JPH0437110A - Flat type aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To improve the contact areas of an anode lead terminal, a cathode lead terminal and an auxiliary terminal with a printed board, to improve solderability, and to eliminate peeling of a soldered part even if a vibration test is conducted by pressing the anode, cathode lead terminals and the end of the auxiliary terminal to form flat parts, etc. CONSTITUTION:A capacitor element 11 immersed with electrolyte, a flat bottomed cylindrical metal case 12 for containing the element 11, a sealer 13 for sealing the open end of the case 12, an anode lead terminal 14 and a cathode lead terminal 15 led from the element 11 and made of round rods, and a capacitor securing auxiliary terminal 16 secured to the bottom of the case 12 and made of round rods are provided. The terminals 14, 15 and 16 are bent, the ends 14a-16a are disposed on the same flat surfaces as the side and flat surfaces of the case 12, the ends 14a-16a of the terminals 14, 15 and 16 are pressed to be formed with flat surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat aluminum electrolytic capacitor in which a capacitor element is housed in a flat bottomed cylindrical metal case.

2. Description of the Related Art A conventional flat aluminum electrolytic capacitor of this type has a structure as shown in FIG. That is, the capacitor element 1 is housed in a flat bottomed cylindrical metal case 2 made of aluminum, and an elastic sealing member 3 is press-fitted into the open end of the metal case 2 to maintain airtightness, and the metal By curling the open end of the case 2, the elastic sealing body 3 and the capacitor element 1 are attached to the metal case 2.
It was fixed inside. 4 and 4a are an anode lead terminal and a cathode lead terminal made of round bar lead wires.

Further, in order to fix the flat aluminum electrolytic capacitor to a printed circuit board, an auxiliary terminal 5 made of a round bar lead wire is welded to the bottom of the metal case 2, and the auxiliary terminal 5 is bent and its tip The portion 5a was positioned on the same plane as the flat portion 21L on the side surface of the metal case 2, and was installed on the printed circuit board.

Problems to be Solved by the Invention However, in the flat aluminum electrolytic capacitor with the conventional configuration described above, the anode lead terminal 4, the cathode lead terminal 41L, and the auxiliary terminal 6 are round bars. When surface mounted on a printed circuit board and soldered, the printed circuit board and the anode lead terminal made of a round bar 4. Cathode lead terminal 4! The contact area with L and auxiliary terminal 5 is very small, and as a result,
Even if soldering is performed, sufficient strength of the soldered joint cannot be ensured, so there is a problem in that when a vibration test is performed, an accident occurs in which the soldered part peels off.

The present invention solves these conventional problems,
The contact area between the anode lead terminal, cathode lead terminal, and auxiliary terminal and the printed circuit board has been improved to improve soldering properties, and the flat aluminum electrolytic design does not cause peeling of soldering parts even when subjected to vibration tests. The purpose is to provide capacitors.

Means for Solving the Problems In order to achieve the above object, the flat aluminum electrolytic capacitor of the present invention comprises a capacitor element formed by winding an anode foil and a cathode foil together with a separator and impregnating it with an electrolyte, and this capacitor element. a flat bottomed cylindrical metal case that houses the metal case, a sealing body that seals the open end of the metal case, an anode lead terminal and a cathode lead terminal that are made of round bars derived from the capacitor element, It has an auxiliary terminal made of a round bar for fixing a capacitor fixed to the bottom of the metal case, and the anode and cathode lead terminals and the auxiliary terminal are bent, and their tips are attached to the side surface of the metal case. The planar portion is formed by pressing the tips of the anode and cathode lead terminals and the auxiliary terminal.

Effects According to the flat aluminum electrolytic capacitor having the above configuration, the tips of the anode and cathode lead terminals and auxiliary terminals, which are round bars, are pressed to form flat parts, which prevents contact with the printed circuit board. The area becomes large, and as a result, even if surface mounting is performed and soldering is performed, sufficient soldering strength can be obtained. As a result, even when a vibration test is performed, there is no problem with the soldering properties, and no peeling occurs even in the soldering of the terminals.

Example An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 11 denotes a capacitor element, and this capacitor element 11 is housed in a flat bottomed cylindrical metal turf 12 made of aluminum. The elastic sealing body 13 and the capacitor element 11 are fixed within the metal turf 12 by press-fitting the metal case 12 to maintain airtightness, and by curling the open end of the metal case 12. 14
15 is an anode lead terminal and a cathode lead terminal made of round bar lead wires. Further, to the bottom of the metal case 12, an auxiliary terminal 16 made of a round bar lead wire is fixed by welding in order to fix the capacitor to the M plate.

and the anode lead terminal 14 and the cathode lead terminal 1
5 and the auxiliary terminal 16 are bent, and their tips 14a, 15a, 18a are positioned on the same plane as the flat part 121L on the side surface of the metal case 712, allowing surface mounting on a printed circuit board. That's what I do. Also, the anode lead terminal 14, cathode lead terminal 16, and auxiliary terminal 16 are further connected to the tip portion 14&,
15a.

The anode lead terminal 14.16a is pressed to form a flat surface. Tip portions 142L of each of the cathode lead terminal 15 and the auxiliary terminal 16
, 15ya, 15& have good contact with the printed circuit board and the contact area becomes large, so soldering can improve the strength.

Effects of the Invention As is clear from the description of the above embodiments, the flat aluminum electrolytic capacitor of the present invention includes a capacitor element formed by winding an anode foil and a cathode foil together with a separator and impregnating the same with an electrolyte, and this capacitor element. a flat bottomed cylindrical metal case that houses the metal case, a sealing body that seals the open end of the metal case, and an anode lead terminal and a cathode lead terminal that are made of round bars derived from the capacitor element. , an auxiliary terminal consisting of a round bar for fixing the capacitor fixed to the bottom of the metal case, the anode and cathode lead terminals and the auxiliary terminal are bent, and their tips are attached to the side surface of the metal case. In addition, the tips of the anode and cathode lead terminals and auxiliary terminals are pressed to form a flat surface, which reduces the contact area with the printed circuit board. It can be installed on a printed circuit board in a stable state due to its large size, and even when soldering is performed for surface mounting, sufficient soldering strength can be obtained, and this makes it possible to secure the terminals during vibration tests. Soldering can also solve the problem of parts peeling off.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a flat aluminum electrolytic capacitor showing an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional flat aluminum electrolytic capacitor. 11...Capacitor element, 12.Medium...Metal case, 12a...Planar part, 13...Elastic sealing body, 14...Anode lead terminal, 15・・・
...Cathode lead terminal, 16...Auxiliary terminal,
141L, 15&, 16a... tip.

Claims (1)

[Claims] Wind the anode foil and cathode foil together with the separator,
and a capacitor element impregnated with an electrolyte, a flat bottomed cylindrical metal case for housing the capacitor element, a sealing body for sealing an open end of the metal case, and a capacitor element impregnated with an electrolyte. It has an anode lead terminal and a cathode lead terminal made of drawn-out round bars, and an auxiliary terminal made of a round bar for fixing the capacitor fixed to the bottom of the metal case, and the anode and cathode lead terminals and the auxiliary terminal have The tips of the anode and cathode lead terminals and the auxiliary terminals are bent so that their tips lie flush with the plane of the side surface of the metal case, and the tips of the anode and cathode lead terminals and auxiliary terminals are pressed to make them flat. A flat aluminum electrolytic capacitor characterized by having a section.