JPS62226613A - Manufacture of trimmer type laminated ceramic capacitor - 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] [Field of Commercial Application] The present invention relates to a method for producing a trimmer-type laminated ceramic leaf/tensor.
The present invention relates to an improvement in a method for forming a purulent ceramic layer by forming a three-part electrode, laminating and integrating, cutting, and forming a ceramic capacitor.

[Conventional technology]

Generally, in order to produce a trimmer-type A-layer ceramic/tensor, first a ceramic powder such as titanium or barium is mixed with a solvent such as methylcerone.

After mixing with a plasticizer such as dioctyl phthalate and a binder such as polyvinyl butyral, and stirring with mud, a ceramic green sheet (hereinafter abbreviated as "green sheet") is produced using a doctor blade method or the like. C Manufacture.

Next, cut all of this Brie/sheet into the desired size9.
To obtain the green sheet membrane 1 shown in FIG. 2(a), the inner 'WL pole paste is printed at a desired position on this blue/sheet membrane 1 by screen printing or the like, and as shown in FIG. 2(b). In addition, if the printing film is formed successfully and the Jet layer is rotated by 180 degrees, the pattern spacing in the electrode formation direction will be different from the pattern at the adjacent regular position. Lay out the pattern by a predetermined amount. After that, layer the NFF sheets of this printed film 2 by rotating them alternately 180 times, and then layer all the green sheet films 1 as a protective layer underneath. Then, by pressurizing and integrating them, a laminate 3 is obtained in which the circular portion 11 of the outermost layer 11 is exposed as shown in FIG. 2(c).

Next, this laminate 3 is cut and separated to form a trimmer-type multilayer ceramic capacitor (hereinafter referred to as
Next, the above-mentioned raw chips 4 are completely fired at a temperature suitable for firing ceramic powder, and the external electrodes 7 are completely formed to form a trimmer-type multilayer ceramic as shown in Fig. 2(f). 5 capacitors have been manufactured [Problems to be solved by the invention] However, this method of manufacturing trimmer type multilayer ceramic capacitors has the following drawbacks:
It is difficult to position the cutting into individual raw chips 4 from 0 (b). Therefore, the cutting margin widths t and m between the internal chips 6 shown in Fig. 2 (b) are set to the specified lengths. It is necessary to set the

(c) As a method of checking the misalignment of the circular electrode 6, see Figure 2 (
In order to check the arrow direction of the cutting margin m in b), cut the t-raw chip 4kA-A' plane shown in Fig. 2(d), and check the internal voltage as shown in the cross-sectional view of Fig. 2(e). The body must be 6.

2) The length of the insulation I%N (the portion of cutting margin 1t of 2 [m(d)) on the narrow side of the raw chip 4 is cut! Considering the variation in R degree, a minimum width of 200 μm or more is required. Easy to check the exposed state of the electrode.

Trimmer-type lamination that can be cut without considering the 1-needle force on the 111th surface of the capacitor, thus allowing many products to be obtained from a single sheet, as well as improving productivity and achieving uniform quality. An object of the present invention is to provide a method for assembling a ceramic capacitor.

[Means for solving problems]

The manufacturing method of the trimmer type Sakaki layer ceramic capacitor of the present invention includes a step of mixing ceramic powder with a Miso solvent, a plasticizer, and a binder to form a slurry, and forming a film of the slurry and drying it to form a green sheet. and forming a strip-like pattern spaced apart from each other by 31 feet in the direction of forming the green field.
The process of printing and forming 4 pastes, laminating the required number of sheets so that the vertically adjacent 1'1 part electrode patterns are shifted by a certain distance in the electrode forming direction according to the desired static valley, and integrating 710 sheets. , a step of forming a multilayer ceramic capacitor assembly with one layer of internal pole patterns exposed on one surface of the outermost layer, a step of cutting the multilayer ceramic capacitor assembly into individual capacitors, and a step of separating the inside of the capacitor. The surface including the exposed both sides of the circular electrode is removed from the electrode end face and the exposed surface of the inner electrode of the outermost layer. The step of firing the inner S electrode and the outer 'I'
The method includes a step of forming a c-pole.

〔Example〕

Next, an embodiment of the present invention will be explained with reference to all the drawings. 0 Figure 1 (a) to □□□) are trimmer-type layered capacitors shown in order of process to explain an embodiment of the present invention. A cross-sectional view of the main process.

First, as shown in Figure 1, barium titanate ceramic powder is mixed with an organic solvent such as methyl cellosolve, a plasticizer such as dioctyl phthalate, and a binder such as polyvinyl butyral to produce slurry. After that, a green sheet film 11' is produced using a doctor blade method or the like and cut into a desired size.
Next, as shown in FIG.
'Print the three-part electrode paste and make a strip-shaped internal electrode 16.
is formed to form a companion printing film 12. Note that the internal electrode 16
When the pattern arrangement is rotated by 180 with respect to the reference position,
It is best to arrange the patterns in such a way that the patterns are shifted by a certain amount in the direction of electrode formation.Next, as shown in No. 11N(c), calculate the number of printed films 12 necessary to obtain the desired capacitance. A laminated body 13t- which is laminated by rotating each other by 180 degrees and integrated under pressure, with the internal electrode 16 exposed on the surface of the outermost layer.
Then, as shown in FIG. 1(d), this laminate 13 is cut and separated into predetermined dimensions, so that the uppermost internal electrode 16 is exposed on the surface of the outermost layer, and the other internal electrodes 2 are Then, as shown in Figure 1(e) and (f), the exposed outermost layer surface of the internal conductor %16 and The surface of the raw chip 14 excluding the internal electrode number exposed end face B+B''a is coated with a tipping means using the same slurry as the green sheet membrane 11 described above, and dried to form a U-shaped cross section. A seven-shaped Yusei chip 14a is obtained with the protective layer 18.

