JPH09219332A - Manufacturing method of coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of coil components. SOLUTION: A plurality of through holes 2 penetrating from top to bottom sides, are formed in a layered ferrite 1, and electrode surfaces on the both sides of the layered ferrite 1 are formed by an electrode printing method and at the same time the through holes 2 are filled with electrodes. Dividing the layered ferrite into chips, including at least one hole, serves as a productive manufacturing method of coil components with both internal electrode and outer electrode. Variously shaped coil components are made by cutting and/or stamping out the ferrite layer.

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 coil component such as a chip inductor.

[0002]

2. Description of the Related Art Coil parts are widely used in various electronic devices, and in recent years, with increasing frequency and digitalization, they are increasingly used as noise countermeasure parts. As a conventional coil component satisfying these demands, there is a laminated coil obtained by alternately laminating ferrite magnetic layers and conductor layers (eg, Japanese Patent Publication No. 57-39521). In most of these coil components, an electrode pattern is printed on a green sheet and laminated to a predetermined thickness to produce a laminate, which is then produced by a method such as chipping, firing, external electrode coating, or baking. It was In such a chip manufacturing method, there are problems such as difficulty in positioning the electrode pattern during stacking and a large number of steps.
Further, regarding division, a method capable of coping with various chip shapes has been desired.

[0003]

As described above, in the case of the conventional manufacturing method, there are problems such as alignment of the electrode pattern during stacking and a large number of man-hours until the finished product, and the chip manufacturing method has high productivity. Was desired. Further, regarding chip formation, there is a limit to the chip shape that can be manufactured by the conventional Thomson cut method, and a method capable of coping with various shapes has also been desired. An object of the present invention is to provide an excellent method for manufacturing a coil component that solves these problems.

[0004]

In order to solve the above problems, according to the present invention, a through hole is formed in a ferrite laminate, and an electrode paste including this portion is printed on one surface from both the top and bottom of the laminate to form a through conductor. A method in which the internal conductor portion and the external electrode can be formed at the same time during printing by filling the holes with the electrode paste to form the chip internal conductor portion and further using the electrode layers formed on the upper and lower surfaces as the portions corresponding to the external electrodes. Devised. According to this method, the chip can be manufactured with a smaller number of steps. In addition to the conventional method of forming a square chip by Thomson cutting at a predetermined position when forming a chip, punching punching was used to make it possible to manufacture chips having various shapes by combining dies.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a step of forming a ferrite laminate, a step of forming a plurality of through holes penetrating the upper and lower surfaces of the ferrite laminate, and the ferrite laminate. Chips with excellent productivity are manufactured by a coil component manufacturing method that includes forming electrodes on both upper and lower surfaces of the body and filling the through holes with electrodes, and dividing the electrodes so as to include at least one through hole. It is possible.

According to the second aspect of the invention, the dividing means in the dividing method cuts with a cutting blade.
The cutting position can be adjusted by shifting the amount of the stage position for fixing the chip stack, and a rectangular chip of any size can be obtained.

According to the third aspect of the present invention, a punching jig is used as a dividing method. However, not only a cylindrical shape but also various shapes can be used depending on the displacement amount of the stage for fixing the chip laminated body and the shape of the punching jig. It is a method that makes it possible to manufacture chips with the dimensions and shapes described above.

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. 1 to 4 show a flow of a method for manufacturing a coil component according to the present invention.
First, a ferrite laminate 1 as shown in FIG. 1 is produced. Next, as shown in FIG.
Then, the through holes 2 are formed by the upper and lower punching jigs 5 using a puncher or the like. Next, as shown in FIG. 3, the electrode layer 3 is formed by screen printing or the like from the upper and lower surfaces of the ferrite laminate 1 having the through holes 2. At this time, the electrode layers are formed on the upper and lower surfaces, and the through holes 2 are printed and filled with the electrode paste from both surfaces, so that internal connection is performed. Finally, as shown in FIG. 4, predetermined positions of the chip laminated body are divided so as to include at least one through hole. Various methods such as slicer, laser, and Thomson can be considered as the dividing method. After being made into chips, it is baked at a predetermined temperature to obtain a finished product.

