Patent Application
20120019985
1. Field of the Invention
The present invention relates to an electrolytic capacitor; in particular, to an aluminum electrolytic capacitor that can be firmly fastened on the printed circuit board.
2. Description of Related Art
Capacitors are used for storing electric charge, AC filtering, bypass circuit, cutting off or blocking DC voltage, moderating output voltage, and providing oscillation. Different kinds of capacitors have different characteristics. Therefore, the functions and application fields are also different. Because the aluminum electrolytic capacitor has higher static electricity capacity and the manufacturing cost is lower, the device is applicable in various fields, namely communication electronics and electric products such as power supplies, mother boards, surveillance cameras, and audio players.
Of the prior art, when the aluminum electrolytic capacitor is installed on the printed circuit board, the two electric leads of the aluminum electrolytic capacitor are plugged into slotted holes on the printed circuit board. Next, the assembly is sent into a furnace for tin soldering. To prevent the aluminum electrolytic capacitor from being damaged due to external force or dropped from the printed circuit board, the workers need to spot glue between the aluminum electrolytic capacitor and the printed circuit board. Such process has several drawbacks. First, not all aluminum electrolytic capacitors are assured in receiving spot gluing. Second, the glue may peel off after a period of time. Thereby, the electrolytic capacitor cannot be assured to stay firmly on the printed circuit board. In addition, manpower is wasted in performing spot gluing, which increases the manufacturing time and cost.
The object of the present invention is to provide an aluminum electrolytic capacitor with a metal set plate, which can be soldered onto the printed circuit board. The solution assures the aluminum electrolytic capacitor stays firmly on the printed circuit board.
In order to achieve the aforementioned objects, according to an embodiment of the present invention, an aluminum electrolytic capacitor is provided. The aluminum electrolytic capacitor comprises a main body with a base and a plastic insulating film, two electric leads at one side of the base, and a metal set plate at the other side of the base, opposite of the two electric leads. The metal set plate has a connecting portion to the base, and a soldering portion that extend outward from the main body. The plastic insulating film of the main body wraps around the base and the outer edge of the connecting portion. Thereby, the metal set plate is securely connected to the main body.
The present invention has the following advantages. For the aluminum electrolytic capacitor, the metal set plate's soldering portion can be soldered directly onto the printed circuit board. Thereby, the aluminum electrolytic capacitor is secured more firmly on the printed circuit board. When under vibration or any external force, the aluminum electrolytic capacitor is not easily damaged or detached from the printed circuit board. Furthermore, the present invention only need soldering one time, to solder the electric leads and the soldering portion of the metal set plate onto the printed circuit board. No manpower is needed to perform the glue-spotting process. Thereby, the manufacturing process is simplified, and the manufacturing time and cost is reduced.
In order to further the understanding regarding the present invention, the following embodiments are provided along with illustrations to facilitate the disclosure of the present invention.
The aforementioned illustrations and following detailed descriptions are exemplary for the purpose of further explaining the scope of the present invention. Other objectives and advantages related to the present invention will be illustrated in the subsequent descriptions and appended drawings.
The present invention provides an aluminum electrolytic capacitor (EC capacitor, or EC CAP). Reference is made to
The capacitor's main body 10 has a base 11 and a plastic insulating film 12. The base 11 is a long cylindrical body that extends in the horizontal direction. The plastic insulating film 12 is made of insulating material and wraps around the base 11. The round external surface of the plastic insulating film 12 can be printed with the related texts, such as the capacitance rating, specifications, and the type of the aluminum electrolytic capacitor.
Of the main body 10, the two electric leads 20 are located at one end of the base 11 and electrically connected to base 11. The two electric leads 20 have different polarities, and both lengths can be identical or different. To connect electrically, the two electric leads 20 are used to plug into the slotted holes (not shown in the figure) of a printed circuit board.
Of the main body 10, the metal set plate 30 is located at the other end of base 11 opposite of the two electric leads 20. The metal set plate 30 has a connecting portion 31 and a soldering portion 33. Of the main body 10, the connecting portion 31 is located at the face of the other end of base 11 opposite of the two electric leads 20. The connecting portion 31 is flat and has a semi-circular shape, with the upper portion being circular and aligns exactly to the outer edge of base 11. The soldering portion 33 extends outward from the main body 10. The material of the metal set plate 30 is not limited to a specific type. In one preferred embodiment, the metal set plate 30 is made of tinplate.
Of the main body 10, the plastic insulating film 12 wraps around the base 11 and covers the outer edge of the connecting portion 31 of the metal set plate 30 (referring to
When setting the aluminum electrolytic capacitor onto the printed circuit board, the bottom surface of the main body 10 faces the top surface of the printed circuit board. The two electric leads 20 and the soldering portion 33 of the metal set plate 30 are plugged into the respective slots on the printed circuit board. Next, the print circuit board and the aluminum electrolytic capacitor are sent into the tin soldering furnace, where the two electric leads 20 and the soldering portion 33 of the metal set plate 30 are soldered onto the printed circuit board. Thereby, the aluminum electrolytic capacitor is firmly secured.
Reference is made to
In this embodiment, the extension 32 extends horizontally off the bottom edge of the connecting portion 31 and axially away from the main body 10, but not limited to above. The width of the extension 32 is the same as the soldering portion 33, with both widths being smaller than the width of the connecting portion 31, but not limited to above. For design purpose, the extension 32 must be long enough to offset the soldering portion 33 a minimum of 2 mm axially away from the main body 10. The specification is needed to meet the safety requirement.
At the location of the two electric leads 20, the plastic insulating film 12 has a first opening 121. At the location of the extension 32 of the metal set plate 30, the plastic insulating film 12 has a second opening 122. The two electric leads 20 penetrates through the first opening 121, and the extension 32 of the metal set plate 30 penetrates through the second opening 122.
In addition to soldering the two electric leads onto the printed circuit board, the present invention also includes a metal set plate where the soldering portion is soldered onto the printed circuit board. Thereby, the aluminum electrolytic capacitor is secured more firmly. Even under vibration and external forces, the aluminum electrolytic capacitor is not easily damaged or slips off from the printed circuit board.
Furthermore, the present invention only need soldering one time, to solder the electric leads and the soldering portion of the metal set plate onto the printed circuit board. No manpower is needed to perform the glue-spotting process. Thereby, the manufacturing process is simplified, and the manufacturing time and cost is reduced.
The descriptions illustrated supra set forth simply the preferred embodiments of the present invention; however, the characteristics of the present invention are by no means restricted thereto. All changes, alternations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the present invention delineated by the following claims. icm What is claimed is:
