JPH02146707A - Inductance element - Google Patents

Abstract

PURPOSE:To obtain a structure which makes electrical characteristics such as inductance and the like stable without using parts and adhesives which are exclusively prepared in order to fix divided cores by causing elastic sidewalls which rise from two side end edges of a base plate that are facing each other and then bend inwards to be formed so that each longitudinal sectional form of the elastic sidewalls is tilted inwards. CONSTITUTION:An inductance element 10 is composed of: a quadrangle base plate 14; sidewalls 16 which rise from two side end edges of the base plate 14 that are facing each other and are formed by bending sidewards; divided cores 24 which are pushed and pressed by the sidewalls; coils 26 which are wound to the divided core 24. In such a case, respective sidewalls 16 are formed so that each longitudinal sectional form is tilted inwards. For example, the base plate 14 and the sidewalls 16 are formed on the base 12. Notches 20 are formed at a side end edge where the sidewalls 16 of the base plate 14 are not formed. In this way, this element is equipped not only with notches 20 to which terminals 30 of the coils 26 are disposed but also with a cover 34 so that it is fitted into the base 12 and the terminals 30 of the coils 26 are bound to the notches 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inductance element, and particularly to an inductance element in which a split core is pressed and held from both sides by side walls rising from a bottom plate, for example.

[Prior art]

An example of this type of inductance element is disclosed in, for example, Utility Model Application No. 107537/1983 (Kokai No. 17111/1983). This conventional inductance element 1 is
As shown in FIG. 4, it includes a case 2 made of an elastic material such as synthetic resin, and a split core 4 is arranged on the bottom plate 3 of the case 2, and a coil 5 is attached to the legs of the split core 4. has been done. The terminal 6 of the coil 5 is inserted into the hole 7 of the bottom plate 3 and pulled out below the case 2. The side wall 8 of the case 2 has a cross-sectional shape curved inward, thereby sandwiching the split core 4 from both sides.

This conventional technique has the advantage that there is no need to use special parts or adhesives for fixing the split cores 4.

[Problem to be solved by the invention]

However, in the conventional inductance element 1, when the case 2 is manufactured, the distance A between the opposing side walls 8 varies due to so-called "sink marks", so the force that presses the split core 4 is not stable, and as a result, the inductance etc. There was a problem in that the electrical characteristics of the device also became unstable.

Therefore, the main object of the present invention is to provide an inductance element whose electrical characteristics such as inductance are stabilized without using special parts or adhesives for fixing the split cores.

[Means to solve the problem]

This invention provides a rectangular bottom plate, elastic side walls rising from two opposing side edges of the bottom plate and curved inward, a split core pressed by the side walls, and a split core. The present invention is an inductance element including a coil wound around the coil, characterized in that each side wall is formed such that its longitudinal cross-sectional shape is inclined inward.

[Effect]

A split core is placed on the bottom plate. At this time, since the two side walls are formed in a unique shape such that the vertical cross-sectional shape is inclined inward, the split core is pressed and held from both sides by the elasticity of the side walls. Therefore, the split cores are held integrally on the bottom plate.

〔Effect of the invention〕

According to this invention, since the side wall has a shape that is not easily affected by "sink marks" during manufacturing, dimensional accuracy is improved compared to the conventional technology, and the force with which the side wall presses the split core is stable. As a result, electrical characteristics such as inductance are also stabilized.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

Referring to FIGS. 1 to 3, an inductance element 10 of this embodiment includes a base 12 formed by molding an elastic material such as synthetic resin. The base 12 includes a bottom plate 14, and side walls 16 are formed that stand up from a pair of opposing side edges of the bottom plate 14 to press split cores 24, which will be described later. These side walls 16 are
As can be clearly seen in particular from FIG. 2(A), the longitudinal cross-sectional shape of each is inwardly curved. That is, the vertical cross-sectional shape of the side wall 16 is formed, for example, in the shape of a "<" character. At this time, the distance L between the portions of the side walls 16 that contact the split cores 24 placed on the bottom plate 14 (FIG. 2(A)) is as follows:
It is designed to be slightly smaller than the length in the extending direction of the legs of the assembled split core 24, so that the split core 24 can be sufficiently pressed or clamped. Split core 24
If the only purpose is to obtain a pressing force of
The reason why the side wall 1G is folded back into a "<" shape and the upper part of the side wall 1G is inclined outward is to facilitate storage of the split core 24.

A slit 18 extending in the vertical direction is formed at the center of each side wall 16 in the lateral direction, making it possible to insert a jig 28 sandwiching the split core 24 and to attach a presser spring 32.

