JPS58123716A - Chip type electrolytic condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This article is also about chip-lid electrolytic capacitors.

In recent years, with the advancement of semiconductor technology such as IC%LSI, electronic devices have become smaller and more sophisticated, making it easier to assemble!
1! Even in terms of scissor technology, automatic insertion and automatic loading of parts are being carried out. Seven laminated layers in capacitors
For tantalum capacitors and tantalum capacitors, chip parts without lead wires are in practical use. However, since an electrolytic solution is used in electrolysis, there are problems such as the structure of the sealing part becomes double wire and the height is 11. Electrolytic conductor is adopted and used in common with other chip parts.
The implementation method is also complicated, so I! II
As shown in IK, a tortoise was devised and attempted in which a crown-shaped metal cap 4 having a metal surface 3 on the outside which can be soldered is placed on both ends of an insulating container 2 made of synthetic resin containing a capacitor element l. However, if the electrolytic film leaks from the fitting part between the insulating container 2 and the crown-shaped metal cap 4, it may be necessary to apply adhesive with an elastic body interposed, and the fitting part may leak from the two ends. There were 4 hours of rounded parts that lacked airtightness.

The present invention eliminates the above-mentioned drawbacks and provides a small and highly reliable chip type electrolytic capacitor.

The present invention will be described below with reference to embodiments shown in FIGS. 2 to 12.

Figure 2 is a cross-sectional view of the case of a chip-type electrolytic capacitor.
Metal III that can be soldered such as Nikke A/% steel to the bottomed peripheral edge of the bottomed cylindrical metal case 5 made of aluminum etc.
IJ6 is formed by electroless mating, vapor deposition, etc., and then solder is plated on top! II7 was formed. FIG. 3 shows a metal terminal 8 for an anode, which is formed into a T-shaped cross section consisting of a small diameter part 8a and a large diameter part 8b by press-forming a metal with chemical properties such as aluminum.
A metal layer 6, which can be easily soldered such as nibkel or steel, is formed on the peripheral edge of b by electroless plating, S adhesion, etc., and a solder layer 7 is formed thereon by solder plating. The outer diameter of the nine largest diameter portions 8bO is approximately equal to, or medium to larger than, the outer diameter of the metal case 5. FIG. 4 shows an annular elastic body 9 made of silicone rubber, etc., with a large 9a in the center for attaching the small diameter part 8 & of the upper metal strut 8, and the outer diameter of the elastic body 90 is connected to the hole 91 with a metal terminal. 8
A is attached and inserted into the opening of the metal case. Figure 5 is a cross-sectional view of the chip salt electrolytic capacitor, showing the electrode foil for the anode and the electrode foil for the cathode Ki! For joining, tightening, etc. 1~0.2 rin thick plate or straight @
An anode tab 10 and a cathode tab 11 made of linear aluminum or the like with a thickness of about 0.6 mm are connected, respectively, and wound through a separator such as electrolytic paper to form a conductive element 12. Next, an elastic body 9 is attached to the periphery of the small diameter portion 8a of the metal terminal 8, and the anode metal terminal 8 and the anode tab 10, and the metal case S and the cathode tab 11 are connected to f.
# After contacting the element, impregnate the electrolytic solution with the condenser element, store it in the metal case 5, and attach the small diameter part 8a of the metal terminal 8 to the opening of the metal case 5. The assembly is completed by winding and sealing and covering with an insulating material 13. The insulating material 13 may be covered with a relatively heat-resistant heat-shrinkable chain such as polyester, or may be coated with epoxy resin. The electrolyte is the above-mentioned anode tab 10.
, it may be impregnated before the cathode tab 11 is welded.

