Magnetic components that fasten the shield

Abstract

A shielded magnetic component comprises a magnetic component (1) including a body and a plurality of pin portions (11), and a conductive coating (3) disposed on the surface of the magnetic component (1), wherein the conductive coating (3) is insulated from each of the pin portions (11). In the present invention, the conductive coating (3) covers the outer surface of the magnetic component (1) as a shield, so that the shield completely surrounds the outer surface of the magnetic component (1) without leaving any gaps. A shielded magnetic component according to the present invention offers manufacturing advantages over the prior art in which a housing must be provided to function as a shield.

Description

Technical Field

[0001] The present invention relates to magnetic components, particularly magnetic components provided with a conductive coating (conductive film, conductive coating) on their outer surfaces.

Background Art

[0002] In this technical field, there is a tendency towards miniaturization of various electronic devices, maximization of power density on circuit boards, and reduction of the spacing between a plurality of electronic components on circuit boards. Many of these components, including magnetic components such as inductors and transformers, operate based on magnetic principles. Such magnetic components can emit a magnetic field that generates an electromagnetic interface that can affect the functions of nearby components. In applications that require high stability, such as automotive electronics, it is important to carefully manage the effects of the electromagnetic interface.

[0003] From the perspective of the above matters, inductors with shields have been developed. For example, the Taiwan Patent of Patent Document 1 discloses an inductor including a housing that acts as a shield on an inductor body. However, due to the material characteristics of the molded inductor itself, the outer dimensions of the molded inductor tend to have a small tolerance. In this case, when the inductor body is combined with a pre-formed housing, a gap may occur between them and close contact cannot be achieved. Furthermore, if excessive pressure is applied to clamp the housing and the inductor body during combination, the inductor body will be damaged. Moreover, it is a difficult challenge to process the housing into a complex shape that fits perfectly on the inductor body. As shown in the representative drawing (Figure 4) of the prior patent described above, in the prior art, a gap usually remains at the corner in order to simplify the bending process. Therefore, there is a need for further improvement in terms of the coverage rate and the connection where the shield fits the inductor body.

[0004] From this perspective, inventors with many years of research and practical experience in related fields have designed magnetic components equipped with shields to overcome the aforementioned shortcomings of the prior art. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] TWI734771B [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The main objective of the present invention is to provide a magnetic component with improved shielding. [Means for solving the problem]

[0007] For this purpose, a shielded magnetic component according to the present invention comprises a magnetic component including a body and a plurality of pin portions, and a conductive coating disposed on the surface of the magnetic component, wherein the conductive coating is insulated from each of the pin portions. The conductive coating may be formed by spraying and coating a metal-based conductive material, such as a metal-based conductive material containing silver particles, copper particles, or silver-plated copper particles. The conductive coating disposed on the outer surface of the magnetic component functions as a perfect, snug-fitting shield.

[0008] A conductive coating on the outer surface of a magnetic component can form a completely seamless shield, thereby minimizing the possibility of magnetic field leakage. Furthermore, the shielding effect can be improved by increasing the thickness of the conductive coating to meet the requirements of various applications.

[0009] The magnetic component includes at least one inductor and a transformer, which are enclosed by the main body and electrically connected to multiple pin portions.

[0010] If the surface of a magnetic component is not suitable for direct contact with an electrically conductive coating, an insulating coating (insulating film) may be placed between the component and the conductive coating. Furthermore, if a grounding terminal is present on the surface of the magnetic component, it is necessary to ensure that the insulating coating does not cover the grounding terminal.

[0011] Since a shield must be installed, if the surface of the magnetic component does not have a grounding terminal, a grounding projection may be provided on the body. The grounding projection is electrically connected to the conductive coating. Since the conductive coating can completely surround the magnetic component, the grounding projection can be positioned precisely on the surface closest to the installation location. Unlike the prior art, the grounding projection does not need to extend from the top surface to the edge. When both an insulating coating and a grounding projection are installed, the insulating coating may be installed first, followed by the grounding projection, since the grounding projection does not have the function of electrically conducting with the body. Alternatively, the grounding projection may be installed first, then covered with a mask, and then the insulating coating may be applied. Once the insulating coating is applied, the mask over the grounding projection may be removed.

