Hitachi Cable, Inc.

Hitachi, Ltd.

Nippon Telegraph and Telephone Corporation

Keiichi Higuchi

Satoshi Aoki

Masahiro Yanagisawa

Hisato Uetsuka

Masayoshi Kaneyasu

Yasufumi Yamada

Takashi Onimoto

Tatsuo Teraoka

Hiroaki Okano

Yasunori Iwafuji

Kazuhiro Komatsuzaki

A magnetic motion sensor has: two magnetic sensors aligned in a direction along which changes in a magnetic field shift for detecting an appearance of the changes; a differential means for taking out a differential signal of output signals from these two magnetic sensors; and a timing detection means for generating a pulse, indicating a timing at which the changes in a magnetic field pass through either of the magnetic sensors, when an output signal of the magnetic sensor in question strides over a threshold value, while generating a pulse, indicating a timing at which the changes in a magnetic field pass through in between the magnetic sensors, when the differential signal strides over the threshold value.

Magnetic motion sensor

An optical waveguide 3 comprises a substrate like a Si substrate having a projection with a flat surface and inclined side surfaces thereon, a buffer layer having a refractive index of n.sub.0 formed on lower surfaces of the substrate, a secondary buffer layer having a refractive index of n.sub.0 formed on the buffer layer, a core waveguide having a refractive index of n.sub.1 formed on the secondary buffer layer and a cladding layer having a refractive index of n.sub.0 covering the core waveguide. The flat surface of the projection 31 is exposed through an opening. The secondary buffer layer controls a transmission loss increase caused by partial thickness differences of the ground buffer layer or scattering by scratches or strains created by the grind.

Optical waveguide, method of making the same and integrated optical

Growing community of inventors

Ibaraki, Japan

Keiichi Higuchi