JP2011077542A - Surface-mounting transformer - Google Patents

Surface-mounting transformer Download PDF

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JP2011077542A
JP2011077542A JP2010274772A JP2010274772A JP2011077542A JP 2011077542 A JP2011077542 A JP 2011077542A JP 2010274772 A JP2010274772 A JP 2010274772A JP 2010274772 A JP2010274772 A JP 2010274772A JP 2011077542 A JP2011077542 A JP 2011077542A
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terminal
coil
shield case
lead
transformer
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JP4998611B2 (en
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Koji Matsuo
晃二 松尾
Seiji Kono
誠司 河野
Shinichi Wakui
伸一 涌井
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Mitsumi Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface-mounting transformer capable of improving magnetic shielding properties for a coil. <P>SOLUTION: The transformer including a coil 14, an insulating base 12 where the coil 14 is fixed, and a lead terminal 18 connected to the coil 14 and also soldered to a substrate mounting surface is stored in an inner shield case portion 16A, which is stored in an outer shield case portion 16B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は面実装型トランスに関するものであり、特に、電子回路基板に面実装するタイプの面実装型トランスに関するものである。   The present invention relates to a surface-mount transformer, and more particularly to a surface-mount transformer of the type that is surface-mounted on an electronic circuit board.

従来、このような面実装型トランスは、例えば特許文献１で示すような構造や、図５及び図６に示すような構造が知られている。   Conventionally, such a surface mount type transformer has a structure as shown in, for example, Patent Document 1 and a structure as shown in FIGS. 5 and 6.

図５及び図６に示す面実装型トランス１は、絶縁性基台２の側面に、該基台２から水平方向に突設された複数のリード端子３，３，…を設けているとともに、角形シールドケース４で外側が覆われている、図示せぬコイルボビンの外周面に巻線されているコイルの各巻線引き回し部５ａ，５ａ…を、それぞれ対応するリード端子３，３…の根元部分３ａに絡げ、絡げ部５と根元部分３ａとを半田固定している。そして、各リード端子３の先端部３ｂは下側に向かってＬ字形状に折り曲げられ、図６に示すように、その先端部３ｂを電子回路基板６に半田付けすることにより、面実装型トランス１は電子回路基板６の実装面に取り付けられる。   The surface mount transformer 1 shown in FIGS. 5 and 6 is provided with a plurality of lead terminals 3, 3,... Projecting horizontally from the base 2 on the side surface of the insulating base 2. The winding lead portions 5a, 5a,... Of the coils wound around the outer peripheral surface of a coil bobbin (not shown) whose outer sides are covered with the rectangular shield case 4 are respectively connected to the root portions 3a of the corresponding lead terminals 3, 3,. The entangled portion 5 and the root portion 3a are fixed by soldering. Then, the tip 3b of each lead terminal 3 is bent in an L shape downward, and the tip 3b is soldered to the electronic circuit board 6 as shown in FIG. 1 is attached to the mounting surface of the electronic circuit board 6.

図７は、リード端子３にコイルの巻線引き回し部５ａを絡げ部５に接続した様子を示す図である。リード端子３は、一部が基台２に埋設され、残りの部分が外部に突出している。そして、リード端子３の外部に突出している根元部３ａに、コイルの絡げ部５が接続されている。   FIG. 7 is a diagram showing a state in which the coil winding lead part 5 a is connected to the lead terminal 3 and the tangled part 5. A part of the lead terminal 3 is embedded in the base 2 and the remaining part protrudes to the outside. A coil binding portion 5 is connected to a root portion 3 a protruding outside the lead terminal 3.

特開平１０−１３５０４５号公報（図４、図５）。Japanese Patent Laid-Open No. 10-135045 (FIGS. 4 and 5).

ところで、特許文献１記載の面実装型トランス、及び図５及び図６に示すような構造の面実装型トランスにおいては、コイルにおける巻線引き回し部５ａの絡げ処理を、自動巻線機を用いて直接リード端子３に絡げている。一般に、自動巻線機を用いた巻線絡げ処理では、特に、絡げ処理の始めと巻線切断時は最も強い張力がリード端子３に加わる。しかし、リード端子３の屈曲強度は弱い。このため、図７に実線で示すリード端子３のように、点線で示す正常位置のリード端子３に対して、不要な曲がりが生ずることが多い。   By the way, in the surface mount type transformer described in Patent Document 1 and the surface mount type transformer having the structure as shown in FIGS. 5 and 6, the automatic winding machine is used for the binding process of the winding lead portion 5 a in the coil. Directly tangled to the lead terminal 3. Generally, in the winding process using an automatic winding machine, the strongest tension is applied to the lead terminal 3 particularly at the beginning of the binding process and when the winding is cut. However, the bending strength of the lead terminal 3 is weak. For this reason, like the lead terminal 3 shown by the solid line in FIG. 7, unnecessary bending often occurs with respect to the lead terminal 3 at the normal position shown by the dotted line.

