JPS61283206A - Manufacture of bead filter device - Google Patents

Abstract

PURPOSE:To reduce the assembling time by arranging ferrite beads altogether on a pedestal and using a lead frame with ease of handling. CONSTITUTION:The ferrite beads 2 are inserted in a recess 11 of the pedestal 11 and after both legs 33 of the lead frame 3 are inserted through the center hole of the ferrite beads 2 and the center small through hole 12 until the band conductor 31 is pressed into contact with the upper face of the insulated pedestal 1, a jig (not shown in figure) is pressed simultaneously in seven square recesses 13 and a center connection conductor 32 is cut off at the center. Then a tongue- shaped conductor 32 is folded to the inside along the upper ridge of the square recess 13 so as to be adhered closely to the inner wall of the square recess 13, eight strip conductors 31 are fitted independently to the pedestal 1 to form the bead filter. A notch 34 is formed to the center of the center connection conductor 32 from both sides to narrow and the tip blade of the pressing jig is pressed into contact with the narrowed part.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of manufacturing a bead filter by passing a signal line through a through hole of a magnetic material such as a ferrite bead. The present invention relates to a method of manufacturing a bead filter device in which bead filters are all arranged on one pedestal so as to be suitable for mounting a substrate, etc.

[Conventional technology]

Digitization of signals processed by electronic equipment.

As speed increases, electromagnetic noise generated by electronic devices can propagate to other electronic devices via signal lines and power lines, interfering with their operation, or conversely, electromagnetic noise generated by other electronic devices can interfere with signals. Problems have arisen in which electronic equipment flows into the electronic equipment through power cables and power lines, and is adversely affected. One of the countermeasures against these noises has recently been a method of using a filter, a so-called bead filter, in which a signal line is passed through a magnetic material such as a ferrite bead having a through-hole.

By the way, in the method of manufacturing a bead filter by immediately passing signal lines on a printed circuit board through the through holes of ferrite beads, the manufacturing work is not easy because there are many signal lines and the ferrite beads are small.

Therefore, conventionally, a bead filter device has been proposed in which a bead filter is housed in a container with the same terminal arrangement as a general integrated circuit package. The filter device is manufactured by connecting the inner protruding end of the external connection terminal of the terminal-equipped container (=an electric wire inserted through a through-hole of a ferrite bead by soldering) and fixing it with an adhesive or the like.

[Problem that the invention seeks to solve]

This manufacturing method has the disadvantage that one assembly operation is complicated and takes a long time, and automation of the operation is difficult.

[Means for solving problems]

In the present invention, a plurality of magnetic bodies having nine through holes, a pedestal made of an insulating material, and a flat lead frame are prepared as one component. The pedestal has first recesses of the same number as the number of magnetic bodies provided along the opposing side wall at predetermined intervals so that the magnetic bodies can fit therein, and a center penetrating hole provided at the bottom of the first four parts. It has a small hole and a second recess provided on the upper surface at positions equidistant from the first recesses adjacent to each other. The lead frame includes a central connecting conductor portion having a length approximately equal to the distance between the opposing end walls of the pedestal, and a central connecting conductor portion extending from the central connecting conductor portion to both sides in a direction orthogonal to the length direction of the pedestal. the central through-holes provided at the bottom of the first four parts, arranged at substantially equal intervals to the intervals between the first recesses adjacent to each other along the opposing side walls of the upper surface, and having at least a width on the tip end side; and a band-shaped conductor portion having a diameter equal to or less than the diameter of the through-hole of the magnetic material.

In the present invention, the magnetic material is attached to the first portion of the pedestal, respectively.
and inserting the through hole into the four parts of the pedestal so that it is visible from the top and bottom sides of the pedestal.

- bending the band-shaped conductor portion of the lead frame at right angles to the same side at a position approximately equal to the interval between the first recesses facing each other along the end wall direction of the pedestal to form both leg portions; The formed legs are inserted through the through-hole of the magnetic body and the central small through-hole provided at the bottom of the first recess, and the tips thereof are made to come out from the bottom of the pedestal. , a step of inserting the lead frame excluding both legs until it comes into contact with the top surface of the pedestal;
・A step of cutting the central connecting conductor of the lead frame at approximately the middle position between the strip-shaped conductor portions adjacent to each other in the length direction to form a tongue portion, and the formed tongue portion, and bending the second recess inward along the upper edge of the second recess.

[For production]

Pass both legs of the strip-shaped conductor part of the rib-like lead frame through the through-hole of the magnetic material fitted into the first recess of the pedestal, cut the central connecting conductor part of the lead frame at a predetermined position, and insert it into the second recess. By folding it, it can be divided into a plurality of bead filters and attached to a pedestal, and the ends of the two legs protrude from the bottom of the pedestal, allowing them to be easily mounted on a printed circuit board as external connection terminals.

〔Example〕

Hereinafter, two embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is an external perspective view showing the structure of an embodiment of a bead filter device manufactured according to the present invention, and Fig. 2 is an exploded perspective view of Fig. 1 showing the structure of parts constituting Fig. 1. be. In fig.

1 is a rectangular base made of an insulating material, 2 is a ferrite bead as a magnetic material having a through hole, and 3 is a lead frame.