The chip-type electrolytic capacitor of the present invention is manufactured as described above. Therefore, the T-shaped large diameter portion 8b of the metal terminal 8 has a solderable metal surface that can be directly connected to a printed circuit board. Since the small diameter portion 8a is sealed by wrapping the opening of the bottomed metal case 7-5 via the elastic body 9, the airtightness is significantly improved, and when it is attached to a printed circuit board and soldered, it is sealed. Even when heated, the stain-resolving solution does not leak and tuJ does not increase, making it possible to maintain extremely stable characteristics. Since the cathode side of the metal terminal 8 and the cathode side of the bottom of the metal case 5 are symmetrical in terms of weight, when automatically supplying capacitors, they can be easily arranged in the same direction K11, so that the polarity can be adjusted. There is no need to provide a discrimination mechanism, and productivity can be significantly improved.

Figures 6 to Igl1 are chip-based electrolytic capacitors! Figure 16 shows another example of the component parts, in which nibkels and metal Nll6, which can be soldered such as steel, are formed on the bottom and part of the periphery of a metal case made of aluminum, and the entire periphery is made of metal. In FIG. 7, a metal casing 14 whose outer surface is plated with solder, tin, etc. is fitted to the bottom of the metal case 5 and connected by welding or the like.
In FIGS. 8 and 9, a metal layer 6 and a metal cap 14 are similarly formed on the outer surface of a metal terminal 8, and can be manufactured in the same manner as in the above embodiment.

1011 and FIG. 11 are 4 in which a convex portion 8c having a larger small diameter portion 8a) and a smaller outer diameter 8c than the large diameter portion 8b are integrally formed on the inner side of the metal terminal 8 to form a T-shaped cross section. When the small diameter part 8a of the metal terminal 8 is attached to the opening of the metal case 5 through the elastic body 9 as shown in FIG. 12 and tightened, the airtightness is improved and the operating temperature range is expanded. I can do it. In this case, an explosion-proof mechanism may be added by providing a plurality of linear grooves along the outer peripheral surface or inner surface of the metal case in the O-axis direction.The shape of the metal case 5 is not limited to a cylindrical shape either. Can be set as required, such as elliptical or polygonal.

In addition, in the above-mentioned embodiments, the elastic body 9 and the anode metal terminal 8 may be integrally molded.

The figure shows the results of a 96-hour pressure tacker test on a rated 16V, 10μF chip cap electrolytic capacitor manufactured at 121)''r:, 2 atmospheres. It was demonstrated that the electrolyte solution did not leak and the airtightness was high.

As mentioned above, the chip cap electrolytic capacitor of the invention is small and can be produced at low cost, and has advantages such as being extremely advantageous in terms of quality and assembly and mounting, and has great industrial and practical value. It is.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional chip-bearing capacitor.
Figures ~ 12WA are examples of the present invention, Figures 2, □ Figures 6 and 7 are cross-sectional views of the metal case, Figure 3 is the metal terminal for the anode, 2) is the bottom view, and - is the cross section. Figure 4 is a perspective view of the elastic body, Figure 5m and Figure 12 are If! 911
is a cross-sectional view of another metal terminal for anode, Figures IIIO and 1111 are cross-sectional views of another metal terminal for anode and an elastic body attached, and Figure 13 is a comparison of the conventional product and the product of the present invention. It is a -1 characteristic diagram before and after a test. 5: Metal case 8: Anode metal terminal 8a: Small diameter portion 8b; Large diameter portion 9: Elastic body lo: Anode tab 11: Cathode tab 12: Capacitor element patent applicant Nippon Capacitor Industry Co., Ltd. Kasumi [Figure 1 Figure 5 Figure 18 taII600

Claims (1)

[Claims] A metal case made of aluminum or the like having a metal case that can be soldered at least in a dense manner, and a T-shaped cross section consisting of a small diameter part and a large @ part, It is equipped with a metal terminal for the anode made of Affi/lEuf, etc., which can be soldered at least on the periphery of the large diameter part, and an elastic body attached to the periphery of the small diameter part of the metal terminal. Then, connect the capacitor element to the metal terminal, connect the capacitor tab to the metal terminal, connect the capacitor to the element, connect the 9-pin connector 1 to the metal case, and connect the capacitor to the metal case. 4. A chip electrolytic capacitor, characterized in that the small rear end of a metal terminal is attached to the opening of the metal case, and the opening of the metal case is tightened to fit tightly together.