JPH0740534B2 - Inductance device manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for manufacturing an inductance device for mounting on a substrate such as a ceramic substrate or a printed substrate.

[Technical Background of the Invention and Problems Thereof] In a conventional inductance device, there is a lead frame for supporting an inductor formed by winding a coil around a drum core, for example, as shown in FIG.

A lead frame 10 shown in FIG. 6 has a strip-shaped lead frame body 1 made of a conductive material, a plurality of openings 2 arranged in the lead frame body 1 along the longitudinal direction of the lead frame body 1 at predetermined intervals. The lead terminal 3 extends from the lead frame body 1 so as to face each other in the opening 2.

The lead terminals 3 facing each other include the electrode connecting pieces 3A formed in the same row in the facing direction and the electrode connecting pieces 3A.
3A and positioning pieces 3B formed at both ends.

In the figure, 4 is a feed hole formed at a predetermined pitch.

The lead frame 10 formed in this manner is one in which the lead frame main body 1 is punched and press-molded. The lead frame 10 supports an inductor, for example, a drum core around which a coil (winding) is wound, and has a chip shape. The process of manufacturing an inductance device as an electronic component is as follows.

That is, each pair of lead terminals 3 is erected at a right angle to the surface of the lead frame body 1 along the line Y shown by the one-dot chain line in FIG. 6, and the pair of electrode connecting pieces 3A and the positioning piece 3B face each other. After that, the positioning piece 3B is bent toward the opposite side so as to be parallel to the surface of the lead frame body 1.
Then, a pair of electrode connection pieces 3 that stand upright and face each other in this way
The drum core 5 around which the coil 7 is wound is mounted while bending A and 3A.

At this time, as shown in FIG. 8, the flange portion 6 of the drum core 5 is placed on each of the positioning pieces 3B on both sides, and the position of the drum core 5 is determined.

Next, as shown in FIGS. 7 and 8, the drum core 5
In the electrode 6A formed in the concave portion of the outer end surface of the collar portion 6 in, the both ends 7A of the coil 7 and the pair of electrode connecting pieces 3A, 3
It is assembled as an electronic component on the lead frame main body 1 by electrically connecting A with solder or the like.
The electrical connection at this time is performed by sandwiching the terminal 7A of the coil 7 between the electrode 6A and the electrode connecting piece 3A.

By the way, the lead frame body 1 is punched and press-molded to make a pair of electrode connection pieces 3A, 3A electrically connected to both ends 7A of the coil. The pair of electrode connection pieces 3A, 3A are Since they are press-molded at positions in the same row with respect to the opposite directions, the electrode connecting pieces 3A and 3A cannot be made sufficiently long. As shown in FIG. 9, the length β of the electrode connecting pieces 3A, 3A itself is β = α at the maximum, with respect to the distance α between the protruding portions of the electrode connecting pieces 3A, 3A of the lead terminal 3. This is because it is only possible to have a / 2 relationship.

Particularly, when the length of the drum core 5 in the width direction is L and the height of the drum core 5 is H (see FIG. 7 for both), the drum cores in the relationship of L <H stand upright. Since the dimension of the pair of electrode connecting pieces 3A, 3A (the length from the bottom of the drum core is h) does not reach the height of the center position on the outer end face of the collar part 6, it is formed on the outer end face of the collar part 6. The terminal 7A of the coil 7 to be held by the electrode 6A and the electrode connecting piece 3A cannot be held sufficiently depending on the position where it is pulled out to the outer end surface of the collar portion 6, and thus the electrode connecting piece 3A and the coil terminal 7A. There was a problem in that electrical connection with could not be performed sufficiently.

[Object of the Invention] The present invention pays attention to the structural defect of the electrode connecting piece in the conventional inductance device as described above, corresponds to the shape of the contact portion of the inductor, and can secure a sufficient contact length. It is an object of the present invention to provide a method for manufacturing an inductance device, which is capable of manufacturing an inductance device in which an electrode connection piece is formed and a good electrical connection state with an inductor can be obtained.

[Summary of the Invention] A method of manufacturing an inductance device according to the present invention comprises a step of molding a pair of lead terminals having electrode connection pieces at predetermined intervals on a strip-shaped frame, and electrode connection of each of the lead terminals. The step of standing up the pieces in a facing arrangement, the receiving jig having a curved portion having a pole ratio corresponding to the shape of both electrode surfaces of the inductor, and the pressing having the curved portion having a curvature corresponding to the curved portion of the receiving jig. Each of the standing electrode connection pieces is pressed by using a jig, each electrode connection piece is curved corresponding to the shape of the electrode surface of the inductor, and a step of extending the length more than the length at the time of molding, And a step of mounting and connecting an inductance between the pair of electrode connecting pieces.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the apparatus shown in FIGS. 1 and 2, those having the same functions as those of the conventional apparatus are designated by the same reference numerals, and detailed description thereof will be omitted.

