Rohm Co., Ltd.

The University of Tokyo

Matsui Shikiso Chemical Co., Ltd.

Tadashi Kobayashi

Hideki Nishiyama

Masafumi Seike

Atsushi Momota

Senshi Fukashiro

Goro Shimizu

Masayasu Kamada

Toshihisa Maeda

Tengai Kubo

This position detection system comprises a mobile station that transmits a beacon signal, a plurality of fixed stations that receive the beacon signal, and a position analysis device that acquires position information for the mobile station by estimating the position of the mobile station from the reception intensities of the beacon signal at each fixed station. The mobile station includes a movement detection unit (acceleration sensor, geomagnetic sensor, etc.) that determines when movement has stopped. While the movement of the mobile station has stopped, the position analysis device stops estimating the position of the mobile station and keeps the position information at a fixed position.

Position detection system

A positioning system includes: a gyro sensor configured to detect an angular velocity of a moving body; a geomagnetic sensor configured to detect a direction in which the moving body is placed; an acceleration sensor configured to detect an acceleration of the moving body; and a gyro sensor output correction part configured to correct an output of the gyro sensor, wherein the gyro sensor output correction part is configured to convert output components of the gyro sensor into at least one of a rotation matrix and a quaternion based on output components of the geomagnetic sensor and output components of the acceleration sensor, and to calculate a posture of the moving body based on the rotation matrix or the quaternion.

Positioning system and positioning method

This electronic compass has a magnetic sensor for detecting two predetermined axis components out of the three geomagnetic axis components in a location and generating biaxial magnetic detection data corresponding to the magnitudes of the components, an acceleration sensor for detecting three axis components of the acceleration thereof and generating triaxial acceleration detection data corresponding to the three axis components, and an azimuth angle detection unit for calculating assumed magnetic detection data corresponding to the one remaining undetected axis component of the three geomagnetic axis components from the biaxial magnetic detection data, the triaxial acceleration detection data, and the magnitude and the magnetic dip of the geomagnetic field and detecting an azimuth angle by determining the component of the geomagnetic field parallel to the surface of the earth using the assumed magnetic detection data.

Electronic compass

In this azimuth angle sensor, original magnetic detection data is sequentially acquired as data points in a triaxial coordinate system by detecting magnetism on three axes. An offset derivation device provided to the azimuth angle sensor derives offset values for correcting the original magnetic detection data and generating corrected magnetic detection data. The offset derivation device uses a plurality of data points in the original magnetic detection data or in the corrected magnetic detection data to derive provisional offset values, then derives the magnitude of magnetism on such an occasion on the basis of the original magnetic detection data and the provisional offset values. When the magnitude of magnetism thus derived is within a predetermined correction success range, the offset values are updated using the provisional offset values. When the magnitude of magnetism thus derived is not within the predetermined correction success range, the offset values are not updated.

Offset derivation device, offset calculation device, and azimuth sensor

A subject performs a sit-to-stand operation while wearing a device (SU) that contains an acceleration sensor () on the front of the chest. The present invention derives a muscular strength index representing the muscular strength of a human body by obtaining maximum acceleration value data from a signal expressing the size of an acceleration vector comprising a tri-axial component in detected acceleration, and using the maximum acceleration value data and the muscle mass or body fat mass of the subject. The present invention has the ability to derive a physical activity amount from the acceleration detection results, and on the basis of the activity amount (ACT) during a prescribed activity target period and the muscular strength index at the start and end times of the activity target period, obtains an activity efficiency index that corresponds to changes in the muscular strength index in response to the amount of activity.

Index deriving device, wearable device, and mobile device

For triaxial magnetic detection data sequentially acquired as data points in a triaxial coordinate system, an offset calculation unitcalculates virtual data points P'-P&#x2032; by evenly parallel-translating each of data points P-Pso that a reference data point P, for example, arbitrarily chosen from the data points P-Pcoincides with an origin point O. A virtual offset point C&#x2032; for which the sum of the distances between the virtual data points P&#x2032;-P&#x2032; and a curved surface Hpassing through the origin point O is minimized is then calculated. An offset value C for the magnetic detection data is then calculated by parallel-translating the virtual offset point C&#x2032; so as to restore the parallel-translated portion.

Offset calculation device and azimuth sensor therewith

The present invention involves a test subject performing a sit-to-stand (STS) operation while wearing a device (MD) that contains an acceleration sensor () on the front of the chest. The present invention derives a muscular strength index (maximum acceleration value per unit of muscle mass during STS activity) representing the muscular strength of a human body by obtaining maximum acceleration value data from a signal expressing the size of an acceleration vector comprising a tri-axial component in detected acceleration, and using the maximum acceleration value data and the muscle mass or body fat mass of the text subject.

An abnormality detection apparatus () is configured to detect an abnormality of a lighting device (). The abnormality detection apparatus () includes an illuminance sensor (), a memory () and a controller (). The controller () is configured to detect the abnormality of the lighting device () based on a criterion stored in the memory () and a difference between an illuminance detected by the illuminance sensor () during on state of the lighting device () and an illuminance detected by the illuminance sensor () during off state of the lighting device ().

Abnormality detection apparatus and notification apparatus

Disclosed is a thermochromic color masterbatch for use in a thermoplastic resin comprising a wax having substantially homogeneously dispersed therein a thermochromic granular material which is coated with a hydrophilic high-molecular weight substance, said thermochromic granular material being a mixture of a thermochromic composition comprising an electron-donating chromogen, an electron acceptor and a solvent with a thermosetting resin.

Growing community of inventors

Kyoto, Japan

Tadashi Kobayashi