Patent ID: 7042699
Filing Date: 2006-05-09
Classification: H01G

Abstract:
1. A vacuum variable capacitor comprising: a vacuum container formed by sealing both end of a cylindrical insulator with a fixed-side end plate and a movable-side end plate; a movable conductive member disposed opposite to the fixed-side end plate in the vacuum container, the movable conductive member extending from an inside of the vacuum container to an outside of the vacuum container, the movable conductive member being movable along a center axis of the vacuum container; a fixed electrode provided on the fixed-side end plate; a movable electrode provided on the movable conductive member; a first bellows provided in the vacuum container, an end of the first bellows being connected to the movable-side end plate, the other end of the first bellows being connected to the movable conductive member; a rotating portion rotatably disposed outside of the vacuum container; and a ball screw through which the movable conductive member is supported by the rotating portion so as to move along the axis direction of the vacuum container according to a rotation of the rotating portion.