したがって、上記巻線張力のために、リード端子３に不要な曲がりが生じた場合には、リード端子３の先端部３ａと電子回路基板６の導体部との位置がずれ、実装基板への半田付け不良が生じてしまうという問題点があった。   Therefore, when an unnecessary bend occurs in the lead terminal 3 due to the winding tension, the positions of the tip 3a of the lead terminal 3 and the conductor of the electronic circuit board 6 are shifted, and the solder to the mounting board There was a problem that improper attachment occurred.

また、外部で使用する機器等に組み込まれる場合には、さらに防水性を高めるのに、電子回路基板６上で、リード端子３の周囲に、シリコン・ウレタン等の防水用樹脂封止材を充填することも多い。しかし、防水用樹脂封止材は温度変化による膨張・収縮が激しい。このため、防水用樹脂封止材が温度変化を起こすと、巻線引き回し部も温度変化で応力が発生する。巻線引き回し部５ａは絡げ部５とリード部３の固定の為にはんだを用いるが、そのはんだが付着する為、付着するはんだの影響で膨張係数が非常に小さくなり、かつ巻線引き回し部の強度がはんだ付着前に比べ、はんだにより巻線引き回し部に銅食われが発生し、コイルが焼け細くなる為、強度は大きく低下する。その為防水用樹脂封止材の様に膨張係数が大きい物が封止されると膨張係数の差により応力が加わり、コイルの巻線引き回し部５ａの部分に外力が付与され、疲労断線を起こすという問題点もある。   In addition, when incorporated in equipment used externally, a waterproof resin sealing material such as silicon / urethane is filled around the lead terminals 3 on the electronic circuit board 6 in order to further enhance waterproofness. There are many things to do. However, the resin sealing material for waterproofing is severely expanded and contracted due to temperature changes. For this reason, if the waterproof resin sealing material undergoes a temperature change, stress also occurs in the winding lead portion due to the temperature change. The winding lead portion 5a uses solder for fixing the binding portion 5 and the lead portion 3. However, since the solder adheres, the expansion coefficient becomes very small due to the influence of the attached solder, and the winding lead portion. Compared to before the solder adheres, the solder causes copper erosion at the winding lead portion, and the coil is burnt and thinned, so that the strength is greatly reduced. For this reason, when a material having a large expansion coefficient such as a resin sealing material for waterproofing is sealed, stress is applied due to the difference in expansion coefficient, and external force is applied to the winding lead portion 5a of the coil, causing fatigue disconnection. There is also a problem.

そこで、コイルの巻線引き回し部の断線をなくして信頼性を向上させるとともに、リード端子の不要な曲がりを防止して、基板実装面への半田付けを確実に行うことができるようにするために解決すべき技術的課題が生じてくるのであり、本発明はこの課題を解決することを目的とする。   Therefore, in order to improve the reliability by eliminating the disconnection of the coil winding part, to prevent unnecessary bending of the lead terminal, and to ensure that the soldering to the board mounting surface can be performed. A technical problem to be solved arises, and the present invention aims to solve this problem.

本発明によれば、
コイルと、該コイルが固定される絶縁性の基台と、該コイルと接続されるとともに基板実装面に半田付けされるリード端子とを備えたトランスと、
前記トランスを収容する内側シールドケース部と、
前記内側シールドケース部を収容する外側シールドケース部と
を備えることを特徴とする面実装型トランスが提供される。
前記トランスは、外周面に前記コイルが巻線された第１コアを備える。
前記コイルの外周と前記内側シールドケース部の内周面の間には、第２コアが配置される。
前記内側シールドケース部の前記内周面に第１ねじ部が形成され、前記第２コアの外周面に前記ネジ部と螺合する第２ねじ部が形成され、前記第２コアは前記第１ねじ部と前記第２ねじ部により前記内側シールドケース内で可動とされている。 According to the present invention,
A transformer including a coil, an insulating base on which the coil is fixed, and a lead terminal connected to the coil and soldered to the board mounting surface;
An inner shield case for accommodating the transformer;
There is provided a surface mount type transformer comprising an outer shield case portion for accommodating the inner shield case portion.
The transformer includes a first core around which the coil is wound on an outer peripheral surface.
A second core is disposed between the outer periphery of the coil and the inner peripheral surface of the inner shield case portion.
A first screw portion is formed on the inner peripheral surface of the inner shield case portion, a second screw portion is formed on the outer peripheral surface of the second core to be screwed with the screw portion, and the second core is the first core. The screw part and the second screw part are movable in the inner shield case.

