Patents by Inventor Shigetoshi Fukaya
Shigetoshi Fukaya 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: 6928887Abstract: A first shaft and a second shaft are connected coaxially. A torsion bar converts a torque applied between two shafts into a torsion displacement. A multipolar magnet is fixed to the first shaft. One set of magnetic yokes is fixed to the second shaft and disposed in a magnetic field generated by the multipolar magnet. One set of flux collecting rings is disposed along an outer surface of the set of magnetic yokes and opposed to each other via an air gap in an axial direction. A magnetic sensor is provided for detecting the density of magnetic flux generated in the air gap. An outer cylindrical surface of the set of flux collecting rings is surrounded by a magnetic shield.Type: GrantFiled: September 30, 2003Date of Patent: August 16, 2005Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Naoki Nakane, Shigetoshi Fukaya
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Patent number: 6928888Abstract: A first shaft and a second shaft are connected coaxially. A torsion bar converts a torque applied between two shafts into a torsion displacement. A multipolar magnet is fixed to the first shaft. One set of magnetic yokes is fixed to the second shaft and disposed in a magnetic field generated by the multipolar magnet. The magnetic yokes are opposed to each other via an air gap in an axial direction. A magnetic sensor is provided for detecting the density of magnetic flux generated in the air gap. A non-magnetic spacer is disposed between the magnetic yokes as a means for positioning the magnetic yokes. The spacer and the magnetic yokes are integrated by resin molding.Type: GrantFiled: October 1, 2003Date of Patent: August 16, 2005Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Naoki Nakane, Shigetoshi Fukaya
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Publication number: 20050162157Abstract: A rotation angle detecting device includes a columnar permanent magnet that has a generally ring-shaped cross-section and a pair of magnetic poles, a pair of semi-cylindrical yokes disposed in a circumferential direction opposite the permanent magnet, a rotary shaft fixed to the permanent magnet at a shifted rotation axis and a magnetic sensor disposed in one of circumferential gaps between the yokes. The rotation axis and the magnetic poles are arranged so that the magnetic flux density becomes maximum at portions of the yoke less than 90 degrees angled from the circumferential gap in which the magnetic sensor is disposed.Type: ApplicationFiled: January 28, 2005Publication date: July 28, 2005Inventors: Tsutomu Kamizino, Koji Wato, Masuhiro Taguchi, Shinji Ando, Shigetoshi Fukaya, Kenji Takeda
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Publication number: 20050126309Abstract: A torque sensor is provided which consists of a magnet, an assembly of magnetic rings, and a magnetic sensor. The magnetic rings have claws arrayed thereround at regular intervals. Each of the claws of one of the rings is interposed between adjacent two of the claws of the other ring. Upon input of torque, the magnet is rotated relative to the ring assembly, thereby causing the density of magnetic flux to change as a function of the torque which is sensed by the magnetic sensor. Each of the claws is geometrically shaped so as to increase the density of magnetic flux flowing through the ring assembly, thereby improving the sensitivity of the sensor.Type: ApplicationFiled: February 8, 2005Publication date: June 16, 2005Inventors: Naoki Nakane, Shigetoshi Fukaya
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Publication number: 20050126310Abstract: A pair of magnetic flux collecting rings and a magnetic sensor are integrally covered by a molded resin to form a sub unit of a torque sensor. The pair of rings and sensors are integrated and are in contact with each other, i.e., the magnetic sensor is held in between respective magnetic flux collecting portions of the rings without any air gap formed therebetween. Magnetic flux collected by the rings can be detected by the magnetic sensor to a maximum degree, whereby the signal output of the magnetic sensor is enhanced and made stable.Type: ApplicationFiled: January 27, 2005Publication date: June 16, 2005Inventors: Kiyoshi Sugimura, Naoki Nakane, Shigetoshi Fukaya, Kenji Takeda
