Magnetic device

Abstract

The utility model relates to the technical field of electronic components, and discloses a magnetic device, which comprises a support body, the axis of which is parallel to a first direction; the magnets are connected with the supporting body, a closed magnetic circuit is formed in each magnet, a mounting gap is formed between the magnets, and each magnet is provided with a side magnetic leakage surface which is far away from the mounting gap and is perpendicular to the first direction, a front end working surface connected with the side magnetic leakage surface and a bottom welding surface which is perpendicular to the front end working surface and the side magnetic leakage surface; the metal bodies are connected to the magnets, the metal bodies partially cover the front end working faces, the side magnetic leakage faces and the bottom welding faces, the metal bodies are arranged on the front end working faces, the side magnetic leakage faces and the bottom welding faces in a plane mode, the metal bodies on the front end working faces are connected with winding coil connectors in the magnets, and the metal bodies on the side magnetic leakage faces are connected with winding coil connectors in the magnets. And the metal body on the bottom welding surface is used as an electrode external pin. Magnetic leakage of the magnetic device is reduced, and the performance of the magnetic device is improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic components, and particularly to a magnetic device. Background Art

[0002] With the development of power electronics technology, especially the progress in the field of audio equipment, consumers' requirements for its performance are increasing day by day. Whether it is consumer products such as digital music players, smart speakers, and high-fidelity audio systems, or professional audio fields such as recording studios, live performances, and broadcast systems, there are more stringent standards for the quality of audio signals and noise control. Magnetic devices are indispensable as key components in these devices. At the same time, with the rapid development of the automotive electronics industry, the market's requirements for the flatness of the electrodes of magnetic devices have also increased significantly. For example, inductive components play a crucial role in signal processing, filtering, and impedance matching in the above application scenarios.

[0003] In related technologies, the magnetic leakage phenomenon of magnetic devices has always been the main problem affecting their performance. Especially in high-frequency and high-power applications, the magnetic leakage problem will cause energy loss and electromagnetic interference. In addition, the flatness and cleanliness of its electrodes directly affect the tinning rate of the electrodes, thereby affecting the reliability and performance stability of the product. Therefore, how to design a magnetic device that can reduce the magnetic leakage phenomenon while ensuring the flatness and cleanliness of the electrodes has become a technical problem that needs to be solved urgently. Summary of the Utility Model

[0004] In view of this, this application provides a magnetic device to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted is as follows:

[0006] A magnetic device, comprising:

[0007] A support body, the axis of which is parallel to the first direction;

[0008] A magnet, connected to the support body, and a closed magnetic circuit is formed inside it. There is an installation gap between the magnets. The magnet has a side magnetic leakage surface away from the installation gap and perpendicular to the first direction, a front working surface connecting the side magnetic leakage surface, and a bottom welding surface perpendicular to the front working surface and the side magnetic leakage surface respectively;

[0009] A metal body, connected to each magnet, the metal body partially covers the front working surface, the side magnetic leakage surface, and the bottom welding surface, and the metal body is arranged in a plane on the front working surface, the side magnetic leakage surface, and the bottom welding surface. The metal body on the front working surface is connected to the winding coil joint in the magnet, and the metal body on the bottom welding surface serves as an electrode external lead.

[0010] The present application is further configured such that: the metal body includes a coil electrode portion, a side electrode portion, and a bottom electrode portion that are integrally connected. The coil electrode portion is attached to the front working surface, the side electrode portion is attached to the side magnetic leakage surface and is perpendicular to the coil electrode portion, and the bottom electrode portion is attached to the bottom welding surface and is perpendicular to the side magnetic leakage surface.

[0011] The present application is further configured such that: arc chamfers are provided at the connection between the coil electrode portion and the side electrode portion, and at the connection between the side electrode portion and the bottom electrode portion.

[0012] The present application is further configured such that: it further includes an adsorption protection layer. The adsorption protection layer is provided at one end of the magnet facing away from the bottom welding surface. The adsorption protection layer covers the installation gap and connects each magnet.

[0013] The present application is further configured such that: the area ratio range of the side electrode portion covering the side magnetic leakage surface includes 20% - 98%.

[0014] The present application is further configured such that: the bottom electrode portion extends along the first direction on the bottom welding surface, the side electrode portion extends along the third direction on the side magnetic leakage surface, and the metal bodies on each magnet are symmetrically arranged in the second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0015] The present application is further configured such that: the length of the coil electrode portion in the first direction ≤ 0.8 times the length of the magnet in the first direction.

[0016] The present application is further configured such that: the length of the side electrode portion in the second direction < 0.5 times the length of the magnet in the second direction.