Note that the protective layer 18 covers the internal electrode 2 as shown in FIG. 1(g).
There is no problem even if only the exposed sides of the chip 14a' are coated and formed.The raw chip 14a' is then fired at a temperature suitable for firing the ceramic powder, and the internal electrodes 18! protruding end surface B,
External electrodes (not shown) are completely formed on B', and the trimmer type laminated ceramic rod/tensor (not shown) of the present invention is exposed.

〔Effect of the invention〕

As explained above, if the present invention ↓n, the first order effect will be obtained.
〇(1) Since the protective layer on the side surface is completely formed after the trimmer type 8 is completely molded as a raw chip of layered ceramic/temp, there is no need to provide one internal pole up to the side surface of the trimmer type multilayer ceramic capacitor.Therefore, the conventional example There is no need to provide the cutting residual width t2 shown in Figure 2 (b).0 (2) Since the internal electrodes are exposed to the sides of the trimmer type multilayer ceramic capacitor, the misalignment shown in Figure 1 (d) is easily avoided. can be confirmed.

(3) In the conventional manufacturing method, it was difficult to narrow the protective hole 1- on the side surface of the trimmer-type layered ceramic capacitor from the point of view of the cutting point. However, in the manufacturing method of the present invention, the ceramic powder It is possible to increase the voltage to a range that does not cause problems in terms of the rated voltage of EE-resistant products.

That is, if the present invention is applied, an excellent fL7icllJ type product 1-ceramic capacitor having the same reproductive properties as above and a uniform quality can be obtained.

[Brief explanation of drawings]

FIGS. 1(a) to (g) are explanatory diagrams of the main steps of a trimmer-type multilayer ceramic capacitor shown in the order of steps to explain one embodiment of the present invention, and FIG. 1(a) shows a ceramic green sheet film. FIG. 1(b) is a plan view of the H-printed film, FIG. 1(e) is a plan view of the laminate, FIG. 1(d) is a perspective view of the raw chip, and FIG. 1(e) is a plan view of the H-printed film. Line BB' of the raw chip after forming the protective layer [angular cross-sectional view, Fig. 1] is a perspective view of the raw chip after forming the protective layer, Fig. A cross-sectional view of the raw chip in the direction perpendicular to the line B-8',
Figures 2 (a) to (f) are explanatory diagrams of the main steps shown in the order of steps to explain an example of the conventional method for manufacturing a trimmer-type multilayer ceramic capacitor, and Figure 2 (a) shows the ceramic green sheet film 2(b) is a plan view of the printed film, FIG. 2(c) is a plan view of the laminate, and FIG. 2(d) is a plan view of the printed film.
Figure 1(e) is a perspective view of the raw chip, and Figure 1(e) is a perspective view of the raw chip.
FIG. 1(f), which is a cross-sectional view of plane A', is a perspective view of the trimmer type multilayer ceramic capacitor after external electrodes are formed. 1.11... Green sheet membrane, 2.12...
...Printed film% 3,13...Laminated body, 4.
14...Raw chips, 14a...+31
．． Raw chip with layers formed, 5... Trimmer type laminated ceramic comb/tensor, 6°] 6... Internal 11f pole, 7... External electrode, 18... ...
- Transcription layer. Agent Patent Attorney Susumu Hara 1 puff...] (C) 1 puff (C) 1 puff (C) 2 foil puffs

Claims (1)

[Claims] A step of kneading an organic solvent, a plasticizer, and a binder into ceramic powder to form a slurry, a step of forming the slurry into a film and drying it to form a green sheet, and a step of forming a green sheet on the green sheet at regular intervals in the direction of forming external electrodes. A process of forming a strip-shaped internal electrode pattern by printing an internal electrode paste, and laminating a required number of internal electrode patterns so that vertically adjacent internal electrode patterns are shifted by a certain distance in the electrode shape emission direction according to the desired capacitance. and pressurizing and integrating the capacitors to form a multilayer ceramic capacitor assembly with one layer of internal electrode patterns exposed on one surface of the outermost layer; and cutting and separating the multilayer ceramic capacitor assembly into individual capacitors; a step of coating the surface of the capacitor, including at least both exposed side surfaces of the circular electrode by separation, excluding the circular electrode extraction end surface and the exposed surface of the inner electrode of the outermost layer, with the same slurry as the slurry and drying; A method for manufacturing a trimmer-type multilayer ceramic capacitor, comprising the steps of firing the capacitor and forming an external electrode on the circular electrode extraction surface.