a laminated capacitor as shown in FIG.

What is characteristic here is that the plastic film 2 of the green sheet 1 shown in FIG. Since the heating is carried out at a high temperature of C or higher, the plastic film 2 will be burned away before reaching such a high temperature.At first glance, it seems that voids will be created in the laminate 6 due to the burning of the plastic film 2. However, since this is completely eliminated when the green film 4 is sintered, it does not pose any problem.

Note that the above description and drawings are intended to facilitate understanding of the present invention, and do not specify the present invention. In short, a plurality of green sheets with electrodes and green films formed on both sides of a plastic film can be stacked and fired. Therefore, it goes without saying that various design or processing changes may be made to C without departing from the spirit of the present invention. In particular, in the above embodiment, each laminate 6 was cut out before firing, but it may be cut out immediately after firing.

In accordance with the above, the present invention uses a green sheet in which electrodes and green films are formed on both sides of a plastic film, thereby eliminating any drawbacks such as stretching or tearing of the sheet when applying electrodes (printing). It is possible to significantly improve manufacturing efficiency and yield. In addition, since the electrodes are not applied directly to the green sheet, it is easy to print fine patterns, and the electrodes do not diffuse into the green sheet, so the insulation resistance value and
It is possible to promote reliability improvement. Furthermore, handling of green sheets during the processing process becomes easier, so
It also has the effect of improving productivity, ensuring reliable positioning, and obtaining a multilayer capacitor with excellent dimensional accuracy and stable characteristics.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a general multilayer capacitor, Fig. 2 is a sectional view of the same side, Fig. 3 is a plan view of a green sheet used in the present invention, Fig. 4 is a sectional view of the same side, and Fig. 5 3 is a side sectional view showing a stacked state of a plurality of green sheets, FIG. 6 is a side sectional view of an independent laminate, and FIG. 7 is a side sectional view of a multilayer capacitor obtained by the method of the present invention. It is. 1-Green sheet 2-Plastic film 3-Electrode 4-Green film 6-Laminated body
7- External electrode application person Murata Manufacturing Co., Ltd. 65-

Claims (1)

[Claims] A plurality of green sheets each having an electrode provided on one side of the plastic film and a dielectric green film formed on the other side were stacked and crimped so that the electrodes were alternately led out to opposing ends, and then fired. A method for manufacturing a multilayer capacitor, characterized in that external electrodes are then connected to each of the derived electrodes (=J).