JPH0537449Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a small wire-wound inductor having a drum-shaped core wound with wire.

[Prior Art] As shown in Fig. 4, this type of small wire-wound inductor has a drum-shaped core 1 that is tapered in the middle.
and a coil wire 2 wound around the middle part of this core 1.
It consists of. Conventionally, the specific structure of this small wire-wound inductor is as shown in FIG. 4, for example.
Using a lead terminal 3 with lead wires 5, 5 protruding from the center of the flange-shaped joints 4, 4, the joints 4, 4 are fixed to the end face of the core 1, and the ends 2a, 2a, this joint 4,
4, an inductor element that is conductively fixed has been proposed. (Utility Model Application Publication No. 60-20118) However, with this inductor element, the long lead wires 5, 5 get in the way, making it troublesome to connect the terminals 2a, 2a of the coil wire 2 to the joints 4, 4. It is. Furthermore, since the wire-wound inductor is mounted on a circuit board, when the lead wires 5, 5 are bent, the joint portion 4 is directly subjected to the impact and easily breaks. Furthermore, since it can only be used as a so-called axial type wire-wound inductor, in which the lead wires 5, 5 are drawn out on an extension of the central axis of the component body, it can be adapted to various mounting methods on circuit boards. First, there was the problem that the scope of application was limited.

Therefore, a small wire-wound inductor has been proposed in which a recess is provided in the center of the end face of the core, a cylindrical member is fitted into this recess, and the tip of a lead wire is further fitted into this cylindrical member (in practical use). Publication No. 58-46422).

According to this small wire-wound inductor, the end of the coil wire can be connected to the cylindrical member before the lead wire is fitted into the cylindrical member. Further, other terminal members can be fitted instead of the lead wires. Therefore, problems such as difficulty in connecting the ends of the coil wire and limitations on the form of the lead terminal are solved.

[Problem to be solved by the invention] In the case of the latter small wire-wound inductor, the terminal member is held in a cylindrical member fitted to the end face of the core, so the cylindrical member is securely attached to the core. must be mated and fixed. Therefore, in the above-mentioned small wire-wound inductor, a so-called force fit method is adopted in which the cylindrical member is tightly fitted into a hole formed in the end face of the core.

However, in the current situation where electronic components are becoming extremely miniaturized, it is extremely difficult to force-fit a cylindrical member much smaller than the core into the core hole, and the cylindrical member may be crushed or bent, etc. There are many problems where the tip of the lead wire cannot be inserted or becomes loose. Furthermore, due to the deformation of the cylindrical member, it is likely to fall off from the core, and in this case, the lead wire will also fall off. Therefore, when the wire-wound inductor is miniaturized, the assembly yield becomes extremely poor and productivity becomes low.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a small wire-wound inductor in which a core and a terminal member can be easily assembled and troubles such as the terminal member coming off are less likely to occur.

[Means for Solving the Problems] That is, the object of the present invention is to provide shallow recesses 11b, 11b with a large diameter at the center of both end faces, and to provide a recess 11b, 11b with a narrow diameter at the center of the recesses 11b, 11b. A drum-shaped core 11 having deep recesses 11a, 11a, a coil wire 12 wound around the drum-shaped core 11, and a shallow groove on both end surfaces of the core 11 electrically connected to the terminals of the coil wire 12. Anchors 13, 13 consisting of flange portions 14, 14 fitted and fixed in recesses 11b, 11b, and cylindrical portions 15, 15 protruding from the center of the flange portions 14, 14, the anchor 13, The base end is inserted into the deep recess 11a, 11a of the drum-shaped core 11 from the side of the cylindrical part 15, 15 of the anchor 13, and the part closer to the tip is conductively fixed to the cylindrical part 15, 15 of the anchor 13, 13. This is achieved by a small wire-wound inductor characterized by comprising a terminal member having a cylindrical shape.

[Function] In the present invention, since the base end of the terminal member is inserted into the deep recess 11a, 11a of the drum-shaped core 11 from the cylindrical portion 15, 15 side of the anchor 13, 13, the terminal member recesses 11a, 11
It is fixed directly to a. Furthermore, the recess 11a,
A portion closer to the distal end than the proximal end fixed to 11a is conductively fixed to the cylindrical portions 15, 15 of the anchors 13, 13. In other words, the terminal member has recesses 11a, 1
1a and the cylindrical members 15, 15 of the anchors 13, 13
It is fixed to both sides.

On the other hand, the anchors 13, 13 also have flange portions 14, 14 in the shallow recesses 11b, 11b of the core 11.
Since the terminal member is fitted and fixed to the cylindrical portions 15 and 15, it is fixed to both the core 11 and the terminal member.

In this way, in the winding component of the present invention, the terminal members are not fixed to the core 11 via the anchors 13, 13, but are each directly fixed to the core 11, and at the same time, they are fixed to each other. Therefore, they can be reliably fixed to the core 11 without relying on mechanical strength due to forced fitting or the like.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the core 11 is drum-shaped, thick at both ends and thin at the middle, and is usually made of a ferromagnetic material such as ferrite. A coil wire 12 is wound around the thin middle part.
At the center of the end face of the core 11, shallow recesses 11b, 11b having a large diameter are formed, and at the center thereof, recesses 11a, 11a, which are narrow and deep, are formed. The coil wire 12 is tightly wound around the middle part of the core 11, and both ends thereof are drawn out to both sides of the core 11.