参考例の面実装型トランスは上記目的を達成するために提案されたものであり、巻線が施された巻枠体を支持している絶縁性の基台から水平方向に突出されている複数のリード端子に、前記巻線のリード部を絡げてなる面実装型トランスにおいて、前記リード端子を、基板実装面に半田付けされる端子部と、該端子部よりも上方に位置し、かつ前記巻線のリード部を絡げる端末処理部とで構成し、前記端子部と前記端末処理部との間を前記基台に固定してなる。   The surface mount type transformer of the reference example has been proposed to achieve the above object, and is a plurality of horizontal projections that protrude from the insulating base that supports the winding frame body on which the winding is applied. In a surface-mount transformer in which the lead portion of the winding is entangled with the lead terminal of the wire, the lead terminal is positioned above the terminal portion, the terminal portion soldered to the board mounting surface, and It comprises a terminal processing unit that binds the lead portion of the winding, and is fixed to the base between the terminal unit and the terminal processing unit.

この構成によれば、基板実装面に半田付けされる端子部と巻線のリード部を絡げる端末処理部とを分離した構造にしているので、コイル巻線切断時における巻線張力は、端子部に直接加わることがない。したがって、巻線のリード部の絡げ処理時に、端子部に不要な曲がりが生じない。   According to this configuration, since the terminal portion soldered to the board mounting surface and the terminal processing portion entwining the lead portion of the winding are separated, the winding tension at the time of cutting the coil winding is There is no direct contact with the terminal. Therefore, unnecessary bending does not occur in the terminal portion during the binding process of the lead portion of the winding.

また、端子部側からの外力も、端末処理部には直接加わることがない。したがって、端子部側に変形が発生しても、巻線のリード部に不要な力が加わることもない。   Further, external force from the terminal part side is not directly applied to the terminal processing part. Therefore, even if deformation occurs on the terminal portion side, unnecessary force is not applied to the lead portion of the winding.

参考例の面実装型トランスは、上記端子部を、上記基台の底面に露出させて、該基台の側面最下端部から外側に向かって水平直線状に突設してなる。   In the surface mount type transformer of the reference example, the terminal portion is exposed on the bottom surface of the base, and is projected in a horizontal straight line from the bottom end of the side surface of the base toward the outside.

この構成によれば、基板実装面と接触する面積を多く取ることができる端子部が得られる。   According to this structure, the terminal part which can take much area which contacts a board | substrate mounting surface is obtained.

参考例の面実装型トランスは、ドラム状のコアと、該コアの外周面に巻線されたコイルと、前記コアの下端に設けられた絶縁性の基台と、該基台から水平方向に突出されている複数のリード端子とを備え、前記コイルのリード部を対応する前記リード端子に絡げてなる面実装型トランスにおいて、対向する２つの内側面にそれぞれねじ部を有するシールドケースと、前記コイルを収容すべく該コイルの直径よりも大きな内径で、また外周面には前記シールドケースのねじ部と螺合するねじを有して、前記コイルの外周を覆って配設され、前記角形シールドケース内で進退出して前記コイルのインダクタンスを可変する円筒状の可動コアとを備えるとともに、前記リード端子を、基板実装面に半田付けされる端子部と、該端子部よりも上方に位置し、かつ前記コイルのリード部を絡げる端末処理部とで構成し、前記端子部と前記端末処理部との間を前記基台に固定してなる。   The surface mount transformer of the reference example includes a drum-shaped core, a coil wound around the outer peripheral surface of the core, an insulating base provided at the lower end of the core, and a horizontal direction from the base. A shield case having a plurality of projecting lead terminals and having a threaded portion on each of two opposing inner surfaces in a surface mount transformer in which the lead portion of the coil is entangled with the corresponding lead terminal; An inner diameter larger than the diameter of the coil to accommodate the coil, and a screw threadedly engaged with a screw portion of the shield case on the outer peripheral surface, is disposed to cover the outer periphery of the coil, and A cylindrical movable core that moves forward and backward in the shield case to vary the inductance of the coil, and the lead terminal is soldered to the board mounting surface, and is positioned above the terminal portion. And, and constituted by the lead portion of Karageru terminal processing section of the coil, formed of a fixed between said terminal portion and the terminal processing unit in the base.

この構成によれば、基板実装面に半田付けされる端子部とコイルのリード部を絡げる端末処理部とを分離した構造にしているので、巻線切断時における巻線張力は、端子部に直接加わることがない。したがって、コイルのリード部の絡げ処理時に、端子部に不要な曲がりが生じない。   According to this configuration, since the terminal part soldered to the board mounting surface and the terminal processing part entwining the lead part of the coil are separated, the winding tension at the time of winding cutting is the terminal part. There is no direct participation. Therefore, unnecessary bending does not occur in the terminal portion during the binding process of the coil lead portion.

