Patents by Inventor Tamon Kasajima
Tamon Kasajima 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: 20250116735Abstract: To reduce the influence of disturbance noise in a magnetic sensor provided with an external magnetic body around which a compensation coil is wound. A magnetic sensor includes an external magnetic body that collects a magnetic field to be detected in a magnetosensitive element and a compensation coil. The compensation coil includes a solenoid part wound around the external magnetic body and lead-out parts C1 and C2 that connect both ends of the solenoid part respectively to connection pins P1 and P2. The lead-out part C2 passes through the inner diameter area of the solenoid part to be connected to the connection pin P2. This makes the second lead-out part unlikely to act as an antenna, which can reduce the influence of disturbance noise.Type: ApplicationFiled: January 31, 2022Publication date: April 10, 2025Inventors: Tamon KASAJIMA, Makoto KAMENO, Osamu HARAKAWA
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Publication number: 20250052837Abstract: Disclosed herein is a magnetic field detection device that includes a support having first, second, and third cutouts; and first, second, and third magnetic sensors accommodated in the first, second, and third cutouts, respectively. The support has first and second surfaces extending in first and second directions, third and fourth surfaces extending in the first and third directions, and fifth and sixth surfaces extending in the second and third directions. The first cutout is formed in at least one of the first and fourth surfaces, the second cutout is formed in at least one of the second and fifth surfaces, and the third cutout is formed in at least one of the third and sixth surfaces. Magnetic sensing directions of the first, second, and third magnetic sensors are the first, second, and third directions, respectively.Type: ApplicationFiled: August 2, 2024Publication date: February 13, 2025Inventors: Yuichiro YAMAJI, Tamon Kasajima, Masafumi Kami, Osamu Harakawa
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Patent number: 12188997Abstract: To facilitate a change in the number and layout of magnetic field detection devices to be arranged in an array. A magnetic field detection device includes a cancel coil wound around a bobbin, a cover member fixed to the bobbin and covering the cancel coil in a direction perpendicular to the axial direction of the cancel coil, and magnetic sensors fixed to the bobbin or cover member. The cover member has side surfaces and extending in the z-direction and positioned on mutually opposite sides. The side surfaces have first and second engagement portions, respectively, and the first engagement portion has a shape engageable with the shape of the second engagement portion. This makes it possible to arrange a desired number of the magnetic field detection devices.Type: GrantFiled: May 27, 2021Date of Patent: January 7, 2025Assignee: TDK CORPORATIONInventors: Makoto Kameno, Taiju Akushichi, Takato Fukui, Yuichiro Yamaji, Osamu Harakawa, Tamon Kasajima
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Patent number: 12117506Abstract: To reduce the number of components and simplify the circuit configuration in a magnetic field detection device capable of detecting a weak magnetic field without using a shield room. A magnetic field detection device includes a cancel coil wound around a winding core part of a bobbin, magnetic sensors fixed to mutually different positions of the bobbin, and a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal from the magnetic sensor to cancel the environmental magnetic field in a cancel space. Since the cancel coil is used in common for the magnetic sensors, it is possible to reduce the number of components to be used and to simplify the circuit configuration.Type: GrantFiled: May 10, 2021Date of Patent: October 15, 2024Assignee: TDK CorporationInventors: Takato Fukui, Tamon Kasajima, Yuichiro Yamaji, Taiju Akushichi, Osamu Harakawa, Makoto Kameno
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Patent number: 12105164Abstract: Disclosed herein is a magnetic sensor that includes a first magnetic field sensor that detects an environmental magnetic field to generate a first magnetic field signal, a second magnetic field sensor that detects a detection target magnetic field to generate a second magnetic field signal, a first filter that removes an AC component in a predetermined frequency band from the first magnetic field signal to extract a DC component, a first compensation coil that applies a first cancelling magnetic field to the second magnetic field sensor based on the DC component, a second compensation coil that applies a second cancelling magnetic field to the second magnetic field sensor based on the second magnetic field signal, and a second filter that removes an AC component in at least a predetermined frequency band from the second magnetic field signal.Type: GrantFiled: October 14, 2022Date of Patent: October 1, 2024Assignee: TDK CorporationInventors: Yuichiro Yamaji, Tamon Kasajima, Taiju Akushichi
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Patent number: 12066506Abstract: To provide a small-sized magnetic sensor capable of achieving closed-loop control. A magnetic sensor includes: a sensor chip mounted on a surface of a substrate such that an element formation surface is perpendicular to the surface of the substrate or inclined by a predetermined angle with respect thereto; an external magnetic member mounted on the surface of the substrate and collecting a magnetic field to be detected in a magnetosensitive element; and a compensating coil wound around the external magnetic member. The compensating coil is thus wound around the external magnetic member, so that it is possible to cancel a magnetic field to be applied to the magnetosensitive element and to prevent the external magnetic member from being magnetically saturated.Type: GrantFiled: July 30, 2020Date of Patent: August 20, 2024Assignee: TDK CORPORATIONInventors: Taiju Akushichi, Makoto Kameno, Tamon Kasajima
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Publication number: 20240248156Abstract: A magnetic field measurement device includes: an excitation coil that applies an excitation AC magnetic field to an object to be measured including a magnetic material to make a magnetization change of the magnetic material exhibit linear response; a detection coil that detects a primary detection magnetic field caused due to the magnetization change of the magnetic material to generate a primary detection signal; a magnetic field generation coil that generates a secondary detection magnetic field based on the primary detection signal; and a magnetic sensor that detects the secondary detection magnetic field to generate a secondary detection signal including a non-sine wave component. With this configuration, it is possible to obtain the secondary detection signal including a non-sine wave component without making the magnetization change of the magnetic material exhibit nonlinear response, allowing reduction in the current value and frequency of a current flowing in the excitation coil.Type: ApplicationFiled: May 31, 2022Publication date: July 25, 2024Inventors: Tamon KASAJIMA, Shuichi OKAWA, Masanori KOSUDA, Yasushi TAKEMURA, Bagus Trisnanto Suko
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Publication number: 20240151785Abstract: To provide a magnetic sensor capable of detecting a weak magnetic field at a position situated apart from a magnetic field source. A magnetic sensor includes magnetic bodies whose magnetic collecting surfaces face mutually opposite sides and a magnetic detecting part 30 that detects magnetic flux passing between the magnetic bodies. With this configuration, magnetic flux collected from one magnetic collecting surface of one magnetic body passes to another magnetic collecting surface of another magnetic body through the magnetic detecting part, thereby making it possible to efficiently collect a magnetic field spreading in a space. Thus, even when a distance from a magnetic field source is large, magnetic collection can be achieved with high uniformity of a magnetic field.Type: ApplicationFiled: February 24, 2022Publication date: May 9, 2024Inventors: Taiju AKUSHICHI, Tamon KASAJIMA
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Publication number: 20230204686Abstract: To reduce the number of components and simplify the circuit configuration in a magnetic field detection device capable of detecting a weak magnetic field without using a shield room. A magnetic field detection device includes a cancel coil wound around a winding core part of a bobbin, magnetic sensors fixed to mutually different positions of the bobbin, and a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal from the magnetic sensor to cancel the environmental magnetic field in a cancel space. Since the cancel coil is used in common for the magnetic sensors, it is possible to reduce the number of components to be used and to simplify the circuit configuration.Type: ApplicationFiled: May 10, 2021Publication date: June 29, 2023Inventors: Takato FUKUI, Tamon KASAJIMA, Yuichiro YAMAJI, Taiju AKUSHICHI, Osamu HARAKAWA, Makoto KAMENO
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Publication number: 20230176145Abstract: To facilitate a change in the number and layout of magnetic field detection devices to be arranged in an array. A magnetic field detection device includes a cancel coil wound around a bobbin, a cover member fixed to the bobbin and covering the cancel coil in a direction perpendicular to the axial direction of the cancel coil, and magnetic sensors fixed to the bobbin or cover member. The cover member has side surfaces and extending in the z-direction and positioned on mutually opposite sides. The side surfaces have first and second engagement portions, respectively, and the first engagement portion has a shape engageable with the shape of the second engagement portion. This makes it possible to arrange a desired number of the magnetic field detection devices.Type: ApplicationFiled: May 27, 2021Publication date: June 8, 2023Inventors: Makoto KAMENO, Taiju AKUSHICHI, Takato FUKUI, Yuichiro YAMAJI, Osamu HARAKAWA, Tamon KASAJIMA
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Publication number: 20230118663Abstract: Disclosed herein is a magnetic sensor that includes a first magnetic field sensor that detects an environmental magnetic field to generate a first magnetic field signal, a second magnetic field sensor that detects a detection target magnetic field to generate a second magnetic field signal, a first filter that removes an AC component in a predetermined frequency band from the first magnetic field signal to extract a DC component, a first compensation coil that applies a first cancelling magnetic field to the second magnetic field sensor based on the DC component, a second compensation coil that applies a second cancelling magnetic field to the second magnetic field sensor based on the second magnetic field signal, and a second filter that removes an AC component in at least a predetermined frequency band from the second magnetic field signal.Type: ApplicationFiled: October 14, 2022Publication date: April 20, 2023Inventors: Yuichiro YAMAJI, Tamon KASAJIMA, Taiju AKUSHICHI
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Publication number: 20220349960Abstract: To provide a small-sized magnetic sensor capable of achieving closed-loop control. A magnetic sensor includes: a sensor chip mounted on a surface of a substrate such that an element formation surface is perpendicular to the surface of the substrate or inclined by a predetermined angle with respect thereto; an external magnetic member mounted on the surface of the substrate and collecting a magnetic field to be detected in a magnetosensitive element; and a compensating coil wound around the external magnetic member. The compensating coil is thus wound around the external magnetic member, so that it is possible to cancel a magnetic field to be applied to the magnetosensitive element and to prevent the external magnetic member from being magnetically saturated.Type: ApplicationFiled: July 30, 2020Publication date: November 3, 2022Inventors: Taiju AKUSHICHI, Makoto KAMENO, Tamon KASAJIMA
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Patent number: 10905011Abstract: A state detecting device which can be applied even in a severe environment. The state detecting device includes a chargeable all-solid-state battery, a piezoelectric element which supplies charging power to the all-solid-state battery, and an integrated circuit including various sensors which operate with electric power supplied from the all-solid-state battery. The all-solid-state battery, the piezoelectric element, and the integrated circuit are mounted on one surface of a flexible substrate. The flexible substrate is attached to a flexible object which is either an object to be measured or constitutes at least part of an inner surface of a space to be measured.Type: GrantFiled: March 16, 2018Date of Patent: January 26, 2021Assignee: TDK CorporationInventors: Masafumi Kami, Hiroshi Kobayashi, Tamon Kasajima
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Publication number: 20200100363Abstract: A state detecting device which can be applied even in a severe environment. The state detecting device includes a chargeable all-solid-state battery, a piezoelectric element which supplies charging power to the all-solid-state battery, and an integrated circuit including various sensors which operate with electric power supplied from the all-solid-state battery. The all-solid-state battery, the piezoelectric element, and the integrated circuit are mounted on one surface of a flexible substrate. The flexible substrate is attached to a flexible object which is either an object to be measured or constitutes at least part of an inner surface of a space to be measured.Type: ApplicationFiled: March 16, 2018Publication date: March 26, 2020Inventors: Masafumi KAMI, Hiroshi KOBAYASHI, Tamon KASAJIMA
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Publication number: 20190113544Abstract: Disclosed herein is a magnetic sensor that includes a saturable magnetic member that receives magnetic flux flowing in a first axis direction, and a detection coil wound around the saturable magnetic member and having a coil axis aligned with a predetermine direction different from the first axis direction.Type: ApplicationFiled: October 5, 2018Publication date: April 18, 2019Applicant: TDK CORPORATIONInventors: Takashi Osada, Takahiro Hamamura, Tamon Kasajima
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Patent number: 10101413Abstract: A magnetic field detection device includes: a first magnetic field generating part, including a first magnetic field generating conductor; a first magnetic field detection part, including a first magnetic field detection element and a first differential operation part, wherein a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part, and a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field; a second magnetic field generating part, including a second magnetic field generating conductor, in which a second current corresponding to the first feedback current flows; and a second magnetic field detection part, including a second magnetic field detection element.Type: GrantFiled: October 30, 2014Date of Patent: October 16, 2018Assignee: TDK CORPORATIONInventors: Tamon Kasajima, Kei Tanabe, Akihiro Ogawa
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Patent number: 9983273Abstract: A magnetic field detecting sensor includes a bridge circuit which is connected to multiple magnetoresistive effect elements and is capable of outputting a differential voltage between specified connection points, a magnetic field generating conductor for providing the magnetoresistive effect elements with a magnetic field in a direction opposite to that of the detection magnetic field by disposing a magnetic body near the center of the bridge circuit, a differential operation circuit which the differential voltage is input in and makes a feedback current flow to the magnetic field generating conductor, wherein the feedback current generates the magnetic field in a direction opposite to that of the detection magnetic field in the magnetic field generating conductor, and a voltage converting circuit for outputting the feedback current as a voltage value. The magnetic field generating conductor and the magnetoresistive effect elements are formed in the same stacked body.Type: GrantFiled: May 14, 2015Date of Patent: May 29, 2018Assignee: TDK CORPORATIONInventors: Akihiro Ogawa, Tamon Kasajima, Kei Tanabe
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Publication number: 20150331072Abstract: A magnetic field detecting sensor includes a bridge circuit which is connected to multiple magnetoresistive effect elements and is capable of outputting a differential voltage between specified connection points, a magnetic field generating conductor for providing the magnetoresistive effect elements with a magnetic field in a direction opposite to that of the detection magnetic field by disposing a magnetic body near the center of the bridge circuit, a differential operation circuit which the differential voltage is input in and makes a feedback current flow to the magnetic field generating conductor, wherein the feedback current generates the magnetic field in a direction opposite to that of the detection magnetic field in the magnetic field generating conductor, and a voltage converting circuit for outputting the feedback current as a voltage value. The magnetic field generating conductor and the magnetoresistive effect elements are formed in the same stacked body.Type: ApplicationFiled: May 14, 2015Publication date: November 19, 2015Inventors: Akihiro OGAWA, Tamon KASAJIMA, Kei TANABE
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Publication number: 20150115938Abstract: A magnetic field detection device includes: a first magnetic field generating part, including a first magnetic field generating conductor; a first magnetic field detection part, including a first magnetic field detection element and a first differential operation part, wherein a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part, and a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field; a second magnetic field generating part, including a second magnetic field generating conductor, in which a second current corresponding to the first feedback current flows; and a second magnetic field detection part, including a second magnetic field detection element.Type: ApplicationFiled: October 30, 2014Publication date: April 30, 2015Inventors: Tamon KASAJIMA, Kei TANABE, Akihiro OGAWA
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Patent number: 8836317Abstract: A current sensor includes, a current-measured wiring including parallel wiring sections in which portions of the same wiring are arranged in parallel such that electric current to be measured flows therein in opposite directions each other; a magnetism detection unit which is arranged between parallel wirings located in the parallel wiring sections and detects a magnetic field in a direction perpendicular to a plane formed by the parallel wirings; a current detection unit which detects electric current flowing in the current-measured wiring, based on the magnetic field detected by the magnetism detection unit; and a magnetic core surrounding the parallel wiring sections so as to intensify the magnetic field generated around the parallel wirings located in the parallel wiring sections when electric current flows in the wirings.Type: GrantFiled: May 4, 2010Date of Patent: September 16, 2014Assignee: SAE Magnetics (H.K.) Ltd.Inventor: Tamon Kasajima