Patents by Inventor Yongfu CAI
Yongfu CAI 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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Publication number: 20210325486Abstract: A magnetic sensor includes a first resistor having a first resistance and a first correction resistor having a second resistance. The first resistor and the first correction resistor are connected in series. The first resistor is configured so that the first resistance changes periodically as strength of a magnetic field component changes periodically. The first correction resistor is configured so that a change in a sum of the first resistance and the second resistance due to a noise magnetic field is smaller than a change in the first resistance due to the noise magnetic field.Type: ApplicationFiled: March 16, 2021Publication date: October 21, 2021Applicant: TDK CORPORATIONInventor: Yongfu CAI
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Publication number: 20210318513Abstract: A magnetic sensor includes first to fourth resistors, a power supply port, a ground port, a first output port, and a second output port. The first resistor and the second resistor are located in a first region and connected in series via a first connection point connected to the first output port. The third resistor and the fourth resistor are located in a second region and connected in series via a second connection point connected to the second output port, at least a part of the second region being located at a position different from the first region in a direction parallel to an X direction. The first and second resistors are located between the third and fourth resistors in a direction parallel to a Y direction.Type: ApplicationFiled: March 9, 2021Publication date: October 14, 2021Applicant: TDK CORPORATIONInventors: Yongfu CAI, Hiraku HIRABAYASHI, Tsuyoshi UMEHARA
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Patent number: 11143720Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector is provided at a position where the output magnetic field can be applied. A magnetic shield that blocks an external magnetic field along the second direction, is provided. The magnetic field converter has a shape in which the length in a third direction, which is orthogonal to both the first direction and the second direction, is longer than the length in the second direction, when viewed along the first direction. The magnetic shield is provided at a position overlapping with the magnetic field converter and the magnetic field detector, when viewed along the first direction.Type: GrantFiled: May 19, 2020Date of Patent: October 12, 2021Assignee: TDK CorporationInventors: Yongfu Cai, Yuta Saito
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Patent number: 11131727Abstract: A magnetic sensor device having a spin-valve-type magnetoresistive effect element and capable of stably applying a bias magnetic field on the free layer of the magnetoresistive effect element includes a spin-valve-type magnetoresistive effect element, a substrate on which the magnetoresistive effect element is positioned, a power source that supplies a substantially constant electric current applied on the magnetoresistive effect element, and a magnetic field generator that is connected to the electric current path of the electric current applied on the magnetoresistive effect element in series. The magnetic field generator is provided to be capable of applying a bias magnetic field on at least a portion of the magnetoresistive effect element. The magnetic field generator is close to a portion of the magnetoresistive effect element and is positioned at a different level from the substrate.Type: GrantFiled: September 20, 2019Date of Patent: September 28, 2021Assignee: TDK CorporationInventors: Naoki Ohta, Yongfu Cai
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Patent number: 11125839Abstract: A magnetic sensor capable of reducing noise caused by an interference magnetic field and capable of outputting a highly accurate signal in accordance with changes in a detected magnetic field includes a magnetic detection element, a first magnetic body having a first surface and a second surface, which is opposite to the first surface, and a second magnetic body positioned approximately in the center of the first magnetic body in the short direction on the first surface of the first magnetic body. The magnetic detection element is provided to be opposite to the second magnetic body with the first magnetic body interposed in between and positioned approximately in the center of the first magnetic body in the short direction. The magnetic sensing direction of the magnetic detection element is a direction approximately parallel to the short direction of the first magnetic body and the second magnetic body, and a width W1 of the first magnetic body is larger than a width W2 of the second magnetic body.Type: GrantFiled: October 15, 2019Date of Patent: September 21, 2021Assignee: TDK CorporationInventor: Yongfu Cai
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Publication number: 20210255000Abstract: A position detection device includes a magnetic field generator and a magnetic sensor. The magnetic field generator is configured so that a mode of variation of a direction of a target magnetic field relative to variations in a position of a lens is such that the direction of the target magnetic field varies nonlinearly relative to the variations in the position of the lens. The magnetic sensor is configured so that a mode of variation of a detection signal relative to variations in the direction of the target magnetic field is such that the detection signal varies nonlinearly relative to the variations in the direction of the target magnetic field.Type: ApplicationFiled: December 8, 2020Publication date: August 19, 2021Applicant: TDK CORPORATIONInventor: Yongfu CAI
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Publication number: 20210255001Abstract: A position detection unit includes a magnetic sensor, a first magnetic field generator, and a second magnetic field generator. The first magnetic field generator includes a first magnet and generates a first magnetic field. The first magnet includes a first magnetic material and has a first shape. The second magnetic field generator includes a second magnet, generates a second magnetic field, and is movable along a first direction with respect to the first magnetic field generator and the magnetic sensor. The second magnet includes a second magnetic material and has a second shape. The magnetic sensor generates a detection signal corresponding to the direction of a magnetic field of interest, and detects a positional change of the second magnetic field generator. The magnetic field of interest is a composite of the first magnetic field along a first plane and the second magnetic field along the first plane.Type: ApplicationFiled: January 13, 2021Publication date: August 19, 2021Applicant: TDK CORPORATIONInventor: Yongfu CAI
