Patents by Inventor Jeffrey Eagen
Jeffrey Eagen 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: 11782103Abstract: In one aspect, a dual double-pinned spin valve element includes a first spin valve that includes a first pinned layer and a second pinned layer and a second spin valve disposed on the first spin valve and comprising a third pinned layer and a fourth pinned layer. The first, second, third and fourth pinned layers each have a magnetization in a first direction.Type: GrantFiled: June 12, 2020Date of Patent: October 10, 2023Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Paolo Campiglio, Noémie Belin, Damien Dehu, Jeffrey Eagen
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Publication number: 20230236268Abstract: According to an embodiment, a magnetic field sensor includes: one or more magnetic field sensing elements; and a magnet structure to provide a bias magnetic field about the one or more magnetic field sensing elements, the magnet structure includes alternating magnetic layers and non-magnetic layers with at least three magnetic layers.Type: ApplicationFiled: January 21, 2022Publication date: July 27, 2023Applicant: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Damien Dehu
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Patent number: 11686599Abstract: Methods and apparatus that can include a rotatable target to generate a sinusoidal signal in a magnetic field sensor, wherein the target includes a plurality of sinusoidal teeth to reduce angular error. A magnetic field sensor can be configured to determine a position of the target. In embodiments, a rotatable target to generate a sinusoidal signal in a magnetic field sensor can include a plurality of sinusoidal teeth and a number of harmonics to reduce angular error.Type: GrantFiled: January 7, 2022Date of Patent: June 27, 2023Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Damien Dehu, Paul A. David, Andrea Foletto, Maxime Rioult
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Publication number: 20220128379Abstract: Methods and apparatus that can include a rotatable target to generate a sinusoidal signal in a magnetic field sensor, wherein the target includes a plurality of sinusoidal teeth to reduce angular error. A magnetic field sensor can be configured to determine a position of the target. In embodiments, a rotatable target to generate a sinusoidal signal in a magnetic field sensor can include a plurality of sinusoidal teeth and a number of harmonics to reduce angular error.Type: ApplicationFiled: January 7, 2022Publication date: April 28, 2022Applicant: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Damien Dehu, Paul A. David, Andrea Foletto, Maxime Rioult
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Patent number: 11255700Abstract: Methods and apparatus for a magnetic field sensor for measuring movement of a target including a substrate and a magnet. A first bridge structure has first and second pluralities of magnetic field sensing elements spaced from each other. An axis of sensitivity of the magnetic field sensing elements is rotated at a predetermined angle with respect to an axis of rotation of the target to generate an output signal corresponding to the position of the target and a change in a property of the magnetic field generated by the magnet.Type: GrantFiled: July 31, 2019Date of Patent: February 22, 2022Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Damien Dehu, Paul A. David, Andrea Foletto, Maxime Rioult
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Patent number: 11215681Abstract: A system includes a ring magnet having magnetic segments and configured to rotate about an axis of rotation, wherein adjacent segments have different magnetic polarities, The system can further include a substrate positioned so that a top surface of the substrate is substantially parallel to the axis of rotation and a center plane passing through the ring magnet and perpendicular to the axis of rotation of the ring magnet intersects the top surface at an intersection line. The system can further include four magnetic field sensing elements supported by the substrate and electrically coupled to form a first bridge circuit, wherein two of the four magnetic field sensing elements are positioned on one side of the intersection line and the other two of the four magnetic field sensing elements are positioned on the other side of the intersection line.Type: GrantFiled: July 10, 2019Date of Patent: January 4, 2022Assignee: Allegro MicroSystems, LLCInventors: Paul A. David, Remy Lassalle-Balier, Jeffrey Eagen, Damien Dehu
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Publication number: 20210389393Abstract: In one aspect, a dual double-pinned spin valve element includes a first spin valve that includes a first pinned layer and a second pinned layer and a second spin valve disposed on the first spin valve and comprising a third pinned layer and a fourth pinned layer. The first, second, third and fourth pinned layers each have a magnetization in a first direction.Type: ApplicationFiled: June 12, 2020Publication date: December 16, 2021Applicant: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Paolo Campiglio, Noémie Belin, Damien Dehu, Jeffrey Eagen
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Patent number: 11169221Abstract: A magnetic field sensor is provided, including a substrate, a first bridge circuit formed on the substrate, the first bridge circuit being arranged to generate a first signal indicative of a motion of a target, and a second bridge circuit formed on the substrate, the second bridge circuit being arranged to generate a second signal indicative of whether the magnetic field sensor is aligned with the target.Type: GrantFiled: February 26, 2020Date of Patent: November 9, 2021Assignee: Allegro MicroSystems, LLCInventor: Jeffrey Eagen
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Publication number: 20210263114Abstract: A magnetic field sensor is provided, including a substrate, a first bridge circuit formed on the substrate, the first bridge circuit being arranged to generate a first signal indicative of a motion of a target, and a second bridge circuit formed on the substrate, the second bridge circuit being arranged to generate a second signal indicative of whether the magnetic field sensor is aligned with the target.Type: ApplicationFiled: February 26, 2020Publication date: August 26, 2021Applicant: Allegro MicroSystems, LLCInventor: Jeffrey Eagen
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Patent number: 11022661Abstract: A magnetoresistance (MR) element includes a first stack portion comprising a first plurality of layers including a first spacer layer having a first thickness and a first material selected to result in the first stack portion having a first sensitivity to the applied magnetic field. The MR element also has a second stack portion comprising a second plurality of layers, including a second spacer layer having a second thickness to result in the second stack portion having a second sensitivity to the applied magnetic field. The first thickness may be different than the second thickness resulting in the first sensitivity being different than the second sensitivity.Type: GrantFiled: May 29, 2018Date of Patent: June 1, 2021Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Paolo Campiglio
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Patent number: 11002807Abstract: A magnetoresistance element deposited upon a substrate includes a first stack portion having opposing first and second surfaces and including a first plurality of layers. The first stack portion has a first substantially linear response corresponding to an applied magnetic field over a first magnetic field strength range. The magnetoresistance element also includes a second stack portion having opposing first and second surfaces and including a second plurality of layers. The first surface of the second stack portion is disposed over the second surface of the first stack portion and the second stack portion has a second substantially linear response that is different than the first substantially linear response. The second substantially linear response corresponds to the applied magnetic field over a second magnetic field strength range.Type: GrantFiled: March 2, 2020Date of Patent: May 11, 2021Assignee: Allegro MicroSystems, LLCInventors: Paolo Campiglio, Jeffrey Eagen
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Patent number: 10921373Abstract: A method of determining an error condition in a magnetic field sensor can include receiving a first bridge signal, the first bridge signal generated by a first full bridge circuit. The method can also include receiving a second bridge signal, the second bridge signal generated by a second full bridge circuit. The method can also include determining a bridge separation from the first bridge signal and the second bridge signal. The method can also include comparing a function of the bridge separation to a threshold value. The method can also include generating an error signal indicative of the error condition or not indicative of the error condition in response to the comparing.Type: GrantFiled: November 29, 2017Date of Patent: February 16, 2021Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Paul A. David
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Publication number: 20210011097Abstract: A system includes a ring magnet having magnetic segments and configured to rotate about an axis of rotation, wherein adjacent segments have different magnetic polarities, The system can further include a substrate positioned so that a top surface of the substrate is substantially parallel to the axis of rotation and a center plane passing through the ring magnet and perpendicular to the axis of rotation of the ring magnet intersects the top surface at an intersection line. The system can further include four magnetic field sensing elements supported by the substrate and electrically coupled to form a first bridge circuit, wherein two of the four magnetic field sensing elements are positioned on one side of the intersection line and the other two of the four magnetic field sensing elements are positioned on the other side of the intersection line.Type: ApplicationFiled: July 10, 2019Publication date: January 14, 2021Applicant: Allegro Microsystems, LLCInventors: Paul A. David, Remy Lassalle-Balier, Jeffrey Eagen, Damien Dehu
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Patent number: 10866287Abstract: A magnetic field sensor can include four magnetoresistance elements arranged in a bridge, wherein two of the magnetoresistance elements have a response to an external or stray magnetic field that is opposite to a response of the other two magnetoresistance elements.Type: GrantFiled: July 10, 2019Date of Patent: December 15, 2020Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Damien Dehu
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Patent number: 10837753Abstract: Methods and apparatus for s sensor having magnetic field sensing elements coupled in a differential bridge and a signal processor configured to receive signals from the bridge to determine a distance from the magnetic field sensing elements to a magnet from flux line divergence of magnetic flux generated by the magnet.Type: GrantFiled: January 10, 2019Date of Patent: November 17, 2020Assignee: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Andrea Foletto, Paul A. David
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Patent number: 10823586Abstract: A magnetic field sensor for sensing a movement of a target object an include a substrate having a major planar surface and three or more magnetic field sensing elements disposed upon the major planar surface of the substrate. The three or more magnetic field sensing elements can have respective major response axes, each major response axis parallel to the major planar surface of the substrate. The three or more magnetic field sensing elements comprise first and third magnetic field sensing elements and a second magnetic field sensing element disposed between the first and third magnetic field sensing elements. A first spacing between the first and second magnetic field sensing elements is less than a second spacing between the second and third magnetic field sensing elements. No other magnetic field sensing elements are disposed between the first and third magnetoresistance elements.Type: GrantFiled: December 26, 2018Date of Patent: November 3, 2020Assignee: Allegro MicroSystems, LLCInventors: Jeffrey Eagen, Paul A. David
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Patent number: 10809094Abstract: Methods and apparatus for a sensor system having a first magnetic field sensing element with first and second segments where the first and second segments are located at positions to generate magnetic field bias in opposite directions for reducing sensitivity due to misalignment of the first and second segments. A processing module is configured to receive an output of the magnetic field sensing element.Type: GrantFiled: January 30, 2018Date of Patent: October 20, 2020Assignee: Allegro MicroSystems, LLCInventors: Andrea Foletto, Rémy Lassalle-Balier, Yannick Vuillermet, Paul A. David, Jeffrey Eagen
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Publication number: 20200225020Abstract: Methods and apparatus for s sensor having magnetic field sensing elements coupled in a differential bridge and a signal processor configured to receive signals from the bridge to determine a distance from the magnetic field sensing elements to a magnet from flux line divergence of magnetic flux generated by the magnet.Type: ApplicationFiled: January 10, 2019Publication date: July 16, 2020Applicant: Allegro MicroSystems, LLCInventors: Rémy Lassalle-Balier, Jeffrey Eagen, Andrea Foletto, Paul A. David
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Publication number: 20200209017Abstract: A magnetic field sensor for sensing a movement of a target object an include a substrate having a major planar surface and three or more magnetic field sensing elements disposed upon the major planar surface of the substrate. The three or more magnetic field sensing elements can have respective major response axes, each major response axis parallel to the major planar surface of the substrate. The three or more magnetic field sensing elements comprise first and third magnetic field sensing elements and a second magnetic field sensing element disposed between the first and third magnetic field sensing elements. A first spacing between the first and second magnetic field sensing elements is less than a second spacing between the second and third magnetic field sensing elements. No other magnetic field sensing elements are disposed between the first and third magnetoresistance elements.Type: ApplicationFiled: December 26, 2018Publication date: July 2, 2020Applicant: Allegro MicroSystems, LLCInventors: Jeffrey Eagen, Paul A. David
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Publication number: 20200200840Abstract: A magnetoresistance element deposited upon a substrate includes a first stack portion having opposing first and second surfaces and including a first plurality of layers. The first stack portion has a first substantially linear response corresponding to an applied magnetic field over a first magnetic field strength range. The magnetoresistance element also includes a second stack portion having opposing first and second surfaces and including a second plurality of layers. The first surface of the second stack portion is disposed over the second surface of the first stack portion and the second stack portion has a second substantially linear response that is different than the first substantially linear response. The second substantially linear response corresponds to the applied magnetic field over a second magnetic field strength range.Type: ApplicationFiled: March 2, 2020Publication date: June 25, 2020Applicant: Allegro MicroSystems, LLCInventors: Paolo Campiglio, Jeffrey Eagen