JPS61216314A - Method of trimming of laminated inductor - Google Patents

Abstract

PURPOSE:To enable to adjust on a large range the inductance of a laminated inductor with a 8-formed conductor pattern as well as to perform a trimming so that a fine adjustment can be conducted by a method wherein a recessed part such as a groove and the like is formed on the magnetic layer located on the upper and the lower end faces where a part of a magnetic circuit is formed. CONSTITUTION:A groove 14 which orthogonally crosses a magnetic circuit is formed at the center part of the magnetic layer 13 located on the upper end face of the laminated inductor. As the groove is to be formed in such a manner that it crosses the magnetic circuit, it is ordinarily formed on the upper and the lower parts of the crossing part of a conductor layer. Accordingly, the groove is provided almost in the center of the magnetic layer 13. Laser trimming is the suitable method for formation of said groove. However, other method such as a sand blasting and the like may be used. Also, a trimming can be performed on a mere recess, not a groove, in the same manner as above- mentioned.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for trimming a laminated inductor, and in particular, the present invention relates to a method for trimming a laminated inductor. The present invention relates to a method for trimming a laminated inductor in which a magnetic circuit is formed by a magnetic layer and magnetic layers on upper and lower end faces.

r Conventional technology and its problems] Due to the demand for smaller and thinner electronic devices, various electronic components are being made into chips, and there is also rapid movement in the field of inductors, where chipping has traditionally been slow. ing.

There are two ways to make inductors into chips: one is to miniaturize the ferrite core and wind it to form a coil, and form a current in the ferrite core. and a conductor layer are laminated to form electrodes on the end faces. The latter is called a laminated inductor.

A laminated inductor in which figure-8 conductor patterns are connected and laminated for the purpose of increasing inductance and decreasing line capacitance was developed in JP-A-59.
- Proposed in Publication No. 132604. As shown in FIG. 3, the conductor layers 31 are connected in a figure-eight shape through the magnetic layer 32 and stacked to form two coils.

It has a closed magnetic circuit structure in which a magnetic circuit is formed by the magnetic layer 32 around which the conductor layer 31 revolves and the magnetic material N33 on the upper and lower end surfaces.

Furthermore, since the inductance of a laminated inductor is fixed, it is necessary to adjust the inductance by trimming depending on the application. As such a trimming method, Japanese Patent Laid-Open No. 56-164509 has been proposed.

However, conventional trimming methods have a narrow adjustment range and are difficult to make fine adjustments.

Furthermore, the workability was also poor.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned problems and to trim the inductance of a laminated inductor equipped with the above-mentioned 8-shaped conductor pattern so that it can be adjusted over a wide range and also allows fine adjustment. shall be.

Another object of the present invention is to provide a trimming method that is easy to perform in one operation.

[Rounding method to solve problems] It accomplishes its purpose.

That is, in a method for trimming a laminated inductor in which a magnetic material and a conductive material are laminated, the 8-shaped conductive material is laminated and connected while intersecting through the magnetic material, and magnetic material layers are formed on the upper and lower end surfaces. , a recess is formed in the portion of the magnetic layer of the end face located above and below the intersection of the conductors, that is, in the center of the magnetic layer.

The nine recesses formed in this way cut the magnetic circuit formed within the magnetic body, thereby adjusting the inductance value of the laminated inductor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to one drawing.

FIG. 1 is a plan view showing an embodiment of the present invention, and FIGS. 2-2 are front views.

In this example, a groove 14 that crosses the magnetic circuit at right angles is formed in the center of the magnetic layer 13 on the upper end surface. Since the groove must be formed across the magnetic circuit, it is usually formed above or below the intersection of the conductor layer 11. Therefore, the magnetic layer 13 is provided at the center. Although it may be formed above and below,
From the viewpoint of ease of processing and strength, it is better to use only one side.

Laser trimming is suitable for forming grooves.

Other methods such as sandblasting may also be used. However, it is easier to control groove formation by racer trimming,
Therefore, inductance adjustment becomes easy.

In the examples shown in Figures 1 and 2, only one groove is formed at right angles, but trimming can be performed by arbitrarily selecting the number of grooves, width, depth, angle, or any combination thereof. . Furthermore, the grooves may not be formed across the entire magnetic body, but may be formed only in a part of the magnetic body. Moreover, even if it is not a groove but a mere recessed portion, trimming can be performed in the same manner.

Furthermore, since the amount of change in inductance varies depending on the position where the groove is formed, it is also possible to perform fine adjustment by forming the groove offset from the center.

The embodiments of the present invention are not limited to those described above, and K can also be applied to cases where a plurality of laminated inductors are successively trimmed.

〔Effect of the invention〕

According to the present invention, trimming can be performed only by forming grooves, so work efficiency is greatly improved.

The processing accuracy of the groove width, depth, etc. can also be improved to achieve desired values.

Furthermore, the adjustment range can be widened by changing the width, depth, number of grooves, angle, etc., and the depth of the grooves can thereby be made shallow, thereby maintaining mechanical strength.

Furthermore, there is an advantage that the inductance value can also be slightly adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is a perspective view of a part of a laminated inductor to which the present invention is applied.

Claims (1)

[Claims] In a method for trimming a laminated inductor in which a magnetic material and a conductive material are laminated, the 8-shaped conductive material is laminated and connected while intersecting through the magnetic material, and magnetic material layers are formed on the upper and lower end surfaces. 1. A method for trimming a laminated inductor, the method comprising forming a recess in at least one of the magnetic layers on the end face where the bodies intersect.