また、端子部側からの外力も、端末処理部には直接加わることがない。したがって、端子部側に変形が発生しても、コイルのリード部に不要な力が加わることもない。仮に外力が加わっても巻線緩み部により応力が逃げる為、断線に至らない。また防水用樹脂封止材を充填されても巻線緩み部の為に巻線引き回し部にはんだが付着しない為、強度に劣化がなく、断線に防止することが出来る。   Further, external force from the terminal part side is not directly applied to the terminal processing part. Therefore, even if the terminal portion is deformed, unnecessary force is not applied to the lead portion of the coil. Even if an external force is applied, the stress escapes due to the loosened part of the winding, so no disconnection occurs. Moreover, even if it is filled with a waterproof resin sealing material, the solder does not adhere to the winding lead portion due to the loose winding portion, so that the strength is not deteriorated and disconnection can be prevented.

さらに、角形シールドケース内で、可動コアを回転させつつ進退させることにより、所望のインダクタンスを得ることができる。   Furthermore, a desired inductance can be obtained by moving the movable core back and forth while rotating it in the square shield case.

参考例の面実装型トランスは、上記端末処理部を、巻線のリード部をはんだ絡げをする絡げ部と、はんだが巻線引き回し部に付かない巻き線緩み部にて構成している。   In the surface mount type transformer of the reference example, the above-mentioned terminal processing part is configured by a binding part for soldering the lead part of the winding and a winding loose part where the solder does not adhere to the winding lead part. .

参考例の面実装型トランスは、上記シールドケースを、内側のシールドケース部と外側のシールドケース部とを嵌合させた二重の構造にし、内側のシールドケース部に前記ねじ部を設けてなる。   In the surface mount type transformer of the reference example, the shield case is formed into a double structure in which the inner shield case portion and the outer shield case portion are fitted, and the screw portion is provided on the inner shield case portion. .

この構成によれば、内側と外側の二重のシールド構造により、良好な磁気シールドが得られる。   According to this configuration, a good magnetic shield can be obtained by the double shield structure of the inner side and the outer side.

本発明または参考例の面実装型トランスは、巻線のリード部の絡げ処理時に、端子部に不要な曲を発生させることがないので、基板実装面への半田付け処理を確実に行うことができ、信頼性の向上が図れる。また、端子部側からの外力も端末処理部に直接加わることがないので、端子部側に変形が生じても、巻線のリード部に不要な力が生ずることもなく、リード部の疲労断線をなくすことができ、信頼性の向上が図れる。   The surface mount type transformer of the present invention or the reference example does not cause unnecessary bending in the terminal part during the winding process of the winding lead part, so the soldering process to the board mounting surface must be performed reliably. And reliability can be improved. Also, since external force from the terminal part side is not directly applied to the terminal processing part, even if deformation occurs on the terminal part side, unnecessary force does not occur in the lead part of the winding, and fatigue breakage of the lead part The reliability can be improved.

本発明または参考例の面実装型トランスは、基板実装面に対して、端子部の接触面積を大きくすることができるので、より確実な半田付けが可能になり、信頼性の向上が図れる。また、端子部を水平直線状に形成することができるので、リード端子の製造を簡単にすることができる。したがって、さらに信頼性及び経済性を向上させることができる。   In the surface-mount transformer of the present invention or the reference example, the contact area of the terminal portion can be increased with respect to the board mounting surface, so that more reliable soldering is possible and the reliability can be improved. In addition, since the terminal portion can be formed in a horizontal straight line, the manufacture of the lead terminal can be simplified. Therefore, reliability and economy can be further improved.

本発明または参考例の面実装型トランスは、コイルのリード部の絡げ処理時に、端子部に不要な曲がりを生じさせることがないので、基板実装面への半田付け処理を確実に行うことができ、信頼性の向上が図れる。また、端子部側からの外力も端末処理部に直接加わることがないので、端子部側に変形が生じても、コイルのリード部に不要な力を発生させることもなく、リード部の疲労断線をなくすことができ、信頼性の向上が図れる。さらに、可動コアを回転させつつ進退させることにより、所望のインダクタンスを安定的に得ることができる。   The surface mount type transformer of the present invention or the reference example does not cause unnecessary bending in the terminal portion during the binding process of the coil lead portion, so that the soldering process to the board mounting surface can be reliably performed. And reliability can be improved. Also, since external force from the terminal part side is not directly applied to the terminal processing part, even if deformation occurs on the terminal part side, unnecessary force is not generated in the lead part of the coil, and fatigue breakage of the lead part The reliability can be improved. Furthermore, desired inductance can be stably obtained by advancing and retracting the movable core while rotating.

