JPS634690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a small fixed inductor equipped with so-called radial terminal pins.
The present invention relates to a method that is easy to manufacture and can continuously manufacture a large number of cores with terminal pins.

Conventionally, this type of small fixed inductor has a hole 4 for fixing a terminal pin 3 to a lower rib 2 of a drum-shaped ferrite core 1, as shown in FIG.
One end of the terminal pin 3 cut to a predetermined length is inserted into the hole 4 and fixed with adhesive, and then
A winding 5 was applied to the core, a lead wire 6 of the coil was wrapped around the base of the terminal pin 3 and soldered, and then a case, thermosetting resin, or other exterior covering was applied.

However, with this manufacturing method, the terminal pins must be inserted and fixed one by one into shallow holes made in the brim of the extremely small drum-shaped core 1, which is a cumbersome process. Since it is difficult to press-fit the terminal pin into the collar of the core, it is difficult to make the terminal pin self-retaining, and it cannot be moved until the adhesive has solidified, so it has disadvantages that make it unsuitable for continuous manufacturing processes. Ta. Moreover, since the manufactured fixed inductor had terminal pins planted in holes in the very thin collar 2, the fixing strength was not sufficient, and the terminal pins often fell off from the core.

The fixed inductor manufacturing method of the present invention eliminates the drawbacks of the conventional manufacturing method as described above, and enables continuous and efficient manufacture of cores with terminal pins. A large and durable fixed inductor can be obtained.

The present invention uses a core having a plurality of ribs in which auxiliary ribs with a diameter smaller than the ribs are provided at intervals on the outside of the rib that partitions the winding portion of the core, and a plurality of ribs are arranged in a continuous manner. A core with a terminal pin is manufactured by inserting the metal wire between the collar and the auxiliary collar, fixing the metal wire to the core, and then cutting it.

Embodiments of the present invention will be described in detail below with reference to the drawings of FIGS. 2 to 5.

FIG. 2 is a front view of the core used in the example. This core 21 is a so-called drum-shaped core.
It is molded from a magnetic material such as ferrite, and has an upper rib 22 and a lower rib 23 that partition the part where the coil is wound.In addition, there is a gap G approximately equivalent to the diameter of the terminal pin on the outside of the lower rib 23. An auxiliary collar 24 is provided between the two. 25 is a connecting portion between the lower collar 23 and the auxiliary collar 24. The diameter of the auxiliary collar is made smaller than the diameter of the collars 22 and 23.

FIG. 3 is an explanatory diagram of the manufacturing process, in which a plurality (any number) of the cores 21 shown in FIG. 2 are held in a jig (not shown) and arranged in a line at a predetermined interval. (Figure 3A). In this case, the distance between each core may be set at a distance corresponding to the length of the terminal pin to be attached later.

Next, a plurality of cores 21a and 21b are arranged.
Gap G between each collar 23 and auxiliary collar 24 of ~21n
Then, two continuous metal wires 26 are inserted from both sides so as to sandwich the joint 25 between the collar and the auxiliary collar, and are stretched in parallel (FIG. 3B). When this state is viewed from the bottom, it becomes as shown in FIG. 3C. Here, the adhesive 27 is applied to the gap G and hardened to firmly fix the part of the metal wire 26 inserted between the collar and the auxiliary collar. Of course, if a heat-resistant epoxy resin or the like is used as the adhesive, and if heating or infrared ray irradiation is used in conjunction with the adhesive to aid in curing, the solidification processing time can be shortened.

Note that if a partially crushed large-diameter portion (not shown) is provided at the insertion portion of the metal wire 26 into the core gap, and that portion is press-fitted, movement of the metal wire will be avoided even when processing a large amount. In addition, the mounting strength of the terminal pin can be increased. Although the auxiliary collar is more durable than the conventional collar 2 with a hole,
It goes without saying that the large-diameter portion should be kept to a level where it is easily deformed so as not to cause damage to the core.

Subsequently, the core group to which the metal wire 26 is fixed is cut into individual cores to produce cores with terminal pins (FIG. 3D). Taking the core 21b as an example, one metal wire is cut near the outer periphery of the core 21a and near the core 21b itself on the core 21c side across the adhesive fixing part, and becomes the terminal pin 28b. is cut near the core 21b itself on the core 21a side and near the outer periphery of the core 21c to form a terminal pin 28'b. That is, for each core, one metal wire is cut after the immediately preceding core, and the other wire is cut before the immediately following core, so that each terminal pin 28 is cut in the opposite direction as shown in FIG. A core with protruding terminal pins is formed. Note that cutting the metal wire 26 is as follows:
Unnecessary protrusion can be avoided by doing this along the tangential direction of the outer periphery of the brim of each core.

