Rohm Co., Ltd.

The University of Tokyo

Masafumi Seike

Tadashi Kobayashi

Hideki Nishiyama

Atsushi Momota

Senshi Fukashiro

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

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 ().

Growing community of inventors

Kyoto, Japan

Masafumi Seike