Side lead type magnetic device

Abstract

The invention provides a side lead type magnetic device. The side lead type magnetic device comprises a magnet, a winding, a shell and a plurality of terminals. The shell is provided with a wire protection groove and a bearing platform outside the accommodating cavity; each terminal extends into the bearing platform of the shell, one end of each terminal extends out of the platform surface of the bearing platform and is lower than the top wall of the shell, the other end of each terminal is exposed out of the bottom surface of the bearing platform, and a lead of the winding extends to the platform surface of the bearing platform through a wire outlet groove in the bottom of the shell and a wire protection groove in the outer side of the shell in sequence and is electrically connected with the corresponding terminal. Therefore, the electric connection position of the lead end part of the winding and the terminal is far away from the coil body of the winding, so that the risk that a paint film of the terminal is burnt back and intrudes into the coil body can be reduced, and the problem of poor insulation and voltage resistance of the coil body caused by burn-back can be improved; in addition, the electric connection position of the lead end part of the winding and the terminal is positioned on the outer side of the shell, so that the appearance quality control on the electric connection effect of the position is facilitated.

Description

Technical Field

[0001] The present application relates to the field of magnetic devices, and particularly to a side-lead magnetic device. Background Art

[0002] With the rapid development of technology, especially the emergence of multifunctional devices, the demand for passive devices is increasing. As one of the passive components, magnetic devices have been widely used. A magnetic device at least includes a magnet, a winding, and terminals (also known as "external terminals", "external electrodes", "end electrodes"). The terminals mainly perform two functions. One is as a wiring part, electrically connected to the lead of the winding, and the other is as an electrode, electrically connected to a circuit board (such as a PCB, i.e., Printed Circuit Board).

[0003] The terminals need to be mounted on the circuit board, so they are usually arranged at the bottom of the magnetic device. In the existing magnetic devices, the leads of the winding extend from the inside of the magnetic device to the bottom of the magnetic device and are electrically connected to its terminals, which results in a relatively short distance between the end of the lead of the winding and the winding. When the terminals are immersed in solder and demolded, the paint film of the lead is prone to back-burning and invade the coil body of the winding, resulting in poor insulation withstand voltage of the coil body. In addition, the electrical connection position between the lead and the terminal is at the bottom of the magnetic device and is usually blocked by structural parts such as a housing, making it difficult to control the appearance quality of the electrical connection effect at this position. Summary of the Invention

[0004] In view of this, the present application provides a side-lead magnetic device, which can improve the problems of poor insulation withstand voltage of the winding caused by back-burning of the paint film during tin immersion and demolding of the terminals, and the difficulty in controlling the appearance quality of the electrical connection effect between the leads and the terminals.

[0005] A side-lead magnetic device provided by the present application includes:

[0006] A magnet;

[0007] A winding wound around the magnet to form a magnetic circuit;

[0008] A housing provided with a receiving cavity, an outgoing line groove, a wire protection groove, and two bearing platforms. The magnet and the winding are arranged in the receiving cavity. The top of the receiving cavity is closed by the top wall of the housing. The outgoing line groove is arranged at the bottom of the cavity wall of the receiving cavity. The two bearing platforms are arranged on the periphery of the receiving cavity and are oppositely arranged in a first direction. The table surface of the bearing platform is lower than the top wall of the housing in a second direction. The end of each bearing platform extends beyond the cavity wall of the receiving cavity in a third direction. The wire protection groove is formed at the joint of the bearing platform and the cavity wall of the receiving cavity and is communicated with the outgoing line groove;

[0009] A plurality of terminals, each terminal extending into the base, with one end extending out of the top surface of the base and being lower than the top wall of the housing, and the other end being exposed outside the bottom surface of the base; the leads of the winding sequentially extend to the top surface of the base via the wire outlet groove and the wire protection groove and are electrically connected to the corresponding terminals.

[0010] Optionally, the winding includes two coils arranged oppositely in a first direction; the magnetic device further includes an insulating partition, and the insulating partition is arranged between the two coils.

[0011] Optionally, the magnetic device further includes a protective sheet made of an insulating material, and the protective sheet is arranged at the bottom of the housing and closes the opening at the bottom of the accommodating cavity to shield the coils of the winding.

[0012] Optionally, a colloid is arranged on one side of the magnetic device corresponding to the top wall of the housing, and the colloid adhesively fixes the coils of the winding and the insulating partition in the accommodating cavity.

