Asahi Kasei Microdevices Corporation

Kabushiki Kaisha Toshiba

Nec Corporation

Asahi Kasei Emd Corporation

Makoto Kataoka

Takenobu Nakamura

Shigeki Okatake

Seiichi Kato

Atsushi Yamamoto

Takeshi Kojima

Tsutomu Okutomi

Tsuneyo Seki

Toshiro Yamamoto

Takashi Kusano

Hirotsugu Kinoshita

Kiyomi Sakamoto

Yo Yamagata

Kimiya Sato

Katsumi Kakuta

Yoshitaka Moriyasu

Yuichi Kanayama

Taisuke Fujita

Tatsuhiko Yayoi

Kazuki Seko

Tomio Takahashi

Atsushi Ohashi

A magnetic field measuring apparatus is provided including: a magnetic sensor array configured so that a plurality of magnetic sensor cells including a plurality of magnetic sensors each having a magnetoresistive element and magnetic flux concentrators arranged on both ends of the magnetoresistive element are three-dimensionally arranged and capable of detecting a magnetic field in three axial directions; a magnetic field acquiring section configured to acquire measurement data measured by the magnetic sensor array; and a signal space separating section configured to perform signal separation on a spatial distribution of a magnetic field indicated by the measurement data, based on basis vectors calculated from orthonormal functions and a position and magnetic sensitivity of each magnetic sensor of the magnetic sensor array.

Magnetic field measuring apparatus, magnetic field measuring method, and recording medium storing magnetic field measuring program

Provided is a magnetic field measurement device which includes a magnetic sensor array that is composed of a plurality of magnetic sensor cells, each of which has a magnetic sensor and an output unit for outputting an output signal, arranged at lattice points between two curved surfaces, each of which is bent in one direction, so as to be three-dimensionally arranged, and is capable of detecting an input magnetic field in three-axial directions, a measurement data acquisition unit configured to acquire measurement data measured by the magnetic sensor array, and a magnetic field reconstruction unit configured to reconstruct a magnetic field of a component orthogonal to a virtual sensor array plane with respect to one or more positions on the virtual sensor array plane, which is a plane specified in a three-dimensional space, using the measurement data.

Magnetic field measurement device, magnetic field measurement method, and recording medium having magnetic field measurement program recorded thereon

In order to provide a technique capable of presenting information that is different from the image of a surveillance camera and is effective for searching for a person, this search information providing device includes, as functional units, a collation unit and an output unit. The collation unit collates a fingerprint image obtained by a fingerprint photographing device with a fingerprint image, of a search target person, given in advance. When the fingerprint image on the handrail member matches the fingerprint image of the search target person, the output unit outputs information indicating that the search target person has been detected to a predetermined reporting destination.

Search information providing device, search information providing system, search information providing method, and program recording medium

Provided is a magnetic field measuring apparatus for: acquiring the measurement data measured by a magnetic sensor array that is configured by arraying the plurality of magnetic sensor cells to form a surface covering at least a part of a target object to be measured; performing signal separation on a magnetic field spatial distribution indicated by the measurement data based on a position and magnetic sensitivity of each magnetic sensor; generating a calibration magnetic field at a position on a straight line that can be drawn without crossing the plurality of magnetic sensor cells from the measurement space outside the measurement space; and calibrating a sensor error for the magnetic sensor based on a separation error in a case where signal separation has been performed on a spatial distribution of the calibration magnetic field.

Magnetic field measuring apparatus, magnetic field measuring method and recording medium with magnetic field measuring program recorded thereon

There is provide a magnetic field measurement device including: a magnetic sensor array configured by a plurality of magnetic sensor cells, each of which has a magnetic sensor; a magnetic field acquisition section configured to acquire measurement data measured by the magnetic sensor array; a signal space separation section configured to perform signal separation to separate, into internal space data and external space data, a spatial distribution of a magnetic field which is indicated by the measurement data, based on a position and a magnetic sensitivity of each magnetic sensor; and a calculation processing section configured to remove, from the internal space data, at least a part of a variation component common to magnetic field measurement data that indicates the spatial distribution of the magnetic field which is indicated by the measurement data, and the external space data.

