Pumps – Diverse pumps – Including rotary nonexpansible chamber type
Patent
1989-03-20
1991-11-05
Bertsch, Richard A.
Pumps
Diverse pumps
Including rotary nonexpansible chamber type
417 45, 4174233, F04D 1712, F04D 2500
Patent
active
050627716
ABSTRACT:
This invention concerns a production method and a processing apparatus for semiconductor devices, as well as an evacuating apparatus used for the processing apparatus. According to this invention, since the evacuation system of pressure-reduction processing apparatus for conducting various wafer processings during production steps of semiconductor devices is constituted only with oil-free vacuum pump, deleterious oil contaminations or carbonation products of oils produced from oils upon heating are not present in the pressure-reducing processing chamber as compared with conventional pressure-reducing processing apparatus using a vacuum oil pump as an evacuation pump and the production method of semiconductor devices using such apparatus. Accordingly, highly clean evacuated condition can be attained and, in addition, semiconductor devices at high reliability and with no degradation in the electric characteristics can be obtained by using the pressure-reducing processing apparatus having such a highly clean processing chamber.
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Aoki Kouzi
Gyobu Ichiro
Kusaka Tadao
Mase Masahiro
Muramatsu Kimio
Bertsch Richard A.
Hitachi , Ltd.
Hitachi Tokyo Electronics Co. Ltd.
Scheuermann David W.
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