JP2000216038A - Manufacture for laminated electronic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to obtain the same density of laminated element as a conventional one in a short time when a sheet of temporarily bonded one-body laminated element made up of a conductor and a green sheet is pressed permanently. SOLUTION: A manufacturing method includes a forming step for forming a green sheet, a step for manufacturing a conductor, a step for putting the conductor between the green sheets and bonding temporality by press to form a sheet of one-body laminated element, and a main pressing step for pressing the temporarily bonded laminated element permanently under pressure larger than that of the temporarily bonded laminated element. The main pressing steps are carried out several times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multilayer electronic component such as a multilayer inductor component or a ceramic composite component, which is widely used in electrical products such as small digital electronic devices and OA devices.

[0002]

2. Description of the Related Art In recent years, high-density mounting has been progressing along with miniaturization and thinning of digital electronic devices and the like. In the field of electronic components, chip components having a size of 1.0 × 0.5 mm have been put to practical use.

In the field of noise suppression components, as digital electronic devices become smaller and thinner, multilayer inductor components and L
There is an increasing demand for miniaturization of C composite parts and the like.

Hereinafter, a conventional method for manufacturing a multilayer inductor component will be described with reference to the drawings.

FIG. 7 is a process chart showing a conventional method for manufacturing a laminated inductor component. FIG. 8 is an exploded perspective view of a laminated body in the laminated inductor component. 7 and 8, first, as a green sheet forming step, a binder is added to the magnetic substance powder and kneaded to prepare a slurry. Then, the slurry is applied on a release film by a doctor blade method or the like. And, it is dried to produce a ceramic green sheet.

Next, as shown in FIG. 8, a plurality of solid film-shaped ceramic green sheets 1 cut out to a predetermined size using the ceramic green sheets, and the solid film-shaped ceramic green sheets 1 are used. The end of the conductor pattern is located at the conductor-embedded through-holes 2a, 3a of the ceramic green sheets 2, 3 in which the conductor-embedded through-holes 2a, 3a are formed at predetermined positions by a punching machine or a punching die. Several kinds of conductor patterns 4a, 4b,
Several kinds of pattern forming green sheets 5a, 5b, 5 obtained by through-hole printing and pattern printing of 4c, 4d
Prepare c and 5d.

[0007] The plurality of solid film-like ceramic green sheets 1 prepared as described above are temporarily press-bonded to a predetermined thickness, and the above-mentioned several kinds of pattern-formed green sheets 5a are placed on the temporarily pressed laminate. , 5b, 5
While temporarily compressing the conductors c and 5d so that the conductor-embedded through holes 2a and 3a are connected to the ends of the conductor patterns 4a, 4b, 4c and 4d, a spiral coil shape is formed in the laminating direction. The layers are laminated until a predetermined number of turns is obtained, and a plurality of solid film-like ceramic green sheets 1 are temporarily pressed thereon to a predetermined thickness to obtain a sheet-like integrated laminate.

Next, in order to increase the density of the laminated body by removing air accumulated between the layers of the sheet-like integrated laminate and to increase the sintering density at the time of firing, the pressure is higher than the pressure at the time of the preliminary press-bonding. It is pressurized by pressure (hereinafter referred to as main pressurization). In this case, the main pressure is applied while gradually increasing the pressure in multiple stages.

Next, as shown in FIG. 9 (a), the above-mentioned fully-pressed sheet-like integrated laminate is cut into a predetermined shape into individual pieces 6, which are fired.

Next, as shown in FIG. 9B, end electrodes 7 are formed on the opposing side surfaces of the individual piece 6 to produce a product.

[0011]

However, in the above-described conventional method for manufacturing a multilayer inductor component, the main pressurization is gradually performed in multiple stages in order to remove air trapped between layers of the sheet-like integrated laminate. Since the pressure must be applied while increasing the pressure, it takes too much time to reduce the productivity, which has a problem in manufacturing.

The present invention solves the above-mentioned conventional problems. When a sheet-like integrated laminate composed of a preliminarily-bonded conductor and a green sheet is fully pressurized, the same laminate density as in the past can be obtained in a short time. It is an object of the present invention to provide a method for manufacturing a laminated electronic component capable of obtaining the following.