[0017] The present application is further configured such that: on each magnet, adjacent side electrode portions have an installation spacing, and the length of the installation spacing in the second direction ≥ 0.1 times the length of the magnet in the second direction.

[0018] The present application is further configured such that: the length of the coil electrode portion and / or the side electrode portion in the third direction < 0.8 times the length of the magnet in the third direction.

[0019] In summary, compared with the prior art, the present application discloses a magnetic device. The magnet is connected to the support body, there is an installation gap between the magnets, and the axis of the support body is parallel to the first direction. Then the magnet has a side leakage magnetic surface away from the installation gap and perpendicular to the first direction, a front working surface connecting the side leakage magnetic surface, and a bottom welding surface perpendicular to the front working surface and the side leakage magnetic surface respectively. Among them, the metal body partially covers the front working surface, the side leakage magnetic surface, and the bottom welding surface and is arranged in a plane. That is, through the above settings, the metal body on the bottom welding surface can be bent and assembled once as an electrode external lead, the metal body on the front working surface is connected to the winding coil joint in the magnet to serve as an electrode lead-out end, ensuring the cleanliness of the magnetic device electrodes. The metal body on the side leakage magnetic surface can reduce the magnetic leakage of the magnetic device, thereby improving the performance of the magnetic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of the first magnetic device of this embodiment;

[0022] Figure 2 is Figure 1 a schematic structural diagram of the magnetic device from another angle;

[0023] Figure 3 is a schematic structural diagram of the second magnetic device of this embodiment;

[0024] Figure 4 is Figure 3 a schematic structural diagram of the magnetic device in another direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0026] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including such element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined based on their explanations in the specific embodiments or further in combination with the context of the specific embodiments.

[0027] It should be understood that the specific embodiments described herein are merely for explaining the present application and are not used to limit the present application.

[0028] In subsequent descriptions, the use of suffixes such as "module", "component" or "unit" to represent elements is only for the convenience of explaining the present application, and they have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0029] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] The technical solutions shown in the present application will be described in detail below through specific embodiments. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0031] In related technologies, magnetic devices, such as inductors, usually adopt a vertically placed coil structure. According to Ampere's circuital law and Biot-Savart law, this structure causes the magnetic induction lines of the coil to be dense inside and sparse at both ends. Therefore, the magnetic leakage mainly concentrates at both ends of the device. This magnetic leakage distribution not only causes energy waste but also increases electromagnetic interference. And the electrodes of the inductor are usually led out from the bottom of the product. During the forming process, due to a certain gap when the mold closes, this will cause powder materials to remain on the electrodes, affecting welding and making the tinning rate of the electrodes unable to meet the expected requirements. And in the inductor structure, its electrodes need to be bent twice to form the bottom and side electrodes. Due to the springback effect of the electrode material, that is, the bent metal tries to return to its original state, this will cause the electrodes to arch after being led out at the bottom end of the device and bent once and then bent a second time to the side, affecting the quality and reliability of the device. Based on this, the present application discloses a magnetic device.

[0032] Please refer to Figures 1 to 4 , the magnetic device of the present application includes a support body 1, a magnet 2, and a metal body 7. The magnet 2 is connected to the support body 1. A closed magnetic circuit is formed inside the magnet 2, and the axis of the support body 1 is parallel to the first direction. Among them, there is an installation gap 3 between the magnets 2, and the magnet 2 has a side magnetic leakage surface 4, a front working surface 5, and a bottom welding surface 6.

[0033] Specifically, the side magnetic leakage surface 4 is far from the installation gap 3 and perpendicular to the first direction. The front working surface 5 is connected to the side magnetic leakage surface 4, and the bottom welding surface 6 is perpendicular to the front working surface 5 and the side magnetic leakage surface 4 respectively. Further, the metal body 7 is connected to each magnet 2. The metal body 7 partially covers the front working surface 5, the side magnetic leakage surface 4, and the bottom welding surface 6, and the metal body 7 is arranged in a plane on the front working surface 5, the side magnetic leakage surface 4, and the bottom welding surface 6.

[0034] Then for the magnetic device of the present application, the metal body 7 on the front working surface 5 is connected to the winding coil joint inside the magnet 2, and the metal body 7 on the bottom welding surface 6 serves as an electrode external lead. Thus, the part of the metal body 7 that serves as the lead-out end on the magnetic device and the part that serves as the external connection end are not coplanar. The metal body 7 can be regarded as being led out from the front working surface 5. This can ensure that when the mold of the magnetic device closes, powder materials will not remain on the electrodes, that is, will not remain on the metal body 7 on the bottom welding surface 6, thereby ensuring that the electrodes of the magnetic device are clean and tidy, ensuring good tinning rate, and thus ensuring the reliability and performance stability of the magnetic device.

