JPH06295813A - Rod core - Google Patents
Rod coreInfo
- Publication number
- JPH06295813A JPH06295813A JP10749393A JP10749393A JPH06295813A JP H06295813 A JPH06295813 A JP H06295813A JP 10749393 A JP10749393 A JP 10749393A JP 10749393 A JP10749393 A JP 10749393A JP H06295813 A JPH06295813 A JP H06295813A
- Authority
- JP
- Japan
- Prior art keywords
- core
- rod
- resin coating
- resin
- twisted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、小型アンテナ等として
利用できる棒状コアに関し、特に全周を樹脂でコーティ
ングされる棒状コアに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod-shaped core that can be used as a small antenna or the like, and more particularly to a rod-shaped core whose entire circumference is coated with resin.
【０００２】[0002]
【従来の技術】従来例を図４に示す。図４（ａ）は断面
図、（ｂ）は正面図である。この従来例は、断面が円形
の棒状のフェライトコア４１の全周に樹脂コーティング
４２を施した棒状コアであり、フェライトコア４１の外
径は２．８ｍｍ、長さ２０ｍｍであった。このような棒
状コアは、無線の受信機等のアンテナとして使用される
が、フェライトコアが脆く、壊れやすい性質を持ってい
るため、全周に樹脂コーティングが施されている。2. Description of the Related Art FIG. 4 shows a conventional example. FIG. 4A is a sectional view and FIG. 4B is a front view. This conventional example is a rod-shaped core in which a resin coating 42 is applied to the entire circumference of a rod-shaped ferrite core 41 having a circular cross section, and the ferrite core 41 had an outer diameter of 2.8 mm and a length of 20 mm. Such a rod-shaped core is used as an antenna for a radio receiver or the like, but since the ferrite core has a brittle and fragile property, a resin coating is applied to the entire circumference.
【０００３】[0003]
【発明が解決しようとする課題】この棒状コアに樹脂コ
ーティングを施す場合、棒状コアの周囲に円筒状のコー
ティング部材を挿入し、その円筒状のコーティング部材
と棒状コアとの間に樹脂を流し込んで樹脂コーティング
を行っていたが、この間隔を０．１ｍｍ等として樹脂コ
ーティングを行っていたため、樹脂の流れが悪く、樹脂
コーティングがうまくできなかった。本発明は上記の事
を鑑みて、樹脂コーティングの容易な棒状コアを提供す
ることを目的とする。When resin coating is applied to the rod-shaped core, a cylindrical coating member is inserted around the rod-shaped core, and resin is poured between the cylindrical coating member and the rod-shaped core. Although the resin coating was performed, the resin coating was not performed because the resin flow was bad because the resin coating was performed with this interval being 0.1 mm or the like. The present invention has been made in view of the above circumstances, and an object thereof is to provide a rod-shaped core that can be easily coated with a resin.
【０００４】[0004]
【課題を解決するための手段】本発明は、細長く、丸棒
状のフェライトコアであって、軸方向に伸びる複数の凹
部を有し、該凹部が一端から他端にかけてねじれて形成
されているものである。また本発明は、その棒状コアの
外周に、断面が円形となるように樹脂コーティングを施
すものである。SUMMARY OF THE INVENTION The present invention is an elongated, round bar-shaped ferrite core having a plurality of recesses extending in the axial direction, the recesses being formed by twisting from one end to the other end. Is. Further, according to the present invention, a resin coating is applied to the outer periphery of the rod-shaped core so that the cross section has a circular shape.
【０００５】[0005]
【実施例】本発明に係る一実施例を図１に示す。図１
（ａ）は断面図、（ｂ）は正面図である。この実施例
は、丸棒状のフェライトコア１であって、外周の４ヶ所
に軸方向に伸びる円弧状の凹部２が形成されている。そ
して、この凹部２は、一端から他端にかけて約４０度ね
じれている。このコア１の寸法は、図１（ａ）のｌ寸法
を２．８ｍｍ、ｍ寸法を２．５ｍｍとし、長さを４０ｍ
ｍとした。このコア１の全周に樹脂コーティング５を施
した実施例の断面図を図２（ａ）に、正面図を図２
（ｂ）に示す。実施例では、棒状コアの外径ｎが２．９
ｍｍの円形となるように樹脂コーティングされている。
この樹脂コーティング５は、樹脂コーティングの外径が
２．９ｍｍとなるように設計された円筒状のコーティン
グ部材の内周空間の中央に、前記コア１を配置し、該コ
ア１とコーティング部材との間に樹脂を流し込んで樹脂
コーティングを行ったものである。このとき、コア１の
外周に形成されたねじれた凹部２により、樹脂の流れが
改善され、容易に樹脂コーティングを行うことができ
た。また本発明に係る別の実施例を図３に示す。この図
３（ａ）は断面図、（ｂ）は正面図である。この実施例
は、丸棒状のフェライトコア３であって、外周の３ヶ所
に軸方向に伸びる円弧状の凹部４が形成されている。こ
の凹部４も、一端から他端にかけてねじれて形成されて
いる。このコア３の寸法は、図１のｌ寸法に該当する部
分が２．３ｍｍ、ｍ寸法に該当する部分が２．０ｍｍで
あり、長さを１５ｍｍとした。また、このコア３への樹
脂コーティングは、上述のとおりである。また、図１、
図３に示す棒状のフェライトコアは、非常に細長い形状
であり、粉末圧縮成形法では形成することが困難であ
り、本発明では押し出し成形法により形成した。また、
本発明は、このようにコアが細長いことに起因してお
り、外径が５ｍｍ以下、長さが１０ｍｍ以上のコアにお
いて、特に有効なものである。そして、この押し出し成
形により、ねじれた凹部を容易に形成することができ
る。尚、このねじれた凹部は、一端から他端にかけて約
５度以上ねじれていることが好ましい。FIG. 1 shows an embodiment according to the present invention. Figure 1
(A) is sectional drawing, (b) is a front view. In this embodiment, a ferrite core 1 in the shape of a round rod is formed, and four arc-shaped recesses 2 extending in the axial direction are formed at four locations on the outer circumference. The recess 2 is twisted by about 40 degrees from one end to the other end. The dimensions of this core 1 are as follows: l dimension of FIG. 1 (a) is 2.8 mm, m dimension is 2.5 mm, and length is 40 m.