[0013] Optionally, the terminal includes at least one main body portion, a wiring portion, and an external connection portion; the main body portion extends into the base, and a plurality of protrusions protruding outward are arranged on at least one side of each main body portion. An introduction angle and an anti - detachment angle are formed between the protrusion and the corresponding side of the main body portion. Along the opposite direction of the second direction, the introduction angle is an acute angle, and the anti - detachment angle cooperates with the base to block the main body portion from moving along the second direction; the wiring portion is arranged at one end of one main body portion and is electrically connected to the lead of the winding; the external connection portion is arranged at one end of one main body portion and is used for electrically connecting to a circuit board.

[0014] Optionally, the terminal includes at least one main body portion, a wiring portion, an external connection portion, and an extension portion; the main body portion extends into the base; the wiring portion is arranged at one end of one main body portion and is electrically connected to the lead of the winding; the external connection portion is arranged at one end of one main body portion and is used for electrically connecting to a circuit board; one end of the extension portion is arranged on one side of the external connection portion, and after being bent, the other end of the extension portion faces the top surface of the base along the second direction and is externally exposed and attached to the side surface of the base.

[0015] Optionally, the extension portion includes a first part and a second part. The first part is arranged on the same layer as the external connection part. The first part includes a first sub - part and a second sub - part, and is sequentially connected between the external connection part and the second part. The thickness of the first sub - part is greater than that of the second sub - part. The second part is perpendicular to the second sub - part, and the thicknesses of the second part and the second sub - part are both smaller than the thickness of the external connection part or the first sub - part. The second part extends along the extension direction of the main body part and is perpendicular to the main body part, and is externally attached to the side of the bearing platform away from the cable trough.

[0016] Optionally, the external connection part is located at the other end of the corresponding terminal and extends out of the bottom surface of the bearing platform, and the external connection part has the same extension direction as the corresponding main body part and they are in the same plane.

[0017] Optionally, each terminal includes a first main body part and a second main body part arranged oppositely. The external connection part is arranged at the first end of the first main body part and the first end of the second main body part, and is perpendicular to the extension directions of both the first main body part and the second main body part. The external connection part connects the first main body part and the second main body part and is externally attached to the bottom surface of the bearing platform.

[0018] Optionally, the wiring part is arranged at the second end of the first main body part. The height of the first main body part is greater than that of the second main body part. The wiring part is externally exposed from the bearing platform, and the second end of the second main body part is not externally exposed from the bearing platform.

[0019] As described above, in the side - leaded magnetic device of the present application, each terminal extends into the bearing platform of the housing, and one end extends out of the tabletop of the bearing platform and is lower than the top wall of the housing, and the other end is externally exposed from the bottom surface of the bearing platform. The leads of the winding sequentially extend to the tabletop of the bearing platform via the wire outlet groove at the bottom of the housing and the cable trough outside the housing, and are electrically connected to the corresponding terminals. In this way, the electrical connection position between the lead end of the winding and the terminal is far from the coil body of the winding, which can reduce the risk of the terminal paint film back - burning invading the coil body, thereby improving the problem of poor insulation withstand voltage of the coil body caused thereby; in addition, the electrical connection position between the lead end of the winding and the terminal is located outside the housing, which is beneficial to the appearance quality control of the electrical connection effect at this position. Description of the Drawings

[0020] Figure 1 and Figure 2 are three - dimensional structure schematic diagrams of two perspectives of the first magnetic device of the first embodiment of the present application;

[0021] Figure 3 is Figure 1 and Figure 2 the structural explosion schematic diagram of the magnetic device shown;

[0022] Figure 4 is Figure 3 A three-dimensional structural schematic diagram of the terminal of the magnetic device shown;

[0023] Figure 5 is Figure 4 A side view of one of the terminals shown;

[0024] Figure 6 A structural schematic diagram of the second magnetic device according to the first embodiment of the present application;

[0025] Figure 7 is Figure 6 A three-dimensional structural schematic diagram of one of the terminals of the magnetic device shown;

[0026] Figure 8 is Figure 7 A side view of the terminal shown;

[0027] Figure 9 A structural schematic diagram of the third magnetic device according to the first embodiment of the present application;

[0028] Figure 10 is Figure 9 A three-dimensional structural schematic diagram of one of the terminals of the magnetic device shown;

[0029] Figure 11 is Figure 10 A side view of the terminal shown;

[0030] Figure 12 A structural schematic diagram of the magnetic device assembled with the circuit board according to the second embodiment of the present application;

[0031] Figure 13 is Figure 12 An exploded structural schematic diagram of the magnetic device shown;

[0032] Figure 14 is Figure 12 A structural schematic diagram of one of the terminals of the magnetic device shown;

[0033] Figure 15 is Figure 14 A side view of the terminal shown.