Magnetic field measurement device, magnetic field measurement method, and recording medium having recorded thereon magnetic field measurement program

A measurement apparatus is provided, which includes a magnetic sensor array formed by three-dimensionally arranging a plurality of magnetic sensor cells each including a magnetic sensor, and capable of detecting an input magnetic field in three axial directions; a measurement data acquiring section that acquires a plurality of measurement values based on the input magnetic field detected by the magnetic sensor array; a magnetic field calculating section that calculates the input magnetic field based on the measurement values; an error calculating section that calculates a detection error of the input magnetic field, based on the plurality of measurement values and a calculation result obtained by calculating the input magnetic field; and a measurement data selecting section that selects a plurality of measurement values to be used for calculating the input magnetic field by the magnetic field calculating section, from among the plurality of measurement values, based on the detection error.

Magnetic field measurement apparatus

A Hall electromotive force signal detection circuit combines offset cancellation means by a spinning current method of a Hall element with a continuous-time signal processing circuit. A Hall element includes first to fourth terminals, and generates a Hall electromotive force signal voltage Vhall. Another Hall element generates another Hall electromotive force signal voltage Vhall. A first switching circuit selects a terminal position for applying a drive current from the four terminals of the Hall element. A second switching circuit selects a terminal position for applying a drive current from the four terminals of the another Hall element, which is different from the terminal position selected by the first switching circuit. A chopper clock generation circuit supplies a chopper clock signal &#x3c6;having two different phases to the switching circuit, and also supplies the chopper clock signal &#x3c6;to the first and second switching circuits.

Hall electromotive force signal detection circuit and current sensor thereof

By restricting the concentration and the depth of an n-type impurity region which is a magnetosensitive portion of a Hall device to appropriate ranges, it is possible to improve linearity of temperature characteristics in detecting a magnetic field intensity with high accuracy. In order to obtain linearity of the temperature characteristics of the constant-current sensitivity, there is provided a Hall device including a p-type impurity regionand an n-type impurity regionthat is disposed on the p-type impurity regionand that serves as a magnetosensitive portion, wherein an n-type impurity concentration N and a distribution depth D of the n-type impurity regionsatisfy relational expressions of N&#x3c;1.0&#xd7;10and N&#x3e;3.802&#xd7;10&#xd7;D.

Hall device, magnetic sensor having same, and signal correcting method thereof

The present invention relates to a magnetic sensor with which magnetic characteristics are made extremely stable by consideration of an area of contact of a base layer of a magnetic substance and a semiconductor substrate. On a semiconductor substrate () a plurality of Hall elements () are embedded so as to be coplanar to a top surface of the semiconductor substrate while being mutually spaced apart by a predetermined distance, and above the Hall elements and the semiconductor substrate, a base layer (), having coefficient of thermal expansion differing from that of the Hall elements and partially covers a region of each Hall elements, is formed via a protective layer (), and a magnetic flux concentrator (), having an area larger than the base layer and with magnetic amplification, is formed on the base layer. An area of contact of the base layer of the magnetic substance and the semiconductor substrate is made small to lessen the generation of an offset voltage.

Magnetic sensor and method of manufacturing thereof

There are provided an operating mechanism that drives the opening/closing of contacts, and a sliding conduction part that forms electrical connection of these contacts and the main circuit on receipt of a connection voltage; grease is applied to the mechanical sliding part of the operating mechanism and to the sliding conduction part. The grease has as base oil at least one synthetic oil and is selected from the group consisting of poly &agr;-olefins and dialkyl diphenyl ethers, and contains as thickener 5-30 mass % of a urea compound. The dynamic viscosity of the base oil is 30-500 mm /s at 40&deg; C.

Power circuit switch

A contact material for forming a contact included in a vacuum interrupter comprises 50 to 70% by weight of a conductive material containing Cu as a principal component, an arc-proof material containing at least either TiC or VC and having a mean particle diameter of 8 &mgr;m or below, and 0.2 to 2.0% by weight of Cr on the basis of the sum of the respective amounts of Cr and Cu or 0.2 to 2/0% by weight of Zr on the basis of the sum of the respective amounts of Zr and Cu. The contact material has a hydrogen content in the range of 0.2 to 50 ppm.

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Tokyo, Japan

Makoto Kataoka