A thin film capacitor

Abstract

The utility model provides a kind of film capacitor, comprising: shell, core, fish eye terminal and filling material;Fish eye terminal includes connecting portion, first shoulder, second shoulder and plug-in part, connecting portion connects the gold spraying surface of core, to make fish eye terminal and core form assembly, shell defines the mounting cavity of top open to install assembly, plug-in part protrudes mounting cavity for with the jack of PCB board is plugged, the inner side wall of mounting cavity opposite with the gold spraying surface of core is equipped with the step groove of top opening, to accommodate connecting portion and first shoulder, step groove can abut the bottom and two side parts of first shoulder, to limit fish eye terminal to move downward and to front and back direction, second shoulder is used to limit the limit depth of plug-in part insertion jack, filling material is used to fill the gap between assembly and the inner wall of mounting cavity.The film capacitor is simple to assemble, and can be connected with the PCB board by the plug-in mode.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically to a thin-film capacitor. Background Technology

[0002] With the development of modern technology, electronic products are constantly evolving towards miniaturization, high integration, and low cost. Existing film capacitors are typically connected to the motherboard via soldering. However, film capacitors are more sensitive to the high temperatures generated during PCB soldering. The high temperatures of wave soldering or reflow soldering are conducted through the electrodes to the film capacitor core, easily causing the film to shrink due to heat, affecting product performance. Furthermore, wave soldering or reflow soldering also increases costs, causes environmental pollution, and consumes more energy. Therefore, it is necessary to improve the connection method between film capacitors and the PCB board. Utility Model Content

[0003] The present invention aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, the objective of this invention is to provide a thin-film capacitor that is simple to assemble and can be connected to a PCB board via a plug-in connection.

[0004] To achieve the above objectives, this utility model proposes a thin-film capacitor, which includes: Housing, core, fisheye terminals, and filler; The fisheye terminal includes a connecting portion, a first shoulder, a second shoulder, and a plug portion. The connecting portion connects to the gold-plated surface of the core, so that the fisheye terminal and the core form an assembly. The housing defines a top-opening mounting cavity for mounting the assembly. The plug portion extends out of the mounting cavity for interlocking with a socket on the PCB board. The inner sidewall of the mounting cavity opposite to the gold-plated surface of the core has a stepped groove with a top opening to accommodate the connecting portion and the first shoulder. The stepped groove can abut against the bottom and sides of the first shoulder to restrict the downward and forward / backward movement of the fisheye terminal. The second shoulder is used to limit the maximum depth to which the plug portion can be inserted into the socket. The filler is used to fill the gap between the assembly and the inner wall of the mounting cavity.

[0005] According to the present invention, a thin-film capacitor is formed by connecting a fisheye terminal to the gold-plated surface of a core to form an assembly. The assembly is then embedded into a housing with stepped grooves to position it. The assembly and the housing are then filled with filler material to fix them together. The first shoulder of the fisheye terminal increases the horizontal contact area between the fisheye terminal and the filler material during filling, thereby improving the pull-out resistance of the fisheye terminal. The fisheye terminal is inserted into the socket of the PCB board, which enables quick connection, reduces soldering steps, improves efficiency, and avoids high-temperature damage to the PCB board and the capacitor.

[0006] In addition, the thin-film capacitor proposed according to the above embodiments of this utility model may also have the following additional technical features: Optionally, the inner wall of the stepped groove is provided with a buckle. When the component is embedded in the mounting cavity, the first shoulder can pass over the buckle and engage in the stepped groove to restrict the fisheye terminal from moving upward.

[0007] Furthermore, the inverted buckle is disposed on the inner wall opposite to the gold-plated surface of the core.

[0008] Optionally, the fisheye terminal includes a first protrusion that abuts against the inner wall of the stepped groove opposite to the gold-plated surface to restrict the fisheye terminal from moving in the left-right direction.

[0009] Furthermore, the first protrusion is hemispherical.

[0010] Optionally, the insertion part has a hollowed-out area, and the inner walls on both sides of the hollowed-out area have second protrusions facing each other.

[0011] Furthermore, the second protrusion is arc-shaped. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a thin-film capacitor according to an embodiment of the present invention; Figure 2 An exploded view of a thin-film capacitor according to an embodiment of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure of the fisheye terminal; Figure 4 An exploded view of a thin-film capacitor according to another embodiment of the present invention; Figure 5 for Figure 4 Schematic diagram of the structure of the fisheye terminal; Explanation of reference numerals in the attached figures: 1. Housing, 11. Mounting cavity, 12. Step groove, 13. Inverted clip, 2. Core, 3. Fisheye terminal, 31. Connecting part, 32. First shoulder, 33. Second shoulder, 34. Insertion part, 35. First protrusion, 36. Hollowed-out part, 37. Second protrusion, 4. Filler. Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0014] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0015] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0016] The following is for reference. Figures 1-5 The implementation of the thin-film capacitor proposed in the embodiments of this utility model will be described in detail.