m. FIG. 2A is a sectional view of an embodiment in which the resin coating 5 is applied to the entire circumference of the core 1, and FIG.
It shows in (b). In the example, the outer diameter n of the rod-shaped core is 2.9.
It is resin-coated so as to have a circular shape of mm.
In the resin coating 5, the core 1 is arranged in the center of the inner peripheral space of a cylindrical coating member designed so that the outer diameter of the resin coating is 2.9 mm. Resin is poured in between to perform resin coating. At this time, due to the twisted concave portion 2 formed on the outer periphery of the core 1, the resin flow was improved, and the resin coating could be easily performed. Another embodiment according to the present invention is shown in FIG. 3A is a sectional view and FIG. 3B is a front view. In this embodiment, the ferrite core 3 is in the shape of a round bar, and arcuate recesses 4 extending in the axial direction are formed at three locations on the outer circumference. This recess 4 is also formed by twisting from one end to the other end. The core 3 has a dimension of 2.3 mm at a portion corresponding to dimension l in FIG. 1, 2.0 mm at a portion corresponding to m dimension, and a length of 15 mm. The resin coating on the core 3 is as described above. Also, in FIG.
The rod-shaped ferrite core shown in FIG. 3 has a very elongated shape and is difficult to form by the powder compression molding method. In the present invention, it is formed by the extrusion molding method. Also,
The present invention is due to the elongated core as described above, and is particularly effective for a core having an outer diameter of 5 mm or less and a length of 10 mm or more. Then, by this extrusion molding, the twisted concave portion can be easily formed. The twisted concave portion is preferably twisted by about 5 degrees or more from one end to the other end.
【０００６】[0006]
【発明の効果】本発明によれば、非常に細長い棒状のフ
ェライトコアにおいて、ねじれた凹部によって樹脂コー
ティングが容易となり、棒状コアの生産効率を向上させ
ることができ、有益なものである。Industrial Applicability According to the present invention, in a very elongated rod-shaped ferrite core, resin coating is facilitated by the twisted recesses, and the production efficiency of the rod-shaped core can be improved, which is advantageous.
【図１】本発明に係る一実施例の断面図（ａ）と正面図
（ｂ）である。FIG. 1 is a sectional view (a) and a front view (b) of an embodiment according to the present invention.
【図２】本発明に係る一実施例に樹脂コーティングを施
した断面図（ａ）と正面図（ｂ）である。FIG. 2 is a sectional view (a) and a front view (b) in which a resin coating is applied to an embodiment according to the present invention.
【図３】本発明に係る別の実施例の断面図（ａ）と正面
図（ｂ）である。FIG. 3 is a sectional view (a) and a front view (b) of another embodiment according to the present invention.
【図４】従来例の断面図（ａ）と正面図（ｂ）である。FIG. 4 is a sectional view (a) and a front view (b) of a conventional example.
１、３ 棒状フェライトコア ２、４ 凹部 ５ 樹脂コーティング 1,3 Rod-shaped ferrite core 2,4 Recess 5 Resin coating
Claims (2)
て、軸方向に伸びる複数の凹部を有し、該凹部が一端か
ら他方にかけてねじれて形成されていることを特徴とす
る棒状コア。1. A rod core, which is an elongated, round bar-shaped ferrite core, having a plurality of recesses extending in the axial direction, the recesses being formed by twisting from one end to the other.
面円形となるように樹脂コーティングを施したことを特
徴とする棒状コア。2. The rod-shaped core according to claim 1, wherein a resin coating is applied so as to have a circular cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10749393A JPH06295813A (en) | 1993-04-08 | 1993-04-08 | Rod core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10749393A JPH06295813A (en) | 1993-04-08 | 1993-04-08 | Rod core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06295813A true JPH06295813A (en) | 1994-10-21 |
Family
ID=14460613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10749393A Pending JPH06295813A (en) | 1993-04-08 | 1993-04-08 | Rod core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06295813A (en) |
-
1993
- 1993-04-08 JP JP10749393A patent/JPH06295813A/en active Pending
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