[0012] To prevent oxidation of the conductive coating, a protective coating (protective film) may be applied over the conductive coating. If necessary, to ensure that the protective coating does not cover the grounding protrusion or the original grounding terminal of the magnetic component, the grounding protrusion or the original grounding terminal of the magnetic component may be masked before the application of the protective coating.

[0013] The protective coating may have at least one opening at a predetermined location. For example, a predetermined location on the conductive coating is masked before the protective coating is applied. After application, the mask is removed, leaving an opening in the protective coating. The opening exposes a portion of the conductive coating where a ground electrode is formed. Thus, the conductive coating may have at least one ground electrode positioned at the location corresponding to the opening.

[0014] The method of the present invention may be further defined by at least one feature described in relation to the magnetic component of the present invention equipped with a shield.

[0015] To clearly and completely disclose the present invention, drawings of preferred embodiments are provided, and their implementation is described in detail below. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view of embodiment (1) according to the present invention. [Figure 2] This is a cross-sectional view (1) of an embodiment (1) according to the present invention. [Figure 3] This is a cross-sectional view (2) of embodiment (1) according to the present invention. [Figure 4] This is a perspective view of embodiment (2) according to the present invention. [Figure 5] This is a cross-sectional view of embodiment (2) according to the present invention. [Modes for carrying out the invention]

[0017] Figures 1-3 are drawings illustrating a detailed embodiment of the present invention. Referring to Figures 1-3, a shielded magnetic component according to Embodiment (1) of the present invention includes a magnetic component 1 comprising a body 13 and a plurality of pin portions 11, and a conductive coating 3 disposed on the surface of the magnetic component 1. The conductive coating 3 is insulated from each of the pin portions 11. In Embodiment (1), as shown in Figure 1, when spraying to form the conductive coating 3, each of the pin portions 11 is masked, i.e., each of the pin portions 11 is not in contact with the conductive coating 3. Thus, the conductive coating 3 is insulated from each of the pin portions 11.

[0018] The magnetic component 1 includes at least one of an inductor and a transformer, which is surrounded by a body 13 and electrically connected to a plurality of pin portions 11.

[0019] According to Embodiment (1), an insulating coating 2 is provided between the main body 13 and the conductive coating 3. Further, according to Embodiment (1), at least one grounding projection 12 (two grounding projections 12 are shown in the drawing) is arranged on the main body 13. The grounding projection 12 is electrically connected to the conductive coating 3. Further, according to Embodiment (1), a protective coating 4 is provided outside the conductive coating 3. According to Embodiment (1), when spraying to form the insulating coating 2 and the protective coating 4, each of the pin portions 11 is masked, and there is a gap between the insulating coating 2, the protective coating 4 and each pin portion 11.

[0020] The conductive coating 3 on the magnetic component 1 can form a completely seamless (seamless) shield on the outer surface of the main body ************** 13. Different from the conventional shield housing that tends to leave gaps (for example, at corners) during the process, the main body 13 in Embodiment (1) is a cuboid, and all six surfaces of the main body 13 can be coated with the conductive coating 3, and the possibility of magnetic field leakage is minimized. Further, the conductive coating 3 applied by spraying can easily adapt to the complex and undulating outer surface of the magnetic component 1. In contrast, using a mechanically processed housing due to the complex and undulating outer surface can significantly increase the processing cost. The shielding effect is enhanced by increasing the thickness of the conductive coating 3 to meet the requirements of various applications. However, increasing the thickness of a mechanically processed housing can pose difficult challenges in the bending process during manufacturing.

[0021] In Embodiment (1), considering that the main body 13 of the magnetic component 1 should not be in direct contact with the conductive coating 3 having electrical conductivity, the insulating coating 2 is inserted between the main body 13 and the conductive coating 3. Further, when a grounding terminal (not shown) is installed on the surface of the magnetic component 1, it is necessary to ensure that the insulating coating 2 does not cover the grounding terminal (not shown).

[0022] It should be noted that there are some parts in the original text that seem to be incomplete (such as "**************" in the middle of the translation of ID=4), which may affect the accuracy of understanding. If possible, please check and provide the complete original text for a more accurate translation.Since the shield must be installed in Embodiment (1), considering that the magnetic component 1 does not have a ground terminal (not shown), a ground protrusion 12 is installed on the main body 13 and is electrically connected to the conductive coating 3. Since the conductive coating 3 can completely surround the magnetic component 1, the ground protrusion 12 can be accurately positioned on the surface closest to the installation position. Different from the prior art, the ground protrusion 12 does not need to extend from the upper surface to the end. When both the insulating coating 2 and the ground protrusion 12 are installed, since the ground protrusion 12 does not have the function of being electrically conductive with the main body, the insulating coating 2 can be installed first, and then the ground protrusion 12 can be installed. Instead, the ground protrusion 12 can be installed first, then masked, and the insulating coating 2 can be applied. Once the insulating coating 2 is applied, the mask on the ground protrusion 12 can be removed.

