Toyo Boseki Kabushiki Kaisha

Toshiba Corporation

The Tokyo Electric Power Company, Incorporated

Toshihiro Kashima

Tsukushi Hara

Masayuki Hoshino

Takeshi Ohkuma

Minoru Fukuda

Hideaki Maeda

Takashi Yazawa

Tokushiro Hirano

Kenji Tasaki

Eriko Yoneda

Masachika Nakano

Shunji Nomura

Atsuhiko Yamanaka

Masahiko Nakade

A bobbin for superconducting coils, which is made of a fiber-reinforced plastic material containing: (1) a matrix resin; (2) a polyethylene fiber having a negative thermal expansion coefficient in the fiber lengthwise direction, the angle between the polyethylene fiber and the longitudinal axis of the bobbin being in the range of .+-.35.degree. to 90.degree.; and (3) a substance having an elastic modulus higher than that of the polyethylene fiber. The bobbin of the present invention is useful for superconducting coils because it only exhibits a quite low degree of deformation, even when used under external stress at cryogenic temperatures.

Bobbin for superconducting coils

There are disclosed fiber-reinforced plastic materials with a composite structure including at least two kinds of fibers as reinforcing materials, which have reciprocal thermal expansion and contraction properties, and a synthetic resin as a matrix. The fiber-reinforced plastic materials of the present invention have the excellent advantages of exhibiting an extremely small degree of deformation caused by their thermal contraction, even when used under cryogenic circumstances.

Fiber-reinforced plastic material comprising stacked woven fabrics of

An optical recording medium having a thin film layer consisting mainly of an organic dye and formed on a substrate and characterized in that said thin film layer consists mainly of a dye mixture comprising a polymethine dye (A) and an aza-annulene dye (B).

Optical recording medium

Growing community of inventors

Otsu, Japan

Toshihiro Kashima