US 4,002,957 AGranted

Trimmable fixed hermetically sealed capacitor

AssigneeInternational Telephone and Telegraph Corporation

InventorMarvin A. Weisbrod

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Abstract

A "fixed" vacuum capacitor assembly in which first and second sets of interleaved, substantially concentric, capacitor plates are held between opposing end-bell assemblies. A trimmer capacitor including third and fourth sets of capacitor plates, an axial leadscrew assembly and a vacuum sealed axially extendable bellows are emplaced substantially coaxially within the first and second capacitor plate assembly. The third and fourth capacitor plates are variably interleavable in accordance with the leadscrew setting and these third and fourth plate sets together with the leadscrew bellows assembly occupy substantially the same axial dimension, between the end-bell assemblies, as is occupied by the first and second plate sets. A hollow cylindrical ceramic insulating body portion joins the two end-bell parts and the substantially smaller trimmer capacitor and the fixed capacitor formed by the interleaved first and second plate sets are electrically in parallel, the end-bells providing the electrical terminals thereof.

Claims8

Dependent claims

A hermetically sealed capacitor assembly comprising:

a sealed housing having generally opposite end walls;
first means providing a pair of electrical terminals for said capacitor assembly through said housing;
first and second fixed interleaved capacitor plate sets each electrically connected within said housing to a corresponding one of said terminals, said first and second plate sets substantially occupying the interior of said housing except for a central core volume therein extending between said opposite end walls;
trimmer capacitor means within said central core volume, said trimmer capacitor comprising a third fixed set of capacitor plates and a movable fourth set of plates interleaved therewith;
and second means including a generally elongated axially flexible wall member attached on one end to said fourth plate set and on the other end to and forming a portion of said housing end wall adjacent to the end of said central core and opposite said third set of capacitor plates, and a mechanical thrust adjustment operatively associated with said flexible wall member, said thrust member being arranged to position said fourth plate set, said thrust adjustment thereby deflecting said flexible wall member, said trimmer being thereby effectively electrically connected in parallel with the capacitor provided by said first and second plate sets.

2 more elements

Dependencies are inferred from the claim text.