[0035] Based on the magnetic leakage drawbacks of the aforementioned magnetic device, in this embodiment, the metal body 7 partially covers the front working surface 5, the side magnetic leakage surface 4, and the bottom welding surface 6. Then, during the operation of the magnetic device, the metal body 7 on the side magnetic leakage surface 4 can form an auxiliary magnetic field based on the eddy current generated by Faraday's law of electromagnetic induction, and use this auxiliary magnetic field to offset the influence of the external magnetic field, thereby reducing the magnetic leakage of the magnetic device and improving the performance of the magnetic device.

[0036] It should be noted that this embodiment constructs an X-Y-Z space coordinate system. Taking Figure 1 as an example, the X-axis direction can be regarded as the first direction, the Y-axis direction can be regarded as the second direction, and the Z-axis direction can be regarded as the third direction. The first direction can also be regarded as the left-right extension direction of the magnetic device, that is, the arrangement direction of the support body 1. The second direction can also be regarded as the front-back extension direction of the magnetic device, and the third direction can also be regarded as the up-down extension direction of the magnetic device. Of course, this embodiment is not limited to this. X-Y-Z can also be any other directions perpendicular to each other in space according to actual needs, which will not be elaborated here.

[0037] For the magnetic device of this application, taking the structural design of the magnet 2 as a rectangular body as an example, then the side magnetic leakage surface 4 is constructed parallel to the plane of the second direction and the third direction, that is, the side magnetic leakage surface 4 can be regarded as the left side or the right side of the magnet 2. The front working surface 5 is constructed parallel to the plane of the first direction and the third direction, that is, the front working surface 5 can be regarded as the front end face or the rear end face of the magnet 2. The bottom welding surface 6 is constructed parallel to the plane of the first direction and the second direction, that is, the bottom welding surface 6 can be regarded as the upper end face or the lower end face of the magnet 2.

[0038] It can be understood that the magnetic device of this application has a winding coil (not shown). The winding coil can be installed in the internal cavity of the magnet 2 and adopts a vertical coil structure. The axis of the winding coil is also parallel to the first direction, that is, the magnetic leakage end of the magnetic device is mainly concentrated on the side magnetic leakage surface 4.

[0039] In an application scenario, the number of magnets 2 is 2, and the support bodies 1 are symmetrically connected. A closed magnetic circuit is formed inside the two magnets 2, and the number of metal bodies 7 on each magnet 2 is also 2, which are also symmetrically connected to the magnet 2.

[0040] In an embodiment, the metal body 7 includes a coil electrode portion 8, a side electrode portion 9, and a bottom electrode portion 10 that are integrally connected. Specifically, the coil electrode portion 8 is attached to the front working surface 5, the side electrode portion 9 is attached to the side magnetic leakage surface 4 and is perpendicular to the coil electrode portion 8, the bottom electrode portion 10 is attached to the bottom welding surface 6 and is perpendicular to the side magnetic leakage surface 4, and the coil electrode portion 8, the side electrode portion 9, and the bottom electrode portion 10 can all be arranged in a plane.

[0041] During the normal assembly and operation of the magnetic device of the present application, the coil electrode portion 8 attached to the front working surface 5 is connected to the winding coil joint in the magnet 2, which can be regarded as the electrode lead-out end of the magnetic device, while the bottom electrode portion 10 is attached to the bottom welding surface 6 as the external electrode pin. Thus, the part of the metal body 7 serving as the lead-out end and the part serving as the external connection end on the magnetic device are not coplanar, so that the powder material will not remain on the bottom electrode portion 10 when the mold is closed, thereby ensuring that the electrodes of the magnetic device are clean and tidy.

[0042] In addition, the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 attached to the side magnetic leakage surface 4 during the normal operation of the magnetic device can offset the influence of the external magnetic field, thereby reducing the magnetic leakage of the magnetic device and improving the performance of the magnetic device.

[0043] In addition, during the normal assembly of the magnetic device, the bottom electrode portion 10 serving as the external electrode pin only needs to be bent once to be attached to the bottom welding surface 6, thus avoiding the adverse phenomenon of structural arching that occurs when the electrode is led out at the bottom of the device and bent once and then bent a second time to the side in the related art.