本発明または参考例の面実装型トランスは、巻き緩み部追加により外力に強くなるので、防水用樹脂封止材等により巻線引き回し部、又は絡げ部に仮に外力が加わっても断線に強く、コーナセンサーの様にバンパー等の使用環境の悪い場所での使用でも良好の品質を確保することが出来る。   The surface mount type transformer of the present invention or the reference example is strong against external force by adding a winding loose part, so it is strong against disconnection even if an external force is applied to the winding lead part or the binding part by a waterproof resin sealing material or the like. Good quality can be ensured even when used in a poor environment such as a bumper, such as a corner sensor.

本発明または参考例の面実装型トランスは、内側のシールドケース部と外側のシールドケース部との、二重のシールド構造により、良好な磁気シールドが得られるので、磁気シールドが安定的に得られる効果が期待できる。   In the surface mount type transformer of the present invention or the reference example, a good magnetic shield can be obtained by the double shield structure of the inner shield case portion and the outer shield case portion, so that the magnetic shield can be stably obtained. The effect can be expected.

本発明の一実施形態に係る面実装型トランスの上面図。1 is a top view of a surface-mount transformer according to an embodiment of the present invention. 同上面実装型トランスの一部切載側断面図。The partially cut-away side sectional view of the same top surface mounted transformer. 同上面実装型トランスの底面図。The bottom view of the same top surface mounting type | mold transformer. 同上面実装型トランスで使用しているリード端子の拡大斜視図。The expansion perspective view of the lead terminal currently used with the same top surface mounting type transformer. 従来の面実装型トランスの一例を示す上面図。The top view which shows an example of the conventional surface mount type | mold transformer. 同上従来トランスの側面図。The side view of a conventional transformer same as the above. 同上従来トランスのリード端子とリード部との絡げ構造を示す拡大斜視図。The expansion perspective view which shows the binding structure of the lead terminal and lead part of a conventional transformer same as the above.

以下、本発明の面実装型トランスについて、好適な実施例をあげて説明する。巻線の端部の疲労断線をなくして信頼性を向上させるとともに、リード端子の不要な曲がりを防止して、基板実装面への半田付けを確実に行うことができるようにするという目的を達成するために、巻線が施された巻枠体を支持している絶縁性の基台から水平方向に突出されている複数のリード端子に、前記巻線のリード部を絡げてなる面実装型トランスにおいて、前記リード端子を、基板実装面に半田付けされる端子部と、該端子部よりも上方に位置し、かつ前記巻線のリード部を絡げる端末処理部とで構成し、前記端子部と前記端末処理部との間を前記基台に固定するようにして実現した。   Hereinafter, the surface mount type transformer of the present invention will be described with reference to preferred embodiments. Achieves the goal of improving reliability by eliminating fatigue breaks at the ends of the windings and preventing unnecessary bending of the lead terminals to ensure soldering to the board mounting surface In order to achieve this, surface mounting is achieved by linking the lead portions of the windings to a plurality of lead terminals protruding in a horizontal direction from an insulating base supporting the winding frame body on which the windings are applied. In the type transformer, the lead terminal is composed of a terminal portion soldered to the board mounting surface, and a terminal processing portion that is located above the terminal portion and entangles the lead portion of the winding, This was realized by fixing between the terminal unit and the terminal processing unit to the base.

図１〜図３は本発明に係る面実装型トランスを示すもので、図１はその上面図、図２は一部切載側断面図、図３は底面図である。   1 to 3 show a surface mount transformer according to the present invention. FIG. 1 is a top view thereof, FIG. 2 is a partially cut-away side sectional view, and FIG. 3 is a bottom view.

図１〜図３において、面実装型トランス１１は、基台１２と固定コア１３とコイル１４と可動コア１５、及び角形シールドケース１６とで構成されている。   1 to 3, the surface-mount transformer 11 includes a base 12, a fixed core 13, a coil 14, a movable core 15, and a square shield case 16.

基台１２は、液晶ポリマー等の熱可塑性絶縁樹脂で概略扁平四角形状に成形されている。また、その成形時に、上面に固定コア取付孔１７を設けるとともに、４つのリード端子１８，１８…をインサートし、左右の両側面から各々２つのリード端子１８，１８が外側に向かって水平に突出した状態にして設けている。   The base 12 is formed in a generally flat rectangular shape with a thermoplastic insulating resin such as a liquid crystal polymer. Further, at the time of molding, a fixed core mounting hole 17 is provided on the upper surface, and four lead terminals 18, 18... Are inserted, and the two lead terminals 18, 18 protrude horizontally outward from the left and right side surfaces, respectively. It is provided in the state.