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Publication number: 20050109126Abstract: A torsion bar type torque sensor system is provided with the following: an elastic member that receives a torque and converts the torque to a torsion displacement; a multipolar ring magnet in which N poles and S poles are circumferentially and alternately magnetized; a pair of magnetic yoke halves disposed coaxially with the ring magnet; and a magnetometric sensor that detects magnetic flux generated between the pair of the magnetic yoke halves. The magnetometric sensor is made of a semiconductor that integrates a semiconductor magnetometric sensor, a non- volatile memory, a computation circuit, and an output circuit. This structure provides a torque sensor system that has an excellent maintainability.Type: ApplicationFiled: December 16, 2004Publication date: May 26, 2005Inventors: Shigetoshi Fukaya, Kenji Takeda, Naoki Nakane, Kiyoshi Sugimura
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Patent number: 6868743Abstract: A torque sensor is provided which consists of a magnet, an assembly of magnetic rings, and a magnetic sensor. The magnetic rings have claws arrayed thereround at regular intervals. Each of the claws of one of the rings is interposed between adjacent two of the claws of the other ring. Upon input of torque, the magnet is rotated relative to the ring assembly, thereby causing the density of magnetic flux to change as a function of the torque which is sensed by the magnetic sensor. Each of the claws is geometrically shaped so as to increase the density of magnetic flux flowing through the ring assembly, thereby improving the sensitivity of the sensor.Type: GrantFiled: November 13, 2003Date of Patent: March 22, 2005Assignees: Denso Corporation, Nippon Soken Inc.Inventors: Naoki Nakane, Shigetoshi Fukaya
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Patent number: 6868744Abstract: A pair of magnetic flux collecting rings and a magnetic sensor are integrally covered by a molded resin to form a sub unit of a torque sensor. The pair of rings and sensors are integrated and are in contact with each other, i.e., the magnetic sensor is held in between respective magnetic flux collecting portions of the rings without any air gap formed therebetween. Magnetic flux collected by the rings can be detected by the magnetic sensor to a maximum degree, whereby the signal output of the magnetic sensor is enhanced and made stable.Type: GrantFiled: February 27, 2003Date of Patent: March 22, 2005Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Kiyoshi Sugimura, Naoki Nakane, Shigetoshi Fukaya, Kenji Takeda
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Publication number: 20050046418Abstract: An angular position determining apparatus is provided which includes a magnet affixed to a rotary shaft and a plurality of magnetic sensor elements and works to determine an angular position of the rotary shaft using outputs of the magnetic sensor elements. The apparatus also includes a malfunction detector which specifies which of the magnetic sensor elements is now malfunctioning and takes an action required to determine the angular position of the rotary shaft correctly in the event of such a malfunction.Type: ApplicationFiled: August 26, 2004Publication date: March 3, 2005Inventors: Shigetoshi Fukaya, Yoko Ichikawa, Naoki Nakane
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Patent number: 6847902Abstract: A torsion bar type torque sensor system is provided with the following: an elastic member that receives a torque and converts the torque to a torsion displacement; a multipolar ring magnet in which N poles and S poles are circumferentially and alternately magnetized; a pair of magnetic yoke halves disposed coaxially with the ring magnet; and a magnetometric sensor that detects magnetic flux generated between the pair of the magnetic yoke halves. The magnetometric sensor is made of a semiconductor that integrates a semiconductor magnetometric sensor, a non-volatile memory, a computation circuit, and an output circuit. This structure provides a torque sensor system that has an excellent maintainability.Type: GrantFiled: January 31, 2003Date of Patent: January 25, 2005Assignees: Nippon Soken, Inc., DENSO CorporationInventors: Shigetoshi Fukaya, Kenji Takeda, Naoki Nakane, Kiyoshi Sugimura
