JPH0230828Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a chip-type aluminum electrolytic capacitor.

[Technical background of the invention and its problems] Advances in electronic circuits and systems in recent years have resulted in the ability to maximize capacity per unit volume by minimizing external terminals, and to have an external shape that can be automatically mounted on a circuit board. There has been a demand for the development of chip-type capacitors. Tantalum solid electrolytic capacitors and ceramic capacitors have conventionally been put into practical use as capacitors with the above-mentioned characteristics, but this does not apply to capacitors such as aluminum electrolytic capacitors in which a paste-like driving electrolyte is soaked into the capacitor element. Because the drive electrolyte adheres to the surface of the capacitor element, it is extremely difficult to mold it with synthetic resin, and the high heat of 150 to 200°C is directly applied to the capacitor element during molding, which can cause deterioration of the dielectric oxide film. Since the exterior resin is permeable, there is a transmission loss of the driving electrolyte, and the electrical characteristics of the capacitor become unstable. Recently, as in Japanese Utility Model Application Publication No. 56-12341, a capacitor element is housed in an insulating cylinder, and a terminal cap is fitted into the openings at both ends of the insulating cylinder via an elastic member, and a part of the terminal cap is Chip-type aluminum electrolytic capacitors have also been proposed, but the capacitor assembly process is complicated, time-consuming, and costly, and there are problems with hermeticity, resulting in long-term use and automatic mounting on circuit boards using solder reflow. There are drawbacks such as leakage of the driving electrolyte due to the high heat applied during this process.

[Purpose of the invention] The present invention was made in view of the above-mentioned circumstances.The main body of an aluminum electrolytic capacitor with opposite terminal wires is housed in a square cylindrical insulating outer box with an opening on one side, and the terminal wires are bent and the tip is By locating the flat portion of the capacitor on the bottom surface of the insulating outer box, the present invention aims to provide a small and inexpensive chip-type aluminum electrolytic capacitor for reflow soldering.

[Summary of the invention] The chip-type aluminum electrolytic capacitor of this invention is a square cylindrical insulating outer box with an opening on one side that houses the capacitor body. The flat end of the terminal wire is located on the bottom of the insulating outer box.

[Embodiments of the invention] Examples of the invention will be described below with reference to the drawings. That is, as shown in Fig. 1, a square cylindrical insulating outer box with an open side and an aluminum electrolytic capacitor body 1 with terminal wires connected to both ends is sealed in a cylindrical case made of aluminum or plastic and has terminal wires connected to both ends. The capacitor main body 1 is accommodated from the opening side surface 3 of the capacitor 2. Then the second
As shown in FIGS. 3 and 3, the terminal wires 4 and 5 led out on both sides are bent along side grooves 6 provided on the bottom of the case and the other side of the insulating outer box 2, respectively. The flat portions 7 at the ends of the terminal wires 4 and 5 are positioned on the bottom surface. The capacitor main body 1 may have a normal structure, and the terminal wires 4 and 5 are round solder-plated copper wires, and the bottom portion thereof is press-molded to form a flat portion 7. The flat portion 7 is for improving solder adhesion. The insulating outer box 2 serves not only to carry the capacitor body 1 but also to improve the sitting stability when the chip-shaped aluminum electrolytic capacitor is mounted on a printed circuit board.It is made of heat-resistant resin such as polyethylene, polysulfone, polycarbonate,
It is made of polyimide, polyamide, polyphenylene oxide, etc. Furthermore, as shown in FIGS. 2 and 3, this insulating outer box 2 is provided with a side wall 8 on the other side of the insulating outer box 2, and the side wall 8 is provided with the side groove 6 in the center thereof.

[Effect of the invention] The present invention accommodates the capacitor body from the opening side of the insulating outer box that houses the terminal wire opposite type aluminum electrolytic capacitor body, and connects the terminal wires led out to both sides to the bottom of the case and the other side of the insulating outer box. By positioning the flat part of the terminal wire tip on the bottom of the insulating outer box, which is folded along the side grooves on the side,
Since the insulating outer box can be made thin, the overall size can be made smaller, and a normal aluminum electrolytic capacitor with opposite terminal wires can be used as is, and no special processing is required, so it can be manufactured at low cost. Another object of the present invention is to provide a small and inexpensive chip-type aluminum electrolytic capacitor, which has a simple and simple manufacturing process, has a rectangular chip base, makes positioning easy and extremely convenient, and is sufficiently practical for reflow soldering. Can be done.

[Brief explanation of the drawing]

The drawings are all related to one embodiment of the present invention; Fig. 1 is a sectional view to explain how the capacitor body is housed in an insulating outer box, and Fig. 2 is a front sectional view showing a chip-type aluminum electrolytic capacitor. , 3rd
The figure is a side view thereof. 1... Aluminum electrolytic capacitor body, 2...
...Insulating outer box, 3... Opening side surface, 4, 5... Terminal wire, 6... Side groove, 7... Flat part, 8... Side wall.

Claims (1)

[Scope of utility model registration request] A terminal wire opposite type aluminum electrolytic capacitor body sealed in a cylindrical case and having terminal wires connected to both ends, a square cylindrical insulating outer box with one side open that accommodates the capacitor body, and the other parts of the insulating outer box. It comprises a side wall formed on a side wall, a side groove provided in the center of the side wall, and a flat part provided at the tip of the terminal wire, and the capacitor main body is accommodated from the opening side of the insulating outer box, and the capacitor body is accommodated on both sides. A chip-type aluminum electrolytic capacitor, characterized in that terminal wires led out from the case are bent along the bottom of the case and along the side grooves, and the flat portion is positioned on the bottom of the insulating outer box.