JPH0437102A - Ferrite core - Google Patents

Abstract

PURPOSE:To obtain a CI type ferrite core having characteristic adjusting function by forming a recess of a C type ferrite core to be inserted with an I type ferrite core. CONSTITUTION:In a ferrite core composed by inserting an I type ferrite core 2 in a C type ferrite core 1, a recess 3 is formed on a surface of the core 1 to be inserted with the core 2. For example, the width of the recess 3 is about a radius of the core 2, and a gap amount can be varied by altering the position of the core 2 inserted in the core 1. Thus, in a CI type ferrite core, its inductance value can be easily varied, variations in the inductance value due to a deformation at the time of baking the ferrite core can be adjusted, a stable production can be performed, and an arbitrary inductance value can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inductance element using a C-type core and an I-type core.

(Prior Art) FIG. 6 shows a CI-type ferrite core using a conventional C-type ferrite core and a ■-type ferrite core.

This conventional example is constructed by inserting a type 1 ferrite magnetic core 52 into a C-type ferrite magnetic core 51, and a coil 53 is wound around the ■-type ferrite magnetic core 52.

Conventional CI-type ferrite cores require a clearance between the C-type ferrite core and ■-type ferrite core so that the type 1 ferrite core can be inserted into the C-type ferrite core, and the structure usually has a gap. .

(Problems to be Solved by the Invention) Ferrite magnetic cores generally undergo deformation during the firing process in their manufacturing process, making it difficult to obtain a ferrite magnetic core with high dimensional accuracy. In order to obtain this, it was necessary to process it after firing. This C-type ferrite magnetic core also undergoes deformation, particularly in the 5 dimensions shown in FIG. 7, which causes the inductance of the constructed inductance element to vary, making it impossible to obtain an inductance element with stable characteristics.

In addition, in order to solve the above problems, the five dimensions of the C-type ferrite magnetic core may be processed to have predetermined dimensions.
Although it is conceivable to process the length of the type 1 ferrite magnetic core so as to correspond to the five varying dimensions, both methods have the problem of increasing the number of man-hours and increasing the cost.

In view of the above, an object of the present invention is to provide a CI-type rougherite magnetic core having a characteristic adjustment function.

(Means for Solving the Problems) The present invention provides a ferrite magnetic core configured by inserting a type 1 ferrite core into a type C ferrite core.
A recess is formed on the surface of the I-type ferrite core into which the I-type ferrite core is inserted.

Further, in the present invention, in a ferrite magnetic core constructed by inserting a ■-type ferrite magnetic core into a C-type ferrite magnetic core, at least one end surface in the axial direction of the type-1 ferrite magnetic core is tapered.

Further, the present invention provides a ferrite core configured by inserting a type 1 ferrite core into a C type ferrite core, in which a step portion is formed on at least one end surface in the axial direction of the type 1 ferrite core.

Further, the present invention provides a ferrite magnetic core configured by inserting a type 1 ferrite magnetic core into a C-type ferrite magnetic core, by changing the position of the type 1 ferrite magnetic core inserted into the C-type ferrite magnetic core. This allows the amount to be varied.

(Example) A front view of an embodiment according to the present invention is shown in FIG.

Further, an exploded perspective view of this embodiment is shown in FIG. FIG. 3 shows a top plan view (a) and a front view (b) of a bobbin used in this embodiment.
It is composed of a type ferrite magnetic core 2. The type 1 ferrite magnetic core 2 is completely inserted into the C type ferrite magnetic core 1. And C type ferrite magnetic core 1
A recess 3 is formed in the surface into which the I-type ferrite magnetic core 2 is inserted. The width of this recess is approximately the radius of the type 1 ferrite magnetic core 2. This type 1 ferrite magnetic core 2
was inserted into the through hole 5 of the bobbin 4 provided with the winding 6, and the C-type ferrite magnetic core 1 was inserted from the left side of FIG. 3 to form a coil component. At the end of the through hole 5 of the bobbin 4, a projection 7 is provided to prevent the type 1 ferrite magnetic core 2 from falling out.
is formed.

In this example, Table 1 shows the L values when the 3IC type ferrite magnetic core 1 is arranged as shown in FIG. 1 and when the 3IC type ferrite magnetic core 1 is moved in the direction of the arrow X in FIG.