The pedestal 1 is provided with eight recesses 11 on each side at regular intervals along both long side walls (for example, so that the axis of the recesses 11 is in the same arrangement as the terminal arrangement of the integrated circuit package). A small central through hole 12 (partially shown as transparent in FIG. 2) is vertically provided at the bottom of the tube. Recess 1
1 is a required depth dimension larger than the height of the ferrite bead 2. Further, on the upper surface of the pedestal 1, there are rectangular recesses 13 (
(7 in the figure) are drilled. The depth dimension of the rectangular recess 13 is set to be more than half the length of the upper edge of the rectangular recess 13 in the direction parallel to the long side of the pedestal 1.

The lead frame 3 has a rib-like shape in which a pattern of band-shaped conductors 31 of a predetermined length with wide portions at two middle locations are formed at regular intervals, and the conductors 31 are connected to each other by a central connecting conductor 32 at the center. , phosphor bronze or beryllium copper, etc. elasticity.

In the case of two cases where a highly electrically conductive metal plate is used and created by punching or chemical etching, as shown in FIG. In the state of.

And both ends of the strip conductor 31 are U-shaped on the same side at the middle wide part.
It is used in a state where both legs 33 are bent into a letter shape (a mouth shape in the figure).

Next, the assembly of the bead filter device will be explained.

As shown in FIG. 2, the ferrite bead 2 is inserted into the recess 11 of the pedestal 1, and then both legs 63 of the lead frame 3 are inserted into the center hole and central through hole 12 of the ferrite bead 2, and then the base of the strip conductor 31 is inserted. ) is inserted until it comes into contact with the top surface of the pedestal 1, so that the tips of both legs 33 protrude from the bottom surface of the pedestal 1).
simultaneously press fit into the center and cut the central connecting conductor 32 in the middle,
Then, the tongue-shaped conductor 32 is folded inward along the upper edge of the rectangular recess 16 (see FIG. 1) so as to be in close contact with the inner wall of the rectangular recess 15, and the eight band-shaped conductors 61 are mounted independently from each other on the pedestal. 1 to create a bead filter device. As shown in FIG. 2, a notch 34 is made in the center of the central connecting conductor 32 from both sides to make it narrower.

The tip of the press-fitting jig is brought into contact with this narrow width portion.

Note that the band-shaped conductor 31 can be firmly attached to the pedestal 1 by bonding the band-shaped conductor 51 and the upper surface of the pedestal 1 with an adhesive or the like, or by injecting and solidifying an embedded resin into the rectangular concave shape 15. Further, the upper part of the pedestal may be covered with a box-shaped lid (not shown) that fits onto the pedestal 1.

Since the wide transition portions at the bases of both legs 33 of the band-shaped conductor 51 abut against the upper inner peripheral edge of the ferrite bead 2 and suppress the movement of the ferrite bead 2 within the recess 11, it is not necessary to fix the ferrite bead 2 within the recess 11. do not have.

〔Effect of the invention〕

As described above, according to the present invention, the ferrite beads are arranged all at once on a pedestal and a lead frame that is easy to handle is used, so the process is simple, and therefore the piece filter device is suitable for mounting on a printed circuit board, etc. Assembly time? It can be shortened and assembly can be automated.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing the structure of an embodiment of the bead filter device manufactured according to the present invention, and FIG.
FIG. 2 is an exploded perspective view of FIG. 1 showing the structure of parts constituting the figure. 1... Insulating pedestal, 2... Ferrite beads. 3...Lead frame, 11...Recess, -12...
- Central through-hole, 13... rectangular recess, 61... band-shaped conductor. 32...Central connection conductor, 33...Both legs. Figure 1 Center hole hole

Claims (1)

[Claims] 1. The base includes a plurality of magnetic bodies having through holes, a pedestal made of an insulating material, and a flat lead frame, and the pedestal has an upper surface arranged at predetermined intervals so that the magnetic bodies can be fitted along the opposing side wall. the same number of first recesses as the magnetic bodies provided, a central through hole provided at the bottom of each of the first recesses, and a position equidistant from the first recesses adjacent to each other on the upper surface. a second recess provided therein; the lead frame has a central connecting conductor portion having a length approximately equal to the spacing between opposing end walls of the pedestal; The first recesses extend on both sides in a direction perpendicular to the length direction and are arranged at substantially equal intervals to the intervals between the first recesses adjacent to each other along the opposite side walls of the upper surface of the pedestal, and have a width at least on the tip side. The magnetic material is formed in the first recess of the pedestal, and the magnetic material is formed in the first recess of the pedestal. , a step of inserting the magnetic material into the through-hole of the pedestal so that it is visible from the top and bottom sides of the pedestal; and a step of inserting the strip-shaped conductor portion of the lead frame into the first pedestal facing each other along the end wall direction of the pedestal. a step of forming both leg portions by bending them at right angles to the same side at positions approximately equal to the spacing between the recesses; a step of inserting the lead frame, excluding both legs, into the center through-hole so as to protrude from the bottom surface of the pedestal until the lead frame comes into contact with the top surface of the pedestal; a step of cutting the center connecting conductor at approximately the midpoint between the strip-shaped conductor portions adjacent to each other in the longitudinal direction to form a tongue portion; and inserting the formed tongue portion into the second recessed portion. and bending the bead filter device along the upper edge toward the inside of the second recess.