[0044] In one embodiment, arc chamfers are provided at the connection between the coil electrode portion 8 and the side electrode portion 9, and at the connection between the side electrode portion 9 and the bottom electrode portion 10, so as to ensure the smoothness of the overall structure of the metal body 7, making the coil electrode portion 8, the side electrode portion 9, and the bottom electrode portion 10 fit more closely with the magnet 2.

[0045] On the other hand, a functional groove 12 can also be provided on the bottom welding surface 6, and the bottom electrode portion 10 is connected to the functional groove 12, that is, the bottom electrode portion 10 is accommodated in the functional groove 12, which can improve the stability of the connection between the magnetic device and the external device through the bottom electrode portion 10 and also ensure the reliability of the electrical connection therebetween.

[0046] In one embodiment, the magnetic device has an adsorption protection layer 11, and the processing station of the magnetic device during the assembly process can be transferred through the adsorption protection layer 11. Specifically, the adsorption protection layer 11 is provided at one end of the magnet 2 facing away from the bottom welding surface 6, that is, the adsorption protection layer 11 can be regarded as connected to the upper top surface of the magnet 2. Among them, the adsorption protection layer 11 covers the installation gap 3 and is connected to each magnet 2. Specifically, the adsorption protection layer 11 is an integral plane, thus ensuring the flatness of the magnetic device and also facilitating the risk of dropping parts during the vacuum adsorption in the production and assembly process of the magnetic device.

[0047] It should be noted that the coil electrode portion 8 is attached to the front working surface 5, the side electrode portion 9 is attached to the side magnetic leakage surface 4, the bottom electrode portion 10 is attached to the bottom welding surface 6, and the coil electrode portion 8, the side electrode portion 9, and the bottom electrode portion 10 are all arranged in a plane. Among them, the area ratio range of the side electrode portion 9 covering the side magnetic leakage surface 4 includes 20%-98%. Therefore, to require the coverage area of the side electrode portion 9 on the side magnetic leakage surface 4, during the operation of the magnetic device, the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 is used to offset the influence of the external magnetic field, so as to ensure the effect of reducing the magnetic leakage of the magnetic device by the side electrode portion 9.

[0048] In one embodiment, in order to use the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 to offset the influence of the external magnetic field during the operation of the magnetic device, the area ratio of the side electrode portion 9 covering the side magnetic leakage surface 4 is 30%.

[0049] In one embodiment, in order to use the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 to offset the influence of the external magnetic field during the operation of the magnetic device, the area ratio of the side electrode portion 9 covering the side magnetic leakage surface 4 is 40%.

[0050] In one embodiment, in order to use the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 to offset the influence of the external magnetic field during the operation of the magnetic device, the area ratio range of the side electrode portion 9 covering the side magnetic leakage surface 4 can include 50%-98%.

[0051] In one embodiment, in order to use the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 to offset the influence of the external magnetic field during the operation of the magnetic device, the area ratio range of the side electrode portion 9 covering the side magnetic leakage surface 4 can include 60%-98%.

[0052] In one embodiment, in order to use the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 to offset the influence of the external magnetic field during the operation of the magnetic device, the area ratio range of the side electrode portion 9 covering the side magnetic leakage surface 4 can include 70%-98%.

[0053] In one embodiment, in order to use the auxiliary magnetic field formed by the eddy current generated by the side electrode portion 9 to offset the influence of the external magnetic field during the operation of the magnetic device, the area ratio range of the side electrode portion 9 covering the side magnetic leakage surface 4 can include 80%-98%.

[0054] For the magnetic device of the present application, the bottom electrode portion 10 extends along the first direction on the bottom welding surface 6, the side electrode portion 9 extends along the third direction on the side magnetic leakage surface 4, and the metal bodies 7 on each magnet 2 are symmetrically arranged in the second direction. Among them, the metal body 7 may further include a heat insulation portion 13, the heat insulation portion 13 is attached to the side magnetic leakage surface 4 and is respectively connected to the bottom electrode portion 10 and the side electrode portion 9, and the length of the heat insulation portion 13 in the second direction is much smaller than the length of the side electrode portion 9 in the second direction. Based on this structural design, in an application scenario where a bottom electrode portion 10 is welded and fixed to an external device, the heat conduction of the metal body 7 can be blocked, the heat diffusion efficiency of the side electrode portion 9 can be reduced, and thus the structures of the magnetic device can be protected and the reliability of the magnetic device can be improved.

[0055] In one embodiment, it is set that the length of the coil electrode portion 8 in the first direction is G, and the length of the magnet 2 in the first direction is F. Then, the length of the coil electrode portion 8 in the first direction ≤ 0.8 times the length of the magnet 2 in the first direction, that is, G ≤ 0.8F. Thus, the leading-out position of the coil electrode portion 8 on the front working surface 5 is required to refine the structure of the metal body 7.