[0013]

In order to solve the above-mentioned problems, a method of manufacturing a laminated electronic component according to the present invention comprises a green sheet forming step of forming a green sheet, a conductor forming step of forming a conductor, and a method of forming the conductor. A temporary pressing step of interposing between the green sheets and temporarily pressing them to obtain a sheet-like integrated laminate, and applying a pressure greater than the pressure at the time of the temporary pressing to the temporarily pressed sheet-like integrated laminate. A main pressurizing step of performing a main pressurization, wherein the main pressurizing step is performed a plurality of times. According to this manufacturing method, a sheet-like integrated laminate of a temporarily press-bonded conductor and a green sheet is provided. When the main pressure is applied, a laminate density equivalent to the conventional one can be obtained in a short time.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a green sheet forming step of forming a green sheet, a conductor forming step of forming a conductor, a step of interposing the conductor between the green sheets, and A temporary pressing step of temporarily pressing these to obtain a sheet-like integrated laminate, and a main pressing step of final pressing the temporarily pressed sheet-like integrated laminate with a pressure larger than the pressure at the time of the temporary pressing. According to this manufacturing method, the sheet-like integrated laminate composed of the conductor and the green sheet that have been temporarily compressed is subjected to the pressure during the temporary compression. The main pressurization process, in which the main pressurization is performed at a large pressure, is performed multiple times, so that compared to the conventional pressurization that applies pressure while gradually increasing the pressure in multiple stages as in the past, it is the same as the conventional in a short time Layer density of Thereby, productivity can be improved, and air accumulated between layers of the sheet-like integrated laminate can be effectively released by a plurality of main pressurizations, so that delamination occurring during firing is also eliminated. Therefore, it has an effect that the defective rate can be reduced.

Embodiment 1 Hereinafter, a multilayer inductor component according to Embodiment 1 of the present invention will be described with reference to the drawings.

FIG. 1 is a process chart showing a method for manufacturing a multilayer inductor component according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of a laminated body in the laminated inductor component.

A method for manufacturing a multilayer inductor component according to the first embodiment of the present invention will be described with reference to FIGS.

First, as a raw material of the magnetic material, Ni
O, ZnO, CuO and Fe ₂ O _{3 have} a particle size of 0.1 to
A 1.0 μm powder was prepared, weighed in a predetermined amount, wet-mixed in a ball mill for a predetermined period of time, dried, temporarily calcined and pulverized into a powder, and then wet-pulverized in a ball mill. I do. Then, it is dried with a spray drier to produce a magnetic powder.

Next, a slurry of a magnetic material is prepared by kneading a binder containing polyvinyl butyral resin as a main component and an organic solvent with the magnetic material powder.

As shown in FIG. 1, first, as a green sheet forming step, a slurry of the magnetic substance is applied to a carrier film, which has been subjected to a release treatment on one side serving as a green sheet support, by a doctor blade method. And then dried to produce a magnetic green sheet.

Next, as shown in FIG. 2, a plurality of solid film-like magnetic green sheets 11 cut into a predetermined size using the magnetic green sheets, 11, conductor-embedded through-holes 12 a and 13 a are formed at predetermined positions by a punching machine or a punching die. Several types of conductive patterns 14a, 1 are made of Ag paste so that the ends are located.
Several types of pattern-formed green sheets 15 formed by through-hole printing and pattern printing of 4b, 14c, and 14d
a, 15b, 15c, and 15d are prepared.

The plurality of solid film-like magnetic green sheets 11 prepared as described above are removed until a predetermined thickness is reached.
Temporarily press-bonded at a pressure of 100 ° C. and 0 kg / cm ² , and the above-mentioned pattern-forming green sheets 15a, 15b, 15c, and 15d and conductor-embedded through-holes 12a and 13a were formed on the temporarily-pressed laminate. While temporarily crimping with the same pressure as described above so that the ends of the conductor patterns 14a, 14b, 14c, and 14d are connected, until a predetermined number of turns is obtained so as to form a spiral coil shape in the laminating direction. The sheets are laminated, and a plurality of solid film-like magnetic green sheets 11 are temporarily pressed thereon to a predetermined thickness to obtain a sheet-like integrated laminate.

Next, a pressure of 500 kg / cm ² , which is higher than the pressure at the time of the preliminary press-bonding, is applied to the sheet-like integrated laminate by a pressure of 3 kg / cm ^2.
3 (a), the sheet-like integrated laminate subjected to the main pressure is cut into a predetermined size to form individual pieces 16 at about 900 ° C. Firing, then Figure 3
(B) As shown in FIG.
The end face electrode 18 is formed so as to be connected to the extraction electrode of the inner conductor 17 of No. 6 to obtain a multilayer inductor component.

FIG. 4 shows the density of the laminate with respect to the time during which the main press is performed a plurality of times in the first embodiment of the present invention, and the main press is applied once while gradually increasing the pressure in multiple steps in the conventional example. It is a figure which showed the result of having compared the laminated body density with respect to the time performed.

As is clear from FIG. 4, in the first embodiment of the present invention, the main pressurization is performed only three times every 10 seconds, and the main pressurization is performed once only for 90 seconds as in the related art. It was possible to obtain a laminate density equivalent to that of the laminate. In addition, even when the main press was performed five times for 10 seconds each, it was possible to obtain a laminate density substantially equal to that obtained by performing the main press only once for 90 seconds as in the conventional case.

(Embodiment 2) FIG. 5 is an exploded perspective view showing a multilayer body of a multilayer inductor component according to Embodiment 2 of the present invention.

