JP2014123627A - Transformer and mounting structure of the same - Google Patents

Transformer and mounting structure of the same Download PDF

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JP2014123627A
JP2014123627A JP2012278526A JP2012278526A JP2014123627A JP 2014123627 A JP2014123627 A JP 2014123627A JP 2012278526 A JP2012278526 A JP 2012278526A JP 2012278526 A JP2012278526 A JP 2012278526A JP 2014123627 A JP2014123627 A JP 2014123627A
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core
transformer
cover
lead
bobbin
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Toshiyuki Watanabe
俊之 渡邉
Takashi Takeya
隆司 武谷
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Shindengen Electric Manufacturing Co Ltd
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Shindengen Electric Manufacturing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing costs of a transformer mounted on a circuit board, improve the manufacturing efficiency, and downsize the product including a structure where the transformer is mounted on the circuit board.SOLUTION: A transformer 1 includes: a core 5; a primary coil 3; a secondary coil 4; and an insulative bobbin 2 into which the core 5 is inserted, the insulative bobbin 2 around which the first coil 3 and the secondary coil 4 are wound. A part of a bottom surface of the core 5, which faces a mounting surface 100a of a circuit board 100, and a cover wall part 10 covering a part of a side surface of the core 5, which is located adjacent to the bottom surface, are integrally formed with the bobbin 2.

Description

この発明は、トランス及びトランスの実装構造に関する。   The present invention relates to a transformer and a mounting structure of the transformer.

従来より、トランスを回路基板に実装する構造では、配線パターンや各種電気部品によって回路基板上に形成される回路とトランスのコアとの間で、安全規格に準じた絶縁距離を確保する必要がある。
従来では、例えば特許文献１のように、低電圧回路の導電経路となるコアと高電圧回路との絶縁距離を確保するために、トランスを絶縁性の収納ケース内に収納すると共に、トランスの高電圧側のコイルを収納ケースの上方開口部から外側に導出した上で、収納ケースの外側の下部に設けられた高電圧側端子に接続する構造が開示されている。 Conventionally, in a structure in which a transformer is mounted on a circuit board, it is necessary to ensure an insulation distance conforming to safety standards between the circuit formed on the circuit board by a wiring pattern or various electrical components and the core of the transformer. .
Conventionally, as in Patent Document 1, for example, in order to secure an insulation distance between a core serving as a conductive path of a low-voltage circuit and a high-voltage circuit, the transformer is housed in an insulating housing case, and the transformer A structure is disclosed in which a voltage-side coil is led out from an upper opening of a storage case and then connected to a high-voltage side terminal provided at a lower portion outside the storage case.

特開２００８−２５８２５０号公報JP 2008-258250 A

しかしながら、トランスを収納ケース内に収納した上記従来の構造では、収納ケースの分だけ部品点数が増えるため、製造コストが高い、また、製造効率が低い、という問題がある。
さらに、トランスを収納ケース内に収容した構造は、トランスよりも一回り大きくなるため、回路基板におけるトランスの実装領域や実装高さを小さく抑えることができない。したがって、回路基板にトランスを実装した構造を含む製品の小型化に限界が生じる。 However, the above-described conventional structure in which the transformer is stored in the storage case has a problem that the number of parts increases by the amount of the storage case, so that the manufacturing cost is high and the manufacturing efficiency is low.
Furthermore, since the structure in which the transformer is housed in the housing case is one size larger than the transformer, the transformer mounting area and mounting height on the circuit board cannot be kept small. Therefore, there is a limit to downsizing products including a structure in which a transformer is mounted on a circuit board.

本発明は、上述した事情に鑑みたものであって、製造コストの削減及び製造効率の向上を図ることができると共にトランスを含む製品の小型化も可能なトランス及びトランスの実装構造を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and provides a transformer and a transformer mounting structure that can reduce the manufacturing cost and improve the manufacturing efficiency and can reduce the size of a product including the transformer. With the goal.

この課題を解決するために、本発明のトランスは、コアと、一次巻線と、二次巻線と、前記コアを挿入して前記一次巻線及び前記二次巻線を巻きつける絶縁性のボビンとを備え、回路基板に実装されるトランスであって、前記ボビンに、前記回路基板の実装面に対向する前記コアの底面の一部、及び、前記底面に隣り合う前記コアの側面の一部を覆うカバー壁部が一体に形成されていることを特徴とする。   In order to solve this problem, a transformer of the present invention includes a core, a primary winding, a secondary winding, and an insulating material that inserts the core and winds the primary winding and the secondary winding. A transformer mounted on a circuit board, wherein the bobbin includes a part of a bottom surface of the core facing the mounting surface of the circuit board and a side surface of the core adjacent to the bottom surface. The cover wall part which covers a part is formed integrally.

また、本発明のトランスの実装構造は、前記トランスを前記回路基板の実装面に実装した構造である。   The transformer mounting structure of the present invention is a structure in which the transformer is mounted on a mounting surface of the circuit board.

そして、前記トランスでは、前記一次巻線及び前記二次巻線の引出配線が、前記実装面に沿って前記コアから互いに離間する方向に引き出され、前記カバー壁部が、少なくとも前記コアの底面及び側面のうち前記一次巻線及び前記二次巻線のいずれか一方の引出配線側の領域を覆うと好ましい。   In the transformer, the lead wires of the primary winding and the secondary winding are drawn out in a direction away from the core along the mounting surface, and the cover wall portion includes at least the bottom surface of the core and the core It is preferable to cover a region on the lead wiring side of either the primary winding or the secondary winding on the side surface.

また、前記トランスでは、前記カバー壁部が、前記一方の引出配線側の領域のうち、前記実装面に沿って前記引出配線の引出方向に直交する前記コアの幅方向の両端部をなす一対の側面の一部を覆う一対の側部カバー部を備えるとよい。   In the transformer, the cover wall portion includes a pair of end portions in the width direction of the core perpendicular to the lead-out direction of the lead-out line along the mounting surface in the region on the one lead-out wiring side. It is good to provide a pair of side part cover part which covers a part of side surface.

さらに、前記トランスでは、前記側部カバー部が、前記一方の引出配線の引出方向側に位置する前記コアの端部よりも、前記一方の引出配線の引出方向に延出しているとよい。   Further, in the transformer, it is preferable that the side cover portion extends in a drawing direction of the one lead-out wiring from an end portion of the core located on the lead-out direction side of the one lead-out wiring.

また、前記トランスでは、前記カバー壁部が、前記一方の引出配線側の領域のうち、前記引出配線の引出方向に直交する前記コアの側面を覆う端部カバー部を備えるとよい。   In the transformer, it is preferable that the cover wall portion includes an end cover portion that covers a side surface of the core orthogonal to a lead-out direction of the lead-out wiring in the region on the one lead-out wiring side.

さらに、前記トランスでは、前記ボビンの軸線方向が前記実装面に平行するように構成され、前記カバー壁部が、前記ボビンの軸線方向に直交する前記コアの側面を覆うように形成されていてもよい。   Further, the transformer may be configured such that an axial direction of the bobbin is parallel to the mounting surface, and the cover wall portion is formed so as to cover a side surface of the core perpendicular to the axial direction of the bobbin. Good.

