Patent
1975-09-29
1977-02-08
Goldberg, E. A.
317251, H01G 514
Patent
active
040074064
ABSTRACT:
A sealed variable capacitor assembly including a generally cylindrical metallic enclosure in which fixed and movable interleaving capacitor plate sets are contained, the movable set being varied by axial translation thereof by means of a leadscrew arrangement within a bellows which effects sealing while permitting the required axial translation of the movable plates. Spring fingers connected to the moving plate subassembly engage at least a portion of the inside surface of the metallic enclosure slidably. Accordingly, the RF current path from the movable plates largely bypasses the bellows permitting the latter to be of a relatively small diameter. The mounting of the fixed plate set is by means of a rigid feedthrough insulator mounted through the end-wall of the enclosure opposite the end from which the aforementioned lead-screw extends. The device is therefore adapted for operation on relatively high gas pressures therein to obtain high voltage rating without the danger of explosion inherent in glass and ceramic enclosures commonly used in similar devices.
REFERENCES:
patent: 2740077 (1956-03-01), Clarke
patent: 3495142 (1970-02-01), Herrgen
patent: 3646412 (1972-02-01), Boersma
Goldberg E. A.
International Telephone and Telegraph Corporation
O'Neil William T.
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