DE1099645B - Airtight casing for electrolytic capacitors - Google Patents

Description

GERMAN

The invention relates to a known airtight, serving as a cathode envelope for electrolytic Capacitors, consisting of two nested, cylindrical metal cups of different Length with one with lead through connection contact pins for the inner, insulated on all sides Sealing and insulating body provided on one side of the anode part of the capacitor inner cup, the sealing and insulating body from which protrudes beyond the inner cup bent part of the outer cup is held.

In the further development of electrical engineering, especially in telecommunications and calculating machines, Electron tubes could largely be replaced by transistors and semiconductor elements, which are much smaller in their dimensions and in their construction than the tubes previously used. It is therefore desirable and often necessary that the functionally associated with these new components Individual parts can also be produced in reduced dimensions, which in many cases, however is fraught with difficulty.

For example, capacitors and other electrical components require different attention to be paid to their manufacture Design features with regard to the dimensional ratio of the individual parts to one another. For example would result in conventional sealing of electrolytic capacitors by pressing down a Insulating washer against a bead in the casing of a capacitor plus subsequent flanging the insulating washer in miniature capacitors has one opposite to the actual capacitor winding large space requirements for the seal. Therefore, for miniature capacitors, especially electrolytic capacitors in miniature version, another type can be used if the correct dimensional ratio is used should be maintained between the components of the capacitor, in addition Great importance should be attached to low production costs. ._

According to the invention, these practical needs are taken into account in that at one Electrolytic capacitor of the type mentioned above, the cans pushed into one another with their open ends with a snug fit are and the sealing and insulating body through the bent part of the outer Cup held with surface contact and pressed gegen.den bottom of the inner cup. details Another embodiment of the invention are in the description in conjunction with the drawings explained in more detail. It shows

1 shows an embodiment of a miniature electrolytic capacitor in plan view, partially broken away and greatly enlarged,

Airtight envelope
for electrolytic capacitors

Applicant:

PR Mallory & Comp. Inc.,
Indianapolis, Ind. (V. St. A.)

Representative: Dipl.-Ing. A. Berglein, patent attorney,
Munich 22, Widenmayerstr. 49

Roy A. Canty and Paul C. Lakin, Indianapolis, Ind.

(V. St. A.),
have been named as inventors

Fig. 2 shows the same capacitor partly in a vertical central section along the line II-II in Fig. 1, partly in side view and broken open,

3 is an exploded view of the main parts of the miniature electrolytic capacitor in FIG compared to FIGS. 1 and 2 somewhat enlarged representation.

The electrolytic capacitor shown in the drawings contains one that also serves as a negative pole Cup 1 made of fine silver sheet about 0.15 mm thick. This consists of the hollow cylindrical Wall 2, which is provided with a bottom wall 3 at one end. As a connection connection is in the middle of the bottom wall 3, a pin or wire 4 with a bottom plate 5 is arranged and attached this is welded or fastened in an electrically conductive manner. An inner cup also made of silver 6 preferably carries a top bottom wall 7 provided with a central opening 14 Conical sealing and insulating body 8 made from cast, elastic plastic. The winding 9 of the capacitor, which can preferably consist of tantalum, sits within the inner cup 6 and is through an all-round insulating jacket 10 with respect to this and the Bottom wall 3 of the outer cup 1 is isolated. On the capacitor winding is roughly in the middle of the upper end of the same a connection wire or pin 11 conductively attached, which through a bore 17 of the body 8 protrudes. The body 8 has a central one that is pressed into the opening 14 of the bottom wall 7 conical approach 12, which as an insulated bushing for the connecting wire 11 through

109 510/346

the wall 7 of the inner cup 6 serves and prevents contact with it. The diameter of the In the selected exemplary embodiment, opening 14 is approximately 1 mm.