また、前記トランスでは、前記カバー壁部が、前記ボビンのうち前記一次巻線及び前記二次巻線を巻き付ける筒状部の軸線方向の端部に対し、前記ボビンの軸線方向に隣り合わせて配されているとよい。   Further, in the transformer, the cover wall portion is disposed adjacent to the axial end of the tubular portion around which the primary winding and the secondary winding of the bobbin are wound in the axial direction of the bobbin. It is good to have.

本発明によれば、トランスの製造コストの削減及び製造効率の向上を図ることができると共に、トランスを回路基板に実装した構造を含む製品の小型化も可能となる。   According to the present invention, it is possible to reduce the manufacturing cost of the transformer and improve the manufacturing efficiency, and it is also possible to reduce the size of the product including the structure in which the transformer is mounted on the circuit board.

本発明の第一実施形態に係るトランスを示す概略平面図である。1 is a schematic plan view showing a transformer according to a first embodiment of the present invention. 図１のＡ−Ａ矢視断面図である。It is AA arrow sectional drawing of FIG. 図１のトランスをＢ方向から見た概略側面図である。It is the schematic side view which looked at the transformer of Drawing 1 from the B direction. 図１のトランスを回路基板に実装した実装構造を示す概略平面図である。FIG. 2 is a schematic plan view showing a mounting structure in which the transformer of FIG. 1 is mounted on a circuit board. 図４のＢ−Ｂ矢視断面図である。It is a BB arrow sectional view of Drawing 4. 図４のＣ−Ｃ矢視断面図である。It is CC sectional view taken on the line of FIG. 本発明の第二実施形態に係るトランスを示す概略平面図である。It is a schematic plan view which shows the trans | transformer which concerns on 2nd embodiment of this invention. 図７のＤ−Ｄ矢視断面図である。It is DD sectional view taken on the line of FIG. 図７，８に示すトランスの一変形例を示す概略平面図である。FIG. 9 is a schematic plan view showing a modification of the transformer shown in FIGS.

〔第一実施形態〕
以下、図１〜６を参照して本発明の第一実施形態について説明する。
図１〜３に示すように、この実施形態に係るトランス１は、回路基板１００の実装面１００ａ（図４〜６参照）に実装されるものであり、ボビン２、一次巻線３、二次巻線４及びコア５を備えている。
ボビン２は、樹脂等の電気的な絶縁材料からなり、筒状部１１と、筒状部１１の軸線Ｌ１方向（Ｘ軸方向）の両端部に一体に形成された一対のフランジ部１２，１２と、を備えている。 [First embodiment]
The first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1-3, the transformer 1 according to this embodiment is mounted on a mounting surface 100a (see FIGS. 4-6) of a circuit board 100, and includes a bobbin 2, a primary winding 3, a secondary A winding 4 and a core 5 are provided.
The bobbin 2 is made of an electrically insulating material such as a resin, and a pair of flange portions 12 and 12 that are integrally formed with the cylindrical portion 11 and both ends of the cylindrical portion 11 in the direction of the axis L1 (X-axis direction). And.

一次巻線３及び二次巻線４は、ボビン２の筒状部１１に巻き付けられている。なお、図示例では、一次巻線３及び二次巻線４の巻付け部分が筒状部１１の軸線Ｌ１方向に配列されているが、これに限ることはない。
また、一次巻線３及び二次巻線４の引出配線３Ａ，４Ａは、コア５から互いに離間する方向に引き出される。本実施形態では、一次巻線３及び二次巻線４の引出配線３Ａ，４Ａの引出方向が、筒状部１１の軸線Ｌ１方向に平行している。また、本実施形態では、一次巻線３及び二次巻線４の引出配線３Ａ，４Ａがそれぞれ複数本ある。図示例では、一次巻線３の引出配線３Ａ（第一引出配線３Ａ）が六本、二次巻線４の引出配線４Ａ（第二引出配線４Ａ）が四本ある。そして、複数の第一引出配線３Ａ及び複数の第二引出配線４Ａは、それぞれ筒状部１１の軸線Ｌ１方向に直交する方向（Ｙ軸方向）に配列されている。そして、各引出配線３Ａ，４Ａの先端部は、ボビン２に固定された各端子１３に絡げられ、各端子１３に電気接続されている。 The primary winding 3 and the secondary winding 4 are wound around the cylindrical portion 11 of the bobbin 2. In the illustrated example, the winding portions of the primary winding 3 and the secondary winding 4 are arranged in the direction of the axis L1 of the cylindrical portion 11, but this is not restrictive.
Further, the lead wires 3 </ b> A and 4 </ b> A of the primary winding 3 and the secondary winding 4 are drawn from the core 5 in directions away from each other. In the present embodiment, the lead-out directions of the lead wires 3A and 4A of the primary winding 3 and the secondary winding 4 are parallel to the direction of the axis L1 of the cylindrical portion 11. In the present embodiment, there are a plurality of lead wires 3A, 4A for the primary winding 3 and the secondary winding 4, respectively. In the illustrated example, there are six lead wires 3A (first lead wires 3A) of the primary winding 3, and four lead wires 4A (second lead wires 4A) of the secondary winding 4. The plurality of first lead wires 3 </ b> A and the plurality of second lead wires 4 </ b> A are arranged in a direction (Y-axis direction) orthogonal to the direction of the axis L <b> 1 of the cylindrical portion 11. The leading ends of the lead wires 3 </ b> A and 4 </ b> A are entangled with the terminals 13 fixed to the bobbin 2 and are electrically connected to the terminals 13.

コア５は、磁性材料からなり、一次巻線３に通電した交流電流により主磁束を発生させ、この磁束に基づく電磁誘導により二次巻線４に電圧を誘起するものである。
本実施形態のコア５は、ボビン２の筒状部１１に挿通される棒状の挿通部２１と、挿通部２１の径方向外側に張り出すように配されて挿通部２１の両端を接続する外郭部２２と、を備える。外郭部２２は筒状部１１の外側に配され、外郭部２２の一部は筒状部１１の外周面に対向するように配される。また、本実施形態では、外郭部２２が挿通部２１から互いに逆向きに張り出すように一対形成されている。これら挿通部２１及び一対の外郭部２２，２２は、筒状部１１の軸線Ｌ１方向に直交する方向に配列されている。
以上のように構成される本実施形態のコア５は、二つのＥ型コアを組み合わせて構成されている。また、本実施形態のコア５は、一次側回路の導電経路となっている。 The core 5 is made of a magnetic material, generates a main magnetic flux by an alternating current supplied to the primary winding 3, and induces a voltage in the secondary winding 4 by electromagnetic induction based on the magnetic flux.
The core 5 of the present embodiment includes a rod-shaped insertion portion 21 that is inserted into the cylindrical portion 11 of the bobbin 2 and an outer shell that is arranged so as to project outward in the radial direction of the insertion portion 21 and connects both ends of the insertion portion 21. Unit 22. The outer portion 22 is disposed outside the tubular portion 11, and a part of the outer portion 22 is disposed so as to face the outer peripheral surface of the tubular portion 11. Further, in the present embodiment, a pair of outer shell portions 22 are formed so as to protrude in opposite directions from the insertion portion 21. The insertion portion 21 and the pair of outer portions 22 and 22 are arranged in a direction orthogonal to the direction of the axis L <b> 1 of the cylindrical portion 11.
The core 5 of the present embodiment configured as described above is configured by combining two E-type cores. Moreover, the core 5 of this embodiment is a conductive path of the primary side circuit.

そして、本実施形態のボビン２では、各フランジ部１２の外周縁のうち、筒状部１１の軸線Ｌ１方向（Ｘ軸方向）、並びに、挿通部２１及び一対の外郭部２２，２２の配列方向（Ｙ軸方向）の両方に直交する方向（Ｚ軸方向）の両端に、一対の鍔部１４，１５が形成されている。
一対の鍔部１４，１５は、各フランジ部１２に一体に形成され、筒状部１１から離間するようにＸ軸方向に延びている。すなわち、一対の鍔部１４，１５は、筒状部１１に対してその軸線Ｌ１方向の端部に隣り合わせて配されている。言い換えれば、一対の鍔部１４，１５は筒状部１１の外周面に対向する位置に配されていない。この一対の鍔部１４，１５は、コア５の外郭部２２をＺ軸方向から挟み込んで、ボビン２に取り付けられたコア５を支持する役割を果たしている。 And in the bobbin 2 of this embodiment, among the outer periphery of each flange part 12, the axial line L1 direction (X-axis direction) of the cylindrical part 11, and the arrangement | sequence direction of the insertion part 21 and a pair of outline parts 22 and 22 A pair of flanges 14 and 15 are formed at both ends in a direction (Z-axis direction) orthogonal to both (Y-axis direction).
The pair of flange portions 14 and 15 are formed integrally with each flange portion 12 and extend in the X-axis direction so as to be separated from the tubular portion 11. In other words, the pair of flange portions 14 and 15 are arranged adjacent to the end portion in the direction of the axis L <b> 1 with respect to the tubular portion 11. In other words, the pair of flange portions 14 and 15 are not arranged at positions facing the outer peripheral surface of the cylindrical portion 11. The pair of flange portions 14 and 15 serve to support the core 5 attached to the bobbin 2 by sandwiching the outer portion 22 of the core 5 from the Z-axis direction.

また、一方の鍔部１４は、他方の鍔部１５よりもＸ軸方向（引出配線３Ａ，４Ａの引出方向）に長く延びており、筒状部１１の軸線Ｌ１方向の各端部に位置するコア５の外郭部２２の底面を覆う底部カバー部１４となっている。ここで、外郭部２２の底面は、トランス１を回路基板１００に実装した状態で回路基板１００の実装面１００ａに対向する面を示している（図５参照）。
さらに、本実施形態では、各底部カバー部１４がコア５の幅方向（Ｙ軸方向）の両端部から突出するように幅広に形成されている。また、本実施形態では、第二引出配線４Ａの引出方向側に位置する第二底部カバー部１４Ｂが、第一引出配線３Ａの引出方向側に位置する第一底部カバー部１４ＡよりもＸ軸方向に長く延出している。 Further, the one flange portion 14 extends longer in the X-axis direction (the extraction direction of the lead-out wirings 3A and 4A) than the other flange portion 15, and is located at each end of the cylindrical portion 11 in the axis L1 direction. The bottom cover portion 14 covers the bottom surface of the outer shell portion 22 of the core 5. Here, the bottom surface of the outer shell 22 indicates a surface facing the mounting surface 100a of the circuit board 100 in a state where the transformer 1 is mounted on the circuit board 100 (see FIG. 5).
Furthermore, in this embodiment, each bottom cover part 14 is formed wide so as to protrude from both ends in the width direction (Y-axis direction) of the core 5. In the present embodiment, the second bottom cover portion 14B located on the lead-out direction side of the second lead-out wiring 4A is more in the X-axis direction than the first bottom cover portion 14A located on the lead-out direction side of the first lead-out wiring 3A. It extends for a long time.

前述した一次巻線３及び二次巻線４の各引出配線３Ａ，４Ａは、筒状部１１の軸線Ｌ１方向の各端部に位置する外郭部２２との間に上述した底部カバー部１４が挟み込まれるように配されている。
また、一次巻線３及び二次巻線４の引出配線３Ａ，４Ａを絡げる端子１３は、上述した各底部カバー部１４からＺ軸方向に突出するように各底部カバー部１４に固定されている。なお、本実施形態では、一次巻線３の引出配線３Ａを絡げる端子１３（一次側端子１３Ａ）が、コア５の外郭部２２とＺ軸方向に重なるように配されている。一方、二次巻線４の引出配線４Ａを絡げる端子１３（二次側端子１３Ｂ）は、コア５の外郭部２２からＸ軸方向に離間した位置に配されている。 Each of the lead wires 3A, 4A of the primary winding 3 and the secondary winding 4 described above is provided with the above-described bottom cover portion 14 between the outer portion 22 positioned at each end portion in the direction of the axis L1 of the cylindrical portion 11. It is arranged to be sandwiched.
Further, the terminals 13 for connecting the lead wires 3A, 4A of the primary winding 3 and the secondary winding 4 are fixed to the bottom cover portions 14 so as to protrude in the Z-axis direction from the bottom cover portions 14 described above. ing. In the present embodiment, the terminal 13 (primary side terminal 13A) that ties the lead wire 3A of the primary winding 3 is arranged so as to overlap the outer portion 22 of the core 5 in the Z-axis direction. On the other hand, the terminal 13 (secondary side terminal 13 </ b> B) that ties the lead-out wiring 4 </ b> A of the secondary winding 4 is arranged at a position separated from the outer portion 22 of the core 5 in the X-axis direction.

さらに、本実施形態のボビン２には、コア５の幅方向（Ｙ軸方向）の両端部をなす一対の側面５ｃ，５ｃの一部を覆う一対の側部カバー部１６，１６が一体に形成されている。本実施形態では、一対の側部カバー部１６，１６が第二底部カバー部１４Ｂの幅方向（Ｙ軸方向）の両端部に一体に形成されている。
また、本実施形態では、一対の側部カバー部１６，１６が筒状部１１に対してその軸線Ｌ１方向の端部に隣り合わせて配されている。すなわち、本実施形態における一対の側部カバー部１６，１６は筒状部１１の外周面に対向する位置に配されていない。これにより、本実施形態における一対の側部カバー部１６，１６は、ボビン２の筒状部１１よりも第二引出配線４Ａの引出方向側に位置するコア５の外郭部２２をなす一対の側面５ｃ，５ｃを覆っている。 Further, the bobbin 2 of the present embodiment is integrally formed with a pair of side cover portions 16 and 16 that cover a part of the pair of side surfaces 5c and 5c forming both ends of the core 5 in the width direction (Y-axis direction). Has been. In this embodiment, a pair of side cover parts 16 and 16 are integrally formed in the both ends of the width direction (Y-axis direction) of the 2nd bottom cover part 14B.
Moreover, in this embodiment, a pair of side cover parts 16 and 16 are distribute | arranged adjacent to the edge part of the axis line L1 direction with respect to the cylindrical part 11. As shown in FIG. That is, the pair of side cover portions 16 and 16 in the present embodiment are not arranged at positions facing the outer peripheral surface of the cylindrical portion 11. Accordingly, the pair of side cover portions 16 and 16 in the present embodiment are a pair of side surfaces that form the outer portion 22 of the core 5 that is located on the side of the second lead-out wiring 4 </ b> A with respect to the tubular portion 11 of the bobbin 2. 5c and 5c are covered.

さらに、本実施形態では、一対の側部カバー部１６，１６が、第二引出配線４Ａの引出方向側に位置するコア５の端部よりも、Ｘ軸方向に離間するように延出している。なお、図示例では、一対の側部カバー部１６，１６のＸ軸方向への延出長さが、第二底部カバー部１４Ｂと等しいが、例えば異なっていてもよい。
また、図示例では、第二底部カバー部１４ＢからＺ軸方向に突出する側部カバー部１６の突出高さが、コア５の高さよりも低く設定されているが、例えばコア５の高さ以上に設定されてもよい。 Furthermore, in this embodiment, a pair of side cover parts 16 and 16 are extended so that it may separate in the X-axis direction rather than the edge part of the core 5 located in the extraction direction side of 4 A of 2nd extraction wiring. . In the illustrated example, the extension length in the X-axis direction of the pair of side cover parts 16 and 16 is equal to that of the second bottom cover part 14B, but may be different, for example.
Moreover, in the example of illustration, although the protrusion height of the side part cover part 16 which protrudes in the Z-axis direction from the 2nd bottom part cover part 14B is set lower than the height of the core 5, it is more than the height of the core 5, for example May be set.

以上のように構成される本実施形態のボビン２では、上述した第二底部カバー部１４Ｂ及び一対の側部カバー部１６，１６によって、回路基板１００の実装面１００ａ（４〜６参照）に対向するコア５の底面の一部、及び、コア５の底面に隣り合うコア５の側面の一部を覆うカバー壁部１０が構成されている。また、本実施形態のカバー壁部１０は、コア５の底面及び側面のうち二次巻線４の引出配線４Ａ側（一方の引出配線側）の領域を覆っている。   In the bobbin 2 of the present embodiment configured as described above, the mounting surface 100a (see 4 to 6) of the circuit board 100 is opposed by the second bottom cover portion 14B and the pair of side cover portions 16 and 16 described above. The cover wall portion 10 is configured to cover a part of the bottom surface of the core 5 and a part of the side surface of the core 5 adjacent to the bottom surface of the core 5. Further, the cover wall portion 10 of the present embodiment covers the region on the lead wire 4A side (one lead wire side) of the secondary winding 4 on the bottom surface and side surface of the core 5.

さらに、本実施形態のボビン２には、各底部カバー部１４から側部カバー部１６，１６と反対側（Ｚ軸負方向）に突出する複数の脚部１８が形成されている。底部カバー部１４に対する複数の脚部１８の突出高さは、互いに等しくなっている。これら複数の脚部１８は、トランス１を回路基板１００に実装した状態おいて複数の脚部１８の先端が回路基板１００の実装面１００ａに当接することで、実装面１００ａからのボビン２の高さ位置を適正に保つ役割、及び、一次巻線３や二次巻線４の引出配線３Ａ，４Ａが回路基板１００の実装面１００ａに接触することを防ぐ役割を果たす（図５，６参照）。   Further, the bobbin 2 of the present embodiment is formed with a plurality of leg portions 18 protruding from the bottom cover portions 14 to the side opposite to the side cover portions 16 and 16 (Z-axis negative direction). The protruding heights of the plurality of leg portions 18 with respect to the bottom cover portion 14 are equal to each other. The plurality of leg portions 18 are configured such that the tips of the plurality of leg portions 18 abut on the mounting surface 100a of the circuit board 100 in a state where the transformer 1 is mounted on the circuit board 100, so that the height of the bobbin 2 from the mounting surface 100a is increased. The role of maintaining the proper position and the role of preventing the lead wires 3A, 4A of the primary winding 3 and the secondary winding 4 from contacting the mounting surface 100a of the circuit board 100 (see FIGS. 5 and 6). .

次に、図４〜６を参照して上記構成のトランス１を回路基板１００に実装した実装構造について説明する。
トランス１は、図４〜６に示すように、底部カバー部１４を回路基板１００の実装面１００ａに対向させた状態で底部カバー部１４に固定された端子１３を回路基板１００の配線パターン（不図示）に接合することで、回路基板１００の実装面１００ａに実装される。本実施形態では、端子１３を回路基板１００のスルーホール１０１に挿通させた上で、半田付け等により回路基板１００の配線パターンに接合される。また、本実施形態では、トランス１を回路基板１００に実装した状態において、筒状部１１の軸線Ｌ１方向が実装面１００ａに平行している。 Next, a mounting structure in which the transformer 1 having the above configuration is mounted on the circuit board 100 will be described with reference to FIGS.
As shown in FIGS. 4 to 6, the transformer 1 connects the terminal 13 fixed to the bottom cover part 14 with the bottom cover part 14 facing the mounting surface 100 a of the circuit board 100, as shown in FIG. It is mounted on the mounting surface 100a of the circuit board 100 by bonding to the figure. In the present embodiment, the terminal 13 is inserted into the through hole 101 of the circuit board 100 and then joined to the wiring pattern of the circuit board 100 by soldering or the like. In the present embodiment, in the state where the transformer 1 is mounted on the circuit board 100, the direction of the axis L1 of the cylindrical portion 11 is parallel to the mounting surface 100a.

回路基板１００上には、一次側の交流電流が流れる一次側回路、及び、二次側の交流電流が流れる二次側回路が形成されている。なお、図４，５における符号１０２、１０３は、それぞれ本実施形態における一次側回路の形成領域及び二次側回路の形成領域を示している。これら一次側回路の形成領域１０２と二次側回路の形成領域１０３とは、互いに間隔をあけて位置している。
一次側回路の形成領域１０２には、トランス１の一次巻線３に電気接続される一次側配線パターン（不図示）が形成され、また、一次側配線パターンに電気接続される一次側電気部品（不図示）が実装されている。すなわち、一次側回路は、これら一次側配線パターン及び一次側電気部品によって構成されている。そして、トランス１の一次側端子１３Ａは、平面視で一次側回路の形成領域１０２と重なるように配されている。 On the circuit board 100, a primary side circuit in which a primary side alternating current flows and a secondary side circuit in which a secondary side alternating current flows are formed. Reference numerals 102 and 103 in FIGS. 4 and 5 indicate a primary-side circuit formation region and a secondary-side circuit formation region in the present embodiment, respectively. The primary circuit forming region 102 and the secondary circuit forming region 103 are located at a distance from each other.
In the primary circuit formation region 102, a primary wiring pattern (not shown) electrically connected to the primary winding 3 of the transformer 1 is formed, and a primary electrical component (not shown) electrically connected to the primary wiring pattern ( (Not shown) is implemented. That is, the primary side circuit is constituted by these primary side wiring patterns and primary side electrical components. The primary terminal 13A of the transformer 1 is arranged so as to overlap with the primary circuit forming region 102 in plan view.

一方、二次側回路の形成領域１０３には、トランス１の二次巻線４に電気接続される二次側配線パターン（不図示）が形成され、また、二次側配線パターンに電気接続される二次側電気部品（他の電気部品）１０４が実装されている。二次側回路は、これら二次側配線パターン及び二次側電気部品１０４によって構成されている。なお、二次側電気部品１０４は、図６において一つだけ図示されているが、二次側回路の形成領域１０３の任意の箇所に複数実装されていてよい。
そして、トランス１の二次側端子１３Ｂは、平面視で二次側回路の形成領域１０３と重なるように配されている。 On the other hand, a secondary side wiring pattern (not shown) that is electrically connected to the secondary winding 4 of the transformer 1 is formed in the formation region 103 of the secondary side circuit, and is also electrically connected to the secondary side wiring pattern. A secondary-side electrical component (other electrical component) 104 is mounted. The secondary side circuit is constituted by these secondary side wiring patterns and the secondary side electrical component 104. Although only one secondary-side electrical component 104 is shown in FIG. 6, a plurality of secondary-side electrical components 104 may be mounted at any location in the secondary-side circuit formation region 103.
The secondary terminal 13B of the transformer 1 is arranged so as to overlap with the secondary circuit forming region 103 in plan view.

さらに、本実施形態では、平面視した二次側回路の形成領域１０３がカバー壁部１０によって覆われたコア５の一部とＺ軸方向に重なるように、また、コア５の一部の幅方向（Ｙ軸方向）に隣り合うように位置している。
具体的に説明すれば、本実施形態における二次側回路の形成領域１０３は、ボビン２の筒状部１１よりも第二引出配線４Ａの引出方向側に位置して第二底部カバー部１４Ｂによって覆われたコア５の外郭部２２の底面に対向するように位置している。また、本実施形態における二次側回路の形成領域１０３は、一対の側部カバー部１６によって覆われたコア５の外郭部２２の一対の側面５ｃ，５ｃに隣り合うように位置している。 Furthermore, in the present embodiment, the secondary-side circuit formation region 103 in plan view overlaps with a part of the core 5 covered with the cover wall 10 in the Z-axis direction, and the width of a part of the core 5 It is located adjacent to the direction (Y-axis direction).
More specifically, the secondary circuit formation region 103 in the present embodiment is located closer to the drawing direction of the second lead-out wiring 4A than the cylindrical portion 11 of the bobbin 2 and is formed by the second bottom cover portion 14B. It is located so as to face the bottom surface of the outer shell portion 22 of the covered core 5. In addition, the secondary circuit forming region 103 in the present embodiment is located adjacent to the pair of side surfaces 5 c and 5 c of the outer portion 22 of the core 5 covered by the pair of side cover portions 16.

なお、図４，５における符号１０３ｂは、トランス１がカバー壁部１０（特に一対の側部カバー部１６，１６）を備えない場合の二次側回路の形成領域を示している。この場合の二次側回路の形成領域１０３ｂは、本実施形態における二次側回路の形成領域１０３よりも第二引出配線４Ａの引出方向に離間するように位置している。   4 and 5, reference numeral 103 b indicates a secondary circuit forming region when the transformer 1 does not include the cover wall portion 10 (particularly, the pair of side cover portions 16 and 16). In this case, the secondary circuit formation region 103b is located farther in the lead-out direction of the second lead-out wiring 4A than the secondary circuit formation region 103 in the present embodiment.

以上説明したように、本実施形態のトランス１、及び、トランス１の実装構造によれば、コア５の底面及び側面のうち第二引出配線４Ａの引出方向側の領域が絶縁性を有するカバー壁部１０によって覆われるため、トランス１を回路基板１００に実装した状態において、回路基板１００上に形成された二次側回路とコア５との間にカバー壁部１０を介在させて、一次側回路の導電経路となっているコア５と二次側回路との絶縁距離を十分に延長することができる。
具体的に説明すれば、トランス１がカバー壁部１０（特に一対の側部カバー部１６，１６）を備えない場合には、一次側回路の導電経路となっているコア５と二次側回路との絶縁距離を確保するため、例えば図４，５に示すように二次側回路の形成領域１０３ｂをコア５から第二引出配線４Ａの引出方向に離間させる、あるいは、コア５を回路基板１００の実装面１００ａの上方に離間させる必要がある。 As described above, according to the transformer 1 and the mounting structure of the transformer 1 of the present embodiment, the cover wall in which the region on the lead-out direction side of the second lead-out wiring 4A out of the bottom surface and the side surface of the core 5 has insulating properties. Since the transformer 1 is mounted on the circuit board 100, the cover side wall 10 is interposed between the secondary circuit formed on the circuit board 100 and the core 5 so as to cover the primary circuit. The insulation distance between the core 5 serving as the conductive path and the secondary circuit can be sufficiently extended.
More specifically, when the transformer 1 does not include the cover wall portion 10 (particularly, the pair of side cover portions 16 and 16), the core 5 and the secondary side circuit serving as the conductive path of the primary side circuit. 4 and 5, for example, as shown in FIGS. 4 and 5, the secondary circuit forming region 103 b is separated from the core 5 in the lead-out direction of the second lead-out wiring 4 A, or the core 5 is separated from the circuit board 100. It is necessary to be spaced above the mounting surface 100a.

これに対し、本実施形態のようにトランス１がカバー壁部１０（特に一対の側部カバー部１６，１６）を備える場合には、例えば図６に示すように、二次側回路をなす二次側電気部品１０４がコア５の幅方向の側面５ｃに隣り合わせて配されても、側部カバー部１６が介在していることで、コア５と二次側電気部品１０４との絶縁距離を延長することができる。また、コア５の底面と二次側配線パターンとの間には第二底部カバー部１４Ｂが介在しているため、コア５と二次側配線パターンとの絶縁距離を延長することができる。   On the other hand, when the transformer 1 includes the cover wall portion 10 (particularly the pair of side cover portions 16 and 16) as in this embodiment, for example, as shown in FIG. Even if the secondary electrical component 104 is arranged adjacent to the side surface 5c in the width direction of the core 5, the insulation distance between the core 5 and the secondary electrical component 104 is extended by the interposition of the side cover portion 16. can do. Further, since the second bottom cover portion 14B is interposed between the bottom surface of the core 5 and the secondary side wiring pattern, the insulation distance between the core 5 and the secondary side wiring pattern can be extended.

さらに、本実施形態のトランス１では、一対の側部カバー部１６，１６が、第二引出配線４Ａの引出方向側に位置するコア５の端部よりもＸ軸方向に離間するように延出しているため、第二引出配線４Ａの引出方向側に位置して筒状部１１の軸線Ｌ１方向（Ｙ軸方向）に直交するコア５の側面５ｂが覆われていなくても、コア５と二次側回路との絶縁距離を延長することができる。   Further, in the transformer 1 of the present embodiment, the pair of side cover portions 16 and 16 extend so as to be separated in the X-axis direction from the end portion of the core 5 located on the lead-out direction side of the second lead-out wiring 4A. Therefore, even if the side surface 5b of the core 5 that is located on the drawing direction side of the second lead wiring 4A and is orthogonal to the direction of the axis L1 (Y-axis direction) of the cylindrical portion 11 is not covered, The insulation distance from the secondary circuit can be extended.

以上のように、カバー壁部１０によってコア５と二次側回路との絶縁距離を十分に確保できるため、図４，５に示すように、二次側回路の形成領域１０３をコア５から第二引出配線４Ａの引出方向に離間させたり、コア５を回路基板１００の実装面１００ａの上方に離間させたりせず、二次側回路の形成領域１０３をトランス１の実装領域に近づけて配する（隣り合せて配置する）ことが可能となる。したがって、トランス１や二次側電気部品１０４を回路基板１００の実装面１００ａに対して高密度に実装することが可能となり、回路基板１００にトランス１を実装した構造を含む製品の小型化を図ることができる。   As described above, the cover wall 10 can sufficiently secure the insulation distance between the core 5 and the secondary circuit, and therefore, as shown in FIGS. The secondary circuit forming region 103 is arranged close to the mounting region of the transformer 1 without being separated in the drawing direction of the second lead-out wiring 4A or the core 5 from the mounting surface 100a of the circuit board 100. (Arranged next to each other). Therefore, the transformer 1 and the secondary electrical component 104 can be mounted on the mounting surface 100a of the circuit board 100 with high density, and the product including the structure in which the transformer 1 is mounted on the circuit board 100 can be reduced in size. be able to.

さらに、本実施形態のトランス１によれば、カバー壁部１０がボビン２に一体に形成されているため、従来のようにトランスを収納ケースに収納する構造と比較して、構成部品点数が少なくなり、製造コストの削減及び製造効率の向上を図ることができる。
また、カバー壁部１０をボビン２に一体に形成することで、従来のようにトランスを収納ケースに収納する構造と比較して、回路基板１００におけるトランス１の実装領域や実装高さを小さく設定できるため、回路基板１００にトランス１を実装した構造を含む製品の小型化を特に図ることができる。 Furthermore, according to the transformer 1 of the present embodiment, the cover wall portion 10 is formed integrally with the bobbin 2, so the number of components is small compared to the conventional structure in which the transformer is housed in the housing case. Thus, the manufacturing cost can be reduced and the manufacturing efficiency can be improved.
Further, by forming the cover wall portion 10 integrally with the bobbin 2, the mounting area and mounting height of the transformer 1 on the circuit board 100 are set smaller than the conventional structure in which the transformer is stored in the storage case. Therefore, the product including the structure in which the transformer 1 is mounted on the circuit board 100 can be particularly downsized.

さらに、本実施形態のトランス１では、カバー壁部１０がコア５の底面及び側面のうち第二引出配線４Ａ側の領域にのみ形成されている、すなわち、カバー壁部１０がコア５の底面及び側面のうち必要最低限の領域を覆うため、トランス１の小型化を図ることができる。したがって、回路基板１００にトランス１を実装した構造を含む製品の小型化をさらに図ることができる。
また、本実施形態のトランス１によれば、カバー壁部１０が筒状部１１の外周面に対向する位置に配されないため、カバー壁部１０をボビン２に一体に形成しても、容易に一次巻線３及び二次巻線４を筒状部１１に巻きつけることができる。すなわち、トランス１の製造効率向上をさらに図ることもできる。 Furthermore, in the transformer 1 of the present embodiment, the cover wall portion 10 is formed only in the region on the second lead-out wiring 4A side of the bottom surface and side surface of the core 5, that is, the cover wall portion 10 is formed on the bottom surface of the core 5 and Since the minimum necessary area of the side surface is covered, the transformer 1 can be reduced in size. Therefore, the product including the structure in which the transformer 1 is mounted on the circuit board 100 can be further reduced in size.
Further, according to the transformer 1 of the present embodiment, the cover wall portion 10 is not disposed at a position facing the outer peripheral surface of the cylindrical portion 11, so that even if the cover wall portion 10 is formed integrally with the bobbin 2, it is easy. The primary winding 3 and the secondary winding 4 can be wound around the cylindrical portion 11. That is, the manufacturing efficiency of the transformer 1 can be further improved.

なお、上記第一実施形態のコア５は、二つのＥ型コアを組み合わせて構成されているが、これに限ることはなく、例えばＥ型コアとＩ型コアとを組み合わせて構成されてもよいし、例えばＵ型コアを用いて構成されてもよい。   In addition, although the core 5 of said 1st embodiment is comprised combining two E type | mold cores, it is not restricted to this, For example, you may be comprised combining an E type | mold core and an I type core. For example, it may be configured using a U-shaped core.

〔第二実施形態〕
次に、図７，８を参照して本発明の第二実施形態について説明する。
この実施形態では、第一実施形態のトランス１及びその実装構造と比較して、ボビン２及びコア５の一部構成のみが異なっており、その他の構成については、第一実施形態と同様である。本実施形態では、第一実施形態と同様の構成については同一符号を付す等して、その説明を省略する。 [Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In this embodiment, compared with the transformer 1 of the first embodiment and its mounting structure, only the partial configurations of the bobbin 2 and the core 5 are different, and the other configurations are the same as those of the first embodiment. . In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

図７，８に示すように、本実施形態のトランス５０を構成するボビン２には、第一実施形態と同様の第二底部カバー部１４Ｂ及び一対の側部カバー部１６，１６が一体に形成されている。ただし、本実施形態の各側部カバー部１６，１６は、第二引出配線４Ａの引出方向側に位置するコア５の端部からＸ軸方向に延出していない。
さらに、本実施形態のボビン２には、第二引出配線４Ａの引出方向（Ｙ軸方向）に直交するコア５の側面５ｂを覆う端部カバー部１７が一体に形成されている。本実施形態では、端部カバー部１７が、ボビン２のフランジ部１２からＸ軸方向に間隔をあけた位置において、第二底部カバー部１４Ｂに一体に形成されている。
また、本実施形態では、端部カバー部１７が第二引出配線４Ａの引出方向側に位置するコア５の側面５ｂを覆っている。なお、図示例では、第二底部カバー部１４ＢからＺ軸方向に突出する端部カバー部１７の突出高さが、コア５の高さよりも低く設定されているが、例えばコア５の高さ以上に設定されてもよい。 As shown in FIGS. 7 and 8, the bobbin 2 constituting the transformer 50 of the present embodiment is integrally formed with a second bottom cover portion 14B and a pair of side cover portions 16, 16 similar to those of the first embodiment. Has been. However, each side cover part 16 and 16 of this embodiment is not extended in the X-axis direction from the edge part of the core 5 located in the extraction direction side of 4 A of 2nd extraction wiring.
Furthermore, the end cover part 17 which covers the side surface 5b of the core 5 orthogonal to the extraction direction (Y-axis direction) of the second extraction wiring 4A is integrally formed on the bobbin 2 of the present embodiment. In the present embodiment, the end cover portion 17 is integrally formed with the second bottom cover portion 14B at a position spaced from the flange portion 12 of the bobbin 2 in the X-axis direction.
Moreover, in this embodiment, the edge part cover part 17 has covered the side surface 5b of the core 5 located in the extraction direction side of 4 A of 2nd extraction wiring. In the illustrated example, the protruding height of the end cover portion 17 protruding in the Z-axis direction from the second bottom cover portion 14B is set to be lower than the height of the core 5; May be set.

さらに、本実施形態では、コア５の幅方向（Ｙ軸方向）に延びる端部カバー部１７の両端に、一対の側部カバー部１６，１６が一体に連結され、一対の側部カバー部１６，１６及び端部カバー部１７を合わせた平面視形状がＣ字状となっている。これにより、本実施形態では、第二引出配線４Ａの引出方向側に位置するコア５の側面５ｃ，５ｃ，５ｂが、一対の側部カバー部１６，１６及び端部カバー部１７によって三方向から覆われている。
以上のように構成される本実施形態のボビン２では、第二底部カバー部１４Ｂ、一対の側部カバー部１６，１６及び端部カバー部１７によって、回路基板１００の実装面１００ａ（図４〜６参照）に対向するコア５の底面の一部、及び、コア５の底面に隣り合うコア５の側面の一部を覆うカバー壁部６０が構成されている。また、本実施形態のカバー壁部６０は、第一実施形態と同様に、コア５の底面及び側面のうち二次巻線４の引出配線４Ａ側（一方の引出配線側）の領域を覆っている。 Furthermore, in this embodiment, a pair of side cover parts 16 and 16 are integrally connected to both ends of the end cover part 17 extending in the width direction (Y-axis direction) of the core 5, and the pair of side cover parts 16. , 16 and the end cover portion 17 are in a C-shaped plan view. Thereby, in this embodiment, side surface 5c, 5c, 5b of the core 5 located in the extraction | drawer direction side of 4 A of 2nd extraction wirings from three directions by a pair of side part cover parts 16 and 16 and the edge part cover part 17. Covered.
In the bobbin 2 of the present embodiment configured as described above, the mounting surface 100a (FIG. 4 to FIG. 4) of the circuit board 100 is formed by the second bottom cover portion 14B, the pair of side cover portions 16 and 16, and the end cover portion 17. 6), a cover wall portion 60 is configured to cover a part of the bottom surface of the core 5 facing the surface of the core 5 and a part of the side surface of the core 5 adjacent to the bottom surface of the core 5. Moreover, the cover wall part 60 of this embodiment covers the area | region of the extraction | drawer wiring 4A side (one extraction wiring side) of the secondary winding 4 among the bottom face and side surface of the core 5 similarly to 1st embodiment. Yes.

さらに、本実施形態のトランス５０では、上記構成のボビン２に対してコア５を取り付けることができるように、コア５がＥ型コアとＩ型コアとを組み合わせて構成されている。そして、コア５のＩ型コアは、互いにＸ軸方向に対向するフランジ部１２と端部カバー部１７との間に挿入されている。
また、本実施形態においては、コア５のＩ型コアを容易にフランジ部１２と端部カバー部１７との間に挿入できるように、当該フランジ部１２に他方の鍔部１５が形成されていない。 Furthermore, in the transformer 50 of the present embodiment, the core 5 is configured by combining an E-type core and an I-type core so that the core 5 can be attached to the bobbin 2 having the above configuration. The I-type core of the core 5 is inserted between the flange portion 12 and the end cover portion 17 that face each other in the X-axis direction.
In the present embodiment, the flange portion 12 is not formed with the other flange 15 so that the I-shaped core of the core 5 can be easily inserted between the flange portion 12 and the end cover portion 17. .

以上のように構成される本実施形態のトランス５０、及び、トランス５０を回路基板１００（図４〜６参照）に実装した構造によれば、第一実施形態と同様の効果を奏する。
特に、本実施形態のトランス５０では、第二引出配線４Ａの引出方向側に位置して筒状部１１の軸線Ｌ１方向（Ｙ軸方向）に直交するコア５の側面５ｂが端部カバー部１７によって覆われているため、第一実施形態のように一対の側部カバー部１６，１６をＸ軸方向に延出させる場合と比較して、コア５と二次側回路との絶縁距離をさらに延長することができる。したがって、トランス１や二次側電気部品１０４をさらに高密度に実装することが可能となる。 According to the transformer 50 of the present embodiment configured as described above and the structure in which the transformer 50 is mounted on the circuit board 100 (see FIGS. 4 to 6), the same effects as those of the first embodiment can be obtained.
In particular, in the transformer 50 of the present embodiment, the side surface 5b of the core 5 that is located on the side of the second lead-out wiring 4A and is orthogonal to the axis L1 direction (Y-axis direction) of the cylindrical portion 11 is the end cover portion 17. Therefore, the insulation distance between the core 5 and the secondary circuit is further increased as compared with the case where the pair of side cover portions 16 and 16 are extended in the X-axis direction as in the first embodiment. Can be extended. Therefore, the transformer 1 and the secondary-side electrical component 104 can be mounted with higher density.

なお、上記第二実施形態では、各側部カバー部１６，１６が、第二引出配線４Ａの引出方向側に位置するコア５の端部から延出していないが、例えば図９に示すように、第一実施形態の場合と同様にＸ軸方向に延出していてもよい。この構成では、一対の側部カバー部１６，１６及び端部カバー部１７を合わせた平面視形状がＨ字状となる。この構成によれば、上記第一、第二実施形態の場合と比較して、コア５と二次側回路との絶縁距離をさらに延長することができる。したがって、トランスや二次側電気部品１０４をさらに高密度に実装することが可能となる。
また、上記第二実施形態では、カバー壁部６０が一対の側部カバー部１６，１６を備えて構成されるとしたが、例えば第二底部カバー部１４Ｂ及び端部カバー部１７のみによって構成されてもよい。 In the second embodiment, the side cover portions 16 and 16 do not extend from the end portion of the core 5 located on the side of the second lead-out wiring 4A in the lead-out direction. For example, as shown in FIG. As in the case of the first embodiment, it may extend in the X-axis direction. In this configuration, the planar view shape of the pair of side cover portions 16 and 16 and the end cover portion 17 is an H shape. According to this configuration, the insulation distance between the core 5 and the secondary circuit can be further extended as compared with the first and second embodiments. Therefore, it becomes possible to mount the transformer and the secondary-side electric component 104 with higher density.
In the second embodiment, the cover wall portion 60 is configured to include the pair of side cover portions 16, 16. However, for example, the cover wall portion 60 includes only the second bottom cover portion 14 </ b> B and the end cover portion 17. May be.

以上、実施形態により本発明の詳細を説明したが、本発明は上述した実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。
例えば、一次巻線３及び二次巻線４の引出配線３Ａ，４Ａの引出方向は、筒状部１１の軸線Ｌ１方向に平行することに限らず、少なくとも回路基板１００の実装面１００ａに平行するようにコア５から互いに離間する方向に設定されていればよい。したがって、一次巻線３及び二次巻線４の引出配線３Ａ，４Ａの引出方向は、例えば筒状部１１の軸線Ｌ１方向に直交する方向（例えばＹ軸方向）であってもよい。 Although the details of the present invention have been described above by the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, the lead-out directions of the lead wires 3A and 4A of the primary winding 3 and the secondary winding 4 are not limited to being parallel to the axis L1 direction of the cylindrical portion 11, but are at least parallel to the mounting surface 100a of the circuit board 100. As long as it is set in a direction away from the core 5 as described above. Therefore, the lead-out directions of the lead wires 3A and 4A of the primary winding 3 and the secondary winding 4 may be, for example, a direction (for example, the Y-axis direction) orthogonal to the axis L1 direction of the cylindrical portion 11.

また、カバー壁部１０，６０は、上記実施形態のようにボビン２の軸線Ｌ１方向の端部に位置するコア５の底面や側面を覆うことに限らず、コア５の底面や側面のうち少なくとも二次巻線４の引出配線４Ａの引出方向側の領域を覆えばよい。したがって、例えば前述したように引出配線３Ａ，４Ａの引出方向がＹ軸方向に設定されている場合、カバー壁部１０，６０は筒状部１１の外周面の径方向外側（例えば筒状部１１の外周面からＹ軸正方向側あるいは負方向側に離間した領域）に配されればよい。   Further, the cover wall portions 10 and 60 are not limited to covering the bottom surface and the side surface of the core 5 located at the end of the bobbin 2 in the direction of the axis L1 as in the above-described embodiment. What is necessary is just to cover the area | region of the extraction direction side of 4 A of extraction wirings of the secondary winding 4. FIG. Therefore, for example, as described above, when the lead-out direction of the lead wires 3A and 4A is set in the Y-axis direction, the cover wall portions 10 and 60 are radially outward of the outer peripheral surface of the tubular portion 11 (for example, the tubular portion 11). In the Y-axis positive direction side or the negative direction side).

また、ボビン２に備えるカバー壁部１０，６０は、筒状部１１の外側に位置するコア５の底面及び側面のうち二次巻線４の引出配線４Ａ側の領域を覆うことに限らず、例えば一次巻線３の引出配線３Ａ側の領域を覆ってもよい。すなわち、例えば第一底部カバー部１４Ａに、上記実施形態と同様の一対の側部カバー部１６，１６や端部カバー部１７が一体に形成されてもよい。
さらに、上記実施形態のトランス１，５０は、回路基板１００に実装された状態で筒状部１１の軸線Ｌ１方向が実装面１００ａに平行するが、例えば実装面１００ａに直交してもよい。 Moreover, the cover wall parts 10 and 60 with which the bobbin 2 is provided are not limited to covering the region on the lead wiring 4A side of the secondary winding 4 among the bottom surface and the side surface of the core 5 located outside the cylindrical part 11, For example, the region on the lead wiring 3A side of the primary winding 3 may be covered. That is, for example, a pair of side cover portions 16 and 16 and an end cover portion 17 similar to those in the above embodiment may be integrally formed on the first bottom cover portion 14A.
Furthermore, the transformers 1 and 50 of the above-described embodiment are mounted on the circuit board 100, and the direction of the axis L1 of the cylindrical portion 11 is parallel to the mounting surface 100a, but may be orthogonal to the mounting surface 100a, for example.

１，５０ トランス
２ ボビン
３ 一次巻線
３Ａ 引出配線
４ 二次巻線
４Ａ 引出配線
５ コア
５ｂ，５ｃ 側面
１０，６０ カバー壁部
１１ 筒状部
１２ フランジ部
１４Ｂ 第二底部カバー部
１６ 側部カバー部
１７ 端部カバー部
１００ 回路基板
１００ａ 実装面
１０２ 一次側回路の形成領域
１０３ 二次側回路の形成領域
Ｌ１ 軸線 1, 50 Transformer 2 Bobbin 3 Primary winding 3A Lead wire 4 Secondary winding 4A Lead wire 5 Cores 5b, 5c Side face 10, 60 Cover wall 11 Tubular part 12 Flange part 14B Second bottom cover part 16 Side cover Part 17 end cover part 100 circuit board 100a mounting surface 102 primary side circuit formation region 103 secondary side circuit formation region L1 axis

Claims (8)

コアと、一次巻線と、二次巻線と、前記コアを挿入して前記一次巻線及び前記二次巻線を巻きつける絶縁性のボビンとを備え、回路基板に実装されるトランスであって、
前記ボビンに、前記回路基板の実装面に対向する前記コアの底面の一部、及び、前記底面に隣り合う前記コアの側面の一部を覆うカバー壁部が一体に形成されていることを特徴とするトランス。 A transformer comprising a core, a primary winding, a secondary winding, and an insulating bobbin that inserts the core and winds the primary winding and the secondary winding, and is mounted on a circuit board. And
A cover wall portion is integrally formed on the bobbin so as to cover a part of the bottom surface of the core facing the mounting surface of the circuit board and a part of the side surface of the core adjacent to the bottom surface. Transformer. 前記一次巻線及び前記二次巻線の引出配線が、前記実装面に沿って前記コアから互いに離間する方向に引き出され、
前記カバー壁部が、少なくとも前記コアの底面及び側面のうち前記一次巻線及び前記二次巻線のいずれか一方の引出配線側の領域を覆うことを特徴とする請求項１に記載のトランス。 The lead wires of the primary winding and the secondary winding are drawn in a direction away from the core along the mounting surface,
2. The transformer according to claim 1, wherein the cover wall portion covers at least a region on the lead wiring side of either the primary winding or the secondary winding among the bottom surface and the side surface of the core. 前記カバー壁部が、前記一方の引出配線側の領域のうち、前記実装面に沿って前記引出配線の引出方向に直交する前記コアの幅方向の両端部をなす一対の側面の一部を覆う一対の側部カバー部を備えることを特徴とする請求項２に記載のトランス。   The cover wall portion covers a part of a pair of side surfaces forming both ends in the width direction of the core perpendicular to the lead-out direction of the lead-out line along the mounting surface in the region on the one lead-out wiring side. The transformer according to claim 2, further comprising a pair of side cover portions. 前記側部カバー部が、前記一方の引出配線の引出方向側に位置する前記コアの端部よりも、前記一方の引出配線の引出方向に延出していることを特徴とする請求項３に記載のトランス。   The said side part cover part is extended in the drawing-out direction of said one lead-out wiring rather than the edge part of the said core located in the drawing-out direction side of said one lead-out wiring. Transformer. 前記カバー壁部が、前記一方の引出配線側の領域のうち、前記引出配線の引出方向に直交する前記コアの側面を覆う端部カバー部を備えることを特徴とする請求項２から請求項４のいずれか一項に記載のトランス。   The said cover wall part is provided with the edge part cover part which covers the side surface of the said core orthogonal to the extraction direction of the said extraction wiring among the area | regions on the said one extraction wiring side. Transformer as described in any one of. 前記ボビンの軸線方向が前記実装面に平行するように構成され、
前記カバー壁部が、前記ボビンの軸線方向に直交する前記コアの側面を覆うように形成されていることを特徴とする請求項１から請求項５のいずれか一項に記載のトランス。 The bobbin is configured such that the axial direction of the bobbin is parallel to the mounting surface,
The transformer according to any one of claims 1 to 5, wherein the cover wall portion is formed so as to cover a side surface of the core perpendicular to the axial direction of the bobbin. 前記カバー壁部が、前記ボビンのうち前記一次巻線及び前記二次巻線を巻き付ける筒状部の軸線方向の端部に対し、前記ボビンの軸線方向に隣り合わせて配されていることを特徴とする請求項１から請求項６のいずれか一項に記載のトランス。   The cover wall portion is disposed adjacent to the axial end of the tubular portion around which the primary winding and the secondary winding of the bobbin are wound in the axial direction of the bobbin. The transformer according to any one of claims 1 to 6. 請求項１から請求項７のいずれか一項に記載のトランスを前記回路基板の実装面に実装したトランスの実装構造。   A transformer mounting structure in which the transformer according to claim 1 is mounted on a mounting surface of the circuit board.
JP2012278526A 2012-12-20 2012-12-20 Transformer and mounting structure of the same Pending JP2014123627A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009206111A (en) * 2008-02-26 2009-09-10 Fdk Corp Transformer
JP4831775B2 (en) * 2007-11-20 2011-12-07 Ｎｅｃトーキン株式会社 Winding parts

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4831775B2 (en) * 2007-11-20 2011-12-07 Ｎｅｃトーキン株式会社 Winding parts
JP2009206111A (en) * 2008-02-26 2009-09-10 Fdk Corp Transformer

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