Magnetic element with shielding

Abstract

A magnetic element with a shielding function comprises a magnetic element which comprises a body and a plurality of pin parts; and the conductive paint layer is arranged on the surface of the magnetic element, and the conductive paint layer is insulated from each pin part. The conductive paint layer covers the outer surface of the magnetic element to serve as a shield, so that the shield can completely cover the outer surface of the magnetic element without leaving a gap, and compared with a shell shielding mode in the prior art, the magnetic element is easier to manufacture.

Description

Technical Field

[0001] The present invention relates to a magnetic component, particularly a shielded magnetic component with a conductive paint layer on its outer surface. Background Art

[0002] In the era of advanced technology, with various electronic devices pursuing miniaturization and extreme circuit board power density, the spacing between electronic components on the circuit board is continuously reduced. Many components operate based on the principle of magnetic fields, such as magnetic components like inductors and transformers. Such magnetic components will release magnetic fields around the components (i.e., electromagnetic interference, Electromagnetic Interference), which will affect the working state of other components at close range. In applications requiring high stability (such as automotive electronics), the impact of electromagnetic interference must be highly regarded.

[0003] Therefore, there has emerged an inductor with shielding. For example, in the patent with the Taiwan, China publication number TWI734771, a housing is added outside the inductor body as shielding. However, due to the material characteristics of the molded inductor itself, the outer dimensions after die casting are likely to have some tolerances. At this time, if it is to be combined with a pre-made housing, voids are likely to occur and it is impossible to fit tightly; and if excessive pressure is applied to the housing during combination to clamp the inductor body, it may also damage the inductor body; it is also difficult to process the housing to a complex shape that can completely cover the inductor body, and voids will be left in the corners, which is not convenient for bending processing. Therefore, there is room for further improvement in the tightness and coverage between the shielding and the inductor body. Summary of the Invention

[0004] The main object of the present invention is to provide a shielded magnetic component, with a conductive paint layer added to the outer surface of the magnetic component as a complete and tightly fitting shield.

[0005] To achieve the above object, the shielded magnetic component of the present invention includes a magnetic component, which includes a body and a plurality of connecting feet; and a conductive paint layer, which is provided on the surface of the magnetic component, and the conductive paint layer is in an insulated state from each connecting foot. The conductive paint layer can be formed by spraying a metal conductive paint, such as a metal conductive paint containing silver particles, copper particles, or silver-plated copper particles.

[0006] The conductive paint layer on the outside of the magnetic component can form a complete and seamless shield, minimizing the possibility of magnetic field leakage; and the shielding effect can be increased by increasing the thickness of the conductive paint layer to meet the requirements of various different occasions.

[0007] If the surface of the magnetic component is not suitable for direct contact with the conductive conductive paint layer, an insulating coating can be further provided between the body and the conductive paint layer. If a grounding end point is provided on the surface of the magnetic component, the insulating coating should be avoided from covering the grounding end point.

[0008] Since the shield must be grounded, if there is no grounding terminal on the surface of the magnetic component, at least one grounding piece can be further provided on the body, and the grounding piece is electrically connected to the conductive paint layer. Since the conductive paint layer can completely cover the magnetic component, the grounding piece can be provided on the surface closest to the grounding point, and the grounding piece does not need to extend downward all the way from the top surface like the shield in the prior art. If an insulating coating and a grounding piece need to be provided at the same time, the insulating coating can be provided first and then the grounding piece, because the grounding piece does not need to be conductive with the body. It is also possible to provide the grounding piece first, then shield the grounding piece and then provide the insulating coating, and then remove the shielding of the grounding piece after the insulating coating is provided.

[0009] If it is necessary to prevent the oxidation of the conductive paint layer, a protective paint layer can be further provided outside the conductive paint layer. If necessary, the grounding piece or the original grounding terminal of the magnetic component can be shielded during the spraying of the protective paint layer to prevent the protective paint layer from covering the grounding piece or the original grounding terminal of the magnetic component.

[0010] It is also possible to make the protective paint layer have openings at at least one predetermined position. For example, before spraying the protective paint layer, the predetermined position of the conductive paint layer is shielded, and then the shielding of the conductive paint layer is removed after the protective paint layer is sprayed, so that a grounding electrode can be made on the exposed conductive paint layer, and at least one grounding electrode is provided at the position corresponding to the opening on the conductive paint layer.

[0011] In order to clearly and fully disclose the present invention, the accompanying drawings of preferred embodiments are listed to illustrate its implementation manners in detail as follows. Brief Description of the Drawings

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0013] Figure 1 Is a perspective view of Embodiment (1) of the present invention; Figure 2 Is a longitudinal sectional view (1) of Embodiment (1) of the present invention; Figure 3 Is a longitudinal sectional view (2) of Embodiment (1) of the present invention; Figure 4 Is a perspective view of Embodiment (2) of the present invention; Figure 5 Is a longitudinal sectional view of Embodiment (2) of the present invention.

[0014] Description of the Reference Numerals 1. Magnetic component; 11. Connecting foot; 12. Grounding piece; 13. Body; 2. Insulating coating; 3. Conductive paint layer; 31. Ground electrode; 4. Protective paint layer. Detailed implementation manner

[0015] Please refer to Figures 1 to 3 , which discloses the drawings of the embodiments of the present invention. From the above drawings, an embodiment (I) of the magnetic element with shielding of the present invention is illustrated. It includes a magnetic element 1, which includes a body 13 and a plurality of connecting feet 11; and a conductive paint layer 3, which is disposed on the surface of the magnetic element 1. The conductive paint layer 3 is in an insulating state with respect to each connecting foot 11. Figure 1 It can be seen from [the reference] that in embodiment (I), when spraying the conductive paint layer 3, each connecting foot 11 is shielded and does not come into contact with the conductive paint layer 3. Therefore, the conductive paint layer 3 is in an insulating state with respect to each connecting foot 11.