リード端子１８は、リン青銅であり、図４に示すように、互いに同じ方向に向かって平行に延びる端子部１８ａ及び端末処理部１８ｂと、該端子部１８ａと端末処理部１８ｂとの一端側を互いに連結している連結部１８ｃとを一体に設け、概略コの字形状に形成されている。また、連結部１８ｃの略中間部位１８ｄは、上下方向に折り曲げられ、この折り曲げによって端子部１８ａと端末処理部１８ｂとの位置を互いに上下にずらしている。このずれ量は、後述するコイル１４の絡げ部１４ａ、巻き緩み部１４ｂの絡げ高さを十分吸収できる量であって、図２に示すように、面実装型トランス１１を電子回路基板１９上に実装させたときに、絡げ部１４ａ、巻き緩み部１４ｂが基板実装面と接触しないようにすることができる量である。   The lead terminal 18 is made of phosphor bronze, and as shown in FIG. 4, a terminal portion 18a and a terminal processing portion 18b extending in parallel in the same direction, and one end sides of the terminal portion 18a and the terminal processing portion 18b are connected to each other. The connecting portions 18c that are connected to each other are integrally provided, and are formed in a substantially U-shape. Further, the substantially intermediate portion 18d of the connecting portion 18c is bent in the vertical direction, and the positions of the terminal portion 18a and the terminal processing portion 18b are shifted up and down by this bending. This deviation amount is an amount that can sufficiently absorb the entangled heights of the binding portion 14a and the winding loose portion 14b of the coil 14, which will be described later, and as shown in FIG. This is an amount that can prevent the binding portion 14a and the loosened winding portion 14b from coming into contact with the board mounting surface when mounted on the board.

そして、この各リード端子１８は、図１及び図３に示すように、端子部１８ａを外側、端末処理部１８ｂを内側とし、かつ、図２に示すように、端子部１８ａが端末処理部１８ｂよりも下側で、また端子部１８ａが基台１２の最下端部に配置されて、端子部１８ａの下面が基台１２の底面に露出した状態で、各端子部１８ａと端末処理部１８ｂとが基台２の側面からそれぞれ外側に向かって水平方向に突出して設けられている。   As shown in FIGS. 1 and 3, each lead terminal 18 has the terminal portion 18a on the outside and the terminal processing portion 18b on the inside, and as shown in FIG. 2, the terminal portion 18a becomes the terminal processing portion 18b. The terminal portion 18a is disposed at the lowermost end of the base 12 and the lower surface of the terminal portion 18a is exposed on the bottom surface of the base 12, and the terminal portions 18a and the terminal processing portions 18b Are provided so as to protrude in the horizontal direction from the side surface of the base 2 toward the outside.

固定コア１３は、ニッケル系フェライトコアで、ドラム状に形成されており、図２に示すように、下端側の突出部１３ａを基台１２の固定コア取付孔１７に嵌合させ、かつ接着剤で基台１２に固定することにより、基台１２上に立設した状態にして取り付けられている。この固定コア１３は巻枠体の機能を有しているものであって、該固定コア１３の外周面には、巻線が施されて上記コイル１４が形成されており、コイル１４から引き出された４つのリード部１４ａ，１４ａ…は、それぞれ対応するリード端子１８の端末処理部１８ｂに絡げられ、かつ端末処理部１８ｂと半田付けされている。   The fixed core 13 is a nickel-based ferrite core, and is formed in a drum shape. As shown in FIG. 2, the protruding portion 13 a on the lower end side is fitted into the fixed core mounting hole 17 of the base 12, and an adhesive is used. By fixing to the base 12, it is attached in a state standing on the base 12. The fixed core 13 has a function of a winding frame, and the coil 14 is formed on the outer peripheral surface of the fixed core 13 by winding. The coil 14 is drawn out from the coil 14. The four lead portions 14a, 14a,... Are entangled with the terminal processing portion 18b of the corresponding lead terminal 18 and soldered to the terminal processing portion 18b.

可動コア１５は、ニッケル系フェライトコアで、固定コア１３と共にコイル１４を収容すべく、コイル１４の直径よりも大きな内径で、上面が閉塞され、下面側が開口された、カップ形状をした筒体として作られており、外周面にはねじ２１が形成されている。また、上面には、図１に示すように、十字溝２２を設けている。   The movable core 15 is a nickel-based ferrite core, and is a cup-shaped cylinder having an inner diameter larger than the diameter of the coil 14, the upper surface closed, and the lower surface side opened to accommodate the coil 14 together with the fixed core 13. The screw 21 is formed on the outer peripheral surface. Further, as shown in FIG. 1, a cross groove 22 is provided on the upper surface.

