Patents by Inventor Eiji Kako
Eiji Kako has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8698503Abstract: A geomagnetic application device including a triaxial magnetic sensor, a measurement point acquiring mechanism, a calibration mechanism calibrating offset of the magnetic sensor, and an azimuth calculator. The calibration mechanism includes an offset calculation measurement point selector selecting at least six measurement points of the geomagnetic vectors from among a data set stored in the measurement point storage unit by the measurement point acquiring mechanism and storing the selected measurement points in an offset calculation measurement point storage unit. The offset calculation measurement point selector selects the measurement points from among the data set stored in the measurement point storage unit to include at least six points, component values of which are maximum or minimum in each of three orthogonal axes.Type: GrantFiled: January 30, 2012Date of Patent: April 15, 2014Assignee: Aichi Micro Intelligent CorporationInventors: Yoshinobu Honkura, Katsuhiko Tsuchida, Eiji Kako, Ryuji Masaki
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Publication number: 20130307547Abstract: A geomagnetic application device including a triaxial magnetic sensor, a measurement point acquiring mechanism, a calibration mechanism calibrating offset of the magnetic sensor, and an azimuth calculator. The calibration mechanism includes an offset calculation measurement point selector selecting at least six measurement points of the geomagnetic vectors from among a data set stored in the measurement point storage unit by the measurement point acquiring mechanism and storing the selected measurement points in an offset calculation measurement point storage unit. The offset calculation measurement point selector selects the measurement points from among the data set stored in the measurement point storage unit to include at least six points, component values of which are maximum or minimum in each of three orthogonal axes.Type: ApplicationFiled: January 30, 2012Publication date: November 21, 2013Applicant: Aichi Micro Intelligent CorporationInventors: Yoshinobu Honkura, Katsuhiko Tsuchida, Eiji Kako, Ryuji Masaki
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Patent number: 7886600Abstract: A motion sensor which can easily and accurately detect bearing, attitude and acceleration in any of three-dimensional directions and a portable telephone using the same. The motion sensor comprises three magnetic sensing parts for detecting magnetic field strength in 3-axis directions orthogonal to one another, and three acceleration sensing parts for detecting accelerations in the 3-axis directions. Each of the acceleration sensing parts has a magnet body constituted to be able to displace depending on acceleration, and a magnet displacement detection head for detecting a displacement of the magnet body. The three magnetic sensing parts and the three magnet displacement detection heads are all made of the same type of magnetic detection elements which operate based on common operation principles. The three magnetic sensing parts and the three acceleration sensing parts are integrated into one modular package together with one electronic circuit for controlling these six magnetic detection elements.Type: GrantFiled: June 1, 2006Date of Patent: February 15, 2011Assignees: Aichi Steel Corporation, Softbank Mobile Corp.Inventors: Yoshinobu Honkura, Michiharu Yamamoto, Masaki Mori, Eiji Kako, Toshiro Matsumura, Jun Yamazaki, Hirohisa Kusuda, Yasuhiro Nishide, Daisuke Tsujino
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Patent number: 7420364Abstract: An attitude detection sensor includes three magnetic sensing parts that detect magnetic field strength in respective directions along three axes perpendicular to each other, and two tilt sensing parts that detect tilt angles around two axes perpendicular to each other. The tilt sensing parts each include a cantilever having a magnet body that moves in accordance with the tilt angle, and a magnetic detection head that detects a displacement of the magnet body. The three magnetic sensing parts and the two magnetic detection heads are each formed using a magnetic detection element of the same type. At least one electronic circuit for controlling the five magnetic detection elements, the three magnetic sensing parts, and the two tilt sensing parts is disposed in a single package in the form of a module.Type: GrantFiled: May 17, 2005Date of Patent: September 2, 2008Assignees: Aichi Steel Corporation, Vodafone K.K.Inventors: Yoshinobu Honkura, Michiharu Yamamoto, Yoshiaki Kohtani, Masaki Mori, Eiji Kako, Tomohiko Nagao, Toshiro Matsumura, Hirohisa Kusuda, Yasuhiro Nishide, Daisuke Tsujino, Jun Yamazaki, Takashi Katayama
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Patent number: 7278219Abstract: A magnetic compass includes: a three-axis magnetic sensor for detecting geomagnetic vector as geomagnetic components in directions of three orthogonal axes x, y, and z; a data-plane calculating unit for calculating a data plane on which output data of the three-axis magnetic sensor are present in a sensor coordinate system of the three axes x, y, and z; a unit vector calculating unit for calculating unit vectors of a horizontal coordinate system of three orthogonal axes X, Y, and Z whose Z-axis runs vertically and X-Y plane defines a horizontal plane relative to the earth; a horizontal coordinate system conversion unit for converting geomagnetic components in the sensor coordinate system detected by the three-axis magnetic sensor into geomagnetic components in the horizontal coordinate system; an azimuth calculating unit for calculating azimuth based on the converted geomagnetic components in the horizontal coordinate system; and a display unit for displaying the calculated azimuth.Type: GrantFiled: June 2, 2006Date of Patent: October 9, 2007Assignee: Aichi Micro Intelligent CorporationInventors: Yoshinobu Honkura, Katsuhiko Tsuchida, Hitoshi Aoyama, Eiji Kako