Moreover, notches 20 are formed in the two side edges of the bottom plate 14 where the side walls 16 are not formed, in which the terminals 30 of the coil 26 are placed. A positioning plate 22 is formed standing up in the center of the bottom plate 14 and extending in a direction perpendicular to the side wall 16. This positioning plate 22 has a function of ensuring insulation between the two coils 26 attached to the split core 24.

Then, with the coil 26 fitted into each leg of the split core 24 consisting of two "U" shaped cores, the split core 24 is held between both sides by a jig 28, and the split core 24 is
is placed on the bottom plate 14 of the base 12. Therefore, the split core 24 is pressed from both sides by the elasticity of the side wall 16,
They are held fixed in one direction. In this way, the split core 24 can be inserted and placed on the base 12 while being held between the jigs 28, so the assembly work is easy.

The terminal 30 of the coil 26 is connected to the base 1 by rotating the coil 26 in the direction indicated by arrow A in FIG.
It is fitted into the notch 20 from the open end of 2. Therefore, 1. Positioning of the terminals 30 of the coil 26 is easier than in the conventional case where the terminals are inserted into or penetrated through holes in the bottom plate. For example, this method is particularly applicable when the winding material is configured as the terminal 30 as is, such as in an air-core coil, or when the coil 26 is not fixed between the coil 26 and the split core 24 and the coil 26 can freely rotate. is valid. That is, after the split core 24 is fixed as described above, the terminal 30 can be pulled out by simply rotating the coil 26 in the direction of the arrow.

Then, a substantially U-shaped presser spring 32 is fitted from above the split core 24 so as to sandwich the split core 24 from both sides. Thereby, the integral fixation of the split cores 24 can be stably maintained. At this time, it goes without saying that the position where the presser spring 32 is fitted is the position corresponding to the slit 1B.

Then, a cover 34 with an opening at the bottom is placed over the base 12. This cover 34 includes a ceiling plate 36 whose size is slightly larger than the bottom plate 14 and four side walls 38, and a pair of opposing side walls have slits 40 at positions corresponding to the presser springs 32.
is formed. By covering the base 12 with such a cover 34, as can be clearly seen from FIG.
Terminals 30 of coil 26 are constrained within cutouts 20 in bottom plate 14 . Therefore, in this state, the coil 26 can no longer be rotated, and therefore the coil 26 is fixed.

Note that the positioning member 22 and the pressing spring 32 are not necessarily necessary, and the cover 34 may have a U-shaped cross section with a side wall large enough to cover the notch 20.

Furthermore, the number and shape of the split core 24 and coils 26 are not limited to those in the embodiments; for example, two or more coils may be attached to one leg of the split core 24, or one coil may
Various modifications are possible, such as using only one core or using an E-shaped core as a split core.

Furthermore, in the above embodiment, if the winding directions of the two coils 26 are reversed, a "common mode choke coil" is obtained. At this time, depending on the winding direction of the coil 26, the coil 2
By applying different colors to coil 26 (for example, red on the - side and green on the other side), you can know the winding direction of the coil 26 just by identifying the color, and you can avoid incorrectly installing a common mode choke coil like this. can be reduced as much as possible.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. Figure 2 is an illustrative view showing the base of the embodiment in Figure 1, with Figure 2 (A) being a front view, Figure 2 (B) being a side view, and Figure 2 (
C) is a top view. FIG. 3 is a bottom view showing the completed product of the embodiment shown in FIG. FIG. 4 is an exploded perspective view showing the prior art. In the figure, IO is an inductance element, 12 is a base, 14 is a bottom plate, 16.38 is a side wall, 18 is a slit, 2
0 is a notch, 24 is a divided core, 26 is a coil, 30 is a terminal, and 34 is a cover. Patent Applicant Murata Manufacturing Co., Ltd. Representative Patent Attorney Yama 1) Yoshihito Diagram

Claims (1)

[Scope of Claims] 1. A rectangular bottom plate, elastic side walls rising from two opposing side edges of the bottom plate and curved inward, and a division pressed by the side walls. An inductance element including a core and a coil wound around the split core, wherein each of the side walls is formed such that a longitudinal cross-sectional shape thereof is inclined inward. 2. The bottom plate and the side wall are formed on the base, and a notch is formed on the side edge of the bottom plate of the base where the side wall is not formed and for arranging the terminal of the coil there, and a notch is fitted into the base. 2. The inductance element according to claim 1, further comprising a cover that restrains the terminal of the coil in the notch. 3. The inductance element according to claim 1 or 2, comprising a slit formed in the longitudinal center of each of the two side walls.