As shown in FIG. 5, the terminal pin 28 is bent at a right angle in the C outward direction near the outer periphery of the collar 23 of the core 21. A coil 29 is wound around the winding portion of the core 21 , and both ends of the coil 29 are led out as lead wires 30 and tied around the bent portions of the terminal pins 28 . The rib portion 31 is located on the side of the auxiliary collar 24 and is provided so as not to protrude below the bottom surface of the auxiliary collar. Alternatively, although not shown, in order to make the terminal pin 28 protrude outward for insertion into the printed circuit board, the end opposite to the long cut side is slightly extended, and that part is similarly bent outward. A lead wire may be tied near the bend. Since the diameter of the auxiliary flange 24 is smaller than that of the flange 23, a gap is formed between the auxiliary flange 24 and the bent portion of the terminal pin 28, so that the tying operation can be easily performed. The exposed portion 31 is dipped in solder and soldered. Furthermore, if necessary, a synthetic resin layer is applied, a resin case is attached, and the exterior is provided. Note that the mounting agent is not shown in FIG. 5.

In the embodiments described above, the metal wires are inserted and inserted into a plurality of arranged cores almost simultaneously, but in the manufacturing method of the present invention, the metal wires are sequentially inserted into a plurality of cores while the cores are arranged. There is no hindrance to inserting and inserting wires. Further, the core group connected by the metal wires 26 may be individually cut to form cores with terminal pins, a plurality of cores may be cut at the same time, or a plurality of cores may be cut individually in sequence. These means are appropriately selected depending on the apparatus, especially when the present invention is implemented by an automatic machine. As described above, the method for manufacturing a fixed inductor according to the present invention uses a core in which an auxiliary flange is provided with a gap on the outside of the flange that partitions the winding part, and a metal wire serving as a terminal pin is provided between the flange and the auxiliary flange. Since the metal wires are fixed, it is easy to attach the metal wires, and since a plurality of cores connected by the metal wires can be handled at the same time, fixed inductors can be manufactured through a continuous manufacturing process. The invention is therefore suitable for continuous production in automatic machines.

Further, since the metal wires are attached to the cores arranged at predetermined intervals and the cores are cut to form the terminal pins, there is no waste of material even in automatic manufacturing. According to the present invention, since the terminal pin is fixed between the core rib and the auxiliary rib, a fixed inductor with a high terminal pin attachment strength can be obtained. Moreover, there is no need to provide a hole for attaching a terminal pin in the brim as in the conventional case.
Applicable to manufacturing small fixed inductors. In the fixed inductor manufactured according to the present invention, when the metal wire is cut so that each terminal pin protrudes in the opposite direction, the terminal pins are drawn out on the diagonal line of the drum core's collar, and the interval between the terminal pins can be adjusted at the bent part. , there is a large degree of freedom in design. Further, since the auxiliary brim is formed with a smaller diameter than the brim, it is easy to tangle the lead wire of the coil, and the tangled portion is protected, which has the advantage of reducing wire breakage.

As described above, the present invention has great industrial effects in manufacturing small fixed inductors.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional fixed inductor, Figure 2 is a front view of a conventional fixed inductor.
5 to 5 relate to a manufacturing method according to an embodiment of the present invention, and FIG. 2 is a front view of a core of an embodiment;
FIG. 3 is an explanatory diagram of the manufacturing process, FIG. 4 is a perspective view of the core with terminal pins attached, and FIG. 5 is a front view of the fixed inductor. 21...Core, 22, 23...Brim, 24...Auxiliary brim, 27...Adhesive, 28...Terminal pin, 29...Coil, 30...Lead wire, 31...Tangled portion.

Claims (1)

[Scope of Claims] 1. A plurality of cores each having a plurality of flanges, each having a plurality of auxiliary flanges with a diameter smaller than the flanges that partition the winding portions and provided with a gap on the outside of the flanges, each having a predetermined distance between the cores. The process of arranging the plurality of cores at intervals, inserting and stretching two continuous metal wires between the ribs of the plurality of cores and the auxiliary ribs in parallel so as to sandwich the joint between the ribs and the auxiliary ribs, and then stretching them with an adhesive. The step of fixing the metal wire to the core, cutting the metal wire for each core, one after the immediately preceding core and the other before the immediately following core, so that each terminal pin protrudes in the opposite direction. 1. A method for manufacturing a fixed inductor, comprising the steps of: bending the terminal pin in the middle and shaping the terminal pin so that it is parallel to the central axis of the core. 2. The method of manufacturing a fixed inductor according to claim 1, characterized in that the metal wire is inserted into a plurality of cores arranged substantially simultaneously. 3. The method of manufacturing a fixed inductor according to claim 1, wherein the arrangement of the cores and the insertion and insertion of the metal wires are performed sequentially for each core.