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Patent number: 6810336Abstract: A torque sensor includes first and second shafts, an elastic shaft, a magnet, a pair of ring plates, and a magnetic sensor. The elastic shaft connects the first and second shafts coaxially. The magnet is fixed to the first shaft. The pair of ring plates is fixed to the second shaft, and faces each other in an axial direction of the elastic shaft so that the pair of ring plates sandwiches the magnet. The magnetic sensor is disposed in a gap between the pair of ring plates so that the magnetic sensor detects a magnetic flux density in the gap. Each ring plate includes a convexity and a concavity in an inner circumference of each ring plate, respectively. The pair of ring plates is rotatable against the magnet in accordance with a twist of the elastic shaft so that the rotation of the ring plates causes the magnetic flux density in the gap.Type: GrantFiled: March 26, 2003Date of Patent: October 26, 2004Assignee: Denso CorporationInventors: Naoki Nakane, Shigetoshi Fukaya, Kenji Takeda
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Publication number: 20040164733Abstract: An angular position sensor is provided which is designed to an angular position of a rotary shaft. The angular position sensor has a magnet affixed to the rotary shaft. The magnet has an N-pole and an S-pole and is so geometrically shaped as to produce magnetic flux which is substantially uniform in amount within a range extending around each of centers of the N-pole and the S-pole. This improves the linearity of a change in sensor output upon rotation of the rotary shaft.Type: ApplicationFiled: January 13, 2004Publication date: August 26, 2004Applicant: DENSO CORPORATION/NIPPON SOKENInventors: Shigetoshi Fukaya, Kenji Takeda, Naoki Nakane, Tetsuo Imamura
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Publication number: 20040093961Abstract: A torque sensor is provided which consists of a magnet, an assembly of magnetic rings, and a magnetic sensor. The magnetic rings have claws arrayed thereround at regular intervals. Each of the claws of one of the rings is interposed between adjacent two of the claws of the other ring. Upon input of torque, the magnet is rotated relative to the ring assembly, thereby causing the-density of magnetic flux to change as a function of the torque which is sensed by the magnetic sensor. Each of the claws is geometrically shaped so as to increase the density of magnetic flux flowing through the ring assembly, thereby improving the sensitivity of the sensor.Type: ApplicationFiled: November 13, 2003Publication date: May 20, 2004Inventors: Naoki Nakane, Shigetoshi Fukaya
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Publication number: 20040074314Abstract: A first shaft and a second shaft are connected coaxially. A torsion bar converts a torque applied between two shafts into a torsion displacement. A multipolar magnet is fixed to the first shaft. One set of magnetic yokes is fixed to the second shaft and disposed in a magnetic field generated by the multipolar magnet. The magnetic yokes are opposed to each other via an air gap in an axial direction. A magnetic sensor is provided for detecting the density of magnetic flux generated in the air gap. A non-magnetic spacer is disposed between the magnetic yokes as a means for positioning the magnetic yokes. The spacer and the magnetic yokes are integrated by resin molding.Type: ApplicationFiled: October 1, 2003Publication date: April 22, 2004Inventors: Naoki Nakane, Shigetoshi Fukaya
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Publication number: 20040074316Abstract: A first shaft and a second shaft are connected coaxially. A torsion bar converts a torque applied between two shafts into a torsion displacement. A multipolar magnet is fixed to the first shaft. One set of magnetic yokes is fixed to the second shaft and disposed in a magnetic field generated by the multipolar magnet. One set of flux collecting rings is disposed along an outer surface of the set of magnetic yokes and opposed to each other via an air gap in an axial direction. A magnetic sensor is provided for detecting the density of magnetic flux generated in the air gap. An outer cylindrical surface of the set of flux collecting rings is surrounded by a magnetic shield.Type: ApplicationFiled: September 30, 2003Publication date: April 22, 2004Inventors: Naoki Nakane, Shigetoshi Fukaya
