JP2002075768A - Manufacturing method of laminated inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drastically reduce man-hours in the manufacture of a laminated inductor. SOLUTION: After conductor films 13 and 14 for covering the end of an inner conductor pattern 12, exposed to the front and rear are formed on both surfaces, they are divided into elements for burning ceramic and printing a terminal electrode simultaneously. As needed, a conductor layer is loaded onto the terminal electrode by plating.

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 laminated inductor, and more particularly to a method for forming a terminal suitable for a laminated inductor having a structure in which a terminal of a conductor pattern orbiting in a laminating direction is drawn out in a laminating direction. .

[0002]

2. Description of the Related Art There is a growing demand for multilayer inductors as devices that meet the demand for miniaturization of electronic components. This forms a conductor pattern that circulates in a ceramic laminate, and both ends are drawn out to the outside and connected to terminal electrodes. Conventionally, a conductor pattern is generally pulled out in a direction perpendicular to the lamination direction. In general, the lamination is divided into elements after lamination, and after baking, a conductor film is applied and baked. In order to simultaneously perform firing and baking, a method of applying a conductor film before firing has been considered.

Recently, as shown in FIG. 3, a laminated inductor having terminals formed at both end surfaces in the laminating direction has been used. This type has an advantage that the winding of the coil formed by the conductor pattern has no directionality, so that mounting is easy.

[0004]

SUMMARY OF THE INVENTION The present invention facilitates the formation of the terminal electrodes of a laminated inductor having such terminals formed in the laminating direction, thereby greatly reducing the number of steps for forming the terminal electrodes. .

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by applying a conductor film to be a terminal electrode before cutting the laminate, and simultaneously firing the electrode at the time of firing after cutting. Is what you do.

That is, in a method of manufacturing a laminated inductor in which a conductor pattern whose ends are connected and circling is formed in a laminate and both ends are drawn out to the surface in the laminating direction and connected to a terminal electrode, an insulator paste and a conductor paste are provided. Are alternately printed to form a plurality of conductor patterns, each of which has an end connected in the laminate and circling, are integrally formed, and both ends of each conductor pattern are drawn out on both sides in the lamination direction, and the surface of the laminate in the lamination direction is formed. It is characterized in that a conductive paste is printed on almost the entire surface, the laminate is cut so that each element is divided, and the elements are fired and the terminal electrodes are fired.

[0007] A plurality of ceramic green sheets on which a conductor paste is printed are laminated, and a plurality of conductor patterns which are connected to each other and whose ends are connected in the laminate by conductors filled in the through holes are integrally formed. The same process can be applied to a method in which both ends are drawn to both sides in the laminating direction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The steps of the present invention are as follows. (1) Lamination of forming and laminating a conductor pattern on a sheet, and lamination of forming a conductor pattern in an insulator by alternately printing and laminating an insulating pair paste and a conductor paste (both ends of the conductor pattern are drawn out on both sides in the lamination direction) (2) Coating and drying the conductor film on the upper surface of the laminate (3) Turn the laminate over and apply the conductor film on the opposite surface,
Drying (3) Cutting into elements, splitting (4) Baking, baking terminal electrodes (5) Plating layer formation on terminals as necessary

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1A to 1D are perspective views showing an embodiment of the present invention. The steps of laminating a sheet or the like and the step of forming a conductor pattern are not shown.

The multilayer body 11 formed on the base 10 has a large number of conductor patterns formed therein, and these are superposed and circulated in the laminating direction to constitute a coil. Their ends 12
Is drawn out to the surface of the laminate 11 and is exposed. Of course, the same applies to the back surface (A).

A conductive paste such as silver is printed on the surface of the laminate 11 to form a conductive film 13. After printing, the conductive film 13 is dried (B).

The laminate 11 is turned over to expose the end of the conductor pattern on the back surface, and a conductor paste is similarly printed on the surface to form a conductor film 14. As a result, conductor films are formed on both surfaces of the laminate (C).

Next, the laminate 11 is cut along predetermined scribe lines 15 to separate the laminate into individual elements. As a result, a green body of a laminated inductor having a conductor pattern inside and a conductor film serving as an external electrode on an end face is obtained (D).

The green body obtained as described above is fired at a predetermined temperature to complete a laminated inductor. To improve the reliability of the terminal electrode, tin or solder plating 17 may be applied to the electrode 16 made of silver or the like. The step of applying the conductor is not required, and the conductor can be added only by ordinary barrel electrolytic plating.

[0015]

According to the present invention, in the manufacturing process of the laminated inductor, the process of applying the conductor paste to each element is not required, and the firing of the ceramic and the firing of the conductor film can be performed simultaneously. Man-hours for manufacturing can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing another embodiment of the present invention.

FIG. 3 is a front sectional view of a multilayer inductor to which the present invention is applied;

[Explanation of symbols]

 11: Laminated body 12: End of conductive pattern 13, 14: Conductive film 16: Terminal electrode 17: Plating layer

Claims (3)

[Claims] 1. A method for manufacturing a laminated inductor, comprising forming a conductor pattern having ends connected to a circuit in a laminate, and extending both ends to a surface in a laminating direction to connect to a terminal electrode. Are alternately printed to form a plurality of conductor patterns, each of which has an end connected in the laminate and circling, are integrally formed, and both ends of each conductor pattern are drawn out on both sides in the lamination direction, and the surface of the laminate in the lamination direction is formed. A method for manufacturing a multilayer inductor, comprising printing a conductive paste on substantially the entire surface, cutting the laminate so that each element is divided, firing those elements, and firing terminal electrodes. 2. A method for manufacturing a laminated inductor in which a conductor pattern whose ends are connected and circling is formed in a laminated body, and both ends of the conductor pattern are drawn out to a surface in a laminating direction and connected to a terminal electrode, the conductor paste is printed. Ceramic green sheets are laminated, and a plurality of conductor patterns that are connected and circumscribed in the laminate by conductors filled in through holes are integrally formed, and both ends of each conductor pattern are drawn out on both sides in the laminating direction, Conductive paste is printed on almost the entire surface of the laminate in the laminating direction, the laminate is cut so that each element is divided, and the elements are fired and the terminal electrodes are baked. Manufacturing method of multilayer inductor. 3. The method according to claim 1, wherein a solder plating layer is formed on the surface of the baked terminal electrode.