[0034] The first direction x, the second direction y, the third direction;

[0035] Magnetic device 100, magnet / magnetic ring 1, winding 2, terminal 3, housing 4, lead 20, insulating partition 5, protective sheet 6; first terminal 3a, second terminal 3b, pre-positioning 30, main body part 31, wiring part 32, external connection part 33, barb 311, first branch 321, second branch 322, third branch 323, branch 324, notch 325, first main body part 312, second main body part 313, extension part 34, solder 340, first part 341, second part 342, first sub-part 3411, second sub-part 3412; mounting hole 41, wire outlet groove 42, wire protection groove 43, bearing platform 44, combination body 45, top wall 401, colloid 402, table top 440, circuit board 200. Detailed implementation mode

[0036] To solve the above-mentioned technical problems existing in the prior art, the side-lead type magnetic device of the present application includes a magnet, a winding, a housing, and a plurality of terminals. Each terminal extends into the bearing platform of the housing, and one end extends out of the table top of the bearing platform and is lower than the top wall of the housing, and the other end is exposed outside the bottom surface of the bearing platform. The leads of the winding sequentially extend to the table top of the bearing platform through the wire outlet groove at the bottom of the housing and the wire protection groove outside the housing, and are electrically connected to the corresponding terminals. Hereby, the electrical connection position between the end of the lead of the winding and the terminal is far from the coil body of the winding, thereby reducing the risk of the varnish film of the terminal burning back and invading the coil body, and improving the problem of poor insulation withstand voltage of the coil body caused thereby; in addition, the electrical connection position between the end of the lead of the winding and the terminal is located outside the housing, which is beneficial to the appearance quality control of the electrical connection effect at this position.

[0037] Among them, the specific manifestation forms of parameters such as the shape, quantity, size, etc. of any one of the magnet, winding, housing, terminal, and bearing platform can be determined according to the actual scenario requirements, and the present application does not limit them.

[0038] To make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly described below in combination with specific embodiments and the corresponding drawings. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all the embodiments. Without conflict, the technical features of the following various embodiments can be combined with each other, and they also belong to the technical solution of the present application.

[0039] In the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for facilitating the description of the technical solutions of the corresponding embodiments, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation to the present application.

[0040] First Embodiment

[0041] The side-lead magnetic device is also called a magnetic device. Please refer to Figures 1 to 3 As shown, the magnetic device 100 of this example includes a magnet 1, a winding 2, several terminals 3, and a housing 4. The number of the terminals 3 provided in the present application can be determined adaptively according to the type of the magnetic device 100. For example, Figures 1 to 3 the magnetic device 100 shown in

[0042] For the convenience of description and understanding, with reference to Figures 1 to 5 the orientation shown, the width direction of the magnetic device 100 is called the first direction x, the height direction is called the second direction y, and the thickness direction is called the third direction z. The first direction x, the second direction y, and the third direction z are perpendicular to each other in pairs and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that throughout the present application, the so-called perpendicular does not require the angle between the two to be exactly 90°, but allows a deviation of, for example, ±10°, that is, the so-called perpendicular can be understood as the angle between any two directions being 80° to 100°. Similarly, throughout the present application, the so-called parallel does not require the angle between the two to be exactly 0° or 180°, but allows a deviation of, for example, ±10°, that is, the so-called parallel can be understood as the angle between any two directions being 0° to 10° or 170° to 190°.

[0043] The magnet 1 can be a ring-shaped magnetic member with a circular x-z cross-section, which can be called a magnetic ring 1. It is made of traditional soft magnetic materials in the art, and an insulating layer is provided on the surface of the magnet 1. The magnet 1 shown in the drawings of the present application is only an exemplary display, and other examples can also be polygons such as octagons.

[0044] The winding 2 may include two coils, for example, formed by winding a lead 20 of a type such as enameled wire. The leads 20 of each coil are wound around the magnetic ring 1 turn by turn to form a magnetic circuit. The winding method depends on the adaptability. After winding, the two coils are arranged opposite to each other in the first direction x. The so-called opposite arrangement means that there is no contact between the two main bodies, that is, there is a non-zero distance. The end of the lead 20 can extend outside the magnetic ring 1 and be electrically connected to the corresponding terminal 3. For example, welding can be used to achieve the electrical connection. In Figures 1 to 3 In the example of, the winding 2 is provided with four lead 20 ends, and the magnetic device 100 is provided with four terminals 3. The shapes of these four terminals 3 are different. For the convenience of description, the present application may call two identical ones the first terminals 3a, and the other two identical ones the second terminals 3b, and the structures of the first terminals 3a and the second terminals 3b may be completely symmetrically arranged. Among them, two ends of the lead 20 are respectively welded to the two second terminals 3b in a one-to-one correspondence; the remaining two ends of the lead 20 are respectively welded to the two first terminals 3a in a one-to-one correspondence.