[0056] In one embodiment, it is set that the length of the side electrode portion 9 in the second direction is E, and the length of the magnet 2 in the second direction is A. Then, the length of the side electrode portion 9 in the second direction < 0.5 times the length of the magnet 2 in the second direction, that is, E < 0.5A. Thus, the extended area of the side electrode portion 9 on the side magnetic leakage surface 4 is required to ensure its effect of reducing the magnetic leakage of the magnetic device.

[0057] In one embodiment, on each magnet 2, there is an installation spacing between adjacent side electrode portions 9. It is set that the length of the installation spacing in the second direction is B. Then, the length of the installation spacing in the second direction ≥ 0.1 times the length of the magnet 2 in the second direction, that is, B ≥ 0.1A. Thus, the position where the side electrode portions 9 are symmetrically arranged in the second direction is required, and the extended area of the side electrode portions 9 on the side magnetic leakage surface 4 is required to ensure its effect of reducing the magnetic leakage of the magnetic device.

[0058] In one embodiment, it is set that the length of the coil electrode portion 8 and / or the side electrode portion 9 in the third direction is D, and the length of the magnet 2 in the third direction is C. Then, the length of the coil electrode portion 8 and / or the side electrode portion 9 in the third direction < 0.8 times the length of the magnet 2 in the third direction, that is, D < 0.8C. Thus, the extended area of the coil electrode portion 8 on the front working surface 5 and / or the extended area of the side electrode portion 9 on the side magnetic leakage surface 4 are required to refine the structure of the metal body 7, reduce the magnetic leakage of the magnetic device, and thus improve the performance of the magnetic device.

[0059] The above has introduced the present application in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A magnetic device, characterized in that: include: A support body, wherein the axis of the support body is parallel to the first direction; A magnet connected to the support body and forming a closed magnetic circuit inside the magnet, wherein there is an installation gap between the magnets, and the magnet has a side magnetic leakage surface away from the installation gap and perpendicular to the first direction, a front end working surface connected to the side magnetic leakage surface, and a bottom welding surface respectively perpendicular to the front end working surface and the side magnetic leakage surface; A metal body is connected to each of the magnets, the metal body partially covers the front end working surface, the side magnetic leakage surface and the bottom welding surface, and the metal body is arranged in a plane on the front end working surface, the side magnetic leakage surface and the bottom welding surface. The metal body on the front end working surface is connected to the winding coil joint in the magnet, and the metal body on the bottom welding surface serves as an external electrode pin.

2. The magnetic device according to claim 1, characterized in that The metal body includes a coil electrode portion, a side electrode portion and a bottom electrode portion which are integrally connected, the coil electrode portion being attached to the front end working surface, the side electrode portion being attached to the side magnetic leakage surface and being perpendicular to the coil electrode portion, and the bottom electrode portion being attached to the bottom welding surface and being perpendicular to the side magnetic leakage surface.

3. The magnetic device according to claim 2, characterized in that The connection between the coil electrode portion and the side electrode portion, and the connection between the side electrode portion and the bottom electrode portion are both provided with arc chamfers.

4. The magnetic device according to claim 1, characterized in that It also includes an adsorption protection layer, which is arranged at one end of the magnet away from the bottom welding surface, and the adsorption protection layer covers the installation gap and connects each of the magnets.

5. The magnetic device according to claim 2, characterized in that: The area ratio of the side electrode portion covering the side magnetic leakage surface ranges from 20% to 98%.

6. The magnetic device according to claim 2, characterized in that: The bottom electrode portion extends along the first direction on the bottom welding surface, the side electrode portion extends along the third direction on the side leakage magnetic surface, and the metal bodies on each of the magnets are symmetrically arranged in the second direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

7. The magnetic device according to claim 6, characterized in that The length of the coil electrode portion in the first direction is ≤ 0.8 times the length of the magnet in the first direction.

8. The magnetic device according to claim 6, characterized in that The length of the side electrode portion in the second direction is less than 0.5 times the length of the magnet in the second direction.

9. The magnetic device according to claim 6, characterized in that: On each of the magnets, adjacent side electrode portions have an installation spacing, and the length of the installation spacing in the second direction is ≥ 0.1 times the length of the magnet in the second direction.

10. The magnetic device according to claim 6, characterized in that The length of the coil electrode portion and / or the side electrode portion in the third direction is less than 0.8 times the length of the magnet in the third direction.

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