[0016] Embodiment (I) further has an insulating coating 2 between the body 13 and the conductive paint layer 3; embodiment (I) further has at least one grounding piece 12 (two grounding pieces 12 in this embodiment) disposed on the body 13, and the grounding piece 12 is electrically connected to the conductive paint layer 3; embodiment (I) further has a protective paint layer 4 outside the conductive paint layer 3. In embodiment (I), when spraying the insulating coating 2 and the protective paint layer 4, each connecting foot 11 is also shielded. Therefore, there is a gap between the insulating coating 2, the protective paint layer 4 and each connecting foot 11.

[0017] The conductive paint layer 3 outside the magnetic element 1 can form a complete and seamless shield on the outer surface of the body 13, unlike the existing shielding casings that are prone to leaving gaps (such as corners) during processing. In embodiment (I), the body 13 is a cuboid, and the conductive paint layer 3 can be sprayed on all six sides of the body 13, minimizing the possibility of magnetic field leakage. Moreover, the spraying method is easy to cover the outer surface of various complex and undulating magnetic elements 1. If a mechanically processed casing is used to cover the outer surface of complex and undulating magnetic elements 1, the processing cost will increase significantly. The present invention can increase the shielding effect by increasing the thickness of the conductive paint layer 3 to meet the requirements of various different occasions. When the thickness of a mechanically processed casing needs to be increased, there will be processing problems such as being difficult to bend.

[0018] In embodiment (I), in order to correspond to the body 13 of the magnetic element 1 that is not suitable for direct contact with the conductive conductive paint layer 3, there is further an insulating coating 2 between the body 13 and the conductive paint layer 3. If the surface of the magnetic element 1 is already provided with a grounding end point (not drawn), the insulating coating 2 should be avoided from covering the grounding end point (not drawn).

[0019] Since the shield must be grounded, in the first embodiment, in order to correspond to the magnetic component 1 whose surface is not provided with a grounding end point (not drawn), at least one grounding piece 12 is further provided on the body 13, and the grounding piece 12 is electrically connected to the conductive paint layer 3. Since the conductive paint layer 3 can completely cover the magnetic component 1, the grounding piece 12 can be provided on the surface closest to the ground point, and the grounding piece 12 does not need to extend downward all the way from the top surface like the shield in the prior art. If it is necessary to set the insulating coating 2 and the grounding piece 12 at the same time, the insulating coating 2 can be set first and then the grounding piece 12, because the grounding piece 12 does not need to be conductive with the body. It is also possible to set the grounding piece 12 first, then shield the grounding piece 12 and then set the insulating coating 2, and then remove the shield of the grounding piece 12 after setting the insulating coating 2.

[0020] In the first embodiment, in order to prevent the oxidation of the conductive paint layer 3, a protective paint layer 4 is further provided outside the conductive paint layer 3. If necessary, when spraying the protective paint layer 4, the grounding piece 12 or the original grounding end point (not drawn) of the magnetic component 1 can be shielded to prevent the protective paint layer 4 from covering the grounding piece 12 or the original grounding end point (not drawn) of the magnetic component 1.

[0021] The present invention can also make the protective paint layer 4 have openings at at least one predetermined position. Figure 4 and Figure 5 It can be seen that in the second embodiment of the present invention, before spraying the protective paint layer 4, the predetermined position of the conductive paint layer 3 is shielded (in the second embodiment, both opposite sides are shielded). After spraying the protective paint layer 4, the shield of the conductive paint layer 3 is removed, and the protective paint layer 4 will leave openings and expose a part of the conductive paint layer 3, so that a grounding electrode 31 can be made on the exposed conductive paint layer 3, and at least one grounding electrode 31 is provided at the position corresponding to the opening of the conductive paint layer 3. The grounding electrode 31 can be made by electroplating, and after the grounding electrode 31 is made, the shield of each connecting foot 11 is removed, and each connecting foot 11 will not be affected during the electroplating process.

[0022] The above is only the preferred embodiment of the present invention and cannot be used to limit the scope of implementation of the present invention. Any obvious changes and modifications that can be made by those skilled in the art should be regarded as not departing from the essence of the present invention.

Claims

1. A magnetic component with shielding, characterized in that, Comprising: A magnetic component, which includes a body and a plurality of connecting feet; and A conductive paint layer, which is provided on the surface of the magnetic component, and the conductive paint layer is in an insulated state with respect to each connecting foot.

2. The magnetic component with shielding as claimed in claim 1, wherein There is an insulating coating between the body and the conductive paint layer.

3. The magnetic component with shielding as claimed in claim 1, wherein, At least one grounding tab is provided on the body, and the grounding tab is electrically connected to the conductive paint layer.

4. The magnetic component with shielding as claimed in claim 3, wherein, There is a protective paint layer on the outer side of the conductive paint layer.

5. The magnetic component with shielding as claimed in claim 4, wherein The protective paint layer has openings at at least one predetermined position, and at least one grounding electrode is provided on the conductive paint layer at a position corresponding to the opening.

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