[0045] As Figure 3 shown, an insulating partition 5 may be provided between the two coils. It is made of an insulating material and is used to separate the two coils to avoid interference between the two coils. Of course, when the distance between the two coils is large enough, the magnetic device 100 may not be provided with the insulating partition 5.

[0046] The housing 4 may be a plastic part and is provided with a receiving cavity, a mounting hole 41, a wire outlet groove 42, and a wire protection groove 43. The top of the receiving cavity is closed by the top wall 401 of the housing 4. The bottom of the receiving cavity is of an open design, that is, an opening is provided to serve as a part of the bottom of the housing 4 for mounting and exposing the winding 2. In addition, two bearing platforms 44 are provided at the periphery of the receiving cavity and adjacent to the top wall 401, and the two are arranged opposite to each other in the first direction x; the mounting hole 41 is a through hole penetrating the bearing platform 44 in the second direction y. The x-z cross-sectional shape of the mounting hole 41 is adapted to the x-z cross-sectional shape of the corresponding terminal 3. For example, a serrated structure may be provided in the mounting hole 41 to be adapted to the spurs 311 of each terminal 3 shown in the figure. The ends of each bearing platform 44 extend beyond the cavity wall of the receiving cavity in the third direction z. The wire protection groove 43 is formed at the junction of the bearing platform 44 and the cavity wall of the receiving cavity, and the wire outlet groove 42 is provided at the bottom of the cavity wall of the receiving cavity and is communicated with the wire protection groove 43.

[0047] Referring together to Figure 4 and Figure 5 , it shows a single terminal (which can be simply called "end electrode" or "external terminal") 3 of the present application, including a main body portion 31, a wiring portion 32, and an external connection portion 33.

[0048] On at least one side of the main body portion 31, a plurality of outwardly protruding spikes 311 are provided. In Figure 4 and Figure 5 the example of, on both sides of the main body portion 31 along its width direction (i.e., along the third direction z), a plurality of spikes 311 are provided. The plurality of spikes 311 on either side of the main body portion 31 are arranged opposite to each other in sequence along the second direction y, and the distance between two adjacent ones can be equal to achieve uniform distribution. An introduction angle α and an anti - detachment angle β are formed between each spike 311 and the corresponding side of the main body portion 31, and along the direction in which the main body portion 31 is inserted into the magnetic device 100 (i.e., along the opposite direction of the second direction y or the gravity direction), the introduction angle α is an acute angle.

[0049] The wiring portion 32 is provided at one end of the main body portion 31, such as the upper end or the top end in the orientation shown in the figure, and is used for electrically connecting with the lead 20 of the winding 2 of the magnetic device 100. The external connection portion 33 is provided at one end of the main body portion 31, such as the lower end or the bottom end in the orientation shown in the figure, and is used for electrically connecting with the circuit board. The external connection portion 33 has the same extension direction as the corresponding main body portion 31, both are parallel to the second direction y, and the two are located in the same plane, so that each terminal 3 is a sheet - like electrode, which is suitable for the plug - in type magnetic device 100.

[0050] Each main body portion 31 can be inserted into the corresponding mounting hole 41 of the housing 4 along the second direction y. The serrated structure in the mounting hole 41 only allows the spike 311 to be inserted along the insertion direction and abuts against the anti - detachment angle β to block the spike 311 from detaching from the mounting hole 41 along the opposite direction of the insertion direction. The external connection portion 33 extends to the outside of the housing 4 through the bottom of the housing 4 and can be electrically connected to the circuit board by a plug - in method. In other examples, the housing 4 can be formed by injection molding to enclose each main body portion 31. Of course, other methods or structures can also be adopted in this application to enable each main body portion 31 to extend into the housing 4 along the second direction y.

[0051] Based on this, each terminal 3 extends into the bearing platform 44, and one end extends out of the table surface 440 of the bearing platform 44 and is lower than the top wall 401 of the housing 4, and the other end is exposed outside the bottom surface of the bearing platform 44. In addition, along the direction in which the main body portion 31 is inserted into the housing 4, the acute - angled introduction angle α of the spike 311 is beneficial for the terminal 3 to be inserted into the housing 4 for convenient installation. The anti - detachment angle β of the spike 311 can cooperate with the housing 4, so that the housing 4 applies at least a force opposite to the insertion direction to the spike 311 to block the terminal 3 from moving in the opposite direction of the insertion direction. Therefore, the loosening of the terminal 3 relative to the magnet 1 and the housing 4 is avoided, thereby reducing the risk of electrical connection failure between the terminal 3, the lead 20 and the circuit board.