角形シールドケース１６は、銅合金製であり、上面が閉じられ、下面が開口された、四角柱状をした筒体であり、内部に可動コア１５を収容すべく、該可動コア１５の直径よりも大きな内径で形成されている。また、上面には、可動コア１５の十字溝２２に、ドライバー等の工具を当てるための丸孔２３を設けている。その角形シールドケース１６は、内側のシールドケース部１６Ａと、この内側のシールドケース部１６Ａを収容してなる外側
のシールドケース部１６Ｂとで、二重構造にし、１つのケースとして作られている。 The square shield case 16 is made of a copper alloy, and is a rectangular column-shaped cylinder whose upper surface is closed and whose lower surface is opened. In order to accommodate the movable core 15 therein, the rectangular shield case 16 is larger than the diameter of the movable core 15. It is formed with a large inner diameter. Further, a round hole 23 for applying a tool such as a screwdriver to the cross groove 22 of the movable core 15 is provided on the upper surface. The rectangular shield case 16 is formed as a single case with a double structure including an inner shield case portion 16A and an outer shield case portion 16B accommodating the inner shield case portion 16A.

また、内側のシールドケース部１６Ａの対向し合っている左右の内面には、可動コア１５のねじ２１と螺合すべき、ねじ部２４，２４が形成されている。   Further, on the left and right inner surfaces of the inner shield case portion 16A facing each other, screw portions 24 and 24 to be screwed with the screw 21 of the movable core 15 are formed.

以上のように構成されている本実施例は、以下のようにして組み立てられる。   The present embodiment configured as described above is assembled as follows.

まず、上記角形シールドケース１６に、図２に示すように、その下方開口から可動コア１５を挿入する。可動コア１５は、外周にねじ２１が設けられていることから、可動コア１５を回転させながら挿入すると、内側のシールドケース部１６Ａに設けられているねじ部２４，２４とが噛合し、可動コア１５が角形シールドケース１６内で保持される。   First, as shown in FIG. 2, the movable core 15 is inserted into the rectangular shield case 16 from its lower opening. Since the movable core 15 is provided with screws 21 on the outer periphery, when the movable core 15 is inserted while rotating, the screw portions 24 and 24 provided on the inner shield case portion 16A mesh with each other, and the movable core 15 is engaged. 15 is held in the square shield case 16.

次いで、可動コア１５内に、その下方開口からコイル１４と固定コア１３とを収容すべく、角形シールドケース１６を被せ、図３に示すように、外側のシールドケース部１６Ｂの下端に設けられている係止爪２５を基台１２の側面に設けられている係止溝２６に係合させると、角形シールドケース１６が基台１２に固定され、組立が完了する。   Next, a rectangular shield case 16 is placed in the movable core 15 to accommodate the coil 14 and the fixed core 13 from the lower opening thereof, and is provided at the lower end of the outer shield case portion 16B as shown in FIG. When the engaging claw 25 is engaged with the engaging groove 26 provided on the side surface of the base 12, the rectangular shield case 16 is fixed to the base 12 and the assembly is completed.

このように構成された面実装型トランス１１は、角形シールドケース１６の上面に設けられている丸穴２３からプラスドライバー等の工具を差し込み、該工具の先端を可動コア１５の十字溝２２に係合させ、該可動コア１５を回転させると、可動コア１５が上下方向に進退出して所望のインダクタンスを得ることができる。   The surface mount transformer 11 configured as described above inserts a tool such as a Phillips screwdriver from a round hole 23 provided on the upper surface of the square shield case 16, and engages the tip of the tool with the cross groove 22 of the movable core 15. When the movable core 15 is rotated, the movable core 15 can move forward and backward in the vertical direction to obtain a desired inductance.

また、電子回路基板６への実装時には、該電子回路基板６上に配置されると、端子部１８ａが電子回路基板６の図示せぬ導体部と接触し、さらにリフロー半田等の処理を施すと、端子部１８ａが導体部に半田付けされて、電子回路基板６の実装面に取り付けられる。   Further, when the electronic circuit board 6 is mounted, if it is disposed on the electronic circuit board 6, the terminal part 18a comes into contact with a conductor part (not shown) of the electronic circuit board 6 and further subjected to processing such as reflow soldering. The terminal portion 18a is soldered to the conductor portion and attached to the mounting surface of the electronic circuit board 6.