[0023] In Embodiment (1), in order to prevent oxidation of the conductive coating 3, a protective coating 4 can be applied on the conductive coating 3. If necessary, in order to ensure that the protective coating 4 does not cover the ground protrusion 12 or the first ground terminal (not shown) of the magnetic component 1, the ground protrusion 12 or the first ground terminal (not shown) of the magnetic component 1 can be masked before the application of the protective coating 4.

[0024] The protective coating 4 according to the present invention can include openings at at least one predetermined position, as shown in FIGS. 4 and 5. In Embodiment (2), before the application of the protective coating 4, a predetermined position on the conductive coating 3 is masked (in Embodiment (2), both opposite sides are masked). After application, the mask is removed, and the openings remain in the protective coating 4. The openings expose a part of the conductive coating 3, and a ground electrode 3I is formed there. Therefore, the conductive coating 3 can have at least one ground electrode 3I positioned at a location corresponding to the openings. The ground electrode 3I can be formed using an electroplating method. Further, the mask of the pin portion 11 is removed after the formation of the ground electrode 3I, ensuring that each of the pin portions 11 is not affected by the electroplating method.

[0025] While preferred embodiments have been described for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions are possible without departing from the scope and spirit of the invention. [Explanation of Symbols]

[0026] 1: Magnetic components 11: Pin part 12: Ground protrusion 13: Main unit 2: Insulating coating 3: Conductive coating 31: Ground electrode 4: Protective coating

Claims

1. A magnetic component equipped with a shield, A magnetic component (1) including a main body (13) and multiple pin portions (11), and The magnetic component (1) is provided with a conductive coating (3) arranged on its surface, A magnetic component in which the conductive coating (3) is insulated from each of the pin portions (11).

2. A magnetic component having a shield according to claim 1, further comprising an insulating coating (2) between the main body (13) and the conductive coating (3).

3. A magnetic component with a shield according to claim 1 or 2, further comprising at least one grounding projection (12) on the main body (13), wherein the at least one grounding projection (12) is electrically connected to the conductive coating (3).

4. A magnetic component having a shield according to any one of claims 1 to 3, further comprising a protective coating (4) on the outside of the conductive coating (3).

5. A magnetic component with a shield according to claim 4, wherein the protective coating (4) includes an opening at at least one predetermined location, and at least one ground electrode (31) is installed on the conductive coating (3) at a location corresponding to the opening.

6. The magnetic component with a shield according to claim 5, wherein at least one ground electrode (31) is electroplated.

7. A magnetic component having a shield according to at least one of claims 1 to 6, wherein the conductive coating (3) forms a completely seamless shield.

8. A magnetic component having a shield according to at least one of claims 1 to 7, wherein the conductive coating (3) is formed by spraying and coating a metal-based conductive material.

9. A magnetic component having a shield according to at least one of claims 1 to 8, wherein the conductive coating (3) comprises at least one of silver particles, copper particles, and silver-plated copper particles.

10. A magnetic component with a shield according to at least one of claims 3 to 9, wherein the conductive coating (3) completely surrounds the magnetic component (1), and the grounding projection (12) is positioned on the surface of the magnetic component (1) that is precisely closest to the grounding position.

11. A magnetic component comprising a shield according to at least one of claims 1 to 10, wherein the main body (13) is a rectangular parallelepiped and all six faces of the main body (13) are coated with the conductive coating (3).

12. A magnetic component comprising a shield according to at least one of claims 1 to 11, wherein the magnetic component (1) includes at least one of an inductor and a transformer.

13. A method for manufacturing a magnetic component equipped with a shield, The steps include providing a magnetic component (1) including a main body (13) and a plurality of pin portions (11), and The process includes the step of placing a conductive coating (3) on the surface of the magnetic component (1), The conductive coating (3) is insulated from each of the pin portions (11) in this method.

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