Table 1 This value is when the number of windings is 55.5 turns, the frequency is 1 kHz, Ll is the depth of the recess 3, 1 m, and L is the depth of the recess 3, 2Ilo.

Moreover, a type 1 ferrite magnetic core 8 shown in FIG. 4 was used instead of the type 1 ferrite magnetic core 2 of the above embodiment. This ■-type ferrite magnetic core 8 has a tapered end surface 9 in the # direction. The height difference of this taper part is 0.5m, 1m,
2■, and when the direction of the tapered part is changed (the direction shown in Fig. 4, the direction rotated 90 degrees in Fig. 4, the direction rotated 180 degrees in Fig. 4), the change in the L value is the above L If □, 1
It was possible to change it from 39.9 μH to 171.7 μH, and in the case of L2, it was possible to change it from 130.7 μH to 164°0 μH.

Further, as another example, as shown in FIG. 5, a type 1 ferrite magnetic core 10 having a stepped portion 11 formed on one end surface was used. This type 1 ferrite magnetic core 1
When the step size of 0 is 0.5 m, 1■, 2■ and the direction of this step is changed (the direction shown in Fig. 5, the direction rotated 90 degrees in Fig. 5).

In the case of L1, the L value can be changed from 152.1 μH to 177°9 μH, and in the case of L, the L value can be changed from 139.5 μH to 1
It was possible to change it up to 70.4 μH.

(Effects of the Invention) According to the present invention, it is possible to easily change the inductance value in a CIl type ferrite magnetic core, and it is possible to adjust fluctuations in the inductance value due to deformation during firing of the ferrite magnetic core, resulting in stable In addition, it is possible to obtain a desired inductance value.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment according to the present invention, and FIG.
The figure is an exploded perspective view of FIG. 1, FIG. 3 is a top plan view (a) and a front view (b) of a bobbin used in an embodiment of the present invention, and FIG. 1 of the second embodiment according to the present invention
FIG. 5 is a front view of an L-type ferrite magnetic core according to a third embodiment of the present invention;
FIG. 6 is a front view of a conventional example, and FIG. 7 is a front view of a C-type ferrite magnetic core of the conventional example. DESCRIPTION OF SYMBOLS 1... C type ferrite magnetic core, 2, 8.10... L type ferrite magnetic core, 3... Recessed part, 4... Bobbin, 5...
...Through hole, 6...Winding, 7...Protrusion, 9...
Part of the taper, 11... step part. Figure 1 Figure 3 (b) Figure 2 Figure 4 q Figure 5 Figure 7 Contents of amendment 1: Insert the following between lines 11 and 12 on page 7 of the specification. . "Furthermore, a front view of another embodiment according to the present invention is shown in FIG. 8. An exploded perspective view of this embodiment is shown in FIG. 9. A tapered recess 23 is formed as a recess formed in the surface into which the magnetic core 22 is inserted.With this tapered recess 23, this embodiment also has the ability to
The inductance value can be adjusted. 2. "J" in the 8th line of page 8 of the specification is amended to the following. Figure 9 is an exploded perspective view of Figure 8.'' 3. Add attached Figures 8 and 9. Procedural amendment (0 button November 27, 1990). Display of the case 1990 2゜ Title of the invention 3, Person making the amendment Relationship to the case Patent application No. Ferrite magnetic core

Claims (4)

[Claims] 1. A ferrite magnetic core configured by inserting an I-type ferrite magnetic core into a C-type ferrite magnetic core, characterized in that a recess is formed on a surface of the C-type ferrite magnetic core into which the I-type ferrite magnetic core is inserted. . 2. A ferrite magnetic core constructed by inserting an I-type ferrite magnetic core into a C-type ferrite magnetic core, wherein at least one end surface in the axial direction of the I-type ferrite magnetic core is tapered. 3. A ferrite magnetic core configured by inserting an I-type ferrite magnetic core into a C-type ferrite magnetic core, characterized in that a step portion is formed on at least one end surface in the axial direction of the I-type ferrite magnetic core. 4. In a ferrite magnetic core configured by inserting an I-type ferrite magnetic core into a C-type ferrite magnetic core, a structure in which the gap amount can be varied by changing the position of the I-type ferrite magnetic core inserted into the C-type ferrite magnetic core. A ferrite magnetic core characterized by the following.