Patent ID: 9382621
Filing Date: 2016-07-05
CPC Classification: C23C,H01J,H01L

Claim Text:
1. A radio frequency return device for a plasma processing chamber, comprising: a base having a shaft movably disposed within an opening formed in the base; a first spring form comprising a compression spring disposed about the shaft on one side of the base, wherein the shaft comprises a removable collar that retains the first spring form on an end of the shaft opposite the base; a tubular member extending between the base and the removable collar, wherein the shaft and the first spring form are disposed within the tubular member; a second spring form comprising a strap coupled between the base and an opposite end of the shaft on an opposing side of the base relative to the first spring form, the second spring form extending from the opposite end of the shaft to the base on opposing sides of the shaft and comprising: a first material made of a metal or metal alloy having an elastic property that is substantially the same at an ambient temperature and a processing temperature of about 200 C or greater; and a second material substantially encasing the first material, the second material being different than the first material; and a contact pad coupled to the second spring form.