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Publication number: 20030233889Abstract: A torque sensor includes first and second shafts, an elastic shaft, a magnet, a pair of ring plates, and a magnetic sensor. The elastic shaft connects the first and second shafts coaxially. The magnet is fixed to the first shaft. The pair of ring plates is fixed to the second shaft, and faces each other in an axial direction of the elastic shaft so that the pair of ring plates sandwiches the magnet. The magnetic sensor is disposed in a gap between the pair of ring plates so that the magnetic sensor detects a magnetic flux density in the gap. Each ring plate includes a convexity and a concavity in an inner circumference of each ring plate, respectively. The pair of ring plates is rotatable against the magnet in accordance with a twist of the elastic shaft so that the rotation of the ring plates causes the magnetic flux density in the gap.Type: ApplicationFiled: March 26, 2003Publication date: December 25, 2003Inventors: Naoki Nakane, Shigetoshi Fukaya, Kenji Takeda
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Publication number: 20030209087Abstract: A torque sensor has a torsion bar coaxially in alignment with input and output shafts, a ring shaped magnet fixed to an axial end of the input shaft, a pair of magnetic yokes fixed to an axial end of the output shaft, and a magnetic sensor for detecting magnetic flux density generated between the pair of magnetic yokes. Each of the magnetic yokes is provided with claws, which are circumferentially spaced at constant intervals, and whose number is equal to that of each of N and S poles alternately arranged circumferentially in the magnet. Each center of the claws coincides with a boundary between immediately adjacent N and S poles of the magnet, when the torsion bar is not twisted. The magnetic sensor is inserted into an axial gap between the pair of magnetic yokes without contacting the magnetic yokes.Type: ApplicationFiled: June 9, 2003Publication date: November 13, 2003Inventors: Naoki Nakane, Kiyoshi Sugimura, Shigetoshi Fukaya, Masao Tokunaga, Kenji Takeda
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Publication number: 20030167857Abstract: A pair of magnetic flux collecting rings and a magnetic sensor are integrally covered by a molded resin to form a sub unit of a torque sensor. The pair of rings and sensors are integrated and are in contact with each other, i.e., the magnetic sensor is held in between respective magnetic flux collecting portions of the rings without any air gap formed therebetween. Magnetic flux collected by the rings can be detected by the magnetic sensor to a maximum degree, whereby the signal output of the magnetic sensor is enhanced and made stable.Type: ApplicationFiled: February 27, 2003Publication date: September 11, 2003Inventors: Kiyoshi Sugimura, Naoki Nakane, Shigetoshi Fukaya, Kenji Takeda
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Publication number: 20030155627Abstract: A torsion bar type torque sensor system is provided with the following: an elastic member that receives a torque and converts the torque to a torsion displacement; a multipolar ring magnet in which N poles and S poles are circumferentially and alternately magnetized; a pair of magnetic yoke halves disposed coaxially with the ring magnet; and a magnetometric sensor that detects magnetic flux generated between the pair of the magnetic yoke halves. The magnetometric sensor is made of a semiconductor that integrates a semiconductor magnetometric sensor, a non-volatile memory, a computation circuit, and an output circuit. This structure provides a torque sensor system that has an excellent maintainability.Type: ApplicationFiled: January 31, 2003Publication date: August 21, 2003Inventors: Shigetoshi Fukaya, Kenji Takeda, Naoki Nakane, Kiyoshi Sugimura
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Publication number: 20020189371Abstract: A torque sensor has a torsion bar coaxially in alignment with input and output shafts, a ring shaped magnet fixed to an axial end of the input shaft, a pair of magnetic yokes fixed to an axial end of the output shaft, and a magnetic sensor for detecting magnetic flux density generated between the pair of magnetic yokes. Each of the magnetic yokes is provided with claws, which are circumferentially spaced at constant intervals, and whose number is equal to that of each of N and S poles alternately arranged circumferentially in the magnet. Each center of the claws coincides with a boundary between immediately adjacent N and S poles of the magnet, when the torsion bar is not twisted. The magnetic sensor is inserted into an axial gap between the pair of magnetic yokes without contacting the magnetic yokes.Type: ApplicationFiled: May 20, 2002Publication date: December 19, 2002Inventors: Naoki Nakane, Kiyoshi Sugimura, Shigetoshi Fukaya, Masao Tokunaga, Kenji Takeda