[0052] In one example, the spike 311 satisfies at least one of the following:

[0053] The introduction angle α satisfies 10° ≤ α ≤ 35°;

[0054] The anti - detachment angle β satisfies 60° ≤ β ≤ 130°;

[0055] The height difference between the protrusion 311 and the corresponding side is H. The protrusion height of the protrusion 311 can be regarded as H, and 0.03 mm ≤ H ≤ 0.3 mm;

[0056] The convex - point corner radius of the protrusion 311 is R, and 0 mm ≤ R ≤ 0.1 mm. Among them, the convex - point of the protrusion 311 is optimally designed with a sharp angle.

[0057] Based on the above - mentioned corresponding threshold ranges, in this example, while facilitating the insertion and installation of the terminal 3 and making it not easy to loosen, it can also ensure that each protrusion 311 has a high structural strength.

[0058] Continue to refer to Figures 1 to 3 , after the winding 2 and the magnet 1 are fitted, they are installed in the accommodating cavity from the opening at the bottom of the housing 4. On one side of the accommodating cavity corresponding to the top wall 401, a colloid 402 can be provided. This colloid 402 bonds and fixes the two coils of the winding 2 and the insulating partition 5 in the accommodating cavity of the housing 4. In an example, a protective sheet 6 can be provided at the bottom of the accommodating cavity of the magnetic device 100. It is made of an insulating material and is arranged on the surface of the winding 2 coil facing the external connection part 33 to shield the winding 2 coil, improving the defect that when soldering the external connection part 33 to the circuit board, the solder splash hits the coil body, resulting in poor insulation withstand voltage of the coil body.

[0059] The ends of the leads 20 of each coil of the winding 2 extend from the corresponding wire outlet grooves 42 to the outside of the housing 4 and extend along the wire protection grooves 43 on the outside of the housing 4 to the tabletop 440 of the bearing platform 44, so as to be connected to the wiring part 32 of the corresponding main body part 31, and the joint of the lead 20 end and the wiring part 32 can be wrapped by a bonding body 45 such as solder. The tabletop 440 of the bearing platform 44 is lower than the top wall 401 of the housing 4, so that the top ends of each main body part 31 after being wound with the lead 20 ends are also lower than the top wall 401 of the housing 4. Finally, the joint of the lead 20 end and the wiring part 32 is also lower than the top wall 401 of the housing 4, reducing the risk of the joint being collided by the outside world, thereby being beneficial to the stability of the electrical connection.

[0060] Moreover, the electrical connection position between the end of the lead 20 of the winding 2 and the terminal 3 is far from the coil body of the winding 2, which can reduce the risk of the terminal 3 paint film back - burning invading the coil body, thereby improving the problem of poor insulation withstand voltage of the coil body caused by this; in addition, the electrical connection position between the end of the lead 20 of the winding 2 and the terminal 3 is located outside the housing 4, which is beneficial to the appearance quality control of the electrical connection effect at this position.

[0061] Please continue to refer to Figure 5, chamfers θ are provided on opposite sides of the external connection portion 33 of each terminal 3 along its width direction, and along the insertion direction, the chamfer θ is an acute angle, so that the width of the external connection portion 33 gradually decreases along the extension direction, facilitating the insertion and installation of each terminal 3 into the housing 4. In one example, the chamfer θ satisfies: 10° ≤ θ ≤ 45°. Additionally, in an actual scenario, for the chip terminal 3 shown in the figure, the insertion end of the external connection portion 33 includes four sides, so chamfers θ can be provided on its four sides respectively.

[0062] In Figures 1 to 5 the example of, at the junction of the wiring portion 32 and the main body portion 31 of each terminal 3, a pre-positioning portion 30 with a smaller width can be formed, and the end of the lead 20 is wound around the pre-positioning portion 30 to achieve electrical connection between the winding 2 coil and the corresponding terminal 3. Additionally, the wiring portion 32 and the main body portion 31 can be staggeredly arranged. When the main body portion 31 is inserted into the housing 4, the wiring portion 32 is away from the accommodation cavity, thereby facilitating the end of the lead 20 to be wound around the wiring portion 32 between the wiring portion 32 and the accommodation cavity.

[0063] This application does not limit the way of achieving electrical connection between the end of the lead 20 and the wiring portion 32. Correspondingly, the specific structure of the wiring portion 32 can be determined adaptively according to actual requirements.

