JPH0524642B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a laminated inductor, and particularly to a method for manufacturing a laminated inductor in which a magnetic layer and a conductive layer are laminated by a printing method. It is.

[Prior art and its problems]

The requirements for electronic components to be light, thin, and small are no exception, even for inductance elements such as high-frequency coils.
Multilayer inductors are being considered as one of the solutions.

In this method, a continuous conductor pattern is formed between magnetic layers of ferrite, and the conductor pattern is used to obtain an inductance similar to that of a coil. There is a method in which insulating sheets such as magnetic materials are stacked, and a method in which the insulating layer is also formed by printing. The present invention relates to a method of manufacturing a laminated inductor using a printing method.

In this method, a large number of insulating layers and conductive layers are usually printed at the same time, then divided into individual elements, and fired at a relatively high temperature. During firing, both the insulator and the conductor shrink, but the shrinkage rates are not the same. The contraction rate of insulators such as magnetic materials is greater than that of conductors.

This difference in shrinkage rate causes silver and the like in the conductor paste to diffuse into the insulating layer, lowering the insulation resistance and becoming a major cause of deterioration of characteristics. It is also one of the causes of delamination, which is the separation of layers.

〔the purpose〕

An object of the present invention is to solve the above-mentioned problems, obtain a magnetic layer with high insulation resistance, and obtain a laminated inductor with good characteristics.

It also prevents delamination and improves reliability.
The purpose is to obtain a laminated inductor with good yield.

[Means for Solving the Problems] The present invention achieves the above object by forming a hollow portion and guiding a conductor with a small shrinkage rate therein.

That is, in a method for manufacturing a laminated inductor that obtains a conductor pattern that continuously circulates inside an insulator while printing insulator layers and conductor layers alternately, a material layer adjacent to the conductor pattern that disappears during firing is
The feature is that printing is performed so that the periphery is surrounded by the insulating layer.

Thereby, a conductor such as a magnetic material that diffuses into the insulating layer is accommodated in this hollow portion.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention, showing the process of alternately printing insulating layers and conductive layers. A half-turn conductor pattern 11 is formed on a ferrite magnetic material 10a.
The magnetic material 10b covers the conductive pattern half a turn before, and a conductive pattern 11 extending to the top of the end thereof is formed. While the magnetic layers and conductor patterns are printed alternately in this manner, the ends of the conductor patterns are connected to each other, and an insulating layer is interposed between the conductor patterns forming each turn.

An organic pattern 12 is printed adjacent to the conductive pattern 11. This organic matter pattern 1
2 must be in contact with the conductor pattern 11 without fail. This organic pattern 12 is
In the next printing process, it is surrounded by an insulating layer and is formed so as not to be exposed on the end face of the element. If it is formed inside the conductor pattern 11, a conductor layer will be formed that crosses the magnetic path as an inductor, causing deterioration of characteristics. Therefore, it is necessary to form it on the outside, and it is particularly desirable to form it on the corners.

FIG. 2 is a front sectional view showing an embodiment of the present invention. An organic layer 22 is formed beside the conductor pattern 21 . Here, every 2 turns, the organic layer 2
2 is formed in order to prevent a short circuit from occurring due to the conductor accumulated in this portion. Therefore, it is desirable to shift the positions at which the organic layers are formed in each turn, but it is more efficient to form them alternately in opposite directions due to the relationship between masks and the like.

In manufacturing this type of inductor, a large number of elements are simultaneously printed and laminated, and after the lamination is completed, the elements are divided and fired. During firing, the organic matter disappears and this area becomes hollow. but,
Since this part is adjacent to the conductor layer, the conductor is guided and filled into this part. After firing, this part is no longer hollow, but is partially or completely filled with the conductor.

Note that the arrangement of the organic material layer is not limited to the above example, and may be in any position and shape. However, it is better to avoid shapes that cause short circuits or increase stray capacitance.

〔effect〕

According to the present invention, the difference in shrinkage rate is absorbed, and the conductor with a smaller shrinkage rate is guided to the cavity formed after the disappeared organic layer.

This can prevent the conductor, such as silver, from diffusing into the insulating layer and causing deterioration of characteristics.

Further, the occurrence of delamination can also be prevented.

For these reasons, a laminated inductor with excellent characteristics, reliability, yield, etc. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a front sectional view. 10... Magnetic layer, 11, 21... Conductor layer, 12,
22...Organic layer.

Claims (1)

[Claims] 1. In a method for manufacturing a laminated inductor that obtains a conductor pattern that continuously circulates inside an insulator while printing insulator layers and conductor layers alternately, a material layer adjacent to the conductor pattern that disappears during firing is removed so that the surrounding area is A method for manufacturing a laminated inductor, characterized in that it is printed so as to be surrounded by an insulator layer.