以上述べたように、本実施の形態による面実装型トランス１によれば、基板実装面に半田付けされる端子部１８ａとコイル１４の絡げ部１４ａ、巻き緩み部１４ｂを端末処理部１８ｂとを分離させた構造にしているので、巻線切断時の巻線張力は、端子部１８ａに直接に加わることがなく、コイル１４のリード部１４ａの絡げ処理時に、端子部１８ａに不要な曲がりが生じない。また、端子部１８ａ側からの外力も端末処理部１８ｂには直接加わらない。したがって、端子部１８ａ側に変形が生じても、コイル１４の絡げ部１４ａ、巻き緩み部１４ｂには不要な力が生じない。仮に１８ｂに外力が加わっても巻き緩み部１４ｂによりリード部に緩み構造が有る為、外力が加わらず断線しない構造である。   As described above, according to the surface-mount transformer 1 according to the present embodiment, the terminal portion 18a soldered to the board mounting surface, the binding portion 14a of the coil 14, and the winding loosening portion 14b are connected to the terminal processing portion 18b. Therefore, the winding tension at the time of cutting the winding is not directly applied to the terminal portion 18a, and an unnecessary bending is not applied to the terminal portion 18a during the binding process of the lead portion 14a of the coil 14. Does not occur. Further, the external force from the terminal portion 18a side is not directly applied to the terminal processing portion 18b. Therefore, even if deformation occurs on the terminal portion 18a side, unnecessary force does not occur in the binding portion 14a and the loosened portion 14b of the coil 14. Even if an external force is applied to 18b, the lead portion is loosened by the loosened portion 14b. Therefore, the external force is not applied and the wire is not disconnected.

さらに、角形シールドケース１６内で、可動コア１５を回転させつつ進退させることにより、所望のインダクタンスを得ることができる。   Furthermore, a desired inductance can be obtained by moving the movable core 15 forward and backward while rotating in the square shield case 16.

また、角形シールドケース１６を内側のシールドケース部１６Ａと外側のシールドケース部１６Ｂとの二重のシールド構造にしているので、良好な磁気シールドが得られる。   Further, since the square shield case 16 has a double shield structure of the inner shield case portion 16A and the outer shield case portion 16B, a good magnetic shield can be obtained.

なお、本発明は、本発明の精神を逸脱しない限り種々の改変を為すことができ、そして、本発明が該改変されたものに及ぶことは当然である。   It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

１１ 面実装型トランス
１２ 基台
１３ 固定コア(巻枠本体)
１４ コイル
１４ａ 絡げ部
１４ｂ 巻き緩み部
１５ 可動コア
１６ 角形シールドケース
１７ 固定コア取付孔
１８ リード端子
１８ａ 端子部
１８ｂ 端末処理部
１８ｃ 連結部
１８ｄ 中間部位
１９ 電子回路基板
２１ ねじ
２２ 十字溝
２３ 丸孔
２４ ねじ部
２５ 係止爪
２６ 係止溝 11 Surface Mount Type Transformer 12 Base 13 Fixed Core (Reel Body)
14 Coil 14a Tying part 14b Unwinding part 15 Movable core 16 Square shield case 17 Fixed core mounting hole 18 Lead terminal 18a Terminal part 18b Terminal processing part 18c Connection part 18d Intermediate part 19 Electronic circuit board 21 Screw 22 Cross groove 23 Round hole 24 Screw part 25 Locking claw 26 Locking groove

Claims (4)

コイルと、該コイルが固定される絶縁性の基台と、該コイルと接続されるとともに基板実装面に半田付けされるリード端子とを備えたトランスと、
前記トランスを収容する内側シールドケース部と、
前記内側シールドケース部を収容する外側シールドケース部と
を備えることを特徴とする面実装型トランス。 A transformer including a coil, an insulating base on which the coil is fixed, and a lead terminal connected to the coil and soldered to the board mounting surface;
An inner shield case for accommodating the transformer;
A surface mount type transformer comprising: an outer shield case portion that accommodates the inner shield case portion. 前記トランスは、外周面に前記コイルが巻線された第１コアを備えることを特徴とする面実装トランス。   The transformer includes a first core having the coil wound around an outer peripheral surface thereof. 前記コイルの外周と前記内側シールドケース部の内周面の間に配置された第２コアを更に備えることを特徴とする請求項２に記載の面実装型トランス。   The surface-mount transformer according to claim 2, further comprising a second core disposed between an outer periphery of the coil and an inner peripheral surface of the inner shield case part. 前記内側シールドケース部の前記内周面に形成された第１ねじ部と、
前記第２コアの外周面に形成され前記ネジ部と螺合する第２ねじ部とを更に備え、
前記第２コアは前記第１ねじ部と前記第２ねじ部により前記内側シールドケース内で可動とされていることを特徴とする請求項３に記載の面実装型トランス。 A first screw portion formed on the inner peripheral surface of the inner shield case portion;
A second screw portion formed on the outer peripheral surface of the second core and screwed with the screw portion;
The surface-mount transformer according to claim 3, wherein the second core is movable in the inner shield case by the first screw portion and the second screw portion.
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CN113035553A (en) * 2021-03-26 2021-06-25 四川长虹电子部品有限公司 Method for improving corrosion resistance and production efficiency of pin transformer

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JP2019516246A (en) * 2016-04-20 2019-06-13 ヴィシェイ デール エレクトロニクス エルエルシー Shielding inductor and manufacturing method
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