Next, the first embodiment will be described more specifically. Fe-Ni-Cu-Zn ferrite powder 100g
On the other hand, 8 g of butyral resin as a binder, 4 g of butylbenzyl phthalate as a plasticizer, and 20 g of each of butyl acetate and methyl ethyl ketone as a solvent were mixed and kneaded with a ball mill to prepare a ferrite slurry. Next, this slurry was formed on a PET film with a doctor blade so as to have a thickness of 0.2 mm. Ten sheets of this were transferred and laminated to complete the ferrite laminated body 1 of FIG. A heat press was used for the lamination, the transfer temperature was 100 ° C., the pressure was 100 kgf / cm ² , and the transfer lamination was performed while applying heat and pressure. Here, as for the formation of the laminated body, there is also a method of forming the laminated body at a constant thickness at once by thick film coating. Next, as shown in FIG. 2, the ferrite laminate 1 was punched out at predetermined positions by using a puncher with a cylindrical punching jig 5 to form a through hole 2. Next, a commercially available Ag electrode paste is used to screen-print one surface of the ferrite laminate 1 so as to cover the entire surface. At this time, the through hole is filled with the electrode paste from one side. Similarly, when the electrode paste is printed on the opposite surface as well, the through holes are completely filled with the electrode paste from both surfaces, and internal connection is performed. As described above, as shown in FIG. 3, a multi-chip stack 4 having a conductor layer inside the ferrite layer and having the electrode layers 3 corresponding to the external electrodes on the upper and lower surfaces is completed.

(Second Embodiment) Next, this chip laminated body 4
The chip dividing method will be described. FIG. 5 shows a method of manufacturing a large number of rectangular chips 8 of arbitrary size by adjusting the position of the stage 7 for fixing the chip stack 4 using the cutting blade 6. Further, in FIG. 6, the upper and lower punching jigs 5 such as a puncher are applied to accurately align the stage 7 and the chip laminated body 4, and then a predetermined position on a two-dimensional plane is punched out according to a program to divide the chips. went. In this case, depending on the combination of the punching jigs 5 to be used, chips of various shapes such as a polygonal shape as well as a cylindrical shape can be produced. The chip 8 thus obtained already has both internal conductors and external electrodes, and is finally fired to obtain a finished product. The firing temperature was around 900 ° C. for 2 hours.

[0011]

As described above, in the method of manufacturing the coil component of the present invention, the inner conductor of the through-hole is filled and formed at the same time as the electrode of the ferrite laminate is printed. Therefore, there is an advantage that an internal conductor can be formed at the time of printing an electrode, and the electrode layers formed on the upper and lower surfaces of the laminate can be external electrodes when formed into chips. For this reason, it is possible to eliminate the difficulty of positioning the electrode patterns, such as stacking green sheets on which conductor patterns are printed in advance, as in the conventional laminated coil component, and the large number of man-hours such as forming external electrodes after chip formation. From the above, the present invention can be said to be a method for producing chips with higher productivity.
Regarding the chip division of the laminated body, in addition to the conventional method of cutting Thomson blades, by adopting a punching method that applies a puncher, chips with various shapes as well as square shapes depending on the shape of the mold and the combination Can be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view schematically seeing through a first embodiment of the present invention.

FIG. 2 is a perspective view schematically seeing through the first embodiment of the present invention.

FIG. 3 is a perspective view schematically seeing through the first embodiment of the present invention.

FIG. 4 is a perspective view schematically seeing through the first embodiment of the present invention.

FIG. 5 is a perspective view schematically seeing through a second embodiment of the dividing means of the present invention.

FIG. 6 is a perspective view schematically seeing through a second embodiment of the dividing means of the present invention.

[Explanation of symbols]

 1 Ferrite Laminate 2 Through Hole 3 Electrode Layer 4 Chip Laminate 5 Punching Tool 6 Cutting Blade 7 Stage 8 Chip

Claims (3)

[Claims] 1. A step of forming a ferrite laminated body, a step of forming a plurality of through holes penetrating the upper and lower surfaces of the ferrite laminated body, and forming electrodes on the upper and lower surfaces of the ferrite laminated body at the same time as forming through holes. A method of manufacturing a coil component, which comprises a step of filling an electrode and a step of dividing the electrode part so as to include at least one through hole. 2. The method for manufacturing a coil component according to claim 1, wherein the dividing means in the dividing step is a cutting blade. 3. The method of manufacturing a coil component according to claim 1, wherein the dividing means in the dividing step is a punching jig.