JPH0574641A - Manufacture of glasses-type beads inductor - Google Patents

Abstract

PURPOSE:To obtain the manufacturing method of a glasses-type beads inductor wherein glasses-type beads cores and an inverse U-shaped conductor are combined more effectively than in the conventional manner, and a plurality of units can be assembled at the same time, so that manhour per unit can be reduced. CONSTITUTION:A plurality of glasses-type beads cores are so arranged at constant intervals that penetration holes are aligned on a line. Said cores are connected on the side surfaces by thin plate couplers 8, and turned into a multi- linkage core 4, which is molded as a unified body and sintered. A comb-type lead frame 5 constituted of a frame part 10 and lead terminal segments 9 is used. The lead terminal segments are inserted into the penetration holes 7, and the multi-linkage core 4 is combined with the comb-type lead frame 5. The core end surface is fixed to the lead frame part 10 by using adhesive agent. The thin plate couplers 8 and the frame part 10 are cut along the side surfaces of the glasses-type beads cores, and separated into a plurality of glasses-type beads inductors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an eyeglass-type bead inductor for preventing electromagnetic noise in a signal line connecting electronic devices to each other.

[0002]

2. Description of the Related Art A core made of a ferrite material and having an oval cross section and two through holes parallel to the axial direction is called an eyeglass type bead core. Reverse U to this glasses-type bead core
Both legs of the letter-shaped conductor are inserted into the through holes of the eyeglass-type bead core and combined to form a eyeglass-type bead inductor. The eyeglass-type bead inductor is inserted in series with a signal line connecting electronic devices to prevent electromagnetic induction noise superimposed on the signal line. Conventionally, as shown in FIG. 3, an eyeglass-type bead inductor is a combination of a single eyeglass-type bead core (hereinafter referred to as a core) 1 and a single inverted U-shaped conductor (hereinafter referred to as a conductor) 2 formed by molding an electric wire, An end face of the core 1 and a closed end of the conductor 2 are fixed to each other with an adhesive 3 or one side of a frame portion formed by punching out a strip-shaped conductor, and a set of two leads corresponding to the through holes of the bead core. It is made by inserting a single bead core into a comb-shaped lead frame in which terminal pieces are arranged at regular intervals in a comb tooth shape, and then cutting the frame part of the lead frame to separate it into a plurality of eyeglass-type bead inductors. Was there.

[0003]

In the conventional manufacturing method, when a single core and a single inverted U-shaped conductor are combined, the inverted U-shaped conductor is likely to be deformed, which may be difficult to combine. There is waste of work such as reworking of conductors and conductors, work efficiency is poor, and when combining a single core with a comb-shaped lead frame, the efficiency of combination work is relatively good, but if the core is small, the end face of the core is a frame Since it sometimes happens that the cores remain separated from each other, it is troublesome to insert the cores one by one until they come into contact with the frame part. It is an object of the present invention to provide a novel method of manufacturing an eyeglass-type bead inductor, which is more efficient than in the past and can combine a core and a conductor.

[0004]

[Means for Solving the Problems] A plurality of eyeglass-type bead cores are arranged at regular intervals so that the core end faces are in the same plane and the through holes of the cores are aligned, and the side faces of the cores are connected together. With a multiple core made by connecting together,
After combining these using a comb-shaped lead frame,
The connecting member and the frame portion of the lead frame are cut to divide into a plurality of eyeglass-type bead inductors.

That is, according to the present invention, a plurality of bead cores having two through-holes parallel to each other are arranged in a line at regular intervals so that the through-holes are in a straight line, and the bead cores are integrally formed on the side surface of the core at the connecting portion. , And a comb-shaped lead frame in which a pair of lead terminal pieces corresponding to the through holes of the bead core are provided in a long frame portion at the same intervals as the multiple core. After the lead terminal piece is inserted into the through hole of the multiple core to fix the core end face and the frame part together, the connecting part and the frame part are cut along the side surface of the core. A method for manufacturing an eyeglass-type bead inductor, wherein the eyeglass-type bead inductor is formed separately from a plurality of eyeglass-type bead inductors.

[0006]

In the multiple core, the lead terminal pieces of the lead frame are inserted all at once through the through holes to ensure the contact between the core end surface and the frame portion.

