JPH0614430Y2 - Bead type magnetic core assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bead-shaped magnetic core assembly through which lead wires of electronic parts and the like are inserted.

(Prior Art) In recent years, since the performance of electronic devices has increased, noise that enters or is emitted into electronic devices has become a problem, and it has been desired to remove the noise.

Conventionally, as one of means for removing noise, for example, a method of inserting a lead wire of an electronic component into a bead type ferrite core having a through hole has been performed.

As shown in FIGS. 8 and 9, a conventional bead-shaped magnetic core assembly includes a resin case a, a plurality of bead-shaped ferrite cores c each having a through hole b, and a resin lid case d. The resin case a is formed with a plurality of recesses e in rows in which the bead-shaped ferrite cores c are inserted. The bottom surface of the recesses e is a small-diameter through hole through which a lead wire (not shown) is inserted. f is provided. Further, a plurality of recesses g into which the upper ends of the plurality of bead-shaped ferrite cores c are fitted are formed on one surface of the lid case d, and a small-diameter through hole h through which a lead wire is inserted is formed on the bottom surface of the recesses g. It is provided.

As shown in FIG. 10, the bead-shaped magnetic core assembly i has a plurality of electronic parts such as ICj in the through hole h of the lid case d, the through hole b of the bead type ferrite core c, and the through hole f of the case a. The lead terminal k is inserted, and the printed circuit board l
Mounted on.

(Problems to be Solved by the Invention) In the above-mentioned bead-shaped magnetic core assembly, the thickness between the bottom surface of the resin case a and the bottom surface of the recess e, and the top surface of the lid case d and the recess g.
The height of the bead-shaped ferrite core c is higher than the height of the bead-shaped ferrite core c by the total thickness between the bottom surfaces of the above, which poses a problem of hindering miniaturization of electronic devices.

An object of the present invention is to provide a bead-shaped magnetic core assembly having a low height.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a plurality of bead-shaped magnetic cores having through holes for inserting lead wires so that axes of the bead-shaped magnetic cores are parallel to each other. In the bead-shaped magnetic core assembly which is arranged in such a manner as to be fixed by an insulator, the bead-shaped magnetic core has a diameter at both ends in the longitudinal direction smaller than the diameter of the central part, or the bead-shaped magnetic core is in the longitudinal direction. The diameter of both ends is larger than the diameter of the central part,
The bead-shaped magnetic core is characterized in that it is fixed by exposing and embedding only both end faces of both end portions in the longitudinal direction of the insulating resin molded body.

(Function) A bead-shaped magnetic core having a through hole for inserting a lead wire, in which the diameter of both longitudinal end portions is smaller than the diameter of the central portion, or the longitudinal end portions of the magnetic core are larger than the central portion in diameter. Since the beads-shaped magnetic cores were arranged so that their axes are parallel to each other and embedded and fixed in an insulating resin molding, if the outer peripheral surface of the beads-shaped magnetic core is in the resin, use a lid or the like. It does not fall off the insulator without holding the bead-shaped magnetic core. Therefore, both end faces of both end portions in the longitudinal direction of the bead-shaped magnetic core can be exposed from the insulating resin molded body, and the thickness of the bead-shaped magnetic core assembly can be reduced.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a bead-shaped ferrite core having a through hole 2, and a concave portion 3 is formed in the central portion of the outer peripheral surface of the core 1 so as to extend over the entire circumference. The diameter is larger than the diameter of the central portion. The plurality of cores 1 are arranged in a row and embedded in an insulating resin molded body 4 made of, for example, an epoxy resin so that both end surfaces thereof are exposed. The molded body 4 is prevented from slipping out.

The bead-shaped ferrite core 1 is made of an insulating resin molding 4
In order to prevent the escape from the
For example, a circular recess 3A may be formed on the peripheral surface of the core 1, and the number may be plural.

The bead type ferrite core 1 shown in FIG. 1 to FIG.
Both end faces are formed flat over the entire surface,
As shown in FIGS. 4 and 5, tapered portions 5 are formed at both ends of the bead-shaped ferrite core 3 in the longitudinal direction, and the diameter of both ends is made smaller than the diameter of the central portion. A bead-shaped magnetic core assembly was constructed by exposing and embedding and fixing only both end faces of the insulating resin molded body 4. In this case, the concave portion 3,
Even if 3A is not formed, the core 1 does not come out of the molded body 4.

FIGS. 6 and 7 show modified examples of those shown in FIGS. 4 and 5, respectively, and the one shown in FIG. 6 has four bead-shaped ferrite cores 1 arranged so as to form a quadrangle. In the seventh example, three bead-shaped ferrite cores 1 are arranged so as to form a triangle.

(Advantages of the Invention) Since the present invention is configured as described above, the bead-shaped magnetic core assembly is insulated even if both end faces of the bead-shaped magnetic core in the longitudinal direction are exposed. Since it does not come out of the resin molded body, there is no need for an extra thickness to hold the bead-shaped magnetic core, and the thickness of the bead-shaped magnetic core assembly should be equal to the longitudinal length of the bead-shaped magnetic core. If a bead-shaped core is attached to a lead wire or the like of an electronic component, it has an effect of contributing to downsizing of electronic equipment.

[Brief description of drawings]

1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a perspective view of another example of the bead type ferrite core. 5 and 5 are perspective views of another embodiment of the present invention and sectional views taken along the line VV of FIG.
FIG. 7 and FIG. 7 are perspective views of modified examples of those shown in FIGS. 4 and 5, respectively, and FIGS. 8 and 9 are perspective views of a conventional example and a sectional view taken along the line IX-IX of FIG. FIG. 10 is a perspective view showing an example of use of the bead-shaped magnetic core assembly. 1 ... Bead type ferrite core, 2 ... through hole, 4 ...
Insulating resin molding

Claims (2)

[Scope of utility model registration request] 1. A bead-shaped magnetic core assembly in which a plurality of bead-shaped magnetic cores each having a through hole for inserting a lead wire are arranged such that axes of the bead-shaped magnetic cores are parallel to each other and fixed by an insulator. The bead-shaped magnetic core has a diameter at both longitudinal end portions smaller than the diameter at the central portion, and the bead-shaped magnetic core exposes only both end surfaces of the longitudinal end portions in the insulating resin molded body. A bead-shaped magnetic core assembly characterized by being embedded and fixed. 2. A bead-shaped magnetic core assembly in which a plurality of bead-shaped magnetic cores each having a through hole for inserting a lead wire are arranged so that axes of the bead-shaped magnetic cores are parallel to each other and fixed by an insulator. The bead-shaped magnetic core has a diameter at both ends in the longitudinal direction larger than the diameter at the central portion, and the bead-shaped magnetic core exposes only both end faces in the longitudinal direction in the insulating resin molded body. A bead-shaped magnetic core assembly characterized by being embedded and fixed.