The embodiment apparatus shown in FIG. 1 is different from the conventional apparatus shown in FIGS. 7 and 8 in that the electrode connecting piece 3A 'is pressed and the length h0 from the bottom of the drum core is changed to the electrode connection in the conventional apparatus. That is, it was formed to be longer than the length h of the piece 3A.

Next, a method of manufacturing this device will be described. First, as shown in FIG. 3, the pair of lead terminals 3 are erected along the Y line so as to be substantially perpendicular to the surface of the lead frame main body 1 as in the case of the conventional device, and the pair of electrode connecting pieces 3A '. And the positioning pieces 3B face each other, and then the pair of electrode connecting pieces 3A '
And, the positioning piece 3B is bent to the opposite side.

Next, as shown in FIG. 4, a receiving jig 12A having a curved portion 11A having a curvature corresponding to the shape of both electrode surfaces of the drum core is provided on both side surfaces from below the pair of electrode connecting pieces 3A ', The pair of electrode connecting pieces 3A 'is bent along the bending portion 11A.

Then, from above the receiving jig 12A, a bending jig 11B having a curved portion 11B having a curvature corresponding to that of the bending portion 11A formed on the inner surface of the lower side is lowered while applying a predetermined pressing force, and a pair of electrode connecting pieces is provided.
Press work on 3A '.

As a result, as shown by the broken line in FIG.
Each of 3A 'extends in the length direction more than the length at the time of molding (shown by a solid line in the figure).

Then, between the pair of electrode connecting pieces 3A ′ which are elongated and curved in a state corresponding to the shapes of both electrode surfaces of the drum core 5,
The drum core 5 around which the coil 7 is wound is attached. As a result, the pair of electrode connection pieces 3A 'come into contact with each other along both electrode surfaces of the drum core 5.

At this time, the drum core 5 is placed on the positioning piece 13B and its position is determined. Next, as in the case of the conventional apparatus, the terminal 7A of the coil 7 and the electrode connecting piece 3A 'are electrically connected by soldering or the like at the electrode 6A provided on the outer end surface of the flange portion 6 of the drum core 5. At this time, the pair of electrode connecting pieces 3A ′, 3
Since A ′ is longer than the length at the time of the press molding described above, the dimension reaching the position (height of h0) higher than the position of the central portion on the outer end surface of the collar portion 6 is required. Have

Therefore, the terminal 7A of the coil 7 drawn out to the outer end surface of the collar portion 6 can be sufficiently held by the electrode 6A and the electrode connection piece 3A 'regardless of the drawn position, and the electrode connection piece 3
A sufficient electrical connection state can be obtained by connecting A ′ and the terminal 7A by soldering or the like.

Even if the length H in the height direction of the drum core 5 is longer than the length L in the width direction of the drum core 5, the pair of electrode connection pieces 3 which are press-molded by press working to stand up.
Since the upper ends of A ′ and 3A ′ reach a position higher than the center position on the outer end surface of the drum core 5, there is no problem in holding the coil end 7A and making electrical connection.

Needless to say, the curvatures of the curved portions of the receiving jig 12A and the pressing jig 12B are set according to the curvature of the electrode 6A.

It is needless to say that the present invention is not limited to the above-mentioned embodiments and includes various modifications within the scope of the gist of the present invention.

[Effects of the Invention] According to the present invention described above, a pair of electrode connecting pieces that correspond to the shape of the contact portion of the inductor and can secure a sufficient contact length is formed. Since the inductor is mounted and connected to the inductor, it is possible to provide a manufacturing method capable of manufacturing an inductance device in which the electrode connection piece and the inductor are electrically connected well.

[Brief description of drawings]

FIG. 1 is a side view of an apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the apparatus, FIG. 3 is a perspective view in which lead terminals of a lead frame are erected, and FIG. FIG. 5 is a perspective view showing a press-molding step of the piece, FIG. 5 is a sectional view showing the lead frame after the press-molding step, FIG. 6 is a plan view of the lead frame, FIG. 7 is a side view of a conventional inductance device, and FIG. FIG. 9 is a front view of the same device, and FIG. 9 is an explanatory view showing a relationship of lengths of electrode connecting pieces in lead terminals. 3 ... Lead terminal, 3A '... Electrode connection piece, 5 ... Drum core, 6 ... Collar part, 7 ... Coil, 10 ... Lead frame.

Claims (1)

[Claims] 1. A step of molding a pair of lead terminals having electrode connecting pieces at predetermined intervals on a strip-shaped frame, and a step of standing up the electrode connecting pieces of the respective lead terminals so as to face each other. , Each of the standing electrode connections using a receiving jig having a curved portion having a curvature corresponding to the shape of both electrode surfaces in the inductor and a pressing jig having a curved portion having a curvature corresponding to the curved portion of the receiving jig Step of pressing each piece, bending each electrode connection piece according to the shape of the electrode surface of the inductor, and making it extend more than the length at the time of molding, and mounting the inductor between these pair of electrode connection pieces A method of manufacturing an inductance device, comprising the step of connecting.