[0007]

Embodiments of the present invention will be described with reference to FIGS. 1 (a) and 1 (b). FIG. 1A shows a state before the multiple core 4 and the comb-shaped lead frame 5 are combined. The multiple core 4 has a glasses-shaped core portion (hereinafter referred to as a core portion) 6 having an oval cross section in a vertical direction and an axial direction in a vertical direction.
Plural pieces are arranged at the same intervals so that the major axis, which is a line connecting the centers of the individual through-holes 7, becomes a straight line (three in the figure, for example, if the core portion 6 has a major axis of 6 mm, a minor axis of 3 mm, and a length of 6 mm, then five) )
Are arranged side by side, and the outer peripheral surfaces of the ends of the long diameter are connected by a thin plate connecting portion 8 having the same length as the core portion 6, which is formed by integrally compacting with a ferrite material and then sintering.

The comb-shaped lead frame 5 is formed by punching out a band-shaped conductive material such as phosphor bronze having a spring property. A set of two lead terminal pieces 9 of a predetermined length corresponding to the through holes 7 of the core portion 6 extends at right angles to one side of the long frame portion 10 and a plurality of sets are provided at the same spacing as the spacing of the core portions 6. ing. As shown in FIG. 1A, the comb-shaped lead frame 5 vertically holds the lead terminal piece 9 and holds the multiple core 4 from above so that the lead terminal piece 9 is inserted into the through hole 7. The end surface of the core portion 6 is brought into contact with the frame portion 10.

Next, as shown in FIG. 1 (b), this temporary combination product is laid down sideways in the minor axis direction of the core portion 6 so that the lead terminal piece 9 is horizontal, and in FIG. 1 (b). The comb-shaped lead frame 5 is shown in a state of supporting the frame portion 10 and the free ends of the lead terminal pieces 9, but a small amount of adhesive 3 (not shown) is formed at the boundary between the central portion of the core portion 6 and the frame portion. ) Is injected to fix the core portion 6 to the frame portion 10.

The combination product of the comb-shaped lead frame 5 and the multiple cores 4 thus obtained is cut along both the connecting portion 8 and the frame portion 10 along the outer peripheral surface of the core portion 6, as shown in FIG. Separated into a plurality of single eyeglass-type bead inductors by the manufacturing method of the present invention in which the connecting portion is almost removed.

In the multiple core 4, the core portion 6 does not have to be limited to an elliptical cross section, and the connecting portion 8 may be a thin plate and is not limited to one piece. For example, the core portion has a rectangular cross section, and the connecting portion is May be two thin plates parallel to the side faces of the long sides of the core, and may be set so that powder compacting and cutting are easy and deformation in the direction in which the core portions are continuous is small.

[0012]

According to the present invention, the multiple cores are extremely easy to handle as compared with a single bead core, are more efficient than the conventional ones, and a large number of them can be assembled at one time, and the number of steps per one can be reduced. Therefore, there is an effect that it is possible to provide an inexpensive bead inductor having good quality.

[Brief description of drawings]

1A and 1B are views showing a method of manufacturing an eyeglass-type bead inductor according to the present invention, wherein FIG. 1A is an external perspective view showing a state before assembly, and FIG. 1B is an external perspective view showing a temporary assembly. Fig.

FIG. 2 is an external perspective view showing a completed eyeglass-type bead inductor according to the method of the present invention.

FIG. 3 is an external perspective view showing a conventional eyeglass-type bead inductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glasses type bead core 2 Inverted U-shaped conductor 3 Adhesive 4 Multiple cores 5 Comb-shaped lead frame 6 Glasses type core part 7 Through hole 8 Connecting part 9 Lead terminal piece 10 Frame part

Claims (1)

[Claims] 1. A plurality of bead cores having two mutually parallel through-holes are arranged in a row at regular intervals so that the through-holes are in a straight line, and are integrally connected to each other on the core side surface at a connecting portion. A continuous core and a comb-shaped lead frame in which a pair of lead terminal pieces corresponding to the through holes of the bead core are provided in a long frame portion at the same intervals as the multiple core are used. After inserting the lead terminal piece into the through hole of the multiple core and fixing and combining the core end surface and the frame portion, the connecting portion and the frame portion are cut along the side surface of the core, A method of manufacturing an eyeglass-type bead inductor, characterized in that the eyeglass-type bead inductor is formed separately.