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Publication number: 20210231755Abstract: A magnetism detection device according to an embodiment of the disclosure includes a sensor section and a resistive section. The sensor section includes a first magnetism detection element. The first magnetism detection element has a first stacked structure and is configured to detect a magnetic field to be detected. The resistive section includes a first resistive element and is coupled to the sensor section. The first resistive element has the first stacked structure.Type: ApplicationFiled: April 12, 2021Publication date: July 29, 2021Applicant: TDK CORPORATIONInventors: Yongfu CAI, Toshihide SUTO
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Publication number: 20210203852Abstract: The position detecting device of the present invention is a device for detecting the position of a movable detection target within a predetermined movable range. The position detecting device comprises: a first magnet (13A) and a second magnet (13B) which are arranged so as to move integrally with the movement of the detection target; a first magnetic detecting circuit (20A) that detects the magnetic field of the first magnet (13A) and a second magnetic detecting circuit (20B) that detects the magnetic field of the second magnet (13B), which are arranged at positions outside the movable range; and a differential amplifier (8) that amplifies the difference between the detection signals of the magnetic field output from the first magnetic detecting circuit (20A) and the second magnetic detecting circuit (20B), and that outputs the amplified difference of the signal as a position detecting signal of the detection target.Type: ApplicationFiled: December 18, 2020Publication date: July 1, 2021Inventors: Yongfu CAI, Hiraku HIRABAYASHI, Shusuke ICHIHASHI
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Patent number: 10996291Abstract: A magnetism detection device according to an embodiment of the disclosure includes a sensor section and a resistive section. The sensor section includes a first magnetism detection element. The first magnetism detection element has a first stacked structure and is configured to detect a magnetic field to be detected. The resistive section includes a first resistive element and is coupled to the sensor section. The first resistive element has the first stacked structure.Type: GrantFiled: March 18, 2019Date of Patent: May 4, 2021Assignee: TDK CORPORATIONInventors: Yongfu Cai, Toshihide Suto
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Publication number: 20210096194Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector is provided at a position where the output magnetic field can be applied. A magnetic shield that blocks an external magnetic field along the second direction. is provided. The magnetic field converter has a shape in which the length in a third direction, which is orthogonal to both the first direction and the second direction, is longer than the length in the second direction, when viewed along the first direction. The magnetic shield is provided at a position overlapping with the magnetic field converter and the magnetic field detector, when viewed along the first direction.Type: ApplicationFiled: May 19, 2020Publication date: April 1, 2021Inventors: Yongfu Cai, Yuta Saito
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Publication number: 20210096196Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector, which is provided at a position where the output magnetic field is applied. A magnetic shield that shields external magnetic fields along a third direction, which is orthogonal to both the first direction and the second direction. When viewed along the first direction, the magnetic field converter has a shape such that the length in the third direction is greatet than the length in the second direction. When viewed along the first direction, the magnetic shield is provided at a position overlapping the magnetic field converter and the magnetic field detector, and the magnetic field transmittance of the external magnetic field is 1-30%.Type: ApplicationFiled: September 28, 2020Publication date: April 1, 2021Inventor: Yongfu CAI
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Publication number: 20200386577Abstract: A position detection device includes a magnet that generates a magnetic field to be detected, and a magnetic sensor. The magnetic sensor detects the magnetic field to be detected and generates a detection value corresponding to the position of the magnet. The magnetic field to be detected has a first direction that changes within a first plane, at a reference position in the first plane. The magnetic sensor includes four MR elements. Each of the MR elements includes a first magnetic layer having first magnetization that can change in direction within a second plane corresponding to the each of the MR elements. The first plane and the second plane intersect at a dihedral angle ? other than 90°. A detection value depends on the direction of the first magnetization.Type: ApplicationFiled: May 19, 2020Publication date: December 10, 2020Applicant: TDK CORPORATIONInventors: Keisuke UCHIDA, Yongfu CAI
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Publication number: 20200386578Abstract: A position detection device includes a magnet that generates a magnetic field to be detected, and a magnetic sensor. The magnetic sensor detects the magnetic field to be detected and generates a detection value corresponding to the position of the magnet. The magnetic sensor includes an MR element and a substrate. The substrate includes a main surface. The magnetic field to be detected received by the MR element has a first direction that changes within a first plane. The MR element includes a magnetic layer having first magnetization that can change in direction within a second plane parallel to the main surface. The first plane and the second plane intersect at a dihedral angle ? other than 90°. A detection value depends on the direction of the first magnetization.Type: ApplicationFiled: May 29, 2020Publication date: December 10, 2020Applicant: TDK CORPORATIONInventors: Yongfu CAI, Hiraku HIRABAYASHI