The anchors 13, 13 have flange parts 14, 14
and cylindrical tubular parts 15, 15 protruding from the center to one side, and a through hole is formed on the central axis of the tubular parts 15, 15. This anchor 1
3 and 13 have their flange portions 14, 14 fitted into shallow, large-diameter recesses 11b, 11b, and are fixed therein with an adhesive. In this state, the cylindrical portions 15, 15 of the anchors 13, 13 and the deep, small diameter recesses 11a, 11a of the core 11 are aligned in a straight line, forming a deep hole.

The coil wire 1 drawn out on both sides of the core 11
Both terminals 12a, 12a of the anchor 1
3 and 13 are conductively fixed. The conductive fixing means is, for example, both ends 12a of the coil wire 12,
12a to the cylindrical parts 15, 15 of the anchors 13, 13
After wrapping it around the base, it can be soldered, wrapped, welded, brazed, etc., depending on the situation. In the illustrated case, the ends 12a, 12a of the coil wire 12 are soldered to the flange parts 14, 14 of the anchors 13, 13.

A terminal member constituting a terminal portion is fitted into a hole formed by the cylindrical portions 15, 15 of the anchors 13, 13 and the recesses 11a, 11a of the core 11. That is, as shown in FIGS. 2 and 3, the tips of these terminal members are fitted into the recesses 11a, 11a of the core 11 from the cylindrical members 15, 15 side, and are fixed. Furthermore, the recesses 11a, 1 of this terminal member
A portion closer to the tip than the portion fitted to 1a is conductively fixed to the cylindrical portions 15, 15 of the anchors 13, 13.

By fitting various conductors as the terminal members and fixing them conductively, small wire-wound inductors having various forms can be constructed. FIG. 1 shows some examples of this terminal section.

For example, as shown in FIG. 2, a small wire-wound inductor with a lead shape can be constructed by inserting the base ends of the lead terminals 16, 16 into the holes and fixing them conductively. The lead terminals 16, 16 shown at the top in FIG. 1 are straight, and the lead terminals 16, 16 shown at the bottom are bent at 90 degrees at a portion closer to the base end. If you use the former,
In the case of the so-called axial lead type inductor, in which the lead wires are led out from both ends of the element in an extension of each other, and in the case of the latter, the so-called radial lead type inductor, in which the lead wires are led out in the same direction almost parallel to each other. Each can be configured as an inductor. In FIG. 2, reference numeral 21 indicates an exterior body, which is formed by applying an insulating resin paint and curing it.

Note that as the conductive fixing means, means such as soldering and adhesion using a conductive adhesive can be used. In this case, as shown in the drawing, lead terminal 1
It is preferable to provide a step 16a, 16a in the shape of a thicker flange or a step in the form of a groove cut into the circumferential surface at the base end portions 6, 16.

Alternatively, plate-shaped terminals 17, 17 as shown in FIG. 1 having protrusions 18, 18 protruding from the center may be used, and the protrusions 18, 18 may be fitted into the anchors 13, 13 for conductive fixation. Therefore, it can be configured as a so-called chip-type wire-wound inductor. In FIG. 1, the plate-shaped terminal 1 shown above
7 and 17 are disk-shaped, and therefore, it is convenient to apply the exterior coating 21 to have a cylindrical shape or a shape similar to this to form a cylindrical chip-shaped inductor. In addition, the plate terminals 17, 17 shown below
is formed into a square plate shape, which is convenient for constructing it as a square chip-shaped inductor.

Furthermore, in the case of using a long plate-shaped lead pin as shown by the reference numeral 19 in FIG.
As shown in FIG. 3, the protrusions 20, 20 formed at the proximal ends are inserted into the anchors 13, 13 and conductively fixed. Furthermore, the exterior body 21 is formed into a cubic shape, and the lead pins 19 are formed along this outer shape.
By bending the wire, a square chip-shaped small wire-wound inductor can be constructed.

[Effects of the Invention] As explained above, according to the present invention, it is possible to provide a small wire-wound inductor in which the core and the terminal member are easily assembled and troubles such as the terminal member etc. are less likely to come off.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded view showing an example of a small wire-wound inductor and its various terminals according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional side view of a small wire-wound inductor using lead terminals, and FIG. The figure is a longitudinal side view of a small wire-wound inductor using lead pins, and FIG. 4 is a longitudinal side view showing a conventional example of a small wire-wound inductor. 11...Core, 11a...Recessed portion of core, 12...
... Coiled wire, 13 ... Anchor, 14 ... Anchor flange, 15 ... Anchor cylindrical body, 1
6...Lead terminal, 17...Plate terminal.

Claims (1)

[Claims for Utility Model Registration] A shallow recess 11 with a large shallow diameter in the center of both end faces.
b, 11b, and recesses 11a, 11a with a smaller diameter and deeper provided at the center of the recesses 11b, 11b.
a drum-shaped core 11 having a drum-shaped core 11; a coil wire 12 wound around the drum-shaped core 11; electrically connected to the terminal of the coil wire 12;
In addition, shallow recesses 11b, 1 on both end surfaces of the core 11
Flange parts 14, 14 fitted and fixed to 1b
and a cylindrical portion 15, 15 protruding from the center of the flange portions 14, 14,
13. Deep recesses 11a, 11 of the drum-shaped core 11 from the cylindrical portions 15, 15 side of the anchors 13, 13.
A small wire-wound inductor comprising: a terminal member whose proximal end is inserted into the terminal a, and whose proximal end is electrically conductively fixed to the cylindrical portions 15, 15 of the anchors 13, 13.