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Patent number: 7219549Abstract: An accelerometer for measuring the displacement of a magnet body using magnetic detecting elements is provided, the accelerometer having superior measurement accuracy by suppressing influence of a peripheral magnetic field. The accelerometer has detecting units each having a cantilever which is elastically deformed so as to rotate around a fixed end thereof, a magnet body provided at a free end of the cantilever, and a magnetic detecting head portion disposed outside the rotation region of the cantilever. In order to correct detection signals output from the magnetic detecting head portions, the accelerometer has peripheral magnetic field detecting portions for measuring a peripheral magnetic field acting on the magnetic detecting head portions and the magnet bodies.Type: GrantFiled: March 21, 2005Date of Patent: May 22, 2007Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Michiharu Yamamoto, Yoshiaki Koutani, Masaki Mori, Eiji Kako, Kouei Genba, Takumi Asano, Naoki Ishikawa
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Publication number: 20070084070Abstract: A magnetic compass includes: a three-axis magnetic sensor for detecting geomagnetic vector as geomagnetic components in directions of three orthogonal axes x, y, and z; a data-plane calculating unit for calculating a data plane on which output data of the three-axis magnetic sensor are present in a sensor coordinate system of the three axes x, y, and z; a unit vector calculating unit for calculating unit vectors of a horizontal coordinate system of three orthogonal axes X, Y, and Z whose Z-axis runs vertically and X-Y plane defines a horizontal plane relative to the earth; a horizontal coordinate system conversion unit for converting geomagnetic components in the sensor coordinate system detected by the three-axis magnetic sensor into geomagnetic components in the horizontal coordinate system; an azimuth calculating unit for calculating azimuth based on the converted geomagnetic components in the horizontal coordinate system; and a display unit for displaying the calculated azimuth.Type: ApplicationFiled: June 2, 2006Publication date: April 19, 2007Applicant: AICHI MICRO INTELLIGENT CORPORATIONInventors: Yoshinobu Honkura, Katsuhiko Tsuchida, Hitoshi Aoyama, Eiji Kako
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Publication number: 20070069721Abstract: An attitude detection sensor includes three magnetic sensing parts that detect magnetic field strength in respective directions along three axes perpendicular to each other, and two tilt sensing parts that detect tilt angles around two axes perpendicular to each other. The tilt sensing parts each include a cantilever having a magnet body that moves in accordance with the tilt angle, and a magnetic detection head that detects a displacement of the magnet body. The three magnetic sensing parts and the two magnetic detection heads are each formed using a magnetic detection element of the same type. At least one electronic circuit for controlling the five magnetic detection elements, the three magnetic sensing parts, and the two tilt sensing parts is disposed in a single package in the form of a module.Type: ApplicationFiled: May 17, 2005Publication date: March 29, 2007Applicants: AICHI STEEL CORPORATION, Vodafone K.K.Inventors: Yoshinobu Honkura, Michiharu Yamamoto, Yoshiaki Kohtani, Masaki Mori, Eiji Kako, Tomohiko Nagao, Toshiro Matsumura, Hirohisa Kusuda, Yasuhiro Nishide, Daisuke Tsujino, Jun Yamazaki, Takashi Katayama
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Publication number: 20070068252Abstract: A motion sensor which can easily and accurately detect bearing, attitude and acceleration in any of three-dimensional directions and a portable telephone using the same. The motion sensor comprises three magnetic sensing parts for detecting magnetic field strength in 3-axis directions orthogonal to one another, and three acceleration sensing parts for detecting accelerations in the 3-axis directions. Each of the acceleration sensing parts has a magnet body constituted to be able to displace depending on acceleration, and a magnet displacement detection head for detecting a displacement of the magnet body. The three magnetic sensing parts and the three magnet displacement detection heads are all made of the same type of magnetic detection elements which operate based on common operation principles. The three magnetic sensing parts and the three acceleration sensing parts are integrated into one modular package together with one electronic circuit for controlling these six magnetic detection elements.Type: ApplicationFiled: June 1, 2006Publication date: March 29, 2007Applicants: AICHI STEEL CORPORATION, Vodafone K.K.Inventors: Yoshinobu Honkura, Michiharu Yamamoto, Masaki Mori, Eiji Kako, Toshiro Matsumura, Jun Yamazaki, Hirohisa Kusuda, Yasuhiro Nishide, Daisuke Tsujino
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Publication number: 20060190174Abstract: An electronic compass and direction finding method includes a geomagnetic direction sensor having two sensor elements for detecting perpendicular components of the Earth's magnetic field vector. A microcomputer is coupled to the geomagnetic direction sensor to compute a heading of a vehicle in software. Even if the electronic compass displays directional errors due to magnetization of the vehicle, a center of an azimuth circle can be immediately corrected by a center calculating means and a relatively accurate heading can be displayed. Later, the center of the azimuth circle can be corrected with a higher accuracy by a least squares calculating means. This frees a vehicle driver from uneasiness due to display of an intelligible direction.Type: ApplicationFiled: February 23, 2006Publication date: August 24, 2006Applicant: AICHI MICRO INTELLIGENT CORPORATIONInventors: Xueping Li, Hitoshi Aoyama, Yoshinobu Honkura, Eiji Kako, Katsuhiko Tsuchida
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Publication number: 20060123906Abstract: An accelerometer for measuring the displacement of a magnet body using magnetic detecting elements is provided, the accelerometer having superior measurement accuracy by suppressing influence of a peripheral magnetic field. The accelerometer has detecting units each having a cantilever which is elastically deformed so as to rotate around a fixed end thereof, a magnet body provided at a free end of the cantilever, and a magnetic detecting head portion disposed outside the rotation region of the cantilever. In order to correct detection signals output from the magnetic detecting head portions, the accelerometer has peripheral magnetic field detecting portions for measuring a peripheral magnetic field acting on the magnetic detecting head portions and the magnet bodies.Type: ApplicationFiled: March 21, 2005Publication date: June 15, 2006Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Michiharu Yamamoto, Yoshiaki Koutani, Masaki Mori, Eiji Kako, Kouei Genba, Takumi Asano, Naoki Ishikawa