Hitachi, Ltd.

Elpida Memory, Inc.

Keiichi Tsuchiya

Katsukuni Hisano

Masao Shiga

Seishin Kirihara

Toshimi Tan

Takatoshi Yoshioka

Kei Kobayashi

Masahiro Kobayashi

Kazuhiko Ueda

A semiconductor device may include, but is not limited to a first electrode upwardly extending, and a second electrode upwardly extending along the first electrode. The first electrode includes a lower portion and an upper portion. The second electrode covers a bottom surface and an outer side surface of the lower portion of the first electrode. The upper portion of the first electrode is positioned higher than the second electrode.

Semiconductor device

A rotor shaft suitable for use as the rotor shaft of a steam turbine. The rotor shaft has a rotor shaft portion made of a Cr alloy steel having martensite structure and containing 8 to 13% Cr. The rotor shaft body is provided with at least one journal portion at which the rotor shaft is rotatably supported by a bearing. The rotor shaft further has a sleeve fitted around each journal portion. The sleeve is divided in the circumferential direction into a plurality of segments which are assembled together by welding or fitting into the sleeve having a circular cross-section. Due to the provision of the sleeve around the journal portion, the rotor shaft made of Cr alloy steel can have improved bearing properties.

Rotor shaft

Growing community of inventors

Tokyo, Japan

Keiichi Tsuchiya