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Publication number: 20200292636Abstract: A magnetic sensor device having a spin-valve-type magnetoresistive effect element and capable of stably applying a bias magnetic field on the free layer of the magnetoresistive effect element includes a spin-valve-type magnetoresistive effect element, a substrate on which the magnetoresistive effect element is positioned, a power source that supplies a substantially constant electric current applied on the magnetoresistive effect element, and a magnetic field generator that is connected to the electric current path of the electric current applied on the magnetoresistive effect element in series. The magnetic field generator is provided to be capable of applying a bias magnetic field on at least a portion of the magnetoresistive effect element. The magnetic field generator is close to a portion of the magnetoresistive effect element and is positioned at a different level from the substrate.Type: ApplicationFiled: September 20, 2019Publication date: September 17, 2020Inventors: Naoki OHTA, Yongfu CAI
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Publication number: 20200294876Abstract: An electronic device has a function part 3, a first product information part 6 made of metal, a molded resin 11 that covers the function part 3 and the first product information part 6, and a barrier layer 8 interposed between the first product information part 6 and the molded resin 11.Type: ApplicationFiled: March 13, 2019Publication date: September 17, 2020Inventor: Yongfu CAI
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Publication number: 20200286802Abstract: In an assembly in which a space between two elements is filled with a filler containing resin, a configuration that can limit both the size of the assembly and the cost of the fillers is provided. Assembly 10 of stacked elements has: first element 2 having first surface 21; resin layer 61 that is arranged on first surface 21 and that contains a plurality of fillers F; and second element 4 that is arranged on resin layer 61 and that has second surface 41 that is in contact with resin layer 61. In a section that is perpendicular to second surface 41, the average flattening ratio of fillers F2 that are in contact with second surface 41 is larger than the average flattening ratio of fillers F1, F3 that are not in contact with second surface 41. Here, the flattening ratio is a ratio of the maximum length of the filler in a direction parallel to second surface 41 to the maximum thickness of the filler in a direction perpendicular to second surface 41.Type: ApplicationFiled: November 15, 2019Publication date: September 10, 2020Inventors: Yongfu CAI, Shuhei MIYAZAKI
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Publication number: 20200166590Abstract: A magnetic sensor device has a multipolar magnet having a first surface and a second surface, which is opposite to the first surface, in which magnetic poles of differing polarity are arranged alternately to divide the first surface radially into n regions (where n>4), and a magnetic detection part provided to be opposite to the first surface of the multipolar magnet. The multipolar magnet is provided to be capable of relative movement in at least one direction in a plane substantially parallel to the first surface and the second surface. The magnetic detection part outputs a signal corresponding to change in the magnetic field accompanying relative movement of the multipolar magnet, and the geometric centers of the multipolar magnet and the magnetic detection part substantially match in a direction orthogonal to the first surface.Type: ApplicationFiled: September 23, 2019Publication date: May 28, 2020Inventor: Yongfu CAI
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Publication number: 20200158794Abstract: A magnetic sensor capable of reducing noise caused by an interference magnetic field and capable of outputting a highly accurate signal in accordance with changes in a detected magnetic field includes a magnetic detection element, a first magnetic body having a first surface and a second surface, which is opposite to the first surface, and a second magnetic body positioned approximately in the center of the first magnetic body in the short direction on the first surface of the first magnetic body. The magnetic detection element is provided to be opposite to the second magnetic body with the first magnetic body interposed in between and positioned approximately in the center of the first magnetic body in the short direction. The magnetic sensing direction of the magnetic detection element is a direction approximately parallel to the short direction of the first magnetic body and the second magnetic body, and a width W1 of the first magnetic body is larger than a width W2 of the second magnetic body.Type: ApplicationFiled: October 15, 2019Publication date: May 21, 2020Inventor: Yongfu CAI
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Publication number: 20200088507Abstract: A magnetic field generator generates a detection-target magnetic field related to an angle to be detected. An angle sensor includes a first and a second magnetic sensor and a processor. The first magnetic sensor detects, at a first detection position, a first applied magnetic field including the detection-target magnetic field, and generates first detection information having a correspondence with the angle to be detected. The second magnetic sensor detects, at a second detection position, a second applied magnetic field including the detection-target magnetic field, and generates second detection information having a correspondence with the angle to be detected. The processor generates an angle detection value by performing arithmetic processing using the first and second detection information. The ratio of a strength of the detection-target magnetic field at the second detection position to a strength of the detection-target magnetic field at the first detection position is 1.65 or more.Type: ApplicationFiled: July 31, 2019Publication date: March 19, 2020Applicant: TDK CORPORATIONInventors: Yongfu CAI, Hiraku HIRABAYASHI