CN211670063U - Forming structure of surface-mounted inductor - Google Patents
Forming structure of surface-mounted inductor Download PDFInfo
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- CN211670063U CN211670063U CN201922163014.6U CN201922163014U CN211670063U CN 211670063 U CN211670063 U CN 211670063U CN 201922163014 U CN201922163014 U CN 201922163014U CN 211670063 U CN211670063 U CN 211670063U
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Abstract
The utility model relates to a shaping structure of surface mounting inductor has the winding and constitutes the electrode structure that the cross-section is "I shape" with the worker body, and the worker body is located both ends about the winding, winding surface winding has the coil, and worker body upper portion has first electric conductor, and the first electric conductor of the worker body of both ends about being connected to respectively as the terminal is drawn forth at the coil both ends, has the second electric conductor on the coil terminal and forms the electrode face, detaches the electrode face part, and the high pressure shaping material that the electrode structure of winding coil comprises magnetic powder and thermosetting resin accomplishes the parcel. The utility model discloses an inductor of making, the appearance volume that reduces the inductor that can furthest makes it little again thin, and the electrode tip need not the wiring and exposes when the shaping in addition, and its electrode contact jaw area is big, the good reliability.
Description
Technical Field
The utility model belongs to the technical field of at manufacturing surface mounting inductor, in particular to surface mounting inductor's shaping structure.
Background
At present, a sealing material made of magnetic powder and resin has been widely used in the industry to form a coil surface-mount inductor, and this field emphasizes the Isat value of direct current superimposed current and the Rdc value of DC resistance, and the higher the Isat value, the lower the Rdc value is required, and therefore, on the premise of a small size, it is required to increase the size of a built-in coil while reducing leakage flux.
In recent years, with the development of high-density packaging, it is required to reduce the size of the product profile and the bottom electrode, and as the product becomes smaller, the cross section of the coil used tends to become smaller, as shown in fig. 3, and in this case, in the conventional method of forming the electrode on the molded body having the exposed winding terminal, there are problems of small bonding area due to small terminal exposed area, low connection reliability, and the like.
Disclosure of Invention
An object of the utility model is to prior art current situation, provide a shaping structure of surface mounting inductor, have bottom electrode structure, its whole appearance is little again thin, and the magnetic leakage copper is also very little, and has reliable connectivity.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a forming structure of a surface-mounted inductor is provided with electrode structures, the cross section of each electrode structure is in an I shape, the work body is located at the left end and the right end of the winding portion, a coil is wound on the surface of the winding portion, a first conductor is arranged on the upper portion of the work body, the first conductor serving as a terminal and connected to the work body at the left end and the right end is led out from the two ends of the coil respectively, a second conductor is arranged on the coil terminal to form an electrode surface, the electrode surface is removed, and the electrode structures of the wound coil are wrapped by magnetic resin materials.
The utility model discloses a forming method of surface mounting inductor specifically includes following step:
(1) the electrode structure with the cross section of an I shape is formed by mixing magnetic powder with thermosetting resin, two ends of the electrode structure are provided with a tool body, the middle part is provided with a winding part, and a first conductor is attached to the upper end surface of the tool body or directly plated on the upper end surface of the tool body;
(2) using 3t/cm2The flat plate body is formed by high-pressure molding;
(3) winding the coil on the surface of the winding part in a horizontal winding mode, and leading out two ends of the coil to be used as terminals to be respectively connected to the upper parts of the first electric conductors of the left and right duplex bodies;
(4) in a forming die, wrapping a flat plate body from top to bottom by adopting a hot pressing mode to wrap an electrode structure wound with a coil to form a blank body, wherein the flat plate body is wrapped from an opposite surface of the electrode structure with a first conductor;
(5) and (3) aiming at the part of the coil terminal connected above the first conductor, laser peeling is adopted to expose at least the coil terminal on the blank, and plating or welding flux is added on the coil terminal to form a second conductor.
In the scheme, the electrode structure adopts 3t/cm2At a high pressure or by heating at a peak value of 230 deg.C or below and heating at a temperature of 3t/cm2The following pressure was integrally formed.
Furthermore, the coil terminal is connected on the first conductor by adopting a hot-press welding or reflow welding mode.
The utility model has the advantages that: the adoption contains the sealing material of magnetic material and resin and forms the I-shaped's that the level was placed electrode structure, makes the coil can carry out horizontal winding or alpha winding, and convenient and electrode structure's first conductor connection, after through hot pressing parcel shaping, can make electrode end stable in structure, and can adjust the area of electrode end as required, the inductor that this mode formed not only submits for a short time, and thickness is thin, and can effectively reduce the magnetic leakage flux, improves the quality and the uniformity of product.
Description of the drawings:
FIG. 1 is a flow chart of the molding process of the present invention;
FIG. 2 is a flow chart of the assembly of the first electric conductor and the winding coil in the electrode structure of the present invention;
FIG. 3 is a partial structural cross-sectional view of the finished product included in the present invention;
FIG. 4 is a flow chart of the hot press molding of the present invention.