[0064] For example, as shown in combination with Figures 6 to 8 , the wiring portion 32 can be vertically arranged on the side of the main body portion 31 away from the accommodation cavity and includes a first branch 321, a second branch 322, and a third branch 323. The first branch 321 is sheet-shaped and vertically arranged on one side of the main body portion 31. The second branch 322 and the third branch 323 are respectively connected to both sides of the first branch 321 along its width direction. When the end of the lead 20 extends to the first branch 321, the second branch 322 and the third branch 323 are respectively bent towards the end of the lead 20, and finally the end of the lead 20 is pressed and fixed on the first branch 321 to achieve electrical connection between the end of the lead 20 and the wiring portion 32. The bent second branch 322 and third branch 323 are arranged side by side along the thickness direction of the main body portion 31 to enhance the pressing and fixing effect on the end of the lead 20.

[0065] Another example, as shown in combination with Figures 9 to 11 , the wiring portion 32 can include two opposite branches 324. One of the branches 324 is arranged opposite to the side of the main body portion 31 to form a notch 325. The end of the lead 20 extends to the notch 325 through the space between the wiring portion 32 and the cavity wall of the accommodation cavity, then extends to the other branch 324 through the side of the wiring portion 32 away from the accommodation cavity, and then surrounds the other branch 324 and extends through the space between the wiring portion 32 and the cavity wall of the accommodation cavity, and finally is clamped and fixed between the two branches 324 to achieve electrical connection between the end of the lead 20 and the wiring portion 32.

[0066] Second Embodiment

[0067] In the present application, structural elements with the same name are identified with the same reference numerals. Based on the description of the foregoing first embodiment, the difference lies in that, as shown in combination with Figures 12 to 15 each terminal 3 of this second embodiment includes two relatively arranged main body portions 31, respectively referred to as a first main body portion 312 and a second main body portion 313, and the two are relatively arranged along the third direction z in the figure.

[0068] The external connection portion 33 is disposed at the first end (i.e., the lower end or the bottom end) of the first main body portion 312 and the first end (i.e., the lower end or the bottom end) of the second main body portion 313, and is perpendicular to both the extending direction of the first main body portion 312 (i.e., the second direction y) and the extending direction of the second main body portion 313, thereby connecting the first end of the first main body portion 312 and the first end of the second main body portion 313. The external connection portion 33 is externally exposed and attached to the bottom of the magnetic device 100, specifically externally exposed and attached to the bottom surface of the bearing platform 44 of the housing 4. The magnetic device 100 in this embodiment is equivalent to a surface-mounted magnetic device 100, and the external connection portion 33 can be regarded as a patch electrode or a patch pin of the magnetic device 100.

[0069] The wiring portion 32 is disposed at the second end of the first main body portion 312, that is, the upper end or the top end.

[0070] The height of the first main body portion 312 is greater than the height of the second main body portion 313. The so-called height refers to the length along the second direction y, so that the wiring portion 32 can be externally exposed from the housing 4 of the magnetic device 100, specifically externally exposed to the tabletop 440 of the bearing platform 44, while the second end of the second main body portion 313 is not externally exposed from the housing 4.

[0071] In this embodiment, both of the two main body portions 31 are provided with barbs 311, so that the cooperation stability between the terminal 3 and the housing 4 is better, the risk of loosening in the magnetic device 100 is lower, and the risk of electrical connection failure is lower. In other examples, the barbs 311 may be provided only on one of the main body portions 31. Additionally, any one of the main body portions 31 may have the barbs 311 provided only on one side thereof.

[0072] The terminal 3 of this embodiment further includes an extension portion 34. One end of the extension portion 34 is disposed on one side of the external connection portion 33, and after being bent, the other end of itself faces the tabletop 440 of the bearing platform 44 along the second direction y and is externally exposed and attached to the side surface of the bearing platform 44, so as to be externally exposed and attached to the side of the magnetic device 100.

[0073] Different from the first embodiment where it is inserted into the housing 4 from the top of the housing 4, in this second embodiment, each main body portion 31 is inserted into the housing 4 from the bottom of the housing 4 for assembly to the magnetic device 100. When the terminal 3 is assembled to the magnetic device 100, the extension portion 34 can be externally attached to the side surface of the magnetic device 100. When soldering the external connection portion 33 to the circuit board 200 for SMT mounting, the solder 340 used for soldering will have a phenomenon of solder wicking, that is, the solder will overflow towards the extension portion 34 and adhere to the outer surface of the extension portion 34. Therefore, the finally solidified solder 340 will be exposed on the extension portion 34 of each terminal 3. When using AOI (Automated Optical Inspection) technology, the AOI inspection device can collect the image of the solder 340 along the gravity direction (i.e., the opposite direction of the second direction y), and judge whether the soldering quality is qualified based on this, so as to effectively monitor the SMT quality.