The inner cup 6 is inserted into the outer cup 1 upside down with a snug fit so that its wood-cylindrical side wall 13 lies tightly against the inside of the side wall 2 of the outer cup 1 and touches the bottom wall 3 of the outer cup 1 with its end. The body 8 is between the bottom wall 7 and an inwardly beaded edge 15 protruding beyond the cup 6 the side wall 2 of the cup 1 held, wherein the inwardly bent edge is attached to the Body 8 presses. The body 8 is produced either together with the conical extension 12 in FIG one piece, or the conical extension 12 is made with a plate-shaped part 16 and over this is welded to the body 8.

When assembling the capacitor, the insulation sheath 10 is first as a tube over the The capacitor winding 9 is pushed and the ends of the insulation tube are folded over, so that the two ends of the winding 9 are isolated and sealed. Thereafter, the winding 9 encased by the insulation tube 10 in the inner cup 6 pushed in tightly, the connecting wire 11 through a small hole the insulation jacket 10 protrudes. Then the connecting wire or pin 11 is through the middle Bore 17 of the sealing and insulating body 8 and the central conical extension 12 passed, until the approach 12 surrounding the wire 11 to about 1.5 mm below the bottom wall 7 of the inner cup 6 is enough.

After that, in the outer cup 1, which is called The negative pole is used, a liquid electrolyte is filled up to a predetermined level and the inner one Cup 6 with the winding 9 pushed into the outer cup 1. This is done slowly to allow the air can escape without the electrolyte being squeezed out. When the inner cup 6 to the bottom wall 3 abuts, the protruding part 15 of the side wall 2 of the outer cup is at an angle bent inwards from 45 ° and pressed onto the sealing and insulating body 8 until it is at the top oozes out. As a result of this bias, the body 8 can expand and contract the housing parts 2.13 compensate for temperature changes and still maintain a good seal. Of the strong angle of inclination of 45 ° makes it possible to initially remove the protruding part 15 of the side wall 2 compress only a little to thereby center the body 8 and prevent this pushed out on one side or the protruding part 15 of the wall 2 bent unevenly will.

The sub-miniature electrolytic capacitor produced in this way has all previously known capacitors have various advantages. For example, the seal becomes independent made from the structure of the winding 9. Furthermore, there is very little room for the compressed Sealing and insulating body 8 required. For example, it exceeds the length of the finished capacitor the height of the winding only by 1.59 mm plus 0.12 to 0.75 mm clearance for the winding. aside from that is a very large surface contact between elastic plastic or rubber and metal present in the sealing. A particularly good one

ίο Sealing is achieved by pressing in the conical Approach 12 of the body 8 in the opening 14 is achieved. Another advantage of the capacitor according to the invention lies in the fact that the surface of the exposed part of the sealing or Insulating body is very small, whereby a penetration of moisture and the associated disadvantages are limited to a minimum with regard to the service life of the capacitor.

Claims (4)

Claims ·. 1. Airtight covering serving as a cathode for electrolytic capacitors, consisting of two nested, cylindrical metal cups of different lengths, with one with connecting contact pins passed through for the inner, all-round insulated anode part of the Capacitor provided sealing and insulating body on one side of the inner cup, wherein the sealing and insulating body from the bent over the inner cup protruding Part of the outer cup is held, characterized in that the cup (1,6) with their open ends are pushed into one another with a snug fit and the sealing and insulating body (8) held by the bent part (15) of the outer cup (1) with surface contact and is pressed against the bottom (7) of the inner cup (6). 2. Airtight envelope according to claim 1, characterized in that the sealing and Insulating body (8) is designed to be conical towards its outer end and with a conical Attachment (12) on the underside through the opening (14) in the bottom wall (7) of the inner cup (6) protrudes. 3. Airtight envelope according to claim 1, characterized in that the nested with a snug fit Cup (1, 6) made of silver or a similar metal and with an insulating cover (10) surrounding winding (9) consists of tantalum. 4. Airtight envelope according to claim 3, characterized in that the insulating envelope (10) has passage openings at the opposite ends of the winding. Considered publications:
German Patent No. 957 318;
British Patent Nos. 465 651, 554 361,
587 072, 597 288, 611900, 638 600. 1 sheet of drawings © 109 510/346 2. 61