The specific implementation mode is as follows:
please refer to fig. 1 to 3, which are schematic structural diagrams of a preferred embodiment of the present invention, the present invention relates to a forming structure of a surface mount inductor, which has an electrode structure 3 with an i-shaped cross section formed by a winding part 1 and a tool body 2, the tool body 2 is located at both ends of the winding part 1, a coil 4 is wound on the surface of the winding part 1, a first electric conductor 5 is arranged on the upper part of the tool body 2, both ends of the coil 4 are led out as terminals to be respectively connected to the first electric conductors 5 of the tool body 2 at both ends, a second electric conductor 6 is arranged on the coil terminal to form an electrode surface, the electrode surface is removed, the electrode structure 3 of the winding coil 4 is wrapped by a magnetic resin material, and the magnetic resin material is formed by mixing magnetic powder and thermosetting resin under high pressure.
The shape of the electrode structure 3 can enable the coil 4 to be horizontally wound, the thickness of a formed blank body is greatly reduced, two terminals of the coil 4 do not need wiring, a high-pressure forming material consisting of magnetic powder and thermosetting resin is a flat plate body 7, the flat plate body 7 is wrapped on the electrode structure 3 through hot pressing, laser peeling is adopted to expose the coil terminal, and the coil terminal is covered with the second electric conductor 6, so that a reliable and stable connecting electrode can be obtained.
The first conductor 5 on the tool body 2 can be formed by directly coating or printing silver paste (thermosetting resin containing silver) on the tool body 2 as a first layer, then forming a base electrode by thermosetting, plating nickel on the second layer on the basis of the first layer, and plating tin on the second layer to form the first conductor 5 with a three-layer structure; or the first conductor 5 can be a copper material plated in vacuum, and the plating layer can be a copper plating layer or the three-layer plating layer structure; or a metal electrode plate with a three-layer electroplating structure can be directly adopted as the first conductor 5 to be directly adhered to the workpiece 2.
The first conductor 5 preferably covers one end face of the body 2, so that the coil 4 terminal connection is more reliable and poor contact caused by dislocation in the molding process is avoided.
The second electrical conductor 6 is preferably a tin plating or solder.
The terminals of the coil 4 are connected to the first conductor 5 by thermocompression bonding or reflow soldering.
The thermosetting resin may be a hot air epoxy resin having a temperature resistance level of 220 c, and by molding with the resin, the protrusions corresponding to the press-fit surfaces on the side surfaces of the coil flow between the side surfaces of the coil and the inner wall of the mold, and even if the coil is enlarged, a molded body in which the entire coil is covered with the resin can be formed.
The utility model discloses a forming method of surface mounting inductor, as shown in FIG. 4, specifically include following step:
(1) mixing magnetic powder with thermosetting resin at 3t/cm2The section of the pressure preformed electrode structure 3 is I-shaped, two ends of the electrode structure 3 are respectively provided with a work body 2, the middle part is provided with a winding part 1, a first conductor 5 is attached to the upper end face of the work body 2, or the upper end face of the work body 2 is directly plated with the first conductor 5;
(2) mixing magnetic powder with thermosetting resin at 3t/cm2The flat preform 7 is pressed;
(3) winding a coil 4 on the surface of the winding part 1 in a horizontal winding mode, and leading out two ends of the coil 4 as terminals to be respectively connected to the upper parts of first electric conductors 5 of the left and right duplex bodies 2;
(4) in a forming die, applying heat and pressure in a hot pressing mode, enabling the flat plate body 7 to flow and cover the whole electrode structure 3 while destroying the flat plate body 7, enabling the flat plate body 7 to wrap the electrode structure 3 wound with the coil 4 from top to bottom to form a blank body, specifically enabling the flat plate body 7 to wrap from the opposite surface of the electrode structure 3 with the first conductor 5, enabling the distance between the first conductor 5 and the outer wall of the formed blank body to be shortest, and facilitating the subsequent breaking to expose the terminal of the coil 4;
(5) at least the coil terminal is exposed at the blank by laser peeling at the terminal portion of the coil 4 connected to the first conductor 5, and a second conductor 6 is formed by adding a plating or solder to the terminal portion of the coil 4.
The electrode structure adopts 3t/cm2At a high pressure or by heating at a peak value of 230 deg.C or below and heating at a temperature of 3t/cm2The following pressure was integrally formed.
Of course, the above illustration is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so all equivalent changes made in the principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A molding structure of a surface mount inductor is characterized in that: the electrode structure is provided with an electrode structure with an I-shaped section formed by a winding part and a tool body, wherein the tool body is positioned at the left end and the right end of the winding part, a coil is wound on the surface of the winding part, a first conductor is arranged at the upper part of the tool body, the first conductor which is used as a terminal and is respectively connected to the tool body at the left end and the right end is led out from the two ends of the coil, a second conductor is arranged on the terminal of the coil to form an electrode surface, the electrode surface part is removed, and the electrode structure of the wound coil is wrapped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922163014.6U CN211670063U (en) | 2019-12-06 | 2019-12-06 | Forming structure of surface-mounted inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922163014.6U CN211670063U (en) | 2019-12-06 | 2019-12-06 | Forming structure of surface-mounted inductor |
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| CN211670063U true CN211670063U (en) | 2020-10-13 |
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| CN201922163014.6U Active CN211670063U (en) | 2019-12-06 | 2019-12-06 | Forming structure of surface-mounted inductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797165A (en) * | 2019-12-06 | 2020-02-14 | 汕头市信技电子科技有限公司 | Forming structure and method of surface-mounted inductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797165A (en) * | 2019-12-06 | 2020-02-14 | 汕头市信技电子科技有限公司 | Forming structure and method of surface-mounted inductor |
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| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Danna Inventor before: Zhuang Zhongzheng Inventor before: Wang Danna |