Method of making a dual value capacitor

Details Method of making a dual value capacitor Method of making a dual value capacitor

1977-09-14

1979-10-16

Hall, Carl E.

Metal working

Electric condenser making

Solid dielectric type

242 561, 361307, 361310, 361330, H01G 432, H01G 438

Patent

active

041708121

ABSTRACT:
An auxiliary capacitor is added to a first capacitor formed from two metallized films wound into a cylindrical roll. Once the two metallized films have been wound a sufficient number of layers to form a capacitor having the desired capacitance, the auxiliary capacitor is added by one of two methods. In the first method, one of the metallized films is cut and a plain film is inserted between the roll and the uncut metallized film. After the plain film has been inserted and wound a portion of a turn, a metal foil is inserted between the plain film and the dielectric side of the uncut metallized film. The two films and foil then are wound together a sufficient number of layers to form the desired capacitance of the auxiliary capacitor.
An electrical contact foil may be added between the plain film and the metal foil or the metal foil may be left slightly exposed for electrical contact to be made to it.
In the second method both metallized films are first terminated. The core then may be sealed and heat treated. A plain film is first wound around the core, then a third metallized film is inserted between the roll and the plain film and wound a portion of a turn. Then, the metal foil is inserted between the dielectric side of the third metallized film and the roll and wound for the desired number of turns. Electrical contact is made as described before.

REFERENCES:
patent: 1658501 (1928-02-01), Valle
patent: 3522496 (1970-08-01), Grahame
patent: 4028595 (1977-06-01), Stockman

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