[0017] The thin-film capacitor according to an embodiment of the present invention includes: a housing 1, a core 2, a fisheye terminal 3, and a filler 4; The fisheye terminal 3 includes a connecting portion 31, a first shoulder 32, a second shoulder 33, and a plug-in portion 34. The connecting portion 31 connects to the gold-plated surface of the core 2 so that the fisheye terminal 3 and the core 2 form an assembly. The housing 1 defines a top-open mounting cavity 11 for mounting the assembly. The plug-in portion 34 extends out of the mounting cavity 11 for interlocking with the socket on the PCB board. The inner sidewall of the mounting cavity 11 opposite to the gold-plated surface of the core 2 is provided with a top-opening stepped groove 12 to accommodate the connecting portion 31 and the first shoulder 32. The stepped groove 12 can abut against the bottom and sides of the first shoulder 32 to restrict the fisheye terminal 3 from moving downward and forward and backward. The second shoulder 33 is used to limit the maximum depth of the plug-in portion 34 inserted into the socket. The filler 4 is used to fill the gap between the assembly and the inner wall of the mounting cavity 11.

[0018] In other words, the fisheye terminal 3 connecting part 31 is welded to the two gold-plated surfaces of the core 2 to form an assembly. The housing 1 has a mounting cavity 11 with a top opening, and the mounting cavity 11 has a stepped groove 12 with a larger top and a smaller bottom on the inner wall of the opposite gold-plated surfaces. The assembly is inserted into the mounting cavity 11 from the top opening. The first shoulder 32 and the connecting part 31 of the fisheye terminal 3 are both located in the mounting cavity 11, and the second shoulder 33 and the insertion part 34 of the fisheye terminal 3 extend out of the mounting cavity 11 from the opening. The side and top of the core 2 facing the gold-plated surface of component 12 are open, facilitating direct insertion of the component into the mounting cavity 11. After insertion, the front and rear ends of the first shoulder 32 engage with the front and rear walls of the stepped groove 12, preventing the fisheye terminal 3 from moving forward or backward. Simultaneously, the bottom end of the first shoulder 32 engages with the stepped surface of the stepped groove 12, preventing the fisheye terminal 3 from moving downward. This allows the component to be positioned relative to the housing 1. The filling material 4 then secures the component to the housing 1. The overall assembly process is simple and reliable, greatly improving efficiency. Furthermore, the insertion part 34 can directly mate with the sockets on the PCB board, avoiding damage to the capacitor and PCB board from soldering heat.

[0019] One or more fisheye terminals 3 can be soldered onto one gold-plated surface of the core 2. One fisheye terminal 3 can be provided with one or more plug-in parts 34. The specific number can be set according to the number of plug holes on the PCB board. The connecting part 31 of the fisheye terminal 3 can be in the shape of a slender rod to facilitate full soldering with the gold-plated surface of the core 2. The first shoulder 32 extends forward and / or backward from the top of the connecting part 31. Adjacent fisheye terminals 3 can be connected through the first shoulder 32 or abut against each other through the first shoulder 32. The filler 4 can be made of existing materials. The connecting part 31 and the first shoulder 32 can fit against the left or right wall of the stepped groove 12, or they can overlap with the stepped groove 12 in the left and right directions to form a gap.

[0020] Thus, an assembly is formed by connecting the fisheye terminal 3 and the gold-plated surface of the core 2. The assembly is then embedded into the housing 1 with the stepped groove 12 to position it. The assembly and housing 1 are then filled with filler material 4 to fix the assembly and housing 1. The first shoulder 32 of the fisheye terminal 3 is designed to increase the horizontal contact area between the fisheye terminal 3 and the filler material 4 during filling, thereby improving the pull-out resistance of the fisheye terminal 3. The fisheye terminal 3 is inserted into the socket of the PCB board, which can achieve quick connection, reduce the soldering process, improve efficiency, and avoid high temperature damage to the PCB board and capacitor.

[0021] Optionally, a buckle 13 is provided on the inner wall of the stepped groove 12. When the component is inserted into the mounting cavity 11, the first shoulder 32 can pass over the buckle 13 and engage within the stepped groove 12 to restrict the upward movement of the fisheye terminal 3. Understandably, by providing the buckle 13, the fisheye terminal 3 can contact the buckle 13 during the process of the component being inserted into the mounting cavity 11. The buckle 13 or the fisheye terminal 3 can undergo slight elastic deformation, allowing the first shoulder 32 to pass over the buckle 13 and engage within the stepped groove 12. This restricts the upward movement of the fisheye terminal 3 and improves its pull-out resistance. The buckle 13 can be provided on the front and rear walls of the stepped groove 12, and the top of the buckle 13 can be provided as an inclined surface to facilitate the smooth passage of the fisheye terminal 3 over the buckle 13.

