# US 2013/0154634 A1 · Magnetic sensor device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154634 A1 - Document ID: US20130154634A1 - Status: Published application - Kind: A1 - Application number: 13/719,855 - Filed: 2012-12-19 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Nidec Sankyo Corporation - Inventors: Shogo MOMOSE - Web page: https://patentgrep.com/patent/US20130154634A1 ## CPC - G01R 33/0052: {Manufacturing aspects; Manufacturing of single devices, i.e. of semiconductor magnetic sensor chips (devices based on galvano-magnetic effect or the like H10N50/85)} - G01R 33/0094: {Sensor arrays} - G01R 33/072: {Constructional adaptation of the sensor to specific applications} - G01R 33/10: Plotting field distribution {; Measuring field distribution} - G07D 7/04: Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint (G07D7/01 takes precedence) - G11B 5/00804: {magnetic sheets (rotating sheets G11B5/012)} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G07D: HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A magnetic sensor device may include a magnetic sensor element structured to detect a magnetic property of a medium. The magnetic sensor element may include a sensor core having a body part and one or a plurality of protruded part(s) which is protruded from the body part, an exciting coil which is wound around the sensor core, and a detection coil which is wound around the sensor core. The body part and the protruded part of the sensor core forms an open magnetic path, and a stepped part is formed on a side face of at least one piece of the protruded part. ## Claims ### Claim 1 A magnetic sensor device comprising a magnetic sensor element structured to detect a magnetic property of a medium, wherein the magnetic sensor element comprises: a sensor core having a body part and one or a plurality of protruded part(s) which is protruded from the body part; an exciting coil which is wound around the sensor core; and a detection coil which is wound around the sensor core, the body part and the protruded part of the sensor core forms an open magnetic path, and a stepped part is formed on a side face of at least one piece of the protruded part. ### Claim 2 (depends on 1) The magnetic sensor device according to claim 1, wherein a tip end face of the protruded part where the stepped part is formed is a sensing face of the magnetic sensor element. ### Claim 3 (depends on 2) The magnetic sensor device according to claim 2, wherein a portion on a tip end side of the protruded part with respect to the stepped part is formed so that a width dimension in a direction perpendicular to a protruding direction of the protruded part from the body part is thinner than the width dimension of a portion on a body part side of the protruded part with respect to the stepped part. ### Claim 4 (depends on 3) The magnetic sensor device according to claim 3, wherein the exciting coil is wound around the body part, and the detection coil is wound around the portion on the tip end side of the protruded part with respect to the stepped part, the portion on the tip end side of the protruded part being extended in a straight line shape. ### Claim 5 (depends on 4) The magnetic sensor device according to claim 4, wherein the tip end face of the protruded part is a grinding worked face which is formed by grinding a sensor core substrate. ### Claim 6 (depends on 3) The magnetic sensor device according to claim 3, wherein the protruded part where the stepped part is formed comprises: lower side face portions which structure both side faces in a widthwise direction of a root part which is disposed on the body part side of the protruded part; stepped face portions as the stepped part which are extended upward from upper ends of the lower side face portions while curved to inner sides in the widthwise direction of the protruded part; and side face tip end portions which are extended from upper ends of the stepped face portions in a straight line shape to the tip end face of the protruded part; and the width dimension between the side face tip end portions is thinner than the width dimension between the lower side face portions. ### Claim 7 (depends on 6) The magnetic sensor device according to claim 6, wherein the exciting coil is wound around the body part on both sides of the root part having the lower side face portions which is the body part side of the protruded part, and the detection coil is wound around the side face tip end portions of the protruded part. ### Claim 8 (depends on 7) The magnetic sensor device according to claim 7, wherein the magnetic sensor element comprises a core body having a three layer structure which is comprised of a first and a second protection plates made of nonmagnetic material and the sensor core which is sandwiched by the first and the second protection plates, and the exciting coil and the detection coil are respectively wound around the core body through a coil bobbin. ### Claim 9 (depends on 2) The magnetic sensor device according to claim 2, wherein the sensor core is provided with a plurality of the protruded parts which are protruded to the same side from the body part, at least one of side faces facing each other of the two protruded parts adjacent to each other is formed with the stepped part, and a width of a gap between the side faces facing each other at a position on a tip end side with respect to the stepped part is wider than its width at a position on a body part side with respect to the stepped part. ### Claim 10 (depends on 9) The magnetic sensor device according to claim 9, wherein the protruded part comprises a center protruded part and a first protruded part and a second protruded part which are disposed on both sides with respect to the center protruded part, the center protruded part, the first protruded part and the second protruded part are protruded in the same direction from the body part and are extended in a straight shape so as to be parallel to each other, a width dimension in a direction, which is perpendicular to a protruding direction from the body part, of a portion extended in a straight shape of the center protruded part on a tip end side with respect to the stepped part is thinner than a portion extended in a straight shape of the center protruded part on a body part side with respect to the stepped part. ### Claim 11 (depends on 10) The magnetic sensor device according to claim 10, wherein the exciting coil is wound around the body part, and the detection coil is wound around a portion extended in a straight shape on a tip end side of the center protruded part with respect to the stepped part. ### Claim 12 (depends on 11) The magnetic sensor device according to claim 11, wherein the magnetic sensor element comprises a core body having a three layer structure which is comprised