In the second embodiment of the present invention, a plurality of solid film-like magnetic green sheets 21 cut into a predetermined size are used.
And a conductor buried through hole 22a of a magnetic green sheet 22 in which a conductor buried through hole 22a is formed at a predetermined position using the solid film-like magnetic green sheet 21 by a punching machine or a punching die or the like.
A plurality of conductive patterns 23 are printed with through holes and printed with Ag paste so that the ends of the conductive patterns are positioned at the portions, and a patterned green sheet 24 is prepared. Body green sheet 21 and pattern forming green sheet 2
4, a temporary press-bonding is performed in the same manner as in the first embodiment of the present invention to obtain a sheet-like integrated laminate, and then the sheet-like integrated laminate is subjected to three times of final pressing. is there.

(Embodiment 3) FIG. 6 is an exploded perspective view showing a laminated body of a multilayer inductor component according to Embodiment 3 of the present invention.

In the third embodiment of the present invention, a plurality of solid film-like magnetic green sheets 31 cut to a predetermined size are used.
And a metal wire conductor 32 are prepared, and the prepared solid film-like magnetic green sheets 31 and the metal wire conductor 32 are temporarily press-bonded in the same manner as in the first embodiment of the present invention. After the sheet-like integrated laminate is obtained, the sheet-like integrated laminate is subjected to main pressure three times.

In the first and second embodiments of the present invention, the conductor is formed by through-hole printing and pattern printing. In the third embodiment of the present invention, the conductor is formed by a metal wire. Although described, the conductor may be formed by other screen printing, plating film, metal foil, intaglio printing, and the conductor pattern may be a spiral pattern, a 1/2 turn pattern, or a 3/4 pattern.
Any of a turn pattern, a meandering pattern, and a through pattern may be used.

In the first, second and third embodiments of the present invention, the description has been given of the case where the present invention is applied to a multilayer inductor component. However, the present invention can be applied to other ceramic composite components and LC composite components.

[0032]

As described above, the method for manufacturing a laminated electronic component of the present invention comprises a green sheet forming step of forming a green sheet, a conductor forming step of forming a conductor, and the conductor interposed between the green sheets. And a temporary pressing step of temporarily pressing them to obtain a sheet-like integrated laminate, and a main pressing step of final pressing the temporarily-pressed sheet-like integrated laminate with a pressure greater than the pressure at the time of the temporary pressing. According to this manufacturing method, the sheet-like integrated laminate including the temporarily-pressed conductor and the green sheet is subjected to the pressure during the temporary pressing. Because the main pressurization step of performing main pressurization with a pressure higher than that is performed multiple times, compared to the conventional pressurization that applies pressure while gradually increasing the pressure in multiple stages as in the past, Obtain equivalent laminate density This makes it possible to improve the productivity and to effectively release air accumulated between the layers of the sheet-like integrated laminate by a plurality of main pressurizations. This has an excellent effect that the peeling does not occur and the defective rate can be reduced.

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for manufacturing a multilayer inductor component according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a multilayer body in the multilayer inductor component.

FIGS. 3A and 3B are process diagrams showing a method for manufacturing the multilayer inductor component. FIGS.

FIG. 4 shows the density of the laminate with respect to the time during which the main press is performed a plurality of times in the first embodiment of the present invention, and the main press is applied once while gradually increasing the pressure in multiple stages in the conventional example. Characteristic diagram showing the result of comparing the stack density with time

FIG. 5 is an exploded perspective view showing a multilayer body of the multilayer inductor component according to the second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a multilayer body of the multilayer inductor component according to the third embodiment of the present invention.

FIG. 7 is a process chart showing a conventional method for manufacturing a multilayer inductor component.

FIG. 8 is an exploded perspective view of a multilayer body in the multilayer inductor component.

FIGS. 9A and 9B are process diagrams showing a method for manufacturing the multilayer inductor component.

[Explanation of symbols]

11, 21, 31 Solid film-like magnetic green sheet 12, 13, 22 Magnetic green sheet 14a, 14b, 14c, 14d, 23 Conductor pattern 15a, 15b, 15c, 15d, 24 Pattern forming green sheet 32 Metal wire conductor

Continued on the front page (72) Inventor Kazuo Oishi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term (reference) 4G054 AA05 AB01 AC00 BA03 BA62 DA01 DA02 5E062 FF01 5E346 AA12 AA15 BB01 CC17 DD02 DD13 DD34 EE24 EE25 EE29 FF18 GG06 GG08 GG09 HH33

Claims (1)

[Claims] 1. A green sheet forming step of forming a green sheet, a conductor forming step of forming a conductor, interposing the conductor between the green sheets, and temporarily compressing these to obtain a sheet-like integrated laminate. A temporary pressing step and a main pressing step of main pressing the sheet-like integrally laminated body subjected to the temporary pressing with a pressure larger than the pressure at the time of the temporary pressing, and performing the main pressing step a plurality of times. A method for manufacturing a laminated electronic component, characterized in that: