JP3619812B2 - Low profile transformer - Google Patents

Low profile transformer Download PDF

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Publication number
JP3619812B2
JP3619812B2 JP2002135314A JP2002135314A JP3619812B2 JP 3619812 B2 JP3619812 B2 JP 3619812B2 JP 2002135314 A JP2002135314 A JP 2002135314A JP 2002135314 A JP2002135314 A JP 2002135314A JP 3619812 B2 JP3619812 B2 JP 3619812B2
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Prior art keywords
core
portions
thin
pair
main body
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JP2003332137A (en
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勝美 荻迫
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東京コイルエンジニアリング株式会社
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Description

【０００１】
【発明の属する技術分野】
この発明は、例えば、カメラ等の光学機器や小型電子機器等に使用される低背型トランスに関する。
【０００２】
【従来の技術】
カメラ等の光学機器や小型電子機器等に使用される小型トランスは、光学機器、小型電子機器の限られた狭いスペースに格納されるために、小型化、薄型化が要求されている。
【０００３】
例えば、特公平６−４８６５１号公報は、前述のような要求を満足するために提案されたもので、ボビンの上部にコアを搭載した構造のトランスである。そして、コアは、コイルを巻回する中央コア部の両端部に分路コア部を有する主体コアと、この主体コアの両側で各々の分路コア部間を連結させる外コアと、主体コアの分路コア部に嵌合させる嵌合部と中央コア部を略中央に案内させる切欠部とを形成した複数の端子ピン固定板とから構成されている。
【０００４】
そして、端子ピン固定板を主体コアの分路コア部に嵌合固着した後、中央コア部にコイルを巻装し、その後に外コアを分路コア部に固着した構造である。
【０００５】
【発明が解決しようとする課題】
しかしながら、前述のように構成された小型トランスは、ボビンにコアを搭載した構造であり、ボビンの高さ寸法とコアの高さ寸法をプラスした寸法がトランスの高さとなっている。従って、ボビン及びコアの高さ寸法を極力小さくしても、上下方向の重ね構造であるため薄型化に限度がある。
【０００６】
この発明は、前記事情に着目してなされたもので、その目的とするところは、ボビンとコアとの重ね部分を薄肉構造とし、薄型化を図ることができる低背型トランスを提供することにある。
【０００７】
【課題を解決するための手段】
この発明は、前記目的を解決するために、請求項１は、コイルが巻装される扁平矩形状の中央コア部及びこの中央コア部の両端部に一体に設けられた両端コア部を有するコア主体と、内側に薄肉部、外側に厚肉部を有し、前記薄肉部には上方に突出する一対の突出片を設けて、これら突出片と前記厚肉部の側面との間に上向きに開口する嵌合部を形成し、前記コア主体の両端コア部が前記嵌合部に嵌合されて前記薄肉部に載置されるとともに、前記一対の突出片で前記中央コア部の両端部を挟持することにより、前記コア主体と一体的に結合される一対の合成樹脂製のボビンと、両端部が前記薄肉部の長手方向の端部に支持されて前記中央コア部を挟んで前記コア主体の両側部に設けられ、前記両端部が前記一対のボビンに接着固定される外側コア部と、前記一対のボビンにインサートされ、前記コイルの端末が接続される端子と、を具備したことを特徴としている。
【０００８】
請求項２は、請求項１の前記両端コア部はその長手方向両端部が前記一対の突出片から前記薄肉部の長手方向両端に向けて食み出す長さを有しており、前記両端コア部の長手方向両端部に前記外側コア部の長手方向の端部が当たっていることを特徴としている。
【０００９】
請求項３は、請求項１又は２の前記薄肉部が一対の段差を有しているとともに、これら段差間の載置部がその両側に位置する前記薄肉部の両端部より厚く形成されていて、前記端子に接続される前記コイルの端末が挿通されるコイル挿通溝を、前記載置部の下面を通って前記ボビンの底面に設けたことを特徴としている。
【００１０】
前記構成によれば、一対のボビンの嵌合部に対してその上方からコア主体の両端コア部を位置決めし、両端コア部を嵌合部に押し込むと、両端コア部が嵌合部に嵌合される。そして、中央コア部の両端部は一対の突出片間に挟持され、両端コア部はボビン本体の薄肉部に載置された状態となり、コア主体に対して一対のボビンが一体的に結合される。従って、コア主体とボビンの高さが略同一となり、組立て状態における高さ寸法が小さく、薄型化が図れる。
【００１１】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。
【００１２】
図１〜図３は第１の実施形態を示し、図１は低背型トランスの斜視図、図２は低背型トランスの分解斜視図、図３（ａ）はコア主体の平面図、（ｂ）はボビンの底面図、（ｃ）は側面図、（ｄ）は組立て状態の一部を示す平面図である。
【００１３】
図１〜図３に示すように、コア主体１は、例えばマンガン系のフエライト材のように電気絶縁性の低い材料で形成され、コイルが巻装される扁平矩形状の中央コア部２と、この中央コア部２の両端部に直角方向に一体に設けられた角柱状の両端コア部３とから構成されている。
【００１４】
コア主体１の両端部に設けられる一対のボビン４は、電気絶縁性の高い合成樹脂材料によって形成され、ボビン本体５は両端コア部３より長い角柱状に形成されている。ボビン本体５の長手方向に沿う一側部である内側には高さ方向が低い薄肉部６が設けられ、他側部である外側には高さ方向が高い厚肉部７が設けられている。
【００１５】
薄肉部６の長手方向の中央部には前記両端コア部３の長さに略等しい幅で数ｍｍ突出した載置部８が形成されている。それによって、図１に示すように載置部８は、その両側に位置する薄肉部６の長手方向両端部６ａより厚くなっているとともに、これら載置部８と両端部６ａとの間には段差８ａが夫々形成されている。載置部８の両端部には上方に突出する一対の突出片９，９が設けられている。そして、厚肉部７の側面と突出片９，９との間に上向きに開口する略コ字状の嵌合部１０が形成されている。一対の突出片９と９との間隔Ｌは、前記中央コア部２の幅Ｗと略等しく突出片９と９との間に中央コイル部２が嵌合できるようになっている。
【００１６】
さらに、ボビン本体５の厚肉部７の外側面には複数個、本実施形態ではボビン本体５の片側に３個、合計６個の端子１１…がインサートした状態で設けられている。端子１１…は同一形状であり、例えば、銅板、燐青銅等を略コ字状に打ち抜き加工したものである。
【００１７】
端子１１は、端子本体部１２と、この端子本体部１２から側方へ突出する突出量が小さい巻線処理端子部１３と、巻線処理端子部１３と平行に側方へ突出する突出量が大きい基板実装端子部１４とから構成されている。
【００１８】
前記端子１１の端子本体部１２がボビン本体５にインサートされ、巻線処理端子部１３はボビン本体５の外側面に位置し、基板実装端子部１４は外側面から底面に沿って折曲している。更に、図２及び図３（ｃ）（ｄ）に示すようにボビン本体５の底面には、各巻線処理端末部１３の個数に対応してコイル挿通溝１５が、載置部８の下面を通ってボビン本体５を横断するように設けられている。
【００１９】
また、前記コア主体１の中央コア部２を挟んで両側部には両端面が前記一対のボビン４に固定される外側コア部１６が設けられている。この外側コア部１６はコア主体１と同一材料で角柱状に形成されている。
【００２０】
次に、前述のように構成された低背型トランスの組立て順序の一例について説明する。一対のボビン４の嵌合部１０に対してその上方からコア主体１の両端コア部３を位置決めし、両端コア部３を嵌合部１０に押し込むと、両端コア部３が嵌合部１０に嵌合される。
【００２１】
このとき、中央コア部２の両端部は一対の突出片９と９との間に挟持され、両端コア部３はボビン本体５の薄肉部６に設けられた載置部８に載置された状態となり、コア主体１に対して一対のボビン４が一体的に結合される。又、この結合状態では図１及び図３（ａ）（ｃ）に示すように両端コア部３の長手方向両端部が、一対の突出片９から薄肉部６の長手方向の端に向けて食み出す。
【００２２】
この状態で、ボビン４をチャッキングし、中央コア部２に各コイル１７を巻装するが、コア主体１は、例えばマンガン系のフエライト材のように電気絶縁性の低い材料で形成されているため、絶縁紙、絶縁テープ１８を中央コア部２に巻き付けた後に各コイル１７を巻線機または手作業によって巻装する。
【００２３】
コイル１７を巻装後、そのコイル１７の外側に絶縁紙、絶縁テープ１８を巻き付ける。次に、コイル１７を挟むように外側コア部１６をボビン４，４間に位置決めし、外側コア部１６の両端部をボビン本体５に接着固定する。
【００２４】
最後に、各コイル１７の巻き始め端末１７ａ及び巻き終り端末１７ａをボビン本体５の底面に設けたコイル挿通溝１５に挿通し、ボビン本体５の外側で巻線処理端子部１３にからげて、半田付けまたはアーク溶接することにより、完成する。
【００２５】
また、巻線処理端子部１３にコイル１７の端末１７ａをからげて半田付けされ、基板実装端子部１４は基板に対してリフロー半田付けされるが、基板実装端子部１４はボビン本体５の外側面から底面に沿って折曲されている。従って、基板実装端子部１４は巻線処理端子部１３と離間した位置関係にあり、リフロー半田付け時に巻線処理端子部１３に熱影響を与えることがない。さらに巻線処理端子部１３に対してコイル１７の端末１７ａを自動巻線機によってからげる際に基板実装端子部１４が邪魔にならず、からげ作業の作業性を向上できる。
【００２６】
前記実施形態においては、コア主体をマンガン系のフエライト材のように電気絶縁性の低い材料で形成したが、コア主体の材料は限定されるものではない。
【００２７】
【発明の効果】
以上説明したように、この発明によれば、一対のボビンの嵌合部に対してコア主体の両端コア部を嵌合部に押し込むと、両端コア部が嵌合部に嵌合され、中央コア部の両端部は一対の突出片間に挟持され、両端コア部はボビン本体の薄肉部に載置された状態となり、コア主体に対して一対のボビンが一体的に結合される。従って、コア主体とボビンの高さが略同一となり、組立て状態における高さ寸法が小さく、薄型化が図れる。
【図面の簡単な説明】
【図１】この発明の第１の実施形態を示す低背型トランスの斜視図。
【図２】同実施形態の低背型トランスの分解斜視図。
【図３】同実施形態を示し、（ａ）はコア主体の平面図、（ｂ）はボビンの底面図、（ｃ）は側面図、（ｄ）は組立て状態の一部を示す平面図。
【符号の説明】
１…コア主体
２…中央コア部
３…両端コア部
４…ボビン
６…薄肉部
６ａ…薄肉部の長手方向の端部
７…厚肉部
８…載置部
８ａ…段部
９…突出片
１０…嵌合部
１１…端子
１５…コイル挿通溝
１６…外側コア部
１７…コイル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low profile transformer used in, for example, an optical device such as a camera, a small electronic device, and the like.
[0002]
[Prior art]
A small transformer used for an optical device such as a camera or a small electronic device is stored in a limited narrow space of the optical device or the small electronic device, so that it is required to be small and thin.
[0003]
For example, Japanese Patent Publication No. 6-48651 is proposed in order to satisfy the above-described requirements, and is a transformer having a structure in which a core is mounted on an upper portion of a bobbin. The core includes a main core having shunt core portions at both ends of the central core portion around which the coil is wound, an outer core that connects between the shunt core portions on both sides of the main core, It is comprised from the some terminal pin fixing plate which formed the fitting part fitted to a shunt core part, and the notch part which guides a center core part to a substantially center.
[0004]
Then, after the terminal pin fixing plate is fitted and fixed to the shunt core portion of the main core, a coil is wound around the central core portion, and then the outer core is fixed to the shunt core portion.
[0005]
[Problems to be solved by the invention]
However, the small transformer configured as described above has a structure in which a core is mounted on a bobbin, and the height obtained by adding the height dimension of the bobbin and the height dimension of the core is the height of the transformer. Therefore, even if the height dimensions of the bobbin and the core are made as small as possible, there is a limit to reducing the thickness because of the overlapping structure in the vertical direction.
[0006]
The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a low-profile transformer capable of reducing the thickness by making the overlapping portion of the bobbin and the core a thin structure. is there.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned object, the present invention provides a core having a flat rectangular central core portion around which a coil is wound, and both end core portions integrally provided at both end portions of the central core portion. The main body has a thin part on the inside and a thick part on the outside, and the thin part is provided with a pair of projecting pieces projecting upward, and upward between the projecting pieces and the side surface of the thick part. An opening fitting portion is formed, and both end core portions of the core main body are fitted into the fitting portion and placed on the thin wall portion, and both ends of the central core portion are formed by the pair of projecting pieces. A pair of synthetic resin bobbins that are integrally coupled to the core main body by sandwiching the core main body, and the core main body sandwiching the central core portion with both ends supported by the longitudinal ends of the thin-walled portion outside that provided on both sides, said end portion is adhered and fixed to said pair of bobbin And the core portion is inserted into the pair of bobbins, it is characterized in that the terminal of the coil is provided with a terminal to be connected.
[0008]
According to a second aspect of the present invention, the both end core portions of the first aspect have a length in which both end portions in the longitudinal direction protrude from the pair of projecting pieces toward both ends in the longitudinal direction of the thin wall portion. The longitudinal end portions of the outer core portion are in contact with both longitudinal end portions of the portion.
[0009]
In claim 3, the thin portion of claim 1 or 2 has a pair of steps, and the placement portions between these steps are formed thicker than both ends of the thin portion located on both sides thereof. The coil insertion groove into which the terminal of the coil connected to the terminal is inserted is provided on the bottom surface of the bobbin through the lower surface of the mounting portion .
[0010]
According to the above configuration, when both end core portions of the core main body are positioned from above the fitting portion of the pair of bobbins and the both end core portions are pushed into the fitting portion, the both end core portions are fitted into the fitting portions. Is done. Then, both ends of the central core portion are sandwiched between a pair of projecting pieces, and both end core portions are placed on the thin portion of the bobbin main body, and the pair of bobbins are integrally coupled to the core main body. . Accordingly, the height of the core main body and the bobbin are substantially the same, the height dimension in the assembled state is small, and the thickness can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 to 3 show a first embodiment, FIG. 1 is a perspective view of a low profile transformer, FIG. 2 is an exploded perspective view of a low profile transformer, FIG. b) is a bottom view of the bobbin, (c) is a side view, and (d) is a plan view showing a part of the assembled state.
[0013]
As shown in FIGS. 1 to 3, the core main body 1 is formed of a material having low electrical insulation, such as a manganese-based ferrite material, and has a flat rectangular central core portion 2 around which a coil is wound, The central core portion 2 is composed of a prismatic both-end core portion 3 that is integrally provided at both end portions in a perpendicular direction.
[0014]
The pair of bobbins 4 provided at both ends of the core main body 1 are formed of a synthetic resin material having high electrical insulation, and the bobbin main body 5 is formed in a rectangular column shape longer than the core portions 3 at both ends. A thin portion 6 having a low height direction is provided on the inner side which is one side portion along the longitudinal direction of the bobbin body 5, and a thick portion 7 having a high height direction is provided on the outer side which is the other side portion. .
[0015]
A mounting portion 8 is formed at the center in the longitudinal direction of the thin portion 6 and protrudes several mm with a width substantially equal to the length of the core portions 3 at both ends . Thereby, as shown in FIG. 1, the placing portion 8 is thicker than both longitudinal end portions 6a of the thin portion 6 located on both sides thereof, and between the placing portion 8 and both end portions 6a. Steps 8a are respectively formed. A pair of projecting pieces 9 and 9 projecting upward are provided at both ends of the mounting portion 8. A substantially U-shaped fitting portion 10 that opens upward is formed between the side surface of the thick portion 7 and the protruding pieces 9 and 9. The distance L between the pair of protruding pieces 9 and 9 is substantially equal to the width W of the central core portion 2 so that the central coil portion 2 can be fitted between the protruding pieces 9 and 9.
[0016]
Further, a plurality of terminals 11 are inserted on the outer surface of the thick portion 7 of the bobbin main body 5, in this embodiment, three on one side of the bobbin main body 5, for a total of six terminals 11. The terminals 11 have the same shape, and are obtained by punching a copper plate, phosphor bronze, or the like into a substantially U shape.
[0017]
The terminal 11 has a terminal main body 12, a winding processing terminal portion 13 with a small protruding amount protruding sideways from the terminal main body portion 12, and a protruding amount protruding sideways in parallel with the winding processing terminal portion 13. It is composed of a large board mounting terminal portion 14.
[0018]
The terminal main body portion 12 of the terminal 11 is inserted into the bobbin main body 5, the winding processing terminal portion 13 is located on the outer surface of the bobbin main body 5, and the board mounting terminal portion 14 is bent from the outer surface along the bottom surface. Yes. Further, on the bottom surface of the bobbin body 5 as shown in FIG. 2 and FIG. 3 (c) (d), the coil insertion groove 15 corresponding to the number of each winding processing terminal unit 13, the lower surface of the mounting part 8 It is provided so as to pass through the bobbin body 5.
[0019]
Further, outer core portions 16 whose both end surfaces are fixed to the pair of bobbins 4 are provided on both sides of the central core portion 2 of the core main body 1. The outer core portion 16 is formed in the shape of a prism with the same material as the core main body 1.
[0020]
Next, an example of the assembly order of the low-profile transformer configured as described above will be described. When both end core portions 3 of the core main body 1 are positioned from above with respect to the fitting portions 10 of the pair of bobbins 4 and the both end core portions 3 are pushed into the fitting portions 10, the both end core portions 3 become the fitting portions 10. Mated.
[0021]
At this time, both end portions of the central core portion 2 are sandwiched between the pair of projecting pieces 9 and 9, and both end core portions 3 are placed on the placement portion 8 provided in the thin portion 6 of the bobbin body 5. In this state, the pair of bobbins 4 are integrally coupled to the core main body 1. Further, in this coupled state, as shown in FIG. 1 and FIGS. 3A and 3C, both longitudinal end portions of the core portion 3 are eaten from the pair of protruding pieces 9 toward the longitudinal end of the thin portion 6. Stick out.
[0022]
In this state, the bobbin 4 is chucked and each coil 17 is wound around the central core portion 2. The core main body 1 is made of a material having low electrical insulation, such as a manganese-based ferrite material. Therefore, after winding the insulating paper and insulating tape 18 around the central core portion 2, each coil 17 is wound by a winding machine or by manual work.
[0023]
After winding the coil 17, the insulating paper and the insulating tape 18 are wound around the outside of the coil 17. Next, the outer core portion 16 is positioned between the bobbins 4 and 4 so as to sandwich the coil 17, and both end portions of the outer core portion 16 are bonded and fixed to the bobbin main body 5.
[0024]
Finally, the winding start terminal 17a and the winding end terminal 17a of each coil 17 are inserted into the coil insertion groove 15 provided on the bottom surface of the bobbin body 5, and are wound on the winding processing terminal portion 13 outside the bobbin body 5. Complete by soldering or arc welding.
[0025]
Further, the terminal 17a of the coil 17 is tangled and soldered to the winding processing terminal portion 13, and the board mounting terminal portion 14 is reflow soldered to the board, but the board mounting terminal portion 14 is outside the bobbin body 5. It is bent along the bottom from the side. Therefore, the board mounting terminal portion 14 is in a positional relationship separated from the winding processing terminal portion 13, and does not affect the winding processing terminal portion 13 during reflow soldering. Further, when the terminal 17a of the coil 17 is bent by the automatic winding machine with respect to the winding processing terminal portion 13, the board mounting terminal portion 14 does not get in the way, and the workability of the bending operation can be improved.
[0026]
In the above embodiment, the core main body is formed of a material having low electrical insulation, such as a manganese-based ferrite material, but the core main material is not limited.
[0027]
【The invention's effect】
As described above, according to the present invention, when both end core portions of the core main body are pushed into the fitting portion with respect to the fitting portions of the pair of bobbins, the both end core portions are fitted into the fitting portion, and the central core Both end portions of the portion are sandwiched between a pair of projecting pieces, and both end core portions are placed on the thin wall portion of the bobbin main body, and the pair of bobbins are integrally coupled to the core main body. Accordingly, the height of the core main body and the bobbin are substantially the same, the height dimension in the assembled state is small, and the thickness can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a low profile transformer showing a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the low profile transformer of the same embodiment.
3A is a plan view of the core main body, FIG. 3B is a bottom view of the bobbin, FIG. 3C is a side view, and FIG. 3D is a plan view showing a part of the assembled state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Core main body 2 ... Center core part 3 ... Both ends core part 4 ... Bobbin 6 ... Thin part
6a: End 7 in the longitudinal direction of the thin part 7 ... Thick part
8 ... Placement section
8a ... Step 9 ... Projecting piece 10 ... Fitting 11 ... Terminal
15 ... Coil insertion groove 16 ... Outer core part 17 ... Coil

Claims (3)

コイルが巻装される扁平矩形状の中央コア部及びこの中央コア部の両端部に一体に設けられた両端コア部を有するコア主体と、
内側に薄肉部、外側に厚肉部を有し、前記薄肉部には上方に突出する一対の突出片を設けて、これら突出片と前記厚肉部の側面との間に上向きに開口する嵌合部を形成し、前記コア主体の両端コア部が前記嵌合部に嵌合されて前記薄肉部に載置されるとともに、前記一対の突出片で前記中央コア部の両端部を挟持することにより、前記コア主体と一体的に結合される一対の合成樹脂製のボビンと、
両端部が前記薄肉部の長手方向の端部に支持されて前記中央コア部を挟んで前記コア主体の両側部に設けられ、前記両端部が前記一対のボビンに接着固定される外側コア部と、
前記一対のボビンにインサートされ、前記コイルの端末が接続される端子と、
を具備したことを特徴とする低背型トランス。A core main body having a flat rectangular central core portion around which a coil is wound and both end core portions integrally provided at both end portions of the central core portion;
A thin-walled portion on the inside and a thick-walled portion on the outside. The thin-walled portion is provided with a pair of projecting pieces projecting upward, and the fitting is opened upward between the projecting pieces and the side surface of the thick-walled portion. Forming a mating portion, wherein both end core portions of the core main body are fitted into the fitting portion and placed on the thin portion, and the both end portions of the central core portion are sandwiched between the pair of projecting pieces A pair of synthetic resin bobbins integrally coupled to the core main body,
Both end portions are supported by the longitudinal end portions of the thin-walled portion and are provided on both side portions of the core main body with the central core portion interposed therebetween, and the both end portions are bonded and fixed to the pair of bobbins; ,
A terminal inserted into the pair of bobbins and connected to a terminal of the coil;
A low-profile transformer characterized by comprising: 前記両端コア部はその長手方向両端部が前記一対の突出片から前記薄肉部の長手方向両端に向けて食み出す長さを有しており、前記両端コア部の長手方向両端部に前記外側コア部の長手方向の端部が当たっていることを特徴とする請求項１に記載の低背型トランス。 The both end core portions have a length in which both end portions in the longitudinal direction protrude from the pair of protruding pieces toward both ends in the longitudinal direction of the thin-walled portion, and the outer ends are disposed at both ends in the longitudinal direction of the both end core portions. 2. The low profile transformer according to claim 1, wherein an end of the core portion in the longitudinal direction is in contact . 前記薄肉部が一対の段差を有しているとともに、これら段差間の載置部がその両側に位置する前記薄肉部の両端部より厚く形成されていて、前記端子に接続される前記コイルの端末が挿通されるコイル挿通溝を、前記載置部の下面を通って前記ボビンの底面に設けたことを特徴とする請求項１又は２に記載の低背型トランス。 The thin-walled portion has a pair of steps, and the placement portions between the steps are formed thicker than both end portions of the thin-walled portion located on both sides of the thin-walled portion, and the terminal of the coil connected to the terminal The low profile transformer according to claim 1 or 2, wherein a coil insertion groove through which the coil is inserted is provided on the bottom surface of the bobbin through the lower surface of the mounting portion .
JP2002135314A 2002-05-10 2002-05-10 Low profile transformer Expired - Fee Related JP3619812B2 (en)

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