[0022] Furthermore, the inverted buckle 13 is disposed on the inner wall opposite to the gold-plated surface of the core 2. Understandably, placing the inverted buckle 13 on the inner wall opposite the gold-plated surface allows it to directly act on the first shoulder 32 area near the connecting portion 31. This area is a key part of the fisheye terminal 3 that experiences force in the vertical direction. This design allows the inverted buckle 13 to more accurately and directly limit the first shoulder 32, avoiding insufficient constraint force on the first shoulder 32 due to misalignment of the inverted buckle 13. Moreover, the placement of the inverted buckle 13 in this position not only simultaneously restricts the upward movement of both fisheye terminals 3, but also provides more space, facilitating the installation of multiple or larger-area inverted buckles 13.

[0023] Optionally, the fisheye terminal 3 includes a first protrusion 35, which abuts against the inner wall of the stepped groove 12 opposite to the gold-plated surface to restrict the fisheye terminal 3 from moving in the left-right direction. Understandably, after the component is inserted into the mounting cavity 11, the first protrusion 35 will naturally abut against the inner wall opposite to the gold-plated surface, forming a rigid constraint in the left-right direction, preventing the fisheye terminal 3 from wobbling in the left-right direction, while ensuring the spacing between the two sets of fisheye terminals 3 on the two gold-plated surfaces of the core 2. During subsequent mating with the PCB board, the insertion part 34 can accurately align with the insertion hole, improving overall assembly efficiency and connection reliability. The first protrusion 35 can be located at the intersection of the connecting part 31 and the first shoulder 32.

[0024] Furthermore, the first protrusion 35 is hemispherical. Understandably, during the process of embedding the component into the mounting cavity 11, the hemispherical surface can form a smooth contact with the inner wall, significantly reducing frictional resistance during insertion and preventing the protrusion from scratching the inner wall of the mounting cavity 11 or being damaged by hard friction, ensuring smooth and unobstructed component assembly. On the other hand, the hemispherical structure has more stable mechanical properties and is less prone to deformation due to vibration or external impact during long-term use, continuously providing lateral positioning. The first protrusion 35 can be formed by stamping.

[0025] Optionally, the connector 34 has a cutout 36, and the inner walls on both sides of the cutout 36 have second protrusions 37 facing each other. Understandably, the cutout design of the connector 34 firstly gives the terminal a certain degree of elastic deformation capability. When the connector 34 is inserted into the PCB board socket, the material in the cutout area can slightly shrink, reducing the compressive stress between the connector and the inner wall of the socket during insertion, thereby reducing the insertion force and facilitating quick assembly by the operator. Simultaneously, the second protrusions 37 increase the conductive contact area between the connector 34 and the inner wall of the socket, compensating for the insufficient contact area that may be caused by the cutout design, and ensuring the reliability of the electrical connection. The cutout 36 can be figure-eight shaped.

[0026] Furthermore, the second protrusion 37 is arc-shaped. Understandably, designing the second protrusion 37 as arc-shaped, without sharp edges, can avoid scratching the metal plating on the inner wall of the PCB board's insertion hole, preventing poor contact and ensuring the electrical performance of the PCB board; the arc-shaped structure adapts to the elastic deformation requirements of the hollow design of the insertion part 34, which can slightly shrink with the hollow area to adapt to the insertion hole, and because the arc shape has better mechanical stability, it significantly improves the connection strength and fracture resistance of the insertion part 34, avoiding the insertion part 34 from breaking during vibration or insertion and removal.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0032] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A thin-film capacitor, characterized in that, include: Housing, core, fisheye terminals, and filler; The fisheye terminal includes a connecting portion, a first shoulder, a second shoulder, and a plug portion. The connecting portion connects to the gold-plated surface of the core, so that the fisheye terminal and the core form an assembly. The housing defines a top-opening mounting cavity for mounting the assembly. The plug portion extends out of the mounting cavity for interlocking with a socket on the PCB board. The inner sidewall of the mounting cavity opposite to the gold-plated surface of the core has a stepped groove with a top opening to accommodate the connecting portion and the first shoulder. The stepped groove can abut against the bottom and sides of the first shoulder to restrict the downward and forward / backward movement of the fisheye terminal. The second shoulder is used to limit the maximum depth to which the plug portion can be inserted into the socket. The filler is used to fill the gap between the assembly and the inner wall of the mounting cavity.

2. The thin-film capacitor as claimed in claim 1, characterized in that, The inner wall of the stepped groove is provided with a buckle. When the component is embedded in the mounting cavity, the first shoulder can pass over the buckle and cooperate in the stepped groove to restrict the fisheye terminal from moving upward.

3. The thin-film capacitor as described in claim 2, characterized in that, The inverted buckle is disposed on the inner wall opposite to the gold-plated surface of the core.

4. The thin-film capacitor as claimed in claim 1, characterized in that, The fisheye terminal includes a first protrusion, which abuts against the inner wall of the stepped groove opposite to the gold-plated surface to restrict the fisheye terminal from moving in the left-right direction.

5. The thin-film capacitor as described in claim 4, characterized in that, The first protrusion is hemispherical.

6. The thin-film capacitor as claimed in claim 1, characterized in that, The insertion part has a hollowed-out area, and the inner walls on both sides of the hollowed-out area have second protrusions facing each other.

7. The thin-film capacitor as claimed in claim 6, characterized in that, The second protrusion is arc-shaped.

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