[0074] Continue to refer to Figure 14 and Figure 15 , the extension portion 34 of this example includes a first portion 341 and a second portion 342. The first portion 341 is arranged on the same layer as the external connection portion 33, and the second portion 342 is oppositely arranged along the first direction x with respect to both the first main body portion 312 and the second main body portion 313. The first portion 341 includes a first sub-portion 3411 and a second sub-portion 3412, and the first sub-portion 3411 and the second sub-portion 3412 are sequentially connected between the external connection portion 33 and the second portion 342. The thickness of the first sub-portion 3411 is greater than the thickness of the second sub-portion 3412. Optionally, the thickness of the second portion 342 is equal to the thickness of the second sub-portion 3412, and the thickness of the first sub-portion 3411 is equal to the thickness of the external connection portion 33; the second portion 342 is perpendicular to the second sub-portion 3412, and the thicknesses of both the second portion 342 and the second sub-portion 3412 are less than the thickness of the external connection portion 33 and also less than the thickness of the first sub-portion 3411. The second portion 342 extends along the extension direction of the main body portion 31 and is perpendicular to the corresponding main body portion 31, and is externally attached to the side of the bearing platform 44 away from the wire protection groove 43, so as to be externally attached to the side of the magnetic device 100.

[0075] Based on the above, the first part 341 of the extension part 34 and the external connection part 33 can be equivalent to the patch electrodes of the magnetic device 100, and realize electrical connection with the circuit board 200 in a patch manner. Since the second part 342 of the extension part 34 extends to the side of the magnetic device 100 that can be externally attached through the external connection part 33 and the first part 341, which is equivalent to that the patch electrode can reach the outermost side of the housing of the magnetic device 100, and the thickness of the second part 342 is small, therefore, when welding the external connection part 33 and the circuit board 200 to perform SMT mounting, the solder 340 used for welding will produce a solder climbing phenomenon, that is, the solder will overflow towards the extension part 34 and adhere to the outer surface of the extension part 34. Therefore, the finally solidified solder 340 will be exposed on the extension part 34 of each terminal 3. When using the AOI technology, the AOI device can collect the solder 340 image along the gravity direction (i.e., the opposite direction of the second direction y), which is beneficial for vertical AOI detection and determination to judge whether the welding quality is qualified, and realize effective monitoring of the SMT quality.

[0076] In addition, the thicknesses of both the second part 342 and the second sub - part 3412 are small, which not only facilitates the bending of the second part 342 relative to the second sub - part 3412, but also a notch is formed between the connection of these two parts and the first sub - part 3411, and the housing 4 of the magnetic device 100 can be stably connected to this notch, which is beneficial for the stable assembly of the terminal 3 and the housing 4 at the bottom of the magnetic device 100.

[0077] In one example, the widths of the extension part 34 and the external connection part 33 can be equal, that is, the widths of the first part 341 (including the first sub - part 3411 and the second sub - part 3412) and the second part 342 can be equal to the width of the external connection part 33. The width refers to the length along the direction perpendicular to the main body part 31 and parallel to the external connection part 33 (i.e., along the third direction z). Herein, when the extension part 34 and the external connection part 33 are in an unbent strip - like structure, this strip - like structure can be a conductive strip with equal width but unequal thickness, and this conductive strip is easy to bend at the second sub - part 3412 with a smaller thickness to form the illustrated structure.

[0078] In one example, the extension part 34 satisfies at least one of the following:

[0079] The thickness of the second part 342 is E1, and E1 ≤ 0.2 mm;

[0080] The thickness of the second sub - part 3412 is E2, and E2 ≤ 0.2 mm;

[0081] The connection between the second part 342 and the second sub - part 3412 is a rounded corner, and the outer radius of the rounded corner is R, and R ≤ 0.5 mm, preferably R ≤ 0.25 mm.

[0082] In the direction from the outer circumferential portion 33 to the second portion 342, that is, in the direction parallel to the first direction x, the width of the second sub-portion 342 is F, where F ≥ 0.1 mm.

[0083] Based on the above corresponding threshold ranges, in this embodiment, while facilitating the vertical AOI detection of the terminal 3 and its assembly with the housing 4, the extension portion 34 can also ensure relatively high structural strength.

[0084] The above are only some embodiments of the present application, and thus do not limit the patent scope of the present application. For those of ordinary skill in the art, any equivalent structural transformation made using the content of this specification and the drawings shall similarly be included within the patent protection scope of the present application.

[0085] Although terms such as "first" and "second" are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. Additionally, the singular forms "a", "an", and "the" are also intended to include the plural forms. The terms "or" and "and / or" are interpreted as inclusive, meaning either one or any combination. An exception to this definition only occurs when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

Claims

1. A side lead type magnetic device, characterized in that: include: magnet; A winding, wound on the magnet to form a magnetic circuit; A shell is provided with a receiving cavity, a wire outlet groove, a wire protection groove and two supporting platforms, the magnet and the winding are arranged in the receiving cavity, the top of the receiving cavity is closed by the top wall of the shell, the wire outlet groove is arranged at the bottom of the cavity wall of the receiving cavity, two supporting platforms are arranged at the periphery of the receiving cavity and are arranged opposite to each other along a first direction, the table surface of the supporting platform is lower than the top wall of the shell along a second direction, the end of each supporting platform extends beyond the cavity wall of the receiving cavity along a third direction, the wire protection groove is formed by the joint of the supporting platform and the cavity wall of the receiving cavity, and is connected with the wire outlet groove; A plurality of terminals, each of which extends into the support platform, and one end extends out of the surface of the support platform and is lower than the top wall of the shell, and the other end is exposed on the bottom surface of the support platform; the lead wires of the winding extend to the surface of the support platform through the wire outlet groove and the wire protection groove in sequence, and are electrically connected to the corresponding terminals.

2. The side lead type magnetic device according to claim 1, characterized in that: The winding comprises two coils arranged opposite to each other along a first direction; The magnetic device further includes an insulating spacer disposed between the two coils.

3. The side lead type magnetic device according to claim 1, characterized in that: The magnetic device further comprises a protective sheet made of insulating material, which is arranged at the bottom of the shell and closes the opening at the bottom of the accommodating cavity to shield the coil of the winding.

4. The side lead type magnetic device according to claim 3, characterized in that: The magnetic device is provided with a colloid on one side corresponding to the top wall of the shell, and the colloid adheres and fixes the coil of the winding and the insulating partition in the accommodating cavity.

5. The side lead type magnetic device according to claim 1, characterized in that: The terminal comprises at least a main body portion, a wiring portion and an external connection portion; The main body extends into the support platform, and at least one side of each main body is provided with a plurality of thorns protruding outward, and an introduction angle and an anti-slip angle are formed between the thorns and the corresponding side of the main body, and in the opposite direction of the second direction, the introduction angle is an acute angle, and the anti-slip angle cooperates with the support platform to prevent the main body from moving along the second direction; The wiring part is arranged at one end of one of the main parts and is electrically connected to the lead wire of the winding; The external connection portion is arranged at one end of one of the main body portions and is used for being electrically connected to the circuit board.

6. The side lead type magnetic device according to claim 1, characterized in that: The terminal comprises at least a main body portion, a wiring portion, an external connection portion and an extension portion; The main body extends into the support platform; The wiring part is arranged at one end of one of the main parts and is electrically connected to the lead wire of the winding; The external connection part is arranged at one end of one of the main parts and is used for being electrically connected to the circuit board; One end of the extension portion is disposed on one side of the external connection portion, and after being bent, the other end of the extension portion is directed toward the table surface of the support platform along the second direction and exposed to fit the side surface of the support platform.

7. The side lead type magnetic device according to claim 6, characterized in that: The extension portion includes a first part and a second part, the first part is arranged at the same layer as the external connecting portion, the first part includes a first sub-part and a second sub-part, and is sequentially connected between the external connecting portion and the second part, the thickness of the first sub-part is greater than the thickness of the second sub-part; the second part is perpendicular to the second sub-part, and the thickness of the second part and the thickness of the second sub-part are both smaller than the thickness of the external connecting portion or the first sub-part, the second part extends along the extension direction of the main body and is perpendicular to the main body, and is exposed and attached to the side of the base away from the wire protection groove.

8. The side lead type magnetic device according to any one of claims 5 to 7, characterized in that: The external connection portion is located at the other end of the corresponding terminal and extends out of the bottom surface of the support platform, and the extension direction of the external connection portion is the same as that of the corresponding main body portion and the two are located in the same plane.

9. The side lead type magnetic device according to any one of claims 5 to 7, characterized in that: Each of the terminals comprises a first main body portion and a second main body portion which are arranged opposite to each other; The external connection portion is arranged at the first end of the first main body portion and the first end of the second main body portion, and is perpendicular to the extension direction of the first main body portion and the second main body portion; the external connection portion connects the first main body portion and the second main body portion, and is exposed and attached to the bottom surface of the support platform.

10. The side lead type magnetic device according to claim 9, characterized in that: The wiring portion is arranged at the second end of the first main body; The height of the first main body is greater than that of the second main body, the connection portion is exposed on the support platform, and the second end of the second main body is not exposed on the support platform.

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