The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 1983
Filed:
Jul. 29, 1981
Masashi Nakatsukasa, Fuchu, JP;
Nobuyuki Takahashi, Fuchu, JP;
Anelva Corporation, Tokyo, JP;
Abstract
In a sputtering apparatus comprising a main chamber for carrying out sputtering and a preliminary chamber for preliminarily processing a substrate prior to sputtering, a gate valve interposed between the chambers is opened with the pressure in the preliminary chamber is reduced lower than that in the main chamber after completion of the preliminary processing. The pressure reduction is carried out by reducing supply of a gas into the preliminary chamber by the use of a pressure control system coupled to the preliminary chamber. Preferably, the supply of the gas is bypassed through a valve to an exhausting system for the preliminary chamber. Alternatively, the pressure in the main chamber is made higher than that in the preliminary chamber after completion of the preliminary processing by squeezing an evacuation system for the main chamber to reduce the rate of evacuation. Supply of the gas into the preliminary chamber and evacuation of the main chamber may be simultaneously reduced.