Tokin Corporation

Olympus Optical Company, Ltd.

Nec Tokin Corporation

Hiroshi Abe

Tetsuo Yoshida

Naoki Wakou

Hiroshi Watanabe

Masayoshi Esashi

Takashi Mizusaki

Kazutake Muto

Tadayuki Matsuo

An orientation angle detector using gyroscopes ( ) for detecting X-, Y- and Z-angular velocities which are time-integrated ( ) to produce pitch, roll and yaw angles (&ggr;, &bgr;, &agr;) of the orientation. Two accelerometers ( ) are used to obtain tentative pitch and roll angles in order to correct the pitch and roll angles, and two terrestrial magnetometers ( ) are used to obtain a tentative yaw angle so as to correct the yaw angle. When the tentative pitch, roll and yaw angles are defined accurate ( ), the integrated pitch, roll and yaw angles are corrected ( ) by the tentative pitch, roll and yaw angles.

Orientation angle detector

A piezoelectric vibratory gyroscope utilizing an energy-trapping vibration mode comprises a piezo-electric plate having a principal surface and polarized in a thickness direction, and first through n-th electrodes (n being an integer not smaller than three) formed in a generally central area of the principal surface at positions corresponding to first through n-th vertexes of a polygon having n angles. When the piezoelectric plate is excited in the energy-trapping vibration mode of a primary vibration, rotation of the piezoelectric plate around an axis perpendicular to the principal surface of said piezoelectric plate produces the Coriolis force to excite a secondary vibration which induces electric voltages at the first through the n-th electrodes. A voltage difference is detected for at least two of the first through the n-th electrodes.

Piezoelectric vibratory gyroscope utilizing an energy-trapping vibration

An ion sensor and more particularly ion sensitive field effect transistor comprising an inorganic film, and an impurity layer formed in at least surface layer of said inorganic film by thermal diffusion or ion implantation.

Ion sensor FET with surface treated metal gate

Growing community of inventors

Sendai, Japan

Hiroshi Abe