Patent ID: 9234586
Filing Date: 2016-01-12
CPC Classification: F15B,F16J,F16K

Claim Text:
1. A linear actuator for use with a vacuum chamber in which plasma is generated, comprising a moving member which extends between the exterior and the interior of the vacuum chamber through an opening provided in the vacuum chamber and which is configured to be rectilinearly reciprocated; a drive section which is configured to reciprocate the moving member; a cover for covering the moving member; and a slide seal section for providing a seal between the interior and the exterior of the vacuum chamber while allowing the cover to slide thereon; wherein the cover covers a range of the moving member which is moved into both of the interior and the exterior of the vacuum chamber in the course of reciprocation of the moving member by the drive section, and an outer surface of the cover is smaller in the amount of gas adsorption per unit area than an outer surface of the moving member.