of a first and a second protection plates made of nonmagnetic material and the sensor core which is sandwiched by the first and the second protection plates, and the exciting coil and the detection coil are respectively wound around the core body through a coil bobbin. ### Claim 13 (depends on 10) The magnetic sensor device according to claim 10, wherein the center protruded part comprises: lower side face portions which structure both side faces in a widthwise direction of a root part which is disposed on the body part side; stepped face portions as the stepped part which are extended upward from upper ends of the lower side face portions while curved to inner sides in the widthwise direction of the protruded part; and side face tip end portions which are extended from upper ends of the stepped face portions in a straight line shape to the tip end face of the center protruded part; and the width dimension between the side face tip end portions is thinner than the width dimension between the lower side face portions. ### Claim 14 (depends on 13) The magnetic sensor device according to claim 13, wherein the exciting coil is wound around the body part, and the detection coil is wound around the side face tip end portions of the center protruded part. ### Claim 15 (depends on 1) The magnetic sensor device according to claim 1, wherein a tip end face of the protruded part where the stepped part is formed is a grounding face for being contacted with an electrical conduction member for grounding. ### Claim 16 (depends on 15) The magnetic sensor device according to claim 15, wherein the protruded part where the stepped part is formed is protruded from the body part to a side opposite to a sensing face of the magnetic sensor element. ### Claim 17 (depends on 16) The magnetic sensor device according to claim 16, wherein the tip end face of the protruded part is a cutting worked face which is formed by cutting a sensor core substrate. ### Claim 18 (depends on 1) The magnetic sensor device according to claim 1, wherein the protruded part is protruded from one of edges of the body part, another protruded part is protruded from the other of the edges of the body part to an opposite direction, a tip end face of the protruded part protruded from the one of the edges is a sensing face of the magnetic sensor element, a tip end face of the protruded part protruded from the other of the edges is a grounding face for being contacted with an electrical conduction member for grounding, and the stepped part is formed on a side face of at least one of the protruded part where the sensing face is formed and the protruded part where the grounding face is formed. ### Claim 19 (depends on 18) The magnetic sensor device according to claim 18, wherein the protruded part which structures the sensing face of the magnetic sensor element comprises a center protruded part and a first protruded part and a second protruded part which are disposed on both sides with respect to the center protruded part, the center protruded part, the first protruded part and the second protruded part are protruded in the same direction from the body part and are extended in a straight shape so as to be parallel to each other, a width dimension in a direction, which is perpendicular to a protruding direction from the body part, of a portion extended in a straight shape of the center protruded part on a tip end side with respect to the stepped part is thinner than a portion extended in a straight shape of the center protruded part on a body part side with respect to the stepped part, and the protruded part which is protruded from the other of the edges comprises a center protruded part and a first protruded part and a second protruded part which are disposed on both sides with respect to the center protruded part, the center protruded part, the first protruded part and the second protruded part being protruded in the same direction from the body part and, the center protruded part, the first protruded part and the second protruded part being extended in a straight shape so as to be parallel to each other, ### Claim 20 (depends on 19) The magnetic sensor device according to claim 19, wherein the exciting coil is wound around the body part, and the detection coil is wound around a thinner portion disposed on a tip end side with respect to the stepped part of the center protruded part which structures the sensing face of the magnetic sensor element. ### Claim 21 (depends on 20) The magnetic sensor device according to claim 20, wherein the exciting coil is wound around the body part at two positions on both sides with respect to the two center protruded parts, and one of the exciting coils is disposed on an inner side with respect to the two first protruded parts and the other of the exciting coils is disposed on an inner side with respect to the two second protruded parts. ### Claim 22 (depends on 21) The magnetic sensor device according to claim 21, wherein the magnetic sensor element comprises a core body having a three layer structure which is comprised of a first and a second protection plates made of nonmagnetic material and the sensor core which is sandwiched by the first and the second protection plates, and the exciting coil and the detection coil are respectively wound around the core body through a coil bobbin. ### Claim 23 (depends on 1) The magnetic sensor device according to claim 1, wherein the sensor core is provided with a plurality of protruded parts which are protruded to the same side from the body part, the stepped part is formed at least one of side faces of two adjacent protruded parts facing each other, and a width of a gap between the side faces at a position on a tip end side with respect to the stepped part is wider than a width of a gap between the side faces at a position on a body part side with respect to the stepped part. ### Claim 24 (depends on 23) The magnetic sensor device according to claim 23, wherein the sensor core is formed with at least three protruded parts juxtaposed in one row so as to be protruded to the same side from the body part, the protruded part disposed at a center position is formed with a stepped part on both side faces which face the adjacent protruded parts disposed on both sides, widths of gaps between the protruded part disposed at the center position and the adjacent protruded parts disposed on the both sides are wider at a position on a tip end side with respect to the stepped part than widths of the gaps at a position on the body part side with respect to the stepped part. ### Claim 25 (depends on 24) The magnetic sensor device according to claim 24, wherein the tip end face of the protruded part is a cutting worked face which is formed by cutting the